ci: fix step name

Reviewed-on: #45

.claude/memory/feedback_widget_decomposition.md

@@ -0,0 +1,11 @@
+---
+name: Widget decomposition and provider subscriptions
+description: Prefer splitting screens into multiple focused files/widgets; each widget subscribes to its own relevant providers
+type: feedback
+---
+
+Split screens into multiple smaller widgets across multiple files. Each widget should subscribe only to the providers it needs (`ref.watch` at lowest possible level), rather than having one large screen widget that watches everything and passes data down as parameters.
+
+**Why:** Reduces unnecessary rebuilds; improves readability; each file has one clear responsibility.
+
+**How to apply:** When building a new screen, identify which sub-widgets need their own provider subscriptions and extract them into separate files (e.g., `widgets/grant_card.dart` watches enrichment providers itself, rather than the screen doing it and passing resolved strings down).

.gitignore

@@ -2,3 +2,5 @@ target/
 scripts/__pycache__/
 .DS_Store
 .cargo/config.toml
+.vscode/
+docs/

.vscode/settings.json

@@ -1,2 +0,0 @@
-{
-}

.woodpecker/server-compile.yaml

@@ -0,0 +1,26 @@
+when:
+  - event: pull_request
+    path:
+      include: [".woodpecker/server-*.yaml", "server/**"]
+  - event: push
+    branch: main
+    path:
+      include: [".woodpecker/server-*.yaml", "server/**"]
+
+steps:
+  - name: compile
+    image: jdxcode/mise:latest
+    directory: server
+    environment:
+      CARGO_TERM_COLOR: always
+      CARGO_TARGET_DIR: /usr/local/cargo/target
+      CARGO_HOME: /usr/local/cargo/registry
+    volumes:
+      - cargo-target:/usr/local/cargo/target
+      - cargo-registry:/usr/local/cargo/registry
+    commands:
+      - apt-get update && apt-get install -y pkg-config
+      # Install only the necessary Rust toolchain
+      - mise install rust
+      - mise install protoc
+      - cargo check --all-features

.woodpecker/server-lint.yaml

@@ -22,4 +22,4 @@ steps:
       - apt-get update && apt-get install -y pkg-config
       - mise install rust 
       - mise install protoc
-      - mise exec rust -- cargo clippy --all-targets --all-features -- -D warnings
+      - mise exec rust -- cargo clippy --all -- -D warnings

.woodpecker/useragent-analyze.yaml

@@ -0,0 +1,18 @@
+when:
+  - event: pull_request
+    path:
+      include: ['.woodpecker/useragent-*.yaml', 'useragent/**']
+  - event: push
+    branch: main
+    path:
+      include: ['.woodpecker/useragent-*.yaml', 'useragent/**']
+
+steps:
+  - name: analyze
+    image: jdxcode/mise:latest
+    commands:
+      - mise install flutter 
+      - mise install protoc
+      # Reruns codegen to catch protocol drift
+      - mise codegen 
+      - cd useragent/ && flutter analyze

AGENTS.md

@@ -67,7 +67,7 @@ The server is actor-based using the **kameo** crate. All long-lived state lives
 
 - **`Bootstrapper`** — Manages the one-time bootstrap token written to `~/.arbiter/bootstrap_token` on first run.
 - **`KeyHolder`** — Holds the encrypted root key and manages the Sealed/Unsealed vault state machine. On unseal, decrypts the root key into a `memsafe` hardened memory cell.
-- **`MessageRouter`** — Coordinates streaming messages between user agents and SDK clients.
+- **`FlowCoordinator`** — Coordinates cross-connection flow between user agents and SDK clients.
 - **`EvmActor`** — Handles EVM transaction policy enforcement and signing.
 
 Per-connection actors live under `actors/user_agent/` and `actors/client/`, each with `auth` (challenge-response authentication) and `session` (post-auth operations) sub-modules.

CLAUDE.md

@@ -67,7 +67,7 @@ The server is actor-based using the **kameo** crate. All long-lived state lives
 
 - **`Bootstrapper`** — Manages the one-time bootstrap token written to `~/.arbiter/bootstrap_token` on first run.
 - **`KeyHolder`** — Holds the encrypted root key and manages the Sealed/Unsealed vault state machine. On unseal, decrypts the root key into a `memsafe` hardened memory cell.
-- **`MessageRouter`** — Coordinates streaming messages between user agents and SDK clients.
+- **`FlowCoordinator`** — Coordinates cross-connection flow between user agents and SDK clients.
 - **`EvmActor`** — Handles EVM transaction policy enforcement and signing.
 
 Per-connection actors live under `actors/user_agent/` and `actors/client/`, each with `auth` (challenge-response authentication) and `session` (post-auth operations) sub-modules.

IMPLEMENTATION.md

@@ -6,6 +6,20 @@ This document covers concrete technology choices and dependencies. For the archi
 
 ## Client Connection Flow
 
+### Authentication Result Semantics
+
+Authentication no longer uses an implicit success-only response shape. Both `client` and `user-agent` return explicit auth status enums over the wire.
+
+- **Client:** `AuthResult` may return `SUCCESS`, `INVALID_KEY`, `INVALID_SIGNATURE`, `APPROVAL_DENIED`, `NO_USER_AGENTS_ONLINE`, or `INTERNAL`
+- **User-agent:** `AuthResult` may return `SUCCESS`, `INVALID_KEY`, `INVALID_SIGNATURE`, `BOOTSTRAP_REQUIRED`, `TOKEN_INVALID`, or `INTERNAL`
+
+This makes transport-level failures and actor/domain-level auth failures distinct:
+
+- **Transport/protocol failures** are surfaced as stream/status errors
+- **Authentication failures** are surfaced as successful protocol responses carrying an explicit auth status
+
+Clients are expected to handle these status codes directly and present the concrete failure reason to the user.
+
 ### New Client Approval
 
 When a client whose public key is not yet in the database connects, all connected user agents are asked to approve the connection. The first agent to respond determines the outcome; remaining requests are cancelled via a watch channel.
@@ -53,7 +67,18 @@ The `program_client.nonce` column stores the **next usable nonce** — i.e. it i
 ## Cryptography
 
 ### Authentication
-- **Signature scheme:** ed25519
+- **Client protocol:** ed25519
+
+### User-Agent Authentication
+
+User-agent authentication supports multiple signature schemes because platform-provided "hardware-bound" keys do not expose a uniform algorithm across operating systems and hardware.
+
+- **Supported schemes:** RSA, Ed25519, ECDSA (secp256k1)
+- **Why:** the user agent authenticates with keys backed by platform facilities, and those facilities differ by platform
+- **Apple Silicon Secure Enclave / Secure Element:** ECDSA-only in practice
+- **Windows Hello / TPM 2.0:** currently RSA-backed in our integration
+
+This is why the user-agent auth protocol carries an explicit `KeyType`, while the SDK client protocol remains fixed to ed25519.
 
 ### Encryption at Rest
 - **Scheme:** Symmetric AEAD — currently **XChaCha20-Poly1305**
@@ -68,9 +93,21 @@ The `program_client.nonce` column stores the **next usable nonce** — i.e. it i
 ## Communication
 
 - **Protocol:** gRPC with Protocol Buffers
+- **Request/response matching:** multiplexed over a single bidirectional stream using per-connection request IDs
 - **Server identity distribution:** `ServerInfo` protobuf struct containing the TLS public key fingerprint
 - **Future consideration:** grpc-web lacks bidirectional stream support, so a browser-based wallet may require protojson over WebSocket
 
+### Request Multiplexing
+
+Both `client` and `user-agent` connections support multiple in-flight requests over one gRPC bidi stream.
+
+- Every request carries a monotonically increasing request ID
+- Every normal response echoes the request ID it corresponds to
+- Out-of-band server messages omit the response ID entirely
+- The server rejects already-seen request IDs at the transport adapter boundary before business logic sees the message
+
+This keeps request correlation entirely in transport/client connection code while leaving actor and domain handlers unaware of request IDs.
+
 ---
 
 ## EVM Policy Engine
@@ -122,7 +159,7 @@ The central abstraction is the `Policy` trait. Each implementation handles one s
 Every grant has two layers:
 
 - **Shared (`evm_basic_grant`)** — wallet, chain, validity period, gas fee caps, transaction count rate limit. One row per grant regardless of type.
-- **Specific** — policy-owned tables (`evm_ether_transfer_grant`, `evm_token_transfer_grant`, etc.) holding type-specific configuration.
+- **Specific** — policy-owned tables (`evm_ether_transfer_grant`, `evm_token_transfer_grant`) holding type-specific configuration.
 
 `find_all_grants` uses a `#[diesel::auto_type]` base join between the specific and shared tables, then batch-loads related rows (targets, volume limits) in two additional queries to avoid N+1.
 
@@ -145,7 +182,6 @@ These are checked centrally in `check_shared_constraints` before policy evaluati
 - **Only EIP-1559 transactions are supported.** Legacy and EIP-2930 types are rejected outright.
 - **No opaque-calldata (unknown contract) grant type.** The architecture describes a category for unrecognised contracts, but no policy implements it yet. Any transaction that is not a plain ETH transfer or a known ERC-20 transfer is unconditionally rejected.
 - **Token registry is static.** Tokens are recognised only if they appear in the hard-coded `arbiter_tokens_registry` crate. There is no mechanism to register additional contracts at runtime.
-- **Nonce management is not implemented.** The architecture lists nonce deduplication as a core responsibility, but no nonce tracking or enforcement exists yet.
 
 ---
 
@@ -153,5 +189,5 @@ These are checked centrally in `check_shared_constraints` before policy evaluati
 
 The unsealed root key must be held in a hardened memory cell resistant to dumps, page swaps, and hibernation.
 
-- **Current:** Using the `memsafe` crate as an interim solution
-- **Planned:** Custom implementation based on `mlock` (Unix) and `VirtualProtect` (Windows)
+- **Current:** A dedicated memory-protection abstraction is in place, with `memsafe` used behind that abstraction today
+- **Planned:** Additional backends can be introduced behind the same abstraction, including a custom implementation based on `mlock` (Unix) and `VirtualProtect` (Windows)

mise.lock

@@ -1,19 +1,44 @@
+# @generated - this file is auto-generated by `mise lock` https://mise.jdx.dev/dev-tools/mise-lock.html
+
 [[tools.ast-grep]]
 version = "0.42.0"
 backend = "aqua:ast-grep/ast-grep"
-"platforms.linux-arm64" = { checksum = "sha256:5c830eae8456569e2f7212434ed9c238f58dca412d76045418ed6d394a755836", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-aarch64-unknown-linux-gnu.zip"}
-"platforms.linux-x64" = { checksum = "sha256:e825a05603f0bcc4cd9076c4cc8c9abd6d008b7cd07d9aa3cc323ba4b8606651", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-unknown-linux-gnu.zip"}
-"platforms.macos-arm64" = { checksum = "sha256:fc300d5293b1c770a5aece03a8a193b92e71e87cec726c28096990691a582620", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-aarch64-apple-darwin.zip"}
-"platforms.macos-x64" = { checksum = "sha256:979ffe611327056f4730a1ae71b0209b3b830f58b22c6ed194cda34f55400db2", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-apple-darwin.zip"}
-"platforms.windows-x64" = { checksum = "sha256:55836fa1b2c65dc7d61615a4d9368622a0d2371a76d28b9a165e5a3ab6ae32a4", url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-pc-windows-msvc.zip"}
+
+[tools.ast-grep."platforms.linux-arm64"]
+checksum = "sha256:5c830eae8456569e2f7212434ed9c238f58dca412d76045418ed6d394a755836"
+url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-aarch64-unknown-linux-gnu.zip"
+
+[tools.ast-grep."platforms.linux-arm64-musl"]
+checksum = "sha256:5c830eae8456569e2f7212434ed9c238f58dca412d76045418ed6d394a755836"
+url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-aarch64-unknown-linux-gnu.zip"
+
+[tools.ast-grep."platforms.linux-x64"]
+checksum = "sha256:e825a05603f0bcc4cd9076c4cc8c9abd6d008b7cd07d9aa3cc323ba4b8606651"
+url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-unknown-linux-gnu.zip"
+
+[tools.ast-grep."platforms.linux-x64-musl"]
+checksum = "sha256:e825a05603f0bcc4cd9076c4cc8c9abd6d008b7cd07d9aa3cc323ba4b8606651"
+url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-unknown-linux-gnu.zip"
+
+[tools.ast-grep."platforms.macos-arm64"]
+checksum = "sha256:fc300d5293b1c770a5aece03a8a193b92e71e87cec726c28096990691a582620"
+url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-aarch64-apple-darwin.zip"
+
+[tools.ast-grep."platforms.macos-x64"]
+checksum = "sha256:979ffe611327056f4730a1ae71b0209b3b830f58b22c6ed194cda34f55400db2"
+url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-apple-darwin.zip"
+
+[tools.ast-grep."platforms.windows-x64"]
+checksum = "sha256:55836fa1b2c65dc7d61615a4d9368622a0d2371a76d28b9a165e5a3ab6ae32a4"
+url = "https://github.com/ast-grep/ast-grep/releases/download/0.42.0/app-x86_64-pc-windows-msvc.zip"
 
 [[tools."cargo:cargo-audit"]]
 version = "0.22.1"
 backend = "cargo:cargo-audit"
 
-[[tools."cargo:cargo-features"]]
-version = "1.0.0"
-backend = "cargo:cargo-features"
+[[tools."cargo:cargo-edit"]]
+version = "0.13.9"
+backend = "cargo:cargo-edit"
 
 [[tools."cargo:cargo-features-manager"]]
 version = "0.11.1"
@@ -28,21 +53,13 @@ version = "0.9.126"
 backend = "cargo:cargo-nextest"
 
 [[tools."cargo:cargo-shear"]]
-version = "1.9.1"
+version = "1.11.2"
 backend = "cargo:cargo-shear"
 
 [[tools."cargo:cargo-vet"]]
 version = "0.10.2"
 backend = "cargo:cargo-vet"
 
-[[tools."cargo:diesel-cli"]]
-version = "2.3.6"
-backend = "cargo:diesel-cli"
-
-[tools."cargo:diesel-cli".options]
-default-features = "false"
-features = "sqlite,sqlite-bundled"
-
 [[tools."cargo:diesel_cli"]]
 version = "2.3.6"
 backend = "cargo:diesel_cli"
@@ -51,10 +68,6 @@ backend = "cargo:diesel_cli"
 default-features = "false"
 features = "sqlite,sqlite-bundled"
 
-[[tools."cargo:rinf_cli"]]
-version = "8.9.1"
-backend = "cargo:rinf_cli"
-
 [[tools.flutter]]
 version = "3.38.9-stable"
 backend = "asdf:flutter"
@@ -62,20 +75,66 @@ backend = "asdf:flutter"
 [[tools.protoc]]
 version = "29.6"
 backend = "aqua:protocolbuffers/protobuf/protoc"
-"platforms.linux-arm64" = { checksum = "sha256:2594ff4fcae8cb57310d394d0961b236190ad9c5efbfdf1f597ea471d424fe79", url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-linux-aarch_64.zip"}
-"platforms.linux-x64" = { checksum = "sha256:48785a926e73ffa3f68e2f22b14e7b849620c7a1d36809ac9249a5495e280323", url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-linux-x86_64.zip"}
-"platforms.macos-arm64" = { checksum = "sha256:b9576b5fa1a1ef3fe13a8c91d9d8204b46545759bea5ae155cd6ba2ea4cdaeed", url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-osx-aarch_64.zip"}
-"platforms.macos-x64" = { checksum = "sha256:312f04713946921cc0187ef34df80241ddca1bab6f564c636885fd2cc90d3f88", url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-osx-x86_64.zip"}
-"platforms.windows-x64" = { checksum = "sha256:1ebd7c87baffb9f1c47169b640872bf5fb1e4408079c691af527be9561d8f6f7", url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-win64.zip"}
+
+[tools.protoc."platforms.linux-arm64"]
+checksum = "sha256:2594ff4fcae8cb57310d394d0961b236190ad9c5efbfdf1f597ea471d424fe79"
+url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-linux-aarch_64.zip"
+
+[tools.protoc."platforms.linux-arm64-musl"]
+checksum = "sha256:2594ff4fcae8cb57310d394d0961b236190ad9c5efbfdf1f597ea471d424fe79"
+url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-linux-aarch_64.zip"
+
+[tools.protoc."platforms.linux-x64"]
+checksum = "sha256:48785a926e73ffa3f68e2f22b14e7b849620c7a1d36809ac9249a5495e280323"
+url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-linux-x86_64.zip"
+
+[tools.protoc."platforms.linux-x64-musl"]
+checksum = "sha256:48785a926e73ffa3f68e2f22b14e7b849620c7a1d36809ac9249a5495e280323"
+url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-linux-x86_64.zip"
+
+[tools.protoc."platforms.macos-arm64"]
+checksum = "sha256:b9576b5fa1a1ef3fe13a8c91d9d8204b46545759bea5ae155cd6ba2ea4cdaeed"
+url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-osx-aarch_64.zip"
+
+[tools.protoc."platforms.macos-x64"]
+checksum = "sha256:312f04713946921cc0187ef34df80241ddca1bab6f564c636885fd2cc90d3f88"
+url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-osx-x86_64.zip"
+
+[tools.protoc."platforms.windows-x64"]
+checksum = "sha256:1ebd7c87baffb9f1c47169b640872bf5fb1e4408079c691af527be9561d8f6f7"
+url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.6/protoc-29.6-win64.zip"
 
 [[tools.python]]
 version = "3.14.3"
 backend = "core:python"
-"platforms.linux-arm64" = { checksum = "sha256:be0f4dc2932f762292b27d46ea7d3e8e66ddf3969a5eb0254a229015ed402625", url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260303/cpython-3.14.3+20260303-aarch64-unknown-linux-gnu-install_only_stripped.tar.gz"}
-"platforms.linux-x64" = { checksum = "sha256:0a73413f89efd417871876c9accaab28a9d1e3cd6358fbfff171a38ec99302f0", url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260303/cpython-3.14.3+20260303-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz"}
-"platforms.macos-arm64" = { checksum = "sha256:4703cdf18b26798fde7b49b6b66149674c25f97127be6a10dbcf29309bdcdcdb", url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260303/cpython-3.14.3+20260303-aarch64-apple-darwin-install_only_stripped.tar.gz"}
-"platforms.macos-x64" = { checksum = "sha256:76f1cc26e3d262eae8ca546a93e8bded10cf0323613f7e246fea2e10a8115eb7", url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260303/cpython-3.14.3+20260303-x86_64-apple-darwin-install_only_stripped.tar.gz"}
-"platforms.windows-x64" = { checksum = "sha256:950c5f21a015c1bdd1337f233456df2470fab71e4d794407d27a84cb8b9909a0", url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260303/cpython-3.14.3+20260303-x86_64-pc-windows-msvc-install_only_stripped.tar.gz"}
+
+[tools.python."platforms.linux-arm64"]
+checksum = "sha256:53700338695e402a1a1fe22be4a41fbdacc70e22bb308a48eca8ed67cb7992be"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260324/cpython-3.14.3+20260324-aarch64-unknown-linux-gnu-install_only_stripped.tar.gz"
+
+[tools.python."platforms.linux-arm64-musl"]
+checksum = "sha256:53700338695e402a1a1fe22be4a41fbdacc70e22bb308a48eca8ed67cb7992be"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260324/cpython-3.14.3+20260324-aarch64-unknown-linux-gnu-install_only_stripped.tar.gz"
+
+[tools.python."platforms.linux-x64"]
+checksum = "sha256:d7a9f970914bb4c88756fe3bdcc186d4feb90e9500e54f1db47dae4dc9687e39"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260324/cpython-3.14.3+20260324-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz"
+
+[tools.python."platforms.linux-x64-musl"]
+checksum = "sha256:d7a9f970914bb4c88756fe3bdcc186d4feb90e9500e54f1db47dae4dc9687e39"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260324/cpython-3.14.3+20260324-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz"
+
+[tools.python."platforms.macos-arm64"]
+checksum = "sha256:c43aecde4a663aebff99b9b83da0efec506479f1c3f98331442f33d2c43501f9"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260324/cpython-3.14.3+20260324-aarch64-apple-darwin-install_only_stripped.tar.gz"
+
+[tools.python."platforms.macos-x64"]
+checksum = "sha256:9ab41dbc2f100a2a45d1833b9c11165f51051c558b5213eda9a9731d5948a0c0"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260324/cpython-3.14.3+20260324-x86_64-apple-darwin-install_only_stripped.tar.gz"
+
+[tools.python."platforms.windows-x64"]
+checksum = "sha256:bbe19034b35b0267176a7442575ae7dc6343480fd4d35598cb7700173d431e09"
+url = "https://github.com/astral-sh/python-build-standalone/releases/download/20260324/cpython-3.14.3+20260324-x86_64-pc-windows-msvc-install_only_stripped.tar.gz"
 
 [[tools.rust]]
 version = "1.93.0"

mise.toml

@@ -11,11 +11,12 @@ protoc = "29.6"
 "cargo:cargo-insta" = "1.46.3"
 python = "3.14.3"
 ast-grep = "0.42.0"
+"cargo:cargo-edit" = "0.13.9"
 
 [tasks.codegen]
-sources = ['protobufs/*.proto']
-outputs = ['useragent/lib/proto/*']
+sources = ['protobufs/*.proto', 'protobufs/**/*.proto']
+outputs = ['useragent/lib/proto/**']
 run = '''
 dart pub global activate protoc_plugin && \
-protoc --dart_out=grpc:useragent/lib/proto --proto_path=protobufs/ protobufs/*.proto
+protoc --dart_out=grpc:useragent/lib/proto --proto_path=protobufs/ $(find protobufs -name '*.proto' | sort)
 '''

protobufs/client.proto

@@ -2,45 +2,24 @@ syntax = "proto3";
 
 package arbiter.client;
 
-import "evm.proto";
-
-message AuthChallengeRequest {
-  bytes pubkey = 1;
-}
-
-message AuthChallenge {
-  bytes pubkey = 1;
-  int32 nonce = 2;
-}
-
-message AuthChallengeSolution {
-  bytes signature = 1;
-}
-
-message AuthOk {}
+import "client/auth.proto";
+import "client/evm.proto";
+import "client/vault.proto";
 
 message ClientRequest {
+  int32 request_id = 4;
   oneof payload {
-    AuthChallengeRequest auth_challenge_request = 1;
-    AuthChallengeSolution auth_challenge_solution = 2;
+    auth.Request auth = 1;
+    vault.Request vault = 2;
+    evm.Request evm = 3;
   }
 }
 
-message ClientConnectError {
-  enum Code {
-    UNKNOWN = 0;
-    APPROVAL_DENIED = 1;
-    NO_USER_AGENTS_ONLINE = 2;
-  }
-  Code code = 1;
-}
-
 message ClientResponse {
+  optional int32 request_id = 7;
   oneof payload {
-    AuthChallenge auth_challenge = 1;
-    AuthOk auth_ok = 2;
-    ClientConnectError client_connect_error = 5;
-    arbiter.evm.EvmSignTransactionResponse evm_sign_transaction = 3;
-    arbiter.evm.EvmAnalyzeTransactionResponse evm_analyze_transaction = 4;
+    auth.Response auth = 1;
+    vault.Response vault = 2;
+    evm.Response evm = 3;
   }
 }

protobufs/client/auth.proto

@@ -0,0 +1,43 @@
+syntax = "proto3";
+
+package arbiter.client.auth;
+
+import "shared/client.proto";
+
+message AuthChallengeRequest {
+  bytes pubkey = 1;
+  arbiter.shared.ClientInfo client_info = 2;
+}
+
+message AuthChallenge {
+  bytes pubkey = 1;
+  int32 nonce = 2;
+}
+
+message AuthChallengeSolution {
+  bytes signature = 1;
+}
+
+enum AuthResult {
+  AUTH_RESULT_UNSPECIFIED = 0;
+  AUTH_RESULT_SUCCESS = 1;
+  AUTH_RESULT_INVALID_KEY = 2;
+  AUTH_RESULT_INVALID_SIGNATURE = 3;
+  AUTH_RESULT_APPROVAL_DENIED = 4;
+  AUTH_RESULT_NO_USER_AGENTS_ONLINE = 5;
+  AUTH_RESULT_INTERNAL = 6;
+}
+
+message Request {
+  oneof payload {
+    AuthChallengeRequest challenge_request = 1;
+    AuthChallengeSolution challenge_solution = 2;
+  }
+}
+
+message Response {
+  oneof payload {
+    AuthChallenge challenge = 1;
+    AuthResult result = 2;
+  }
+}

protobufs/client/evm.proto

@@ -0,0 +1,19 @@
+syntax = "proto3";
+
+package arbiter.client.evm;
+
+import "evm.proto";
+
+message Request {
+  oneof payload {
+    arbiter.evm.EvmSignTransactionRequest sign_transaction = 1;
+    arbiter.evm.EvmAnalyzeTransactionRequest analyze_transaction = 2;
+  }
+}
+
+message Response {
+  oneof payload {
+    arbiter.evm.EvmSignTransactionResponse sign_transaction = 1;
+    arbiter.evm.EvmAnalyzeTransactionResponse analyze_transaction = 2;
+  }
+}

protobufs/client/vault.proto

@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package arbiter.client.vault;
+
+import "google/protobuf/empty.proto";
+import "shared/vault.proto";
+
+message Request {
+  oneof payload {
+    google.protobuf.Empty query_state = 1;
+  }
+}
+
+message Response {
+  oneof payload {
+    arbiter.shared.VaultState state = 1;
+  }
+}

protobufs/evm.proto

@@ -4,6 +4,7 @@ package arbiter.evm;
 
 import "google/protobuf/empty.proto";
 import "google/protobuf/timestamp.proto";
+import "shared/evm.proto";
 
 enum EvmError {
   EVM_ERROR_UNSPECIFIED = 0;
@@ -12,7 +13,8 @@ enum EvmError {
 }
 
 message WalletEntry {
-  bytes address = 1; // 20-byte Ethereum address
+  int32 id = 1;
+  bytes address = 2; // 20-byte Ethereum address
 }
 
 message WalletList {
@@ -46,7 +48,7 @@ message VolumeRateLimit {
 }
 
 message SharedSettings {
-  int32 wallet_id = 1;
+  int32 wallet_access_id = 1;
   uint64 chain_id = 2;
   optional google.protobuf.Timestamp valid_from = 3;
   optional google.protobuf.Timestamp valid_until = 4;
@@ -73,75 +75,10 @@ message SpecificGrant {
   }
 }
 
-message EtherTransferMeaning {
-  bytes to = 1; // 20-byte Ethereum address
-  bytes value = 2; // U256 as big-endian bytes
-}
-
-message TokenInfo {
-  string symbol = 1;
-  bytes address = 2; // 20-byte Ethereum address
-  uint64 chain_id = 3;
-}
-
-// Mirror of token_transfers::Meaning
-message TokenTransferMeaning {
-  TokenInfo token = 1;
-  bytes to = 2; // 20-byte Ethereum address
-  bytes value = 3; // U256 as big-endian bytes
-}
-
-// Mirror of policies::SpecificMeaning
-message SpecificMeaning {
-  oneof meaning {
-    EtherTransferMeaning ether_transfer = 1;
-    TokenTransferMeaning token_transfer = 2;
-  }
-}
-
-// --- Eval error types ---
-message GasLimitExceededViolation {
-  optional bytes max_gas_fee_per_gas = 1; // U256 as big-endian bytes
-  optional bytes max_priority_fee_per_gas = 2; // U256 as big-endian bytes
-}
-
-message EvalViolation {
-  oneof kind {
-    bytes invalid_target = 1; // 20-byte Ethereum address
-    GasLimitExceededViolation gas_limit_exceeded = 2;
-    google.protobuf.Empty rate_limit_exceeded = 3;
-    google.protobuf.Empty volumetric_limit_exceeded = 4;
-    google.protobuf.Empty invalid_time = 5;
-    google.protobuf.Empty invalid_transaction_type = 6;
-  }
-}
-
-// Transaction was classified but no grant covers it
-message NoMatchingGrantError {
-  SpecificMeaning meaning = 1;
-}
-
-// Transaction was classified and a grant was found, but constraints were violated
-message PolicyViolationsError {
-  SpecificMeaning meaning = 1;
-  repeated EvalViolation violations = 2;
-}
-
-// top-level error returned when transaction evaluation fails
-message TransactionEvalError {
-  oneof kind {
-    google.protobuf.Empty contract_creation_not_supported = 1;
-    google.protobuf.Empty unsupported_transaction_type = 2;
-    NoMatchingGrantError no_matching_grant = 3;
-    PolicyViolationsError policy_violations = 4;
-  }
-}
-
 // --- UserAgent grant management ---
 message EvmGrantCreateRequest {
-  int32 client_id = 1;
-  SharedSettings shared = 2;
-  SpecificGrant specific = 3;
+  SharedSettings shared = 1;
+  SpecificGrant specific = 2;
 }
 
 message EvmGrantCreateResponse {
@@ -165,13 +102,13 @@ message EvmGrantDeleteResponse {
 // Basic grant info returned in grant listings
 message GrantEntry {
   int32 id = 1;
-  int32 client_id = 2;
+  int32 wallet_access_id = 2;
   SharedSettings shared = 3;
   SpecificGrant specific = 4;
 }
 
 message EvmGrantListRequest {
-  optional int32 wallet_id = 1;
+  optional int32 wallet_access_id = 1;
 }
 
 message EvmGrantListResponse {
@@ -197,7 +134,7 @@ message EvmSignTransactionRequest {
 message EvmSignTransactionResponse {
   oneof result {
     bytes signature = 1; // 65-byte signature: r[32] || s[32] || v[1]
-    TransactionEvalError eval_error = 2;
+    arbiter.shared.evm.TransactionEvalError eval_error = 2;
     EvmError error = 3;
   }
 }
@@ -209,8 +146,8 @@ message EvmAnalyzeTransactionRequest {
 
 message EvmAnalyzeTransactionResponse {
   oneof result {
-    SpecificMeaning meaning = 1;
-    TransactionEvalError eval_error = 2;
+    arbiter.shared.evm.SpecificMeaning meaning = 1;
+    arbiter.shared.evm.TransactionEvalError eval_error = 2;
     EvmError error = 3;
   }
 }

protobufs/shared/client.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package arbiter.shared;
+
+message ClientInfo {
+  string name = 1;
+  optional string description = 2;
+  optional string version = 3;
+}

protobufs/shared/evm.proto

@@ -0,0 +1,68 @@
+syntax = "proto3";
+
+package arbiter.shared.evm;
+
+import "google/protobuf/empty.proto";
+
+message EtherTransferMeaning {
+  bytes to = 1; // 20-byte Ethereum address
+  bytes value = 2; // U256 as big-endian bytes
+}
+
+message TokenInfo {
+  string symbol = 1;
+  bytes address = 2; // 20-byte Ethereum address
+  uint64 chain_id = 3;
+}
+
+// Mirror of token_transfers::Meaning
+message TokenTransferMeaning {
+  TokenInfo token = 1;
+  bytes to = 2; // 20-byte Ethereum address
+  bytes value = 3; // U256 as big-endian bytes
+}
+
+// Mirror of policies::SpecificMeaning
+message SpecificMeaning {
+  oneof meaning {
+    EtherTransferMeaning ether_transfer = 1;
+    TokenTransferMeaning token_transfer = 2;
+  }
+}
+
+message GasLimitExceededViolation {
+  optional bytes max_gas_fee_per_gas = 1; // U256 as big-endian bytes
+  optional bytes max_priority_fee_per_gas = 2; // U256 as big-endian bytes
+}
+
+message EvalViolation {
+  oneof kind {
+    bytes invalid_target = 1; // 20-byte Ethereum address
+    GasLimitExceededViolation gas_limit_exceeded = 2;
+    google.protobuf.Empty rate_limit_exceeded = 3;
+    google.protobuf.Empty volumetric_limit_exceeded = 4;
+    google.protobuf.Empty invalid_time = 5;
+    google.protobuf.Empty invalid_transaction_type = 6;
+  }
+}
+
+// Transaction was classified but no grant covers it
+message NoMatchingGrantError {
+  SpecificMeaning meaning = 1;
+}
+
+// Transaction was classified and a grant was found, but constraints were violated
+message PolicyViolationsError {
+  SpecificMeaning meaning = 1;
+  repeated EvalViolation violations = 2;
+}
+
+// top-level error returned when transaction evaluation fails
+message TransactionEvalError {
+  oneof kind {
+    google.protobuf.Empty contract_creation_not_supported = 1;
+    google.protobuf.Empty unsupported_transaction_type = 2;
+    NoMatchingGrantError no_matching_grant = 3;
+    PolicyViolationsError policy_violations = 4;
+  }
+}

protobufs/shared/vault.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package arbiter.shared;
+
+enum VaultState {
+  VAULT_STATE_UNSPECIFIED = 0;
+  VAULT_STATE_UNBOOTSTRAPPED = 1;
+  VAULT_STATE_SEALED = 2;
+  VAULT_STATE_UNSEALED = 3;
+  VAULT_STATE_ERROR = 4;
+}

protobufs/user_agent.proto

@@ -2,114 +2,27 @@ syntax = "proto3";
 
 package arbiter.user_agent;
 
-import "google/protobuf/empty.proto";
-import "evm.proto";
-
-enum KeyType {
-  KEY_TYPE_UNSPECIFIED = 0;
-  KEY_TYPE_ED25519 = 1;
-  KEY_TYPE_ECDSA_SECP256K1 = 2;
-  KEY_TYPE_RSA = 3;
-}
-
-message AuthChallengeRequest {
-  bytes pubkey = 1;
-  optional string bootstrap_token = 2;
-  KeyType key_type = 3;
-}
-
-message AuthChallenge {
-  bytes pubkey = 1;
-  int32 nonce = 2;
-}
-
-message AuthChallengeSolution {
-  bytes signature = 1;
-}
-
-message AuthOk {}
-
-message UnsealStart {
-  bytes client_pubkey = 1;
-}
-
-message UnsealStartResponse {
-  bytes server_pubkey = 1;
-}
-message UnsealEncryptedKey {
-  bytes nonce = 1;
-  bytes ciphertext = 2;
-  bytes associated_data = 3;
-}
-
-message BootstrapEncryptedKey {
-  bytes nonce = 1;
-  bytes ciphertext = 2;
-  bytes associated_data = 3;
-}
-
-enum UnsealResult {
-  UNSEAL_RESULT_UNSPECIFIED = 0;
-  UNSEAL_RESULT_SUCCESS = 1;
-  UNSEAL_RESULT_INVALID_KEY = 2;
-  UNSEAL_RESULT_UNBOOTSTRAPPED = 3;
-}
-
-enum BootstrapResult {
-  BOOTSTRAP_RESULT_UNSPECIFIED = 0;
-  BOOTSTRAP_RESULT_SUCCESS = 1;
-  BOOTSTRAP_RESULT_ALREADY_BOOTSTRAPPED = 2;
-  BOOTSTRAP_RESULT_INVALID_KEY = 3;
-}
-
-enum VaultState {
-  VAULT_STATE_UNSPECIFIED = 0;
-  VAULT_STATE_UNBOOTSTRAPPED = 1;
-  VAULT_STATE_SEALED = 2;
-  VAULT_STATE_UNSEALED = 3;
-  VAULT_STATE_ERROR = 4;
-}
-
-message ClientConnectionRequest {
-  bytes pubkey = 1;
-}
-
-message ClientConnectionResponse {
-  bool approved = 1;
-}
-
-message ClientConnectionCancel {}
+import "user_agent/auth.proto";
+import "user_agent/evm.proto";
+import "user_agent/sdk_client.proto";
+import "user_agent/vault/vault.proto";
 
 message UserAgentRequest {
+  int32 id = 16;
   oneof payload {
-    AuthChallengeRequest auth_challenge_request = 1;
-    AuthChallengeSolution auth_challenge_solution = 2;
-    UnsealStart unseal_start = 3;
-    UnsealEncryptedKey unseal_encrypted_key = 4;
-    google.protobuf.Empty query_vault_state = 5;
-    google.protobuf.Empty evm_wallet_create = 6;
-    google.protobuf.Empty evm_wallet_list = 7;
-    arbiter.evm.EvmGrantCreateRequest evm_grant_create = 8;
-    arbiter.evm.EvmGrantDeleteRequest evm_grant_delete = 9;
-    arbiter.evm.EvmGrantListRequest evm_grant_list = 10;
-    ClientConnectionResponse client_connection_response = 11;
-    BootstrapEncryptedKey bootstrap_encrypted_key = 12;
+    auth.Request auth = 1;
+    vault.Request vault = 2;
+    evm.Request evm = 3;
+    sdk_client.Request sdk_client = 4;
   }
 }
+
 message UserAgentResponse {
+  optional int32 id = 16;
   oneof payload {
-    AuthChallenge auth_challenge = 1;
-    AuthOk auth_ok = 2;
-    UnsealStartResponse unseal_start_response = 3;
-    UnsealResult unseal_result = 4;
-    VaultState vault_state = 5;
-    arbiter.evm.WalletCreateResponse evm_wallet_create = 6;
-    arbiter.evm.WalletListResponse evm_wallet_list = 7;
-    arbiter.evm.EvmGrantCreateResponse evm_grant_create = 8;
-    arbiter.evm.EvmGrantDeleteResponse evm_grant_delete = 9;
-    arbiter.evm.EvmGrantListResponse evm_grant_list = 10;
-    ClientConnectionRequest client_connection_request = 11;
-    ClientConnectionCancel client_connection_cancel = 12;
-    BootstrapResult bootstrap_result = 13;
+    auth.Response auth = 1;
+    vault.Response vault = 2;
+    evm.Response evm = 3;
+    sdk_client.Response sdk_client = 4;
   }
 }

protobufs/user_agent/auth.proto

@@ -0,0 +1,48 @@
+syntax = "proto3";
+
+package arbiter.user_agent.auth;
+
+enum KeyType {
+  KEY_TYPE_UNSPECIFIED = 0;
+  KEY_TYPE_ED25519 = 1;
+  KEY_TYPE_ECDSA_SECP256K1 = 2;
+  KEY_TYPE_RSA = 3;
+}
+
+message AuthChallengeRequest {
+  bytes pubkey = 1;
+  optional string bootstrap_token = 2;
+  KeyType key_type = 3;
+}
+
+message AuthChallenge {
+  int32 nonce = 1;
+}
+
+message AuthChallengeSolution {
+  bytes signature = 1;
+}
+
+enum AuthResult {
+  AUTH_RESULT_UNSPECIFIED = 0;
+  AUTH_RESULT_SUCCESS = 1;
+  AUTH_RESULT_INVALID_KEY = 2;
+  AUTH_RESULT_INVALID_SIGNATURE = 3;
+  AUTH_RESULT_BOOTSTRAP_REQUIRED = 4;
+  AUTH_RESULT_TOKEN_INVALID = 5;
+  AUTH_RESULT_INTERNAL = 6;
+}
+
+message Request {
+  oneof payload {
+    AuthChallengeRequest challenge_request = 1;
+    AuthChallengeSolution challenge_solution = 2;
+  }
+}
+
+message Response {
+  oneof payload {
+    AuthChallenge challenge = 1;
+    AuthResult result = 2;
+  }
+}

protobufs/user_agent/evm.proto

@@ -0,0 +1,33 @@
+syntax = "proto3";
+
+package arbiter.user_agent.evm;
+
+import "evm.proto";
+import "google/protobuf/empty.proto";
+
+message SignTransactionRequest {
+  int32 client_id = 1;
+  arbiter.evm.EvmSignTransactionRequest request = 2;
+}
+
+message Request {
+  oneof payload {
+    google.protobuf.Empty wallet_create = 1;
+    google.protobuf.Empty wallet_list = 2;
+    arbiter.evm.EvmGrantCreateRequest grant_create = 3;
+    arbiter.evm.EvmGrantDeleteRequest grant_delete = 4;
+    arbiter.evm.EvmGrantListRequest grant_list = 5;
+    SignTransactionRequest sign_transaction = 6;
+  }
+}
+
+message Response {
+  oneof payload {
+    arbiter.evm.WalletCreateResponse wallet_create = 1;
+    arbiter.evm.WalletListResponse wallet_list = 2;
+    arbiter.evm.EvmGrantCreateResponse grant_create = 3;
+    arbiter.evm.EvmGrantDeleteResponse grant_delete = 4;
+    arbiter.evm.EvmGrantListResponse grant_list = 5;
+    arbiter.evm.EvmSignTransactionResponse sign_transaction = 6;
+  }
+}

protobufs/user_agent/sdk_client.proto

@@ -0,0 +1,100 @@
+syntax = "proto3";
+
+package arbiter.user_agent.sdk_client;
+
+import "shared/client.proto";
+import "google/protobuf/empty.proto";
+
+enum Error {
+  ERROR_UNSPECIFIED = 0;
+  ERROR_ALREADY_EXISTS = 1;
+  ERROR_NOT_FOUND = 2;
+  ERROR_HAS_RELATED_DATA = 3; // hard-delete blocked by FK (client has grants or transaction logs)
+  ERROR_INTERNAL = 4;
+}
+
+message RevokeRequest {
+  int32 client_id = 1;
+}
+
+message Entry {
+  int32 id = 1;
+  bytes pubkey = 2;
+  arbiter.shared.ClientInfo info = 3;
+  int32 created_at = 4;
+}
+
+message List {
+  repeated Entry clients = 1;
+}
+
+message RevokeResponse {
+  oneof result {
+    google.protobuf.Empty ok = 1;
+    Error error = 2;
+  }
+}
+
+message ListResponse {
+  oneof result {
+    List clients = 1;
+    Error error = 2;
+  }
+}
+
+message ConnectionRequest {
+  bytes pubkey = 1;
+  arbiter.shared.ClientInfo info = 2;
+}
+
+message ConnectionResponse {
+  bool approved = 1;
+  bytes pubkey = 2;
+}
+
+message ConnectionCancel {
+  bytes pubkey = 1;
+}
+
+message WalletAccess {
+  int32 wallet_id = 1;
+  int32 sdk_client_id = 2;
+}
+
+message WalletAccessEntry {
+  int32 id = 1;
+  WalletAccess access = 2;
+}
+
+message GrantWalletAccess {
+  repeated WalletAccess accesses = 1;
+}
+
+message RevokeWalletAccess {
+  repeated int32 accesses = 1;
+}
+
+message ListWalletAccessResponse {
+  repeated WalletAccessEntry accesses = 1;
+}
+
+message Request {
+  oneof payload {
+    ConnectionResponse connection_response = 1;
+    RevokeRequest revoke = 2;
+    google.protobuf.Empty list = 3;
+    GrantWalletAccess grant_wallet_access = 4;
+    RevokeWalletAccess revoke_wallet_access = 5;
+    google.protobuf.Empty list_wallet_access = 6;
+  }
+}
+
+message Response {
+  oneof payload {
+    ConnectionRequest connection_request = 1;
+    ConnectionCancel connection_cancel = 2;
+    RevokeResponse revoke = 3;
+    ListResponse list = 4;
+    ListWalletAccessResponse list_wallet_access = 5;
+  }
+}

protobufs/user_agent/vault/bootstrap.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package arbiter.user_agent.vault.bootstrap;
+
+message BootstrapEncryptedKey {
+  bytes nonce = 1;
+  bytes ciphertext = 2;
+  bytes associated_data = 3;
+}
+
+enum BootstrapResult {
+  BOOTSTRAP_RESULT_UNSPECIFIED = 0;
+  BOOTSTRAP_RESULT_SUCCESS = 1;
+  BOOTSTRAP_RESULT_ALREADY_BOOTSTRAPPED = 2;
+  BOOTSTRAP_RESULT_INVALID_KEY = 3;
+}
+
+message Request {
+  BootstrapEncryptedKey encrypted_key = 2;
+}
+
+message Response {
+  BootstrapResult result = 1;
+}

protobufs/user_agent/vault/unseal.proto

@@ -0,0 +1,37 @@
+syntax = "proto3";
+
+package arbiter.user_agent.vault.unseal;
+
+message UnsealStart {
+  bytes client_pubkey = 1;
+}
+
+message UnsealStartResponse {
+  bytes server_pubkey = 1;
+}
+message UnsealEncryptedKey {
+  bytes nonce = 1;
+  bytes ciphertext = 2;
+  bytes associated_data = 3;
+}
+
+enum UnsealResult {
+  UNSEAL_RESULT_UNSPECIFIED = 0;
+  UNSEAL_RESULT_SUCCESS = 1;
+  UNSEAL_RESULT_INVALID_KEY = 2;
+  UNSEAL_RESULT_UNBOOTSTRAPPED = 3;
+}
+
+message Request {
+  oneof payload {
+    UnsealStart start = 1;
+    UnsealEncryptedKey encrypted_key = 2;
+  }
+}
+
+message Response {
+  oneof payload {
+    UnsealStartResponse start = 1;
+    UnsealResult result = 2;
+  }
+}

protobufs/user_agent/vault/vault.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package arbiter.user_agent.vault;
+
+import "google/protobuf/empty.proto";
+import "shared/vault.proto";
+import "user_agent/vault/bootstrap.proto";
+import "user_agent/vault/unseal.proto";
+
+message Request {
+  oneof payload {
+    google.protobuf.Empty query_state = 1;
+    unseal.Request unseal = 2;
+    bootstrap.Request bootstrap = 3;
+  }
+}
+
+message Response {
+  oneof payload {
+    arbiter.shared.VaultState state = 1;
+    unseal.Response unseal = 2;
+    bootstrap.Response bootstrap = 3;
+  }
+}

server/Cargo.lock

@@ -67,13 +67,13 @@ dependencies = [
 
 [[package]]
 name = "alloy-chains"
-version = "0.2.31"
+version = "0.2.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d9d22005bf31b018f31ef9ecadb5d2c39cf4f6acc8db0456f72c815f3d7f757"
+checksum = "9247f0a399ef71aeb68f497b2b8fb348014f742b50d3b83b1e00dfe1b7d64b3d"
 dependencies = [
  "alloy-primitives",
  "num_enum",
- "strum",
+ "strum 0.27.2",
 ]
 
 [[package]]
@@ -100,7 +100,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_with",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -136,7 +136,7 @@ dependencies = [
  "futures",
  "futures-util",
  "serde_json",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -165,7 +165,7 @@ dependencies = [
  "itoa",
  "serde",
  "serde_json",
- "winnow",
+ "winnow 0.7.15",
 ]
 
 [[package]]
@@ -178,7 +178,7 @@ dependencies = [
  "alloy-rlp",
  "crc",
  "serde",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -203,7 +203,7 @@ dependencies = [
  "alloy-rlp",
  "borsh",
  "serde",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -239,7 +239,7 @@ dependencies = [
  "serde",
  "serde_with",
  "sha2 0.10.9",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -280,7 +280,7 @@ dependencies = [
  "http",
  "serde",
  "serde_json",
- "thiserror",
+ "thiserror 2.0.18",
  "tracing",
 ]
 
@@ -307,7 +307,7 @@ dependencies = [
  "futures-utils-wasm",
  "serde",
  "serde_json",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -382,7 +382,7 @@ dependencies = [
  "reqwest",
  "serde",
  "serde_json",
- "thiserror",
+ "thiserror 2.0.18",
  "tokio",
  "tracing",
  "url",
@@ -471,11 +471,11 @@ dependencies = [
  "alloy-rlp",
  "alloy-serde",
  "alloy-sol-types",
- "itertools 0.14.0",
+ "itertools 0.13.0",
  "serde",
  "serde_json",
  "serde_with",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -501,7 +501,7 @@ dependencies = [
  "either",
  "elliptic-curve",
  "k256",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -517,7 +517,7 @@ dependencies = [
  "async-trait",
  "k256",
  "rand 0.8.5",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -578,7 +578,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a6df77fea9d6a2a75c0ef8d2acbdfd92286cc599983d3175ccdc170d3433d249"
 dependencies = [
  "serde",
- "winnow",
+ "winnow 0.7.15",
 ]
 
 [[package]]
@@ -608,7 +608,7 @@ dependencies = [
  "parking_lot",
  "serde",
  "serde_json",
- "thiserror",
+ "thiserror 2.0.18",
  "tokio",
  "tower",
  "tracing",
@@ -624,7 +624,7 @@ checksum = "aa501ad58dd20acddbfebc65b52e60f05ebf97c52fa40d1b35e91f5e2da0ad0e"
 dependencies = [
  "alloy-json-rpc",
  "alloy-transport",
- "itertools 0.14.0",
+ "itertools 0.13.0",
  "reqwest",
  "serde_json",
  "tower",
@@ -644,7 +644,7 @@ dependencies = [
  "nybbles",
  "serde",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.18",
  "tracing",
 ]
 
@@ -678,6 +678,19 @@ checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
 [[package]]
 name = "arbiter-client"
 version = "0.1.0"
+dependencies = [
+ "alloy",
+ "arbiter-proto",
+ "async-trait",
+ "ed25519-dalek",
+ "http",
+ "rand 0.10.0",
+ "rustls-webpki",
+ "thiserror 2.0.18",
+ "tokio",
+ "tokio-stream",
+ "tonic",
+]
 
 [[package]]
 name = "arbiter-proto"
@@ -691,12 +704,14 @@ dependencies = [
  "miette",
  "prost",
  "prost-types",
+ "protoc-bin-vendored",
  "rand 0.10.0",
  "rcgen",
  "rstest",
  "rustls-pki-types",
- "thiserror",
+ "thiserror 2.0.18",
  "tokio",
+ "tokio-stream",
  "tonic",
  "tonic-prost",
  "tonic-prost-build",
@@ -720,6 +735,7 @@ dependencies = [
  "diesel-async",
  "diesel_migrations",
  "ed25519-dalek",
+ "fatality",
  "futures",
  "insta",
  "k256",
@@ -737,9 +753,9 @@ dependencies = [
  "sha2 0.10.9",
  "smlang",
  "spki",
- "strum",
+ "strum 0.28.0",
  "test-log",
- "thiserror",
+ "thiserror 2.0.18",
  "tokio",
  "tokio-stream",
  "tonic",
@@ -976,7 +992,7 @@ dependencies = [
  "nom",
  "num-traits",
  "rusticata-macros",
- "thiserror",
+ "thiserror 2.0.18",
  "time",
 ]
 
@@ -1061,9 +1077,9 @@ checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
 
 [[package]]
 name = "aws-lc-rs"
-version = "1.16.1"
+version = "1.16.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94bffc006df10ac2a68c83692d734a465f8ee6c5b384d8545a636f81d858f4bf"
+checksum = "a054912289d18629dc78375ba2c3726a3afe3ff71b4edba9dedfca0e3446d1fc"
 dependencies = [
  "aws-lc-sys",
  "untrusted 0.7.1",
@@ -1072,9 +1088,9 @@ dependencies = [
 
 [[package]]
 name = "aws-lc-sys"
-version = "0.38.0"
+version = "0.39.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4321e568ed89bb5a7d291a7f37997c2c0df89809d7b6d12062c81ddb54aa782e"
+checksum = "1fa7e52a4c5c547c741610a2c6f123f3881e409b714cd27e6798ef020c514f0a"
 dependencies = [
  "cc",
  "cmake",
@@ -1269,19 +1285,20 @@ dependencies = [
 
 [[package]]
 name = "borsh"
-version = "1.6.0"
+version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1da5ab77c1437701eeff7c88d968729e7766172279eab0676857b3d63af7a6f"
+checksum = "cfd1e3f8955a5d7de9fab72fc8373fade9fb8a703968cb200ae3dc6cf08e185a"
 dependencies = [
  "borsh-derive",
+ "bytes",
  "cfg_aliases",
 ]
 
 [[package]]
 name = "borsh-derive"
-version = "1.6.0"
+version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0686c856aa6aac0c4498f936d7d6a02df690f614c03e4d906d1018062b5c5e2c"
+checksum = "bfcfdc083699101d5a7965e49925975f2f55060f94f9a05e7187be95d530ca59"
 dependencies = [
  "once_cell",
  "proc-macro-crate",
@@ -1795,15 +1812,16 @@ dependencies = [
 
 [[package]]
 name = "diesel-async"
-version = "0.7.4"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13096fb8dae53f2d411c4b523bec85f45552ed3044a2ab4d85fb2092d9cb4f34"
+checksum = "b95864e58597509106f1fddfe0600de7e589e1fddddd87f54eee0a49fd111bbc"
 dependencies = [
  "bb8",
  "diesel",
  "diesel_migrations",
  "futures-core",
  "futures-util",
+ "pin-project-lite",
  "scoped-futures",
  "tokio",
 ]
@@ -2033,7 +2051,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "expander"
+version = "2.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2c470c71d91ecbd179935b24170459e926382eaaa86b590b78814e180d8a8e2"
+dependencies = [
+ "blake2",
+ "file-guard",
+ "fs-err",
+ "prettyplease",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
 ]
 
 [[package]]
@@ -2064,6 +2097,30 @@ dependencies = [
  "bytes",
 ]
 
+[[package]]
+name = "fatality"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec6f82451ff7f0568c6181287189126d492b5654e30a788add08027b6363d019"
+dependencies = [
+ "fatality-proc-macro",
+ "thiserror 1.0.69",
+]
+
+[[package]]
+name = "fatality-proc-macro"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb42427514b063d97ce21d5199f36c0c307d981434a6be32582bc79fe5bd2303"
+dependencies = [
+ "expander",
+ "indexmap 2.13.0",
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "ff"
 version = "0.13.1"
@@ -2086,6 +2143,16 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "64cd1e32ddd350061ae6edb1b082d7c54915b5c672c389143b9a63403a109f24"
 
+[[package]]
+name = "file-guard"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21ef72acf95ec3d7dbf61275be556299490a245f017cf084bd23b4f68cf9407c"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.9"
@@ -2147,6 +2214,15 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "fs-err"
+version = "2.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88a41f105fe1d5b6b34b2055e3dc59bb79b46b48b2040b9e6c7b4b5de097aa41"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "fs_extra"
 version = "1.3.0"
@@ -2795,20 +2871,11 @@ dependencies = [
  "either",
 ]
 
-[[package]]
-name = "itertools"
-version = "0.14.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
-dependencies = [
- "either",
-]
-
 [[package]]
 name = "itoa"
-version = "1.0.17"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92ecc6618181def0457392ccd0ee51198e065e016d1d527a7ac1b6dc7c1f09d2"
+checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
 
 [[package]]
 name = "jobserver"
@@ -3119,7 +3186,7 @@ version = "0.50.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5"
 dependencies = [
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -3196,9 +3263,9 @@ dependencies = [
 
 [[package]]
 name = "num_enum"
-version = "0.7.5"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1207a7e20ad57b847bbddc6776b968420d38292bbfe2089accff5e19e82454c"
+checksum = "5d0bca838442ec211fa11de3a8b0e0e8f3a4522575b5c4c06ed722e005036f26"
 dependencies = [
  "num_enum_derive",
  "rustversion",
@@ -3206,9 +3273,9 @@ dependencies = [
 
 [[package]]
 name = "num_enum_derive"
-version = "0.7.5"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff32365de1b6743cb203b710788263c44a03de03802daf96092f2da4fe6ba4d7"
+checksum = "680998035259dcfcafe653688bf2aa6d3e2dc05e98be6ab46afb089dc84f1df8"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -3600,7 +3667,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "343d3bd7056eda839b03204e68deff7d1b13aba7af2b2fd16890697274262ee7"
 dependencies = [
  "heck",
- "itertools 0.14.0",
+ "itertools 0.13.0",
  "log",
  "multimap",
  "petgraph",
@@ -3621,7 +3688,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "27c6023962132f4b30eb4c172c91ce92d933da334c59c23cddee82358ddafb0b"
 dependencies = [
  "anyhow",
- "itertools 0.14.0",
+ "itertools 0.13.0",
  "proc-macro2",
  "quote",
  "syn 2.0.117",
@@ -3638,10 +3705,74 @@ dependencies = [
 ]
 
 [[package]]
-name = "pulldown-cmark"
-version = "0.13.1"
+name = "protoc-bin-vendored"
+version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83c41efbf8f90ac44de7f3a868f0867851d261b56291732d0cbf7cceaaeb55a6"
+checksum = "d1c381df33c98266b5f08186583660090a4ffa0889e76c7e9a5e175f645a67fa"
+dependencies = [
+ "protoc-bin-vendored-linux-aarch_64",
+ "protoc-bin-vendored-linux-ppcle_64",
+ "protoc-bin-vendored-linux-s390_64",
+ "protoc-bin-vendored-linux-x86_32",
+ "protoc-bin-vendored-linux-x86_64",
+ "protoc-bin-vendored-macos-aarch_64",
+ "protoc-bin-vendored-macos-x86_64",
+ "protoc-bin-vendored-win32",
+]
+
+[[package]]
+name = "protoc-bin-vendored-linux-aarch_64"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c350df4d49b5b9e3ca79f7e646fde2377b199e13cfa87320308397e1f37e1a4c"
+
+[[package]]
+name = "protoc-bin-vendored-linux-ppcle_64"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a55a63e6c7244f19b5c6393f025017eb5d793fd5467823a099740a7a4222440c"
+
+[[package]]
+name = "protoc-bin-vendored-linux-s390_64"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1dba5565db4288e935d5330a07c264a4ee8e4a5b4a4e6f4e83fad824cc32f3b0"
+
+[[package]]
+name = "protoc-bin-vendored-linux-x86_32"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8854774b24ee28b7868cd71dccaae8e02a2365e67a4a87a6cd11ee6cdbdf9cf5"
+
+[[package]]
+name = "protoc-bin-vendored-linux-x86_64"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b38b07546580df720fa464ce124c4b03630a6fb83e05c336fea2a241df7e5d78"
+
+[[package]]
+name = "protoc-bin-vendored-macos-aarch_64"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89278a9926ce312e51f1d999fee8825d324d603213344a9a706daa009f1d8092"
+
+[[package]]
+name = "protoc-bin-vendored-macos-x86_64"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81745feda7ccfb9471d7a4de888f0652e806d5795b61480605d4943176299756"
+
+[[package]]
+name = "protoc-bin-vendored-win32"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95067976aca6421a523e491fce939a3e65249bac4b977adee0ee9771568e8aa3"
+
+[[package]]
+name = "pulldown-cmark"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14104c5a24d9bcf7eb2c24753e0f49fe14555d8bd565ea3d38e4b4303267259d"
 dependencies = [
  "bitflags",
  "memchr",
@@ -3677,7 +3808,7 @@ dependencies = [
  "rustc-hash",
  "rustls",
  "socket2",
- "thiserror",
+ "thiserror 2.0.18",
  "tokio",
  "tracing",
  "web-time",
@@ -3698,7 +3829,7 @@ dependencies = [
  "rustls",
  "rustls-pki-types",
  "slab",
- "thiserror",
+ "thiserror 2.0.18",
  "tinyvec",
  "tracing",
  "web-time",
@@ -4033,7 +4164,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8a1f2315036ef6b1fbacd1972e8ee7688030b0a2121edfc2a6550febd41574d"
 dependencies = [
  "hashbrown 0.16.1",
- "thiserror",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -4154,7 +4285,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -4185,9 +4316,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-webpki"
-version = "0.103.9"
+version = "0.103.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7df23109aa6c1567d1c575b9952556388da57401e4ace1d15f79eedad0d8f53"
+checksum = "df33b2b81ac578cabaf06b89b0631153a3f416b0a886e8a7a1707fb51abbd1ef"
 dependencies = [
  "aws-lc-rs",
  "ring",
@@ -4570,7 +4701,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3a766e1110788c36f4fa1c2b71b387a7815aa65f88ce0229841826633d93723e"
 dependencies = [
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -4631,7 +4762,16 @@ version = "0.27.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "af23d6f6c1a224baef9d3f61e287d2761385a5b88fdab4eb4c6f11aeb54c4bcf"
 dependencies = [
- "strum_macros",
+ "strum_macros 0.27.2",
+]
+
+[[package]]
+name = "strum"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9628de9b8791db39ceda2b119bbe13134770b56c138ec1d3af810d045c04f9bd"
+dependencies = [
+ "strum_macros 0.28.0",
 ]
 
 [[package]]
@@ -4646,6 +4786,18 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "strum_macros"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab85eea0270ee17587ed4156089e10b9e6880ee688791d45a905f5b1ca36f664"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "subtle"
 version = "2.6.1"
@@ -4743,7 +4895,7 @@ dependencies = [
  "getrandom 0.4.2",
  "once_cell",
  "rustix",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -4787,13 +4939,33 @@ dependencies = [
  "unicode-width 0.2.2",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+dependencies = [
+ "thiserror-impl 1.0.69",
+]
+
 [[package]]
 name = "thiserror"
 version = "2.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4288b5bcbc7920c07a1149a35cf9590a2aa808e0bc1eafaade0b80947865fbc4"
 dependencies = [
- "thiserror-impl",
+ "thiserror-impl 2.0.18",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
 ]
 
 [[package]]
@@ -4955,7 +5127,7 @@ dependencies = [
  "serde_spanned",
  "toml_datetime 0.7.5+spec-1.1.0",
  "toml_parser",
- "winnow",
+ "winnow 0.7.15",
 ]
 
 [[package]]
@@ -4969,32 +5141,32 @@ dependencies = [
 
 [[package]]
 name = "toml_datetime"
-version = "1.0.0+spec-1.1.0"
+version = "1.0.1+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32c2555c699578a4f59f0cc68e5116c8d7cabbd45e1409b989d4be085b53f13e"
+checksum = "9b320e741db58cac564e26c607d3cc1fdc4a88fd36c879568c07856ed83ff3e9"
 dependencies = [
  "serde_core",
 ]
 
 [[package]]
 name = "toml_edit"
-version = "0.25.4+spec-1.1.0"
+version = "0.25.5+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7193cbd0ce53dc966037f54351dbbcf0d5a642c7f0038c382ef9e677ce8c13f2"
+checksum = "8ca1a40644a28bce036923f6a431df0b34236949d111cc07cb6dca830c9ef2e1"
 dependencies = [
  "indexmap 2.13.0",
- "toml_datetime 1.0.0+spec-1.1.0",
+ "toml_datetime 1.0.1+spec-1.1.0",
  "toml_parser",
- "winnow",
+ "winnow 1.0.0",
 ]
 
 [[package]]
 name = "toml_parser"
-version = "1.0.9+spec-1.1.0"
+version = "1.0.10+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "702d4415e08923e7e1ef96cd5727c0dfed80b4d2fa25db9647fe5eb6f7c5a4c4"
+checksum = "7df25b4befd31c4816df190124375d5a20c6b6921e2cad937316de3fccd63420"
 dependencies = [
- "winnow",
+ "winnow 1.0.0",
 ]
 
 [[package]]
@@ -5758,6 +5930,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winnow"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a90e88e4667264a994d34e6d1ab2d26d398dcdca8b7f52bec8668957517fc7d8"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "wit-bindgen"
 version = "0.51.0"
@@ -5887,7 +6068,7 @@ dependencies = [
  "nom",
  "oid-registry",
  "rusticata-macros",
- "thiserror",
+ "thiserror 2.0.18",
  "time",
 ]
 
@@ -5925,18 +6106,18 @@ dependencies = [
 
 [[package]]
 name = "zerocopy"
-version = "0.8.42"
+version = "0.8.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2578b716f8a7a858b7f02d5bd870c14bf4ddbbcf3a4c05414ba6503640505e3"
+checksum = "efbb2a062be311f2ba113ce66f697a4dc589f85e78a4aea276200804cea0ed87"
 dependencies = [
  "zerocopy-derive",
 ]
 
 [[package]]
 name = "zerocopy-derive"
-version = "0.8.42"
+version = "0.8.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e6cc098ea4d3bd6246687de65af3f920c430e236bee1e3bf2e441463f08a02f"
+checksum = "0e8bc7269b54418e7aeeef514aa68f8690b8c0489a06b0136e5f57c4c5ccab89"
 dependencies = [
  "proc-macro2",
  "quote",

server/Cargo.toml

@@ -9,23 +9,23 @@ disallowed-methods = "deny"
 
 
 [workspace.dependencies]
-tonic = { version = "0.14.3", features = [
+tonic = { version = "0.14.5", features = [
     "deflate",
     "gzip",
     "tls-connect-info",
     "zstd",
 ] }
 tracing = "0.1.44"
-tokio = { version = "1.49.0", features = ["full"] }
+tokio = { version = "1.50.0", features = ["full"] }
 ed25519-dalek = { version = "3.0.0-pre.6", features = ["rand_core"] }
-chrono = { version = "0.4.43", features = ["serde"] }
+chrono = { version = "0.4.44", features = ["serde"] }
 rand = "0.10.0"
-rustls = { version = "0.23.36", features = ["aws-lc-rs"] }
+rustls = { version = "0.23.37", features = ["aws-lc-rs"] }
 smlang = "0.8.0"
 miette = { version = "7.6.0", features = ["fancy", "serde"] }
 thiserror = "2.0.18"
 async-trait = "0.1.89"
-futures = "0.3.31"
+futures = "0.3.32"
 tokio-stream = { version = "0.1.18", features = ["full"] }
 kameo = "0.19.2"
 prost-types = { version = "0.14.3", features = ["chrono"] }

server/crates/arbiter-client/Cargo.toml

@@ -5,4 +5,22 @@ edition = "2024"
 repository = "https://git.markettakers.org/MarketTakers/arbiter"
 license = "Apache-2.0"
 
+[lints]
+workspace = true
+
+[features]
+evm = ["dep:alloy"]
+
 [dependencies]
+arbiter-proto.path = "../arbiter-proto"
+alloy = { workspace = true, optional = true }
+tonic.workspace = true
+tonic.features = ["tls-aws-lc"]
+tokio.workspace = true
+tokio-stream.workspace = true
+ed25519-dalek.workspace = true
+thiserror.workspace = true
+http = "1.4.0"
+rustls-webpki = { version = "0.103.10", features = ["aws-lc-rs"] }
+async-trait.workspace = true
+rand.workspace = true

server/crates/arbiter-client/src/auth.rs

@@ -0,0 +1,151 @@
+use arbiter_proto::{
+    ClientMetadata, format_challenge,
+    proto::{
+        client::{
+            ClientRequest,
+            auth::{
+                self as proto_auth, AuthChallenge, AuthChallengeRequest, AuthChallengeSolution,
+                AuthResult, request::Payload as AuthRequestPayload,
+                response::Payload as AuthResponsePayload,
+            },
+            client_request::Payload as ClientRequestPayload,
+            client_response::Payload as ClientResponsePayload,
+        },
+        shared::ClientInfo as ProtoClientInfo,
+    },
+};
+use ed25519_dalek::Signer as _;
+
+use crate::{
+    storage::StorageError,
+    transport::{ClientTransport, next_request_id},
+};
+
+#[derive(Debug, thiserror::Error)]
+pub enum AuthError {
+    #[error("Auth challenge was not returned by server")]
+    MissingAuthChallenge,
+
+    #[error("Client approval denied by User Agent")]
+    ApprovalDenied,
+
+    #[error("No User Agents online to approve client")]
+    NoUserAgentsOnline,
+
+    #[error("Unexpected auth response payload")]
+    UnexpectedAuthResponse,
+
+    #[error("Signing key storage error")]
+    Storage(#[from] StorageError),
+}
+
+fn map_auth_result(code: i32) -> AuthError {
+    match AuthResult::try_from(code).unwrap_or(AuthResult::Unspecified) {
+        AuthResult::ApprovalDenied => AuthError::ApprovalDenied,
+        AuthResult::NoUserAgentsOnline => AuthError::NoUserAgentsOnline,
+        AuthResult::Unspecified
+        | AuthResult::Success
+        | AuthResult::InvalidKey
+        | AuthResult::InvalidSignature
+        | AuthResult::Internal => AuthError::UnexpectedAuthResponse,
+    }
+}
+
+async fn send_auth_challenge_request(
+    transport: &mut ClientTransport,
+    metadata: ClientMetadata,
+    key: &ed25519_dalek::SigningKey,
+) -> std::result::Result<(), AuthError> {
+    transport
+        .send(ClientRequest {
+            request_id: next_request_id(),
+            payload: Some(ClientRequestPayload::Auth(proto_auth::Request {
+                payload: Some(AuthRequestPayload::ChallengeRequest(AuthChallengeRequest {
+                    pubkey: key.verifying_key().to_bytes().to_vec(),
+                    client_info: Some(ProtoClientInfo {
+                        name: metadata.name,
+                        description: metadata.description,
+                        version: metadata.version,
+                    }),
+                })),
+            })),
+        })
+        .await
+        .map_err(|_| AuthError::UnexpectedAuthResponse)
+}
+
+async fn receive_auth_challenge(
+    transport: &mut ClientTransport,
+) -> std::result::Result<AuthChallenge, AuthError> {
+    let response = transport
+        .recv()
+        .await
+        .map_err(|_| AuthError::MissingAuthChallenge)?;
+
+    let payload = response.payload.ok_or(AuthError::MissingAuthChallenge)?;
+    match payload {
+        ClientResponsePayload::Auth(response) => match response.payload {
+            Some(AuthResponsePayload::Challenge(challenge)) => Ok(challenge),
+            Some(AuthResponsePayload::Result(result)) => Err(map_auth_result(result)),
+            None => Err(AuthError::MissingAuthChallenge),
+        },
+        _ => Err(AuthError::UnexpectedAuthResponse),
+    }
+}
+
+async fn send_auth_challenge_solution(
+    transport: &mut ClientTransport,
+    key: &ed25519_dalek::SigningKey,
+    challenge: AuthChallenge,
+) -> std::result::Result<(), AuthError> {
+    let challenge_payload = format_challenge(challenge.nonce, &challenge.pubkey);
+    let signature = key.sign(&challenge_payload).to_bytes().to_vec();
+
+    transport
+        .send(ClientRequest {
+            request_id: next_request_id(),
+            payload: Some(ClientRequestPayload::Auth(proto_auth::Request {
+                payload: Some(AuthRequestPayload::ChallengeSolution(
+                    AuthChallengeSolution { signature },
+                )),
+            })),
+        })
+        .await
+        .map_err(|_| AuthError::UnexpectedAuthResponse)
+}
+
+async fn receive_auth_confirmation(
+    transport: &mut ClientTransport,
+) -> std::result::Result<(), AuthError> {
+    let response = transport
+        .recv()
+        .await
+        .map_err(|_| AuthError::UnexpectedAuthResponse)?;
+
+    let payload = response
+        .payload
+        .ok_or(AuthError::UnexpectedAuthResponse)?;
+    match payload {
+        ClientResponsePayload::Auth(response) => match response.payload {
+            Some(AuthResponsePayload::Result(result))
+                if AuthResult::try_from(result).ok() == Some(AuthResult::Success) =>
+            {
+                Ok(())
+            }
+            Some(AuthResponsePayload::Result(result)) => Err(map_auth_result(result)),
+            _ => Err(AuthError::UnexpectedAuthResponse),
+        },
+        _ => Err(AuthError::UnexpectedAuthResponse),
+    }
+}
+
+pub(crate) async fn authenticate(
+    transport: &mut ClientTransport,
+    metadata: ClientMetadata,
+    key: &ed25519_dalek::SigningKey,
+) -> std::result::Result<(), AuthError> {
+    send_auth_challenge_request(transport, metadata, key).await?;
+    let challenge = receive_auth_challenge(transport).await?;
+    send_auth_challenge_solution(transport, key, challenge).await?;
+    receive_auth_confirmation(transport).await
+}

server/crates/arbiter-client/src/bin/test_connect.rs

@@ -0,0 +1,47 @@
+
+use std::io::{self, Write};
+
+use arbiter_client::ArbiterClient;
+use arbiter_proto::{ClientMetadata, url::ArbiterUrl};
+
+#[tokio::main]
+async fn main() {
+    println!("Testing connection to Arbiter server...");
+    print!("Enter ArbiterUrl: ");
+    let _ = io::stdout().flush();
+
+    let mut input = String::new();
+    if let Err(err) = io::stdin().read_line(&mut input) {
+        eprintln!("Failed to read input: {err}");
+        return;
+    }
+
+    let input = input.trim();
+    if input.is_empty() {
+        eprintln!("ArbiterUrl cannot be empty");
+        return;
+    }
+
+   
+
+    let url = match ArbiterUrl::try_from(input) {
+        Ok(url) => url,
+        Err(err) => {
+            eprintln!("Invalid ArbiterUrl: {err}");
+            return;
+        }
+    };
+
+     println!("{:#?}", url);
+
+    let metadata = ClientMetadata {
+        name: "arbiter-client test_connect".to_string(),
+        description: Some("Manual connection smoke test".to_string()),
+        version: Some(env!("CARGO_PKG_VERSION").to_string()),
+    };
+
+    match ArbiterClient::connect(url, metadata).await {
+        Ok(_) => println!("Connected and authenticated successfully."),
+        Err(err) => eprintln!("Failed to connect: {:#?}", err),
+    }
+}

server/crates/arbiter-client/src/client.rs

@@ -0,0 +1,89 @@
+use arbiter_proto::{ClientMetadata, proto::arbiter_service_client::ArbiterServiceClient, url::ArbiterUrl};
+use std::sync::Arc;
+use tokio::sync::{Mutex, mpsc};
+use tokio_stream::wrappers::ReceiverStream;
+use tonic::transport::ClientTlsConfig;
+
+use crate::{
+    StorageError, auth::{AuthError, authenticate}, storage::{FileSigningKeyStorage, SigningKeyStorage}, transport::{BUFFER_LENGTH, ClientTransport}
+};
+
+#[cfg(feature = "evm")]
+use crate::wallets::evm::ArbiterEvmWallet;
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("gRPC error")]
+    Grpc(#[from] tonic::Status),
+
+    #[error("Could not establish connection")]
+    Connection(#[from] tonic::transport::Error),
+
+    #[error("Invalid server URI")]
+    InvalidUri(#[from] http::uri::InvalidUri),
+
+    #[error("Invalid CA certificate")]
+    InvalidCaCert(#[from] webpki::Error),
+
+    #[error("Authentication error")]
+    Authentication(#[from] AuthError),
+
+    #[error("Storage error")]
+    Storage(#[from] StorageError),
+    
+}
+
+pub struct ArbiterClient {
+    #[allow(dead_code)]
+    transport: Arc<Mutex<ClientTransport>>,
+}
+
+impl ArbiterClient {
+    pub async fn connect(url: ArbiterUrl, metadata: ClientMetadata) -> Result<Self, Error> {
+        let storage = FileSigningKeyStorage::from_default_location()?;
+        Self::connect_with_storage(url, metadata, &storage).await
+    }
+
+    pub async fn connect_with_storage<S: SigningKeyStorage>(
+        url: ArbiterUrl,
+        metadata: ClientMetadata,
+        storage: &S,
+    ) -> Result<Self, Error> {
+        let key = storage.load_or_create()?;
+        Self::connect_with_key(url, metadata, key).await
+    }
+
+    pub async fn connect_with_key(
+        url: ArbiterUrl,
+        metadata: ClientMetadata,
+        key: ed25519_dalek::SigningKey,
+    ) -> Result<Self, Error> {
+        let anchor = webpki::anchor_from_trusted_cert(&url.ca_cert)?.to_owned();
+        let tls = ClientTlsConfig::new().trust_anchor(anchor);
+
+        let channel = tonic::transport::Channel::from_shared(format!("https://{}:{}", url.host, url.port))?
+            .tls_config(tls)?
+            .connect()
+            .await?;
+
+        let mut client = ArbiterServiceClient::new(channel);
+        let (tx, rx) = mpsc::channel(BUFFER_LENGTH);
+        let response_stream = client.client(ReceiverStream::new(rx)).await?.into_inner();
+
+        let mut transport = ClientTransport {
+            sender: tx,
+            receiver: response_stream,
+        };
+
+        authenticate(&mut transport, metadata, &key).await?;
+
+        Ok(Self {
+            transport: Arc::new(Mutex::new(transport)),
+        })
+    }
+
+    #[cfg(feature = "evm")]
+    pub async fn evm_wallets(&self) -> Result<Vec<ArbiterEvmWallet>, Error> {
+        todo!("fetch EVM wallet list from server")
+    }
+}

server/crates/arbiter-client/src/lib.rs

@@ -1,14 +1,12 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
+mod auth;
+mod client;
+mod storage;
+mod transport;
+pub mod wallets;
 
-#[cfg(test)]
-mod tests {
-    use super::*;
+pub use auth::AuthError;
+pub use client::{ArbiterClient, Error};
+pub use storage::{FileSigningKeyStorage, SigningKeyStorage, StorageError};
 
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+#[cfg(feature = "evm")]
+pub use wallets::evm::ArbiterEvmWallet;

server/crates/arbiter-client/src/storage.rs

@@ -0,0 +1,132 @@
+use arbiter_proto::home_path;
+use std::path::{Path, PathBuf};
+
+#[derive(Debug, thiserror::Error)]
+pub enum StorageError {
+    #[error("I/O error")]
+    Io(#[from] std::io::Error),
+
+    #[error("Invalid signing key length in storage: expected {expected} bytes, got {actual} bytes")]
+    InvalidKeyLength { expected: usize, actual: usize },
+}
+
+pub trait SigningKeyStorage {
+    fn load_or_create(&self) -> std::result::Result<ed25519_dalek::SigningKey, StorageError>;
+}
+
+#[derive(Debug, Clone)]
+pub struct FileSigningKeyStorage {
+    path: PathBuf,
+}
+
+impl FileSigningKeyStorage {
+    pub const DEFAULT_FILE_NAME: &str = "sdk_client_ed25519.key";
+
+    pub fn new(path: impl Into<PathBuf>) -> Self {
+        Self { path: path.into() }
+    }
+
+    pub fn from_default_location() -> std::result::Result<Self, StorageError> {
+        Ok(Self::new(home_path()?.join(Self::DEFAULT_FILE_NAME)))
+    }
+
+    fn read_key(path: &Path) -> std::result::Result<ed25519_dalek::SigningKey, StorageError> {
+        let bytes = std::fs::read(path)?;
+        let raw: [u8; 32] =
+            bytes
+                .try_into()
+                .map_err(|v: Vec<u8>| StorageError::InvalidKeyLength {
+                    expected: 32,
+                    actual: v.len(),
+                })?;
+        Ok(ed25519_dalek::SigningKey::from_bytes(&raw))
+    }
+}
+
+impl SigningKeyStorage for FileSigningKeyStorage {
+    fn load_or_create(&self) -> std::result::Result<ed25519_dalek::SigningKey, StorageError> {
+        if let Some(parent) = self.path.parent() {
+            std::fs::create_dir_all(parent)?;
+        }
+
+        if self.path.exists() {
+            return Self::read_key(&self.path);
+        }
+
+        let key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
+        let raw_key = key.to_bytes();
+
+        // Use create_new to prevent accidental overwrite if another process creates the key first.
+        match std::fs::OpenOptions::new()
+            .create_new(true)
+            .write(true)
+            .open(&self.path)
+        {
+            Ok(mut file) => {
+                use std::io::Write as _;
+                file.write_all(&raw_key)?;
+                Ok(key)
+            }
+            Err(err) if err.kind() == std::io::ErrorKind::AlreadyExists => {
+                Self::read_key(&self.path)
+            }
+            Err(err) => Err(StorageError::Io(err)),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{FileSigningKeyStorage, SigningKeyStorage, StorageError};
+
+    fn unique_temp_key_path() -> std::path::PathBuf {
+        let nanos = std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .expect("clock should be after unix epoch")
+            .as_nanos();
+        std::env::temp_dir().join(format!(
+            "arbiter-client-key-{}-{}.bin",
+            std::process::id(),
+            nanos
+        ))
+    }
+
+    #[test]
+    fn file_storage_creates_and_reuses_key() {
+        let path = unique_temp_key_path();
+        let storage = FileSigningKeyStorage::new(path.clone());
+
+        let key_a = storage
+            .load_or_create()
+            .expect("first load_or_create should create key");
+        let key_b = storage
+            .load_or_create()
+            .expect("second load_or_create should read same key");
+
+        assert_eq!(key_a.to_bytes(), key_b.to_bytes());
+        assert!(path.exists());
+
+        std::fs::remove_file(path).expect("temp key file should be removable");
+    }
+
+    #[test]
+    fn file_storage_rejects_invalid_key_length() {
+        let path = unique_temp_key_path();
+        std::fs::write(&path, [42u8; 31]).expect("should write invalid key file");
+        let storage = FileSigningKeyStorage::new(path.clone());
+
+        let err = storage
+            .load_or_create()
+            .expect_err("storage should reject non-32-byte key file");
+
+        match err {
+            StorageError::InvalidKeyLength { expected, actual } => {
+                assert_eq!(expected, 32);
+                assert_eq!(actual, 31);
+            }
+            other => panic!("unexpected error: {other:?}"),
+        }
+
+        std::fs::remove_file(path).expect("temp key file should be removable");
+    }
+}

server/crates/arbiter-client/src/transport.rs

@@ -0,0 +1,44 @@
+use arbiter_proto::proto::client::{ClientRequest, ClientResponse};
+use std::sync::atomic::{AtomicI32, Ordering};
+use tokio::sync::mpsc;
+
+pub(crate) const BUFFER_LENGTH: usize = 16;
+static NEXT_REQUEST_ID: AtomicI32 = AtomicI32::new(1);
+
+pub(crate) fn next_request_id() -> i32 {
+    NEXT_REQUEST_ID.fetch_add(1, Ordering::Relaxed)
+}
+
+#[derive(Debug, thiserror::Error)]
+pub(crate) enum ClientSignError {
+    #[error("Transport channel closed")]
+    ChannelClosed,
+
+    #[error("Connection closed by server")]
+    ConnectionClosed,
+}
+
+pub(crate) struct ClientTransport {
+    pub(crate) sender: mpsc::Sender<ClientRequest>,
+    pub(crate) receiver: tonic::Streaming<ClientResponse>,
+}
+
+impl ClientTransport {
+    pub(crate) async fn send(
+        &mut self,
+        request: ClientRequest,
+    ) -> std::result::Result<(), ClientSignError> {
+        self.sender
+            .send(request)
+            .await
+            .map_err(|_| ClientSignError::ChannelClosed)
+    }
+
+    pub(crate) async fn recv(&mut self) -> std::result::Result<ClientResponse, ClientSignError> {
+        match self.receiver.message().await {
+            Ok(Some(resp)) => Ok(resp),
+            Ok(None) => Err(ClientSignError::ConnectionClosed),
+            Err(_) => Err(ClientSignError::ConnectionClosed),
+        }
+    }
+}

server/crates/arbiter-client/src/wallets/evm.rs

@@ -0,0 +1,147 @@
+use alloy::{
+    consensus::SignableTransaction,
+    network::TxSigner,
+    primitives::{Address, B256, ChainId, Signature},
+    signers::{Error, Result, Signer},
+};
+use async_trait::async_trait;
+use std::sync::Arc;
+use tokio::sync::Mutex;
+
+use arbiter_proto::proto::{
+    client::{
+        ClientRequest, client_request::Payload as ClientRequestPayload,
+        client_response::Payload as ClientResponsePayload,
+    },
+    evm::evm_sign_transaction_response::Result as EvmSignTransactionResult,
+};
+
+use crate::transport::{ClientTransport, next_request_id};
+
+pub struct ArbiterEvmWallet {
+    transport: Arc<Mutex<ClientTransport>>,
+    address: Address,
+    chain_id: Option<ChainId>,
+}
+
+impl ArbiterEvmWallet {
+    pub(crate) fn new(transport: Arc<Mutex<ClientTransport>>, address: Address) -> Self {
+        Self {
+            transport,
+            address,
+            chain_id: None,
+        }
+    }
+
+    pub fn address(&self) -> Address {
+        self.address
+    }
+
+    pub fn with_chain_id(mut self, chain_id: ChainId) -> Self {
+        self.chain_id = Some(chain_id);
+        self
+    }
+
+    fn validate_chain_id(&self, tx: &mut dyn SignableTransaction<Signature>) -> Result<()> {
+        if let Some(chain_id) = self.chain_id
+            && !tx.set_chain_id_checked(chain_id)
+        {
+            return Err(Error::TransactionChainIdMismatch {
+                signer: chain_id,
+                tx: tx.chain_id().unwrap(),
+            });
+        }
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl Signer for ArbiterEvmWallet {
+    async fn sign_hash(&self, _hash: &B256) -> Result<Signature> {
+        Err(Error::other(
+            "hash-only signing is not supported for ArbiterEvmWallet; use transaction signing",
+        ))
+    }
+
+    fn address(&self) -> Address {
+        self.address
+    }
+
+    fn chain_id(&self) -> Option<ChainId> {
+        self.chain_id
+    }
+
+    fn set_chain_id(&mut self, chain_id: Option<ChainId>) {
+        self.chain_id = chain_id;
+    }
+}
+
+#[async_trait]
+impl TxSigner<Signature> for ArbiterEvmWallet {
+    fn address(&self) -> Address {
+        self.address
+    }
+
+    async fn sign_transaction(
+        &self,
+        tx: &mut dyn SignableTransaction<Signature>,
+    ) -> Result<Signature> {
+        self.validate_chain_id(tx)?;
+
+        let mut transport = self.transport.lock().await;
+        let request_id = next_request_id();
+        let rlp_transaction = tx.encoded_for_signing();
+
+        transport
+            .send(ClientRequest {
+                request_id,
+                payload: Some(ClientRequestPayload::EvmSignTransaction(
+                    arbiter_proto::proto::evm::EvmSignTransactionRequest {
+                        wallet_address: self.address.to_vec(),
+                        rlp_transaction,
+                    },
+                )),
+            })
+            .await
+            .map_err(|_| Error::other("failed to send evm sign transaction request"))?;
+
+        let response = transport
+            .recv()
+            .await
+            .map_err(|_| Error::other("failed to receive evm sign transaction response"))?;
+
+        if response.request_id != Some(request_id) {
+            return Err(Error::other(
+                "received mismatched response id for evm sign transaction",
+            ));
+        }
+
+        let payload = response
+            .payload
+            .ok_or_else(|| Error::other("missing evm sign transaction response payload"))?;
+
+        let ClientResponsePayload::EvmSignTransaction(response) = payload else {
+            return Err(Error::other(
+                "unexpected response payload for evm sign transaction request",
+            ));
+        };
+
+        let result = response
+            .result
+            .ok_or_else(|| Error::other("missing evm sign transaction result"))?;
+
+        match result {
+            EvmSignTransactionResult::Signature(signature) => {
+                Signature::try_from(signature.as_slice())
+                    .map_err(|_| Error::other("invalid signature returned by server"))
+            }
+            EvmSignTransactionResult::EvalError(eval_error) => Err(Error::other(format!(
+                "transaction rejected by policy: {eval_error:?}"
+            ))),
+            EvmSignTransactionResult::Error(code) => Err(Error::other(format!(
+                "server failed to sign transaction with error code {code}"
+            ))),
+        }
+    }
+}

server/crates/arbiter-client/src/wallets/mod.rs

@@ -0,0 +1,2 @@
+#[cfg(feature = "evm")]
+pub mod evm;

server/crates/arbiter-proto/Cargo.toml

@@ -10,7 +10,7 @@ tonic.workspace = true
 tokio.workspace = true
 futures.workspace = true
 hex = "0.4.3"
-tonic-prost = "0.14.3"
+tonic-prost = "0.14.5"
 prost = "0.14.3"
 kameo.workspace = true
 url = "2.5.8"
@@ -21,9 +21,11 @@ base64 = "0.22.1"
 prost-types.workspace = true
 tracing.workspace = true
 async-trait.workspace = true
+tokio-stream.workspace = true
 
 [build-dependencies]
-tonic-prost-build = "0.14.3"
+tonic-prost-build = "0.14.5"
+protoc-bin-vendored = "3"
 
 [dev-dependencies]
 rstest.workspace = true
@@ -32,5 +34,3 @@ rcgen.workspace = true
 
 [package.metadata.cargo-shear]
 ignored = ["tonic-prost", "prost", "kameo"]
-
-

server/crates/arbiter-proto/src/lib.rs

@@ -6,12 +6,56 @@ use base64::{Engine, prelude::BASE64_STANDARD};
 pub mod proto {
     tonic::include_proto!("arbiter");
 
+    pub mod shared {
+        tonic::include_proto!("arbiter.shared");
+
+        pub mod evm {
+            tonic::include_proto!("arbiter.shared.evm");
+        }
+    }
+
     pub mod user_agent {
         tonic::include_proto!("arbiter.user_agent");
+
+        pub mod auth {
+            tonic::include_proto!("arbiter.user_agent.auth");
+        }
+
+        pub mod evm {
+            tonic::include_proto!("arbiter.user_agent.evm");
+        }
+
+        pub mod sdk_client {
+            tonic::include_proto!("arbiter.user_agent.sdk_client");
+        }
+
+        pub mod vault {
+            tonic::include_proto!("arbiter.user_agent.vault");
+
+            pub mod bootstrap {
+                tonic::include_proto!("arbiter.user_agent.vault.bootstrap");
+            }
+
+            pub mod unseal {
+                tonic::include_proto!("arbiter.user_agent.vault.unseal");
+            }
+        }
     }
 
     pub mod client {
         tonic::include_proto!("arbiter.client");
+
+        pub mod auth {
+            tonic::include_proto!("arbiter.client.auth");
+        }
+
+        pub mod evm {
+            tonic::include_proto!("arbiter.client.evm");
+        }
+
+        pub mod vault {
+            tonic::include_proto!("arbiter.client.vault");
+        }
     }
 
     pub mod evm {
@@ -19,6 +63,13 @@ pub mod proto {
     }
 }
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ClientMetadata {
+    pub name: String,
+    pub description: Option<String>,
+    pub version: Option<String>,
+}
+
 pub static BOOTSTRAP_PATH: &str = "bootstrap_token";
 
 pub fn home_path() -> Result<std::path::PathBuf, std::io::Error> {

server/crates/arbiter-proto/src/transport.rs

@@ -1,29 +1,49 @@
 //! Transport-facing abstractions shared by protocol/session code.
 //!
-//! This module defines a small duplex interface, [`Bi`], that actors and other
+//! This module defines a small set of transport traits that actors and other
 //! protocol code can depend on without knowing anything about the concrete
 //! transport underneath.
 //!
-//! [`Bi`] is intentionally minimal and transport-agnostic:
-//! - [`Bi::recv`] yields inbound messages
-//! - [`Bi::send`] accepts outbound messages
+//! The abstraction is split into:
+//! - [`Sender`] for outbound delivery
+//! - [`Receiver`] for inbound delivery
+//! - [`Bi`] as the combined duplex form (`Sender + Receiver`)
+//!
+//! This split lets code depend only on the half it actually needs. For
+//! example, some actor/session code only sends out-of-band messages, while
+//! auth/state-machine code may need full duplex access.
+//!
+//! [`Bi`] remains intentionally minimal and transport-agnostic:
+//! - [`Receiver::recv`] yields inbound messages
+//! - [`Sender::send`] accepts outbound messages
 //!
 //! Transport-specific adapters, including protobuf or gRPC bridges, live in the
 //! crates that own those boundaries rather than in `arbiter-proto`.
 //!
+//! [`Bi`] deliberately does not model request/response correlation. Some
+//! transports may carry multiplexed request/response traffic, some may emit
+//! out-of-band messages, and some may be one-message-at-a-time state machines.
+//! Correlation concerns such as request IDs, pending response maps, and
+//! out-of-band routing belong in the adapter or connection layer built on top
+//! of [`Bi`], not in this abstraction itself.
+//!
 //! # Generic Ordering Rule
 //!
 //! This module consistently uses `Inbound` first and `Outbound` second in
 //! generic parameter lists.
 //!
-//! For [`Bi`], that means `Bi<Inbound, Outbound>`:
+//! For [`Receiver`], [`Sender`], and [`Bi`], this means:
+//! - `Receiver<Inbound>`
+//! - `Sender<Outbound>`
+//! - `Bi<Inbound, Outbound>`
+//!
+//! Concretely, for [`Bi`]:
 //! - `recv() -> Option<Inbound>`
 //! - `send(Outbound)`
 //!
-//! [`expect_message`] is a small helper for request/response style flows: it
-//! reads one inbound message from a transport and extracts a typed value from
-//! it, failing if the channel closes or the message shape is not what the
-//! caller expected.
+//! [`expect_message`] is a small helper for linear protocol steps: it reads one
+//! inbound message from a transport and extracts a typed value from it, failing
+//! if the channel closes or the message shape is not what the caller expected.
 //!
 //! [`DummyTransport`] is a no-op implementation useful for tests and local
 //! actor execution where no real stream exists.
@@ -63,16 +83,35 @@ where
     extractor(msg).ok_or(Error::UnexpectedMessage)
 }
 
+#[async_trait]
+pub trait Sender<Outbound>: Send + Sync {
+    async fn send(&mut self, item: Outbound) -> Result<(), Error>;
+}
+
+#[async_trait]
+pub trait Receiver<Inbound>: Send + Sync {
+    async fn recv(&mut self) -> Option<Inbound>;
+}
+
 /// Minimal bidirectional transport abstraction used by protocol code.
 ///
-/// `Bi<Inbound, Outbound>` models a duplex channel with:
+/// `Bi<Inbound, Outbound>` is the combined duplex form of [`Sender`] and
+/// [`Receiver`].
+///
+/// It models a channel with:
 /// - inbound items of type `Inbound` read via [`Bi::recv`]
 /// - outbound items of type `Outbound` written via [`Bi::send`]
-#[async_trait]
-pub trait Bi<Inbound, Outbound>: Send + Sync + 'static {
-    async fn send(&mut self, item: Outbound) -> Result<(), Error>;
+///
+/// It does not imply request/response sequencing, one-at-a-time exchange, or
+/// any built-in correlation mechanism between inbound and outbound items.
+pub trait Bi<Inbound, Outbound>: Sender<Outbound> + Receiver<Inbound> + Send + Sync {}
 
-    async fn recv(&mut self) -> Option<Inbound>;
+pub trait SplittableBi<Inbound, Outbound>: Bi<Inbound, Outbound> {
+    type Sender: Sender<Outbound>;
+    type Receiver: Receiver<Inbound>;
+
+    fn split(self) -> (Self::Sender, Self::Receiver);
+    fn from_parts(sender: Self::Sender, receiver: Self::Receiver) -> Self;
 }
 
 /// No-op [`Bi`] transport for tests and manual actor usage.
@@ -83,22 +122,16 @@ pub struct DummyTransport<Inbound, Outbound> {
     _marker: PhantomData<(Inbound, Outbound)>,
 }
 
-impl<Inbound, Outbound> DummyTransport<Inbound, Outbound> {
-    pub fn new() -> Self {
+impl<Inbound, Outbound> Default for DummyTransport<Inbound, Outbound> {
+    fn default() -> Self {
         Self {
             _marker: PhantomData,
         }
     }
 }
 
-impl<Inbound, Outbound> Default for DummyTransport<Inbound, Outbound> {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
 #[async_trait]
-impl<Inbound, Outbound> Bi<Inbound, Outbound> for DummyTransport<Inbound, Outbound>
+impl<Inbound, Outbound> Sender<Outbound> for DummyTransport<Inbound, Outbound>
 where
     Inbound: Send + Sync + 'static,
     Outbound: Send + Sync + 'static,
@@ -106,9 +139,25 @@ where
     async fn send(&mut self, _item: Outbound) -> Result<(), Error> {
         Ok(())
     }
+}
 
+#[async_trait]
+impl<Inbound, Outbound> Receiver<Inbound> for DummyTransport<Inbound, Outbound>
+where
+    Inbound: Send + Sync + 'static,
+    Outbound: Send + Sync + 'static,
+{
     async fn recv(&mut self) -> Option<Inbound> {
         std::future::pending::<()>().await;
         None
     }
 }
+
+impl<Inbound, Outbound> Bi<Inbound, Outbound> for DummyTransport<Inbound, Outbound>
+where
+    Inbound: Send + Sync + 'static,
+    Outbound: Send + Sync + 'static,
+{
+}
+
+pub mod grpc;

server/crates/arbiter-proto/src/transport/grpc.rs

@@ -0,0 +1,106 @@
+use async_trait::async_trait;
+use futures::StreamExt;
+use tokio::sync::mpsc;
+use tokio_stream::wrappers::ReceiverStream;
+
+use super::{Bi, Receiver, Sender};
+
+pub struct GrpcSender<Outbound> {
+    tx: mpsc::Sender<Result<Outbound, tonic::Status>>,
+}
+
+#[async_trait]
+impl<Outbound> Sender<Result<Outbound, tonic::Status>> for GrpcSender<Outbound>
+where
+    Outbound: Send + Sync + 'static,
+{
+    async fn send(&mut self, item: Result<Outbound, tonic::Status>) -> Result<(), super::Error> {
+        self.tx
+            .send(item)
+            .await
+            .map_err(|_| super::Error::ChannelClosed)
+    }
+}
+
+pub struct GrpcReceiver<Inbound> {
+    rx: tonic::Streaming<Inbound>,
+}
+#[async_trait]
+impl<Inbound> Receiver<Result<Inbound, tonic::Status>> for GrpcReceiver<Inbound>
+where
+    Inbound: Send + Sync + 'static,
+{
+    async fn recv(&mut self) -> Option<Result<Inbound, tonic::Status>> {
+        self.rx.next().await
+    }
+}
+
+pub struct GrpcBi<Inbound, Outbound> {
+    sender: GrpcSender<Outbound>,
+    receiver: GrpcReceiver<Inbound>,
+}
+
+impl<Inbound, Outbound> GrpcBi<Inbound, Outbound>
+where
+    Inbound: Send + Sync + 'static,
+    Outbound: Send + Sync + 'static,
+{
+    pub fn from_bi_stream(
+        receiver: tonic::Streaming<Inbound>,
+    ) -> (Self, ReceiverStream<Result<Outbound, tonic::Status>>) {
+        let (tx, rx) = mpsc::channel(10);
+        let sender = GrpcSender { tx };
+        let receiver = GrpcReceiver { rx: receiver };
+        let bi = GrpcBi { sender, receiver };
+        (bi, ReceiverStream::new(rx))
+    }
+}
+
+#[async_trait]
+impl<Inbound, Outbound> Sender<Result<Outbound, tonic::Status>> for GrpcBi<Inbound, Outbound>
+where
+    Inbound: Send + Sync + 'static,
+    Outbound: Send + Sync + 'static,
+{
+    async fn send(&mut self, item: Result<Outbound, tonic::Status>) -> Result<(), super::Error> {
+        self.sender.send(item).await
+    }
+}
+
+#[async_trait]
+impl<Inbound, Outbound> Receiver<Result<Inbound, tonic::Status>> for GrpcBi<Inbound, Outbound>
+where
+    Inbound: Send + Sync + 'static,
+    Outbound: Send + Sync + 'static,
+{
+    async fn recv(&mut self) -> Option<Result<Inbound, tonic::Status>> {
+        self.receiver.recv().await
+    }
+}
+
+impl<Inbound, Outbound> Bi<Result<Inbound, tonic::Status>, Result<Outbound, tonic::Status>>
+    for GrpcBi<Inbound, Outbound>
+where
+    Inbound: Send + Sync + 'static,
+    Outbound: Send + Sync + 'static,
+{
+}
+
+impl<Inbound, Outbound>
+    super::SplittableBi<Result<Inbound, tonic::Status>, Result<Outbound, tonic::Status>>
+    for GrpcBi<Inbound, Outbound>
+where
+    Inbound: Send + Sync + 'static,
+    Outbound: Send + Sync + 'static,
+{
+    type Sender = GrpcSender<Outbound>;
+    type Receiver = GrpcReceiver<Inbound>;
+
+    fn split(self) -> (Self::Sender, Self::Receiver) {
+        (self.sender, self.receiver)
+    }
+
+    fn from_parts(sender: Self::Sender, receiver: Self::Receiver) -> Self {
+        GrpcBi { sender, receiver }
+    }
+}

server/crates/arbiter-proto/src/url.rs

@@ -7,6 +7,8 @@ const ARBITER_URL_SCHEME: &str = "arbiter";
 const CERT_QUERY_KEY: &str = "cert";
 const BOOTSTRAP_TOKEN_QUERY_KEY: &str = "bootstrap_token";
 
+
+#[derive(Debug, Clone)]
 pub struct ArbiterUrl {
     pub host: String,
     pub port: u16,

server/crates/arbiter-server/Cargo.toml

@@ -9,8 +9,8 @@ license = "Apache-2.0"
 workspace = true
 
 [dependencies]
-diesel = { version = "2.3.6", features = ["chrono", "returning_clauses_for_sqlite_3_35", "serde_json", "time", "uuid"] }
-diesel-async = { version = "0.7.4", features = [
+diesel = { version = "2.3.7", features = ["chrono", "returning_clauses_for_sqlite_3_35", "serde_json", "time", "uuid"] }
+diesel-async = { version = "0.8.0", features = [
     "bb8",
     "migrations",
     "sqlite",
@@ -27,6 +27,7 @@ rustls.workspace = true
 smlang.workspace = true
 miette.workspace = true
 thiserror.workspace = true
+fatality = "0.1.1"
 diesel_migrations = { version = "2.3.1", features = ["sqlite"] }
 async-trait.workspace = true
 secrecy = "0.10.3"
@@ -43,7 +44,7 @@ x25519-dalek.workspace = true
 chacha20poly1305 = { version = "0.10.1", features = ["std"] }
 argon2 = { version = "0.5.3", features = ["zeroize"] }
 restructed = "0.2.2"
-strum = { version = "0.27.2", features = ["derive"] }
+strum = { version = "0.28.0", features = ["derive"] }
 pem = "3.0.6"
 k256.workspace = true
 rsa.workspace = true

server/crates/arbiter-server/migrations/2026-02-14-171124-0000_init/up.sql

@@ -40,7 +40,8 @@ create table if not exists arbiter_settings (
     tls_id integer references tls_history (id) on delete RESTRICT
 ) STRICT;
 
-insert into arbiter_settings (id) values (1) on conflict do nothing; -- ensure singleton row exists
+insert into arbiter_settings (id) values (1) on conflict do nothing;
+-- ensure singleton row exists
 
 create table if not exists useragent_client (
     id integer not null primary key,
@@ -50,15 +51,40 @@ create table if not exists useragent_client (
     created_at integer not null default(unixepoch ('now')),
     updated_at integer not null default(unixepoch ('now'))
 ) STRICT;
+create unique index if not exists uniq_useragent_client_public_key on useragent_client (public_key, key_type);
+
+create table if not exists client_metadata (
+    id integer not null primary key,
+    name text not null, -- human-readable name for the client
+    description text, -- optional description for the client
+    version text, -- client version for tracking and debugging
+    created_at integer not null default(unixepoch ('now'))
+) STRICT;
+
+-- created to track history of changes
+create table if not exists client_metadata_history (
+    id integer not null primary key,
+    metadata_id integer not null references client_metadata (id) on delete cascade,
+    client_id integer not null references program_client (id) on delete cascade,
+    created_at integer not null default(unixepoch ('now'))
+) STRICT;
+
+create unique index if not exists uniq_metadata_binding_client on client_metadata_history (client_id);
 
 create table if not exists program_client (
     id integer not null primary key,
     nonce integer not null default(1), -- used for auth challenge
     public_key blob not null,
+    metadata_id integer not null references client_metadata (id) on delete cascade,
     created_at integer not null default(unixepoch ('now')),
     updated_at integer not null default(unixepoch ('now'))
 ) STRICT;
 
+create unique index if not exists program_client_public_key_unique
+    on program_client (public_key);
+
+create unique index if not exists uniq_program_client_public_key on program_client (public_key);
+
 create table if not exists evm_wallet (
     id integer not null primary key,
     address blob not null, -- 20-byte Ethereum address
@@ -67,8 +93,18 @@ create table if not exists evm_wallet (
 ) STRICT;
 
 create unique index if not exists uniq_evm_wallet_address on evm_wallet (address);
+
 create unique index if not exists uniq_evm_wallet_aead on evm_wallet (aead_encrypted_id);
 
+create table if not exists evm_wallet_access (
+    id integer not null primary key,
+    wallet_id integer not null references evm_wallet (id) on delete cascade,
+    client_id integer not null references program_client (id) on delete cascade,
+    created_at integer not null default(unixepoch ('now'))
+) STRICT;
+
+create unique index if not exists uniq_wallet_access on evm_wallet_access (wallet_id, client_id);
+
 create table if not exists evm_ether_transfer_limit (
     id integer not null primary key,
     window_secs integer not null, -- window duration in seconds
@@ -78,8 +114,7 @@ create table if not exists evm_ether_transfer_limit (
 -- Shared grant properties: client scope, timeframe, fee caps, and rate limit
 create table if not exists evm_basic_grant (
     id integer not null primary key,
-    wallet_id integer not null references evm_wallet(id) on delete restrict, 
-    client_id integer not null references program_client(id) on delete restrict,
+    wallet_access_id integer not null references evm_wallet_access (id) on delete restrict,
     chain_id integer not null, -- EIP-155 chain ID
     valid_from integer, -- unix timestamp (seconds), null = no lower bound
     valid_until integer, -- unix timestamp (seconds), null = no upper bound
@@ -94,15 +129,14 @@ create table if not exists evm_basic_grant (
 -- Shared transaction log for all EVM grants, used for rate limit tracking and auditing
 create table if not exists evm_transaction_log (
     id integer not null primary key,
+    wallet_access_id integer not null references evm_wallet_access (id) on delete restrict,
     grant_id integer not null references evm_basic_grant (id) on delete restrict,
-    client_id integer not null references program_client(id) on delete restrict,
-    wallet_id integer not null references evm_wallet(id) on delete restrict,
     chain_id integer not null,
     eth_value blob not null, -- always present on any EVM tx
     signed_at integer not null default(unixepoch ('now'))
 ) STRICT;
 
-create index if not exists idx_evm_basic_grant_wallet_chain on evm_basic_grant(client_id, wallet_id, chain_id);
+create index if not exists idx_evm_basic_grant_access_chain on evm_basic_grant (wallet_access_id, chain_id);
 
 -- ===============================
 -- ERC20 token transfer grant
@@ -135,9 +169,10 @@ create table if not exists evm_token_transfer_log (
 ) STRICT;
 
 create index if not exists idx_token_transfer_log_grant on evm_token_transfer_log (grant_id);
-create index if not exists idx_token_transfer_log_log_id on evm_token_transfer_log(log_id);
-create index if not exists idx_token_transfer_log_chain on evm_token_transfer_log(chain_id);
 
+create index if not exists idx_token_transfer_log_log_id on evm_token_transfer_log (log_id);
+
+create index if not exists idx_token_transfer_log_chain on evm_token_transfer_log (chain_id);
 
 -- ===============================
 -- Ether transfer grant (uses base log)
@@ -156,4 +191,3 @@ create table if not exists evm_ether_transfer_grant_target (
 ) STRICT;
 
 create unique index if not exists uniq_ether_transfer_target on evm_ether_transfer_grant_target (grant_id, address);
-

server/crates/arbiter-server/src/actors/client/auth.rs

@@ -1,30 +1,31 @@
-use arbiter_proto::{format_challenge, transport::expect_message};
+use arbiter_proto::{
+    ClientMetadata, format_challenge,
+    transport::{Bi, expect_message},
+};
+use chrono::Utc;
 use diesel::{
-    ExpressionMethods as _, OptionalExtension as _, QueryDsl as _, dsl::insert_into, update,
+    ExpressionMethods as _, OptionalExtension as _, QueryDsl as _, SelectableHelper as _,
+    dsl::insert_into, update,
 };
 use diesel_async::RunQueryDsl as _;
-use ed25519_dalek::VerifyingKey;
+use ed25519_dalek::{Signature, VerifyingKey};
 use kameo::error::SendError;
 use tracing::error;
 
 use crate::{
     actors::{
-        client::{ClientConnection, ConnectErrorCode, Request, Response},
-        router::{self, RequestClientApproval},
+        client::{ClientConnection, ClientProfile},
+        flow_coordinator::{self, RequestClientApproval},
+    },
+    db::{
+        self,
+        models::{ProgramClientMetadata, SqliteTimestamp},
+        schema::program_client,
     },
-    db::{self, schema::program_client},
 };
 
-use super::session::ClientSession;
-
 #[derive(thiserror::Error, Debug, Clone, PartialEq, Eq)]
 pub enum Error {
-    #[error("Unexpected message payload")]
-    UnexpectedMessagePayload,
-    #[error("Invalid client public key length")]
-    InvalidClientPubkeyLength,
-    #[error("Invalid client public key encoding")]
-    InvalidAuthPubkeyEncoding,
     #[error("Database pool unavailable")]
     DatabasePoolUnavailable,
     #[error("Database operation failed")]
@@ -33,8 +34,6 @@ pub enum Error {
     InvalidChallengeSolution,
     #[error("Client approval request failed")]
     ApproveError(#[from] ApproveError),
-    #[error("Internal error")]
-    InternalError,
     #[error("Transport error")]
     Transport,
 }
@@ -46,12 +45,37 @@ pub enum ApproveError {
     #[error("Client connection denied by user agents")]
     Denied,
     #[error("Upstream error: {0}")]
-    Upstream(router::ApprovalError),
+    Upstream(flow_coordinator::ApprovalError),
+}
+
+#[derive(Debug, Clone)]
+pub enum Inbound {
+    AuthChallengeRequest {
+        pubkey: VerifyingKey,
+        metadata: ClientMetadata,
+    },
+    AuthChallengeSolution {
+        signature: Signature,
+    },
+}
+
+#[derive(Debug, Clone)]
+pub enum Outbound {
+    AuthChallenge { pubkey: VerifyingKey, nonce: i32 },
+    AuthSuccess,
+}
+
+pub struct ClientInfo {
+    pub id: i32,
+    pub current_nonce: i32,
 }
 
 /// Atomically reads and increments the nonce for a known client.
 /// Returns `None` if the pubkey is not registered.
-async fn get_nonce(db: &db::DatabasePool, pubkey: &VerifyingKey) -> Result<Option<i32>, Error> {
+async fn get_client_and_nonce(
+    db: &db::DatabasePool,
+    pubkey: &VerifyingKey,
+) -> Result<Option<ClientInfo>, Error> {
     let pubkey_bytes = pubkey.as_bytes().to_vec();
 
     let mut conn = db.get().await.map_err(|e| {
@@ -60,12 +84,11 @@ async fn get_nonce(db: &db::DatabasePool, pubkey: &VerifyingKey) -> Result<Optio
     })?;
 
     conn.exclusive_transaction(|conn| {
-        let pubkey_bytes = pubkey_bytes.clone();
         Box::pin(async move {
-            let Some(current_nonce) = program_client::table
+            let Some((client_id, current_nonce)) = program_client::table
                 .filter(program_client::public_key.eq(&pubkey_bytes))
-                .select(program_client::nonce)
-                .first::<i32>(conn)
+                .select((program_client::id, program_client::nonce))
+                .first::<(i32, i32)>(conn)
                 .await
                 .optional()?
             else {
@@ -78,7 +101,10 @@ async fn get_nonce(db: &db::DatabasePool, pubkey: &VerifyingKey) -> Result<Optio
                 .execute(conn)
                 .await?;
 
-            Ok(Some(current_nonce))
+            Ok(Some(ClientInfo {
+                id: client_id,
+                current_nonce,
+            }))
         })
     })
     .await
@@ -90,13 +116,11 @@ async fn get_nonce(db: &db::DatabasePool, pubkey: &VerifyingKey) -> Result<Optio
 
 async fn approve_new_client(
     actors: &crate::actors::GlobalActors,
-    pubkey: VerifyingKey,
+    profile: ClientProfile,
 ) -> Result<(), Error> {
     let result = actors
-        .router
-        .ask(RequestClientApproval {
-            client_pubkey: pubkey,
-        })
+        .flow_coordinator
+        .ask(RequestClientApproval { client: profile })
         .await;
 
     match result {
@@ -107,61 +131,144 @@ async fn approve_new_client(
             Err(Error::ApproveError(ApproveError::Upstream(e)))
         }
         Err(e) => {
-            error!(error = ?e, "Approval request to router failed");
+            error!(error = ?e, "Approval request to flow coordinator failed");
             Err(Error::ApproveError(ApproveError::Internal))
         }
     }
 }
 
-async fn insert_client(db: &db::DatabasePool, pubkey: &VerifyingKey) -> Result<(), Error> {
-    let now = std::time::SystemTime::now()
-        .duration_since(std::time::UNIX_EPOCH)
-        .unwrap_or_default()
-        .as_secs() as i32;
+async fn insert_client(
+    db: &db::DatabasePool,
+    pubkey: &VerifyingKey,
+    metadata: &ClientMetadata,
+) -> Result<i32, Error> {
+    use crate::db::schema::{client_metadata, program_client};
+    let mut conn = db.get().await.map_err(|e| {
+        error!(error = ?e, "Database pool error");
+        Error::DatabasePoolUnavailable
+    })?;
+
+    let metadata_id = insert_into(client_metadata::table)
+        .values((
+            client_metadata::name.eq(&metadata.name),
+            client_metadata::description.eq(&metadata.description),
+            client_metadata::version.eq(&metadata.version),
+        ))
+        .returning(client_metadata::id)
+        .get_result::<i32>(&mut conn)
+        .await
+        .map_err(|e| {
+            error!(error = ?e, "Failed to insert client metadata");
+            Error::DatabaseOperationFailed
+        })?;
+
+    let client_id = insert_into(program_client::table)
+        .values((
+            program_client::public_key.eq(pubkey.as_bytes().to_vec()),
+            program_client::metadata_id.eq(metadata_id),
+            program_client::nonce.eq(1), // pre-incremented; challenge uses 0
+        ))
+        .on_conflict_do_nothing()
+        .returning(program_client::id)
+        .get_result::<i32>(&mut conn)
+        .await
+        .map_err(|e| {
+            error!(error = ?e, "Failed to insert client metadata");
+            Error::DatabaseOperationFailed
+        })?;
+
+    Ok(client_id)
+}
+
+async fn sync_client_metadata(
+    db: &db::DatabasePool,
+    client_id: i32,
+    metadata: &ClientMetadata,
+) -> Result<(), Error> {
+    use crate::db::schema::{client_metadata, client_metadata_history};
+
+    let now = SqliteTimestamp(Utc::now());
 
     let mut conn = db.get().await.map_err(|e| {
         error!(error = ?e, "Database pool error");
         Error::DatabasePoolUnavailable
     })?;
 
-    insert_into(program_client::table)
-        .values((
-            program_client::public_key.eq(pubkey.as_bytes().to_vec()),
-            program_client::nonce.eq(1), // pre-incremented; challenge uses 0
-            program_client::created_at.eq(now),
-            program_client::updated_at.eq(now),
+    conn.exclusive_transaction(|conn| {
+        let metadata = metadata.clone();
+        Box::pin(async move {
+            let (current_metadata_id, current): (i32, ProgramClientMetadata) =
+                program_client::table
+                    .find(client_id)
+                    .inner_join(client_metadata::table)
+                    .select((
+                        program_client::metadata_id,
+                        ProgramClientMetadata::as_select(),
                     ))
-        .execute(&mut conn)
-        .await
-        .map_err(|e| {
-            error!(error = ?e, "Failed to insert new client");
-            Error::DatabaseOperationFailed
-        })?;
+                    .first(conn)
+                    .await?;
 
-    Ok(())
+            let unchanged = current.name == metadata.name
+                && current.description == metadata.description
+                && current.version == metadata.version;
+            if unchanged {
+                return Ok(());
             }
 
-async fn challenge_client(
-    props: &mut ClientConnection,
+            insert_into(client_metadata_history::table)
+                .values((
+                    client_metadata_history::metadata_id.eq(current_metadata_id),
+                    client_metadata_history::client_id.eq(client_id),
+                ))
+                .execute(conn)
+                .await?;
+
+            let metadata_id = insert_into(client_metadata::table)
+                .values((
+                    client_metadata::name.eq(&metadata.name),
+                    client_metadata::description.eq(&metadata.description),
+                    client_metadata::version.eq(&metadata.version),
+                ))
+                .returning(client_metadata::id)
+                .get_result::<i32>(conn)
+                .await?;
+
+            update(program_client::table.find(client_id))
+                .set((
+                    program_client::metadata_id.eq(metadata_id),
+                    program_client::updated_at.eq(now),
+                ))
+                .execute(conn)
+                .await?;
+
+            Ok::<(), diesel::result::Error>(())
+        })
+    })
+    .await
+    .map_err(|e| {
+        error!(error = ?e, "Database error");
+        Error::DatabaseOperationFailed
+    })
+}
+
+async fn challenge_client<T>(
+    transport: &mut T,
     pubkey: VerifyingKey,
     nonce: i32,
-) -> Result<(), Error> {
-    let challenge_pubkey = pubkey.as_bytes().to_vec();
-
-    props
-        .transport
-        .send(Ok(Response::AuthChallenge {
-            pubkey: challenge_pubkey.clone(),
-            nonce,
-        }))
+) -> Result<(), Error>
+where
+    T: Bi<Inbound, Result<Outbound, Error>> + ?Sized,
+{
+    transport
+        .send(Ok(Outbound::AuthChallenge { pubkey, nonce }))
         .await
         .map_err(|e| {
             error!(error = ?e, "Failed to send auth challenge");
             Error::Transport
         })?;
 
-    let signature = expect_message(&mut *props.transport, |req: Request| match req {
-        Request::AuthChallengeSolution { signature } => Some(signature),
+    let signature = expect_message(transport, |req: Inbound| match req {
+        Inbound::AuthChallengeSolution { signature } => Some(signature),
         _ => None,
     })
     .await
@@ -170,13 +277,9 @@ async fn challenge_client(
         Error::Transport
     })?;
 
-    let formatted = format_challenge(nonce, &challenge_pubkey);
-    let sig = signature.as_slice().try_into().map_err(|_| {
-        error!("Invalid signature length");
-        Error::InvalidChallengeSolution
-    })?;
+    let formatted = format_challenge(nonce, pubkey.as_bytes());
 
-    pubkey.verify_strict(&formatted, &sig).map_err(|_| {
+    pubkey.verify_strict(&formatted, &signature).map_err(|_| {
         error!("Challenge solution verification failed");
         Error::InvalidChallengeSolution
     })?;
@@ -184,54 +287,46 @@ async fn challenge_client(
     Ok(())
 }
 
-fn connect_error_code(err: &Error) -> ConnectErrorCode {
-    match err {
-        Error::ApproveError(ApproveError::Denied) => ConnectErrorCode::ApprovalDenied,
-        Error::ApproveError(ApproveError::Upstream(
-            router::ApprovalError::NoUserAgentsConnected,
-        )) => ConnectErrorCode::NoUserAgentsOnline,
-        _ => ConnectErrorCode::Unknown,
-    }
-}
-
-async fn authenticate(props: &mut ClientConnection) -> Result<VerifyingKey, Error> {
-    let Some(Request::AuthChallengeRequest {
-        pubkey: challenge_pubkey,
-    }) = props.transport.recv().await
-    else {
+pub async fn authenticate<T>(
+    props: &mut ClientConnection,
+    transport: &mut T,
+) -> Result<i32, Error>
+where
+    T: Bi<Inbound, Result<Outbound, Error>> + Send + ?Sized,
+{
+    let Some(Inbound::AuthChallengeRequest { pubkey, metadata }) = transport.recv().await else {
         return Err(Error::Transport);
     };
 
-    let pubkey_bytes = challenge_pubkey
-        .as_array()
-        .ok_or(Error::InvalidClientPubkeyLength)?;
-    let pubkey =
-        VerifyingKey::from_bytes(pubkey_bytes).map_err(|_| Error::InvalidAuthPubkeyEncoding)?;
-
-    let nonce = match get_nonce(&props.db, &pubkey).await? {
+    let info = match get_client_and_nonce(&props.db, &pubkey).await? {
         Some(nonce) => nonce,
         None => {
-            approve_new_client(&props.actors, pubkey).await?;
-            insert_client(&props.db, &pubkey).await?;
-            0
+            approve_new_client(
+                &props.actors,
+                ClientProfile {
+                    pubkey,
+                    metadata: metadata.clone(),
+                },
+            )
+            .await?;
+            let client_id = insert_client(&props.db, &pubkey, &metadata).await?;
+            ClientInfo {
+                id: client_id,
+                current_nonce: 0,
+            }
         }
     };
 
-    challenge_client(props, pubkey, nonce).await?;
+    sync_client_metadata(&props.db, info.id, &metadata).await?;
+    challenge_client(transport, pubkey, info.current_nonce).await?;
     
-    Ok(pubkey)
-}
+    transport
+        .send(Ok(Outbound::AuthSuccess))
+        .await
+        .map_err(|e| {
+            error!(error = ?e, "Failed to send auth success");
+            Error::Transport
+        })?;
 
-pub async fn authenticate_and_create(mut props: ClientConnection) -> Result<ClientSession, Error> {
-    match authenticate(&mut props).await {
-        Ok(_pubkey) => Ok(ClientSession::new(props)),
-        Err(err) => {
-            let code = connect_error_code(&err);
-            let _ = props
-                .transport
-                .send(Ok(Response::ClientConnectError { code }))
-                .await;
-            Err(err)
-        }
-    }
+    Ok(info.id)
 }

server/crates/arbiter-server/src/actors/client/mod.rs

@@ -1,4 +1,4 @@
-use arbiter_proto::transport::Bi;
+use arbiter_proto::{ClientMetadata, transport::Bi};
 use kameo::actor::Spawn;
 use tracing::{error, info};
 
@@ -7,53 +7,21 @@ use crate::{
     db,
 };
 
-#[derive(Debug, Clone, PartialEq, Eq, thiserror::Error)]
-pub enum ClientError {
-    #[error("Expected message with payload")]
-    MissingRequestPayload,
-    #[error("Unexpected request payload")]
-    UnexpectedRequestPayload,
-    #[error("State machine error")]
-    StateTransitionFailed,
-    #[error("Connection registration failed")]
-    ConnectionRegistrationFailed,
-    #[error(transparent)]
-    Auth(#[from] auth::Error),
+#[derive(Debug, Clone)]
+pub struct ClientProfile {
+    pub pubkey: ed25519_dalek::VerifyingKey,
+    pub metadata: ClientMetadata,
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum ConnectErrorCode {
-    Unknown,
-    ApprovalDenied,
-    NoUserAgentsOnline,
-}
-
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub enum Request {
-    AuthChallengeRequest { pubkey: Vec<u8> },
-    AuthChallengeSolution { signature: Vec<u8> },
-}
-
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub enum Response {
-    AuthChallenge { pubkey: Vec<u8>, nonce: i32 },
-    AuthOk,
-    ClientConnectError { code: ConnectErrorCode },
-}
-
-pub type Transport = Box<dyn Bi<Request, Result<Response, ClientError>> + Send>;
-
 pub struct ClientConnection {
     pub(crate) db: db::DatabasePool,
-    pub(crate) transport: Transport,
     pub(crate) actors: GlobalActors,
 }
 
 impl ClientConnection {
-    pub fn new(db: db::DatabasePool, transport: Transport, actors: GlobalActors) -> Self {
+    pub fn new(db: db::DatabasePool, actors: GlobalActors) -> Self {
         Self {
             db,
-            transport,
             actors,
         }
     }
@@ -62,13 +30,17 @@ impl ClientConnection {
 pub mod auth;
 pub mod session;
 
-pub async fn connect_client(props: ClientConnection) {
-    match auth::authenticate_and_create(props).await {
-        Ok(session) => {
-            ClientSession::spawn(session);
+pub async fn connect_client<T>(mut props: ClientConnection, transport: &mut T)
+where
+    T: Bi<auth::Inbound, Result<auth::Outbound, auth::Error>> + Send + ?Sized,
+{
+    match auth::authenticate(&mut props, transport).await {
+        Ok(client_id) => {
+            ClientSession::spawn(ClientSession::new(props, client_id));
             info!("Client authenticated, session started");
         }
         Err(err) => {
+            let _ = transport.send(Err(err.clone())).await;
             error!(?err, "Authentication failed, closing connection");
         }
     }

server/crates/arbiter-server/src/actors/client/session.rs

@@ -1,37 +1,82 @@
-use kameo::Actor;
-use tokio::select;
-use tracing::{error, info};
+use kameo::{Actor, messages};
+use tracing::error;
+
+use alloy::{consensus::TxEip1559, primitives::Address, signers::Signature};
 
 use crate::{
     actors::{
         GlobalActors,
-        client::{ClientConnection, ClientError, Request, Response},
-        router::RegisterClient,
+        client::ClientConnection, flow_coordinator::RegisterClient,
+       
+        evm::{ClientSignTransaction, SignTransactionError},
+        keyholder::KeyHolderState,
+       
     },
     db,
+    evm::VetError,
 };
 
 pub struct ClientSession {
     props: ClientConnection,
+    client_id: i32,
 }
 
 impl ClientSession {
-    pub(crate) fn new(props: ClientConnection) -> Self {
-        Self { props }
-    }
-
-    pub async fn process_transport_inbound(&mut self, req: Request) -> Output {
-        let _ = req;
-        Err(ClientError::UnexpectedRequestPayload)
+    pub(crate) fn new(props: ClientConnection, client_id: i32) -> Self {
+        Self { props, client_id }
     }
 }
 
-type Output = Result<Response, ClientError>;
+#[messages]
+impl ClientSession {
+    #[message]
+    pub(crate) async fn handle_query_vault_state(&mut self) -> Result<KeyHolderState, Error> {
+        use crate::actors::keyholder::GetState;
+
+        let vault_state = match self.props.actors.key_holder.ask(GetState {}).await {
+            Ok(state) => state,
+            Err(err) => {
+                error!(?err, actor = "client", "keyholder.query.failed");
+                return Err(Error::Internal);
+            }
+        };
+
+        Ok(vault_state)
+    }
+
+    #[message]
+    pub(crate) async fn handle_sign_transaction(
+        &mut self,
+        wallet_address: Address,
+        transaction: TxEip1559,
+    ) -> Result<Signature, SignTransactionRpcError> {
+        match self
+            .props
+            .actors
+            .evm
+            .ask(ClientSignTransaction {
+                client_id: self.client_id,
+                wallet_address,
+                transaction,
+            })
+            .await
+        {
+            Ok(signature) => Ok(signature),
+            Err(kameo::error::SendError::HandlerError(SignTransactionError::Vet(vet_error))) => {
+                Err(SignTransactionRpcError::Vet(vet_error))
+            }
+            Err(err) => {
+                error!(?err, "Failed to sign EVM transaction in client session");
+                Err(SignTransactionRpcError::Internal)
+            }
+        }
+    }
+}
 
 impl Actor for ClientSession {
     type Args = Self;
 
-    type Error = ClientError;
+    type Error = Error;
 
     async fn on_start(
         args: Self::Args,
@@ -39,55 +84,34 @@ impl Actor for ClientSession {
     ) -> Result<Self, Self::Error> {
         args.props
             .actors
-            .router
+            .flow_coordinator
             .ask(RegisterClient { actor: this })
             .await
-            .map_err(|_| ClientError::ConnectionRegistrationFailed)?;
+            .map_err(|_| Error::ConnectionRegistrationFailed)?;
         Ok(args)
     }
-
-    async fn next(
-        &mut self,
-        _actor_ref: kameo::prelude::WeakActorRef<Self>,
-        mailbox_rx: &mut kameo::prelude::MailboxReceiver<Self>,
-    ) -> Option<kameo::mailbox::Signal<Self>> {
-        loop {
-            select! {
-                signal = mailbox_rx.recv() => {
-                    return signal;
-                }
-                msg = self.props.transport.recv() => {
-                    match msg {
-                        Some(request) => {
-                            match self.process_transport_inbound(request).await {
-                                Ok(resp) => {
-                                    if self.props.transport.send(Ok(resp)).await.is_err() {
-                                        error!(actor = "client", reason = "channel closed", "send.failed");
-                                        return Some(kameo::mailbox::Signal::Stop);
-                                    }
-                                }
-                                Err(err) => {
-                                    let _ = self.props.transport.send(Err(err)).await;
-                                    return Some(kameo::mailbox::Signal::Stop);
-                                }
-                            }
-                        }
-                        None => {
-                            info!(actor = "client", "transport.closed");
-                            return Some(kameo::mailbox::Signal::Stop);
-                        }
-                    }
-                }
-            }
-        }
-    }
 }
 
 impl ClientSession {
     pub fn new_test(db: db::DatabasePool, actors: GlobalActors) -> Self {
-        use arbiter_proto::transport::DummyTransport;
-        let transport: super::Transport = Box::new(DummyTransport::new());
-        let props = ClientConnection::new(db, transport, actors);
-        Self { props }
+        let props = ClientConnection::new(db, actors);
+        Self { props, client_id: 0 }
     }
 }
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("Connection registration failed")]
+    ConnectionRegistrationFailed,
+    #[error("Internal error")]
+    Internal,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum SignTransactionRpcError {
+    #[error("Policy evaluation failed")]
+    Vet(#[from] VetError),
+
+    #[error("Internal error")]
+    Internal,
+}

server/crates/arbiter-server/src/actors/evm/mod.rs

@@ -9,12 +9,12 @@ use rand::{SeedableRng, rng, rngs::StdRng};
 use crate::{
     actors::keyholder::{CreateNew, Decrypt, KeyHolder},
     db::{
-        self, DatabasePool,
+        DatabaseError, DatabasePool,
         models::{self, SqliteTimestamp},
         schema,
     },
     evm::{
-        self, ListGrantsError, RunKind,
+        self, RunKind,
         policies::{
             FullGrant, Grant, SharedGrantSettings, SpecificGrant, SpecificMeaning,
             ether_transfer::EtherTransfer, token_transfers::TokenTransfer,
@@ -33,11 +33,7 @@ pub enum SignTransactionError {
 
     #[error("Database error: {0}")]
     #[diagnostic(code(arbiter::evm::sign::database))]
-    Database(#[from] diesel::result::Error),
-
-    #[error("Database pool error: {0}")]
-    #[diagnostic(code(arbiter::evm::sign::pool))]
-    Pool(#[from] db::PoolError),
+    Database(#[from] DatabaseError),
 
     #[error("Keyholder error: {0}")]
     #[diagnostic(code(arbiter::evm::sign::keyholder))]
@@ -68,15 +64,7 @@ pub enum Error {
 
     #[error("Database error: {0}")]
     #[diagnostic(code(arbiter::evm::database))]
-    Database(#[from] diesel::result::Error),
-
-    #[error("Database pool error: {0}")]
-    #[diagnostic(code(arbiter::evm::database_pool))]
-    DatabasePool(#[from] db::PoolError),
-
-    #[error("Grant creation error: {0}")]
-    #[diagnostic(code(arbiter::evm::creation))]
-    Creation(#[from] evm::CreationError),
+    Database(#[from] DatabaseError),
 }
 
 #[derive(Actor)]
@@ -105,7 +93,7 @@ impl EvmActor {
 #[messages]
 impl EvmActor {
     #[message]
-    pub async fn generate(&mut self) -> Result<Address, Error> {
+    pub async fn generate(&mut self) -> Result<(i32, Address), Error> {
         let (mut key_cell, address) = safe_signer::generate(&mut self.rng);
 
         let plaintext = key_cell.read_inline(|reader| SafeCell::new(reader.to_vec()));
@@ -116,29 +104,32 @@ impl EvmActor {
             .await
             .map_err(|_| Error::KeyholderSend)?;
 
-        let mut conn = self.db.get().await?;
-        insert_into(schema::evm_wallet::table)
+        let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
+        let wallet_id = insert_into(schema::evm_wallet::table)
             .values(&models::NewEvmWallet {
                 address: address.as_slice().to_vec(),
                 aead_encrypted_id: aead_id,
             })
-            .execute(&mut conn)
-            .await?;
+            .returning(schema::evm_wallet::id)
+            .get_result(&mut conn)
+            .await
+            .map_err(DatabaseError::from)?;
 
-        Ok(address)
+        Ok((wallet_id, address))
     }
 
     #[message]
-    pub async fn list_wallets(&self) -> Result<Vec<Address>, Error> {
-        let mut conn = self.db.get().await?;
+    pub async fn list_wallets(&self) -> Result<Vec<(i32, Address)>, Error> {
+        let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
         let rows: Vec<models::EvmWallet> = schema::evm_wallet::table
             .select(models::EvmWallet::as_select())
             .load(&mut conn)
-            .await?;
+            .await
+            .map_err(DatabaseError::from)?;
 
         Ok(rows
             .into_iter()
-            .map(|w| Address::from_slice(&w.address))
+            .map(|w| (w.id, Address::from_slice(&w.address)))
             .collect())
     }
 }
@@ -148,31 +139,24 @@ impl EvmActor {
     #[message]
     pub async fn useragent_create_grant(
         &mut self,
-        client_id: i32,
         basic: SharedGrantSettings,
         grant: SpecificGrant,
-    ) -> Result<i32, evm::CreationError> {
+    ) -> Result<i32, DatabaseError> {
         match grant {
             SpecificGrant::EtherTransfer(settings) => {
                 self.engine
-                    .create_grant::<EtherTransfer>(
-                        client_id,
-                        FullGrant {
+                    .create_grant::<EtherTransfer>(FullGrant {
                         basic,
                         specific: settings,
-                        },
-                    )
+                    })
                     .await
             }
             SpecificGrant::TokenTransfer(settings) => {
                 self.engine
-                    .create_grant::<TokenTransfer>(
-                        client_id,
-                        FullGrant {
+                    .create_grant::<TokenTransfer>(FullGrant {
                         basic,
                         specific: settings,
-                        },
-                    )
+                    })
                     .await
             }
         }
@@ -180,22 +164,23 @@ impl EvmActor {
 
     #[message]
     pub async fn useragent_delete_grant(&mut self, grant_id: i32) -> Result<(), Error> {
-        let mut conn = self.db.get().await?;
+        let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
         diesel::update(schema::evm_basic_grant::table)
             .filter(schema::evm_basic_grant::id.eq(grant_id))
             .set(schema::evm_basic_grant::revoked_at.eq(SqliteTimestamp::now()))
             .execute(&mut conn)
-            .await?;
+            .await
+            .map_err(DatabaseError::from)?;
         Ok(())
     }
 
     #[message]
     pub async fn useragent_list_grants(&mut self) -> Result<Vec<Grant<SpecificGrant>>, Error> {
-        match self.engine.list_all_grants().await {
-            Ok(grants) => Ok(grants),
-            Err(ListGrantsError::Database(db)) => Err(Error::Database(db)),
-            Err(ListGrantsError::Pool(pool)) => Err(Error::DatabasePool(pool)),
-        }
+        Ok(self
+            .engine
+            .list_all_grants()
+            .await
+            .map_err(DatabaseError::from)?)
     }
 
     #[message]
@@ -205,24 +190,29 @@ impl EvmActor {
         wallet_address: Address,
         transaction: TxEip1559,
     ) -> Result<SpecificMeaning, SignTransactionError> {
-        let mut conn = self.db.get().await?;
+        let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
         let wallet = schema::evm_wallet::table
             .select(models::EvmWallet::as_select())
             .filter(schema::evm_wallet::address.eq(wallet_address.as_slice()))
             .first(&mut conn)
             .await
-            .optional()?
+            .optional()
+            .map_err(DatabaseError::from)?
+            .ok_or(SignTransactionError::WalletNotFound)?;
+        let wallet_access = schema::evm_wallet_access::table
+            .select(models::EvmWalletAccess::as_select())
+            .filter(schema::evm_wallet_access::wallet_id.eq(wallet.id))
+            .filter(schema::evm_wallet_access::client_id.eq(client_id))
+            .first(&mut conn)
+            .await
+            .optional()
+            .map_err(DatabaseError::from)?
             .ok_or(SignTransactionError::WalletNotFound)?;
         drop(conn);
 
         let meaning = self
             .engine
-            .evaluate_transaction(
-                wallet.id,
-                client_id,
-                transaction.clone(),
-                RunKind::Execution,
-            )
+            .evaluate_transaction(wallet_access, transaction.clone(), RunKind::Execution)
             .await?;
 
         Ok(meaning)
@@ -235,13 +225,23 @@ impl EvmActor {
         wallet_address: Address,
         mut transaction: TxEip1559,
     ) -> Result<Signature, SignTransactionError> {
-        let mut conn = self.db.get().await?;
+        let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
         let wallet = schema::evm_wallet::table
             .select(models::EvmWallet::as_select())
             .filter(schema::evm_wallet::address.eq(wallet_address.as_slice()))
             .first(&mut conn)
             .await
-            .optional()?
+            .optional()
+            .map_err(DatabaseError::from)?
+            .ok_or(SignTransactionError::WalletNotFound)?;
+        let wallet_access = schema::evm_wallet_access::table
+            .select(models::EvmWalletAccess::as_select())
+            .filter(schema::evm_wallet_access::wallet_id.eq(wallet.id))
+            .filter(schema::evm_wallet_access::client_id.eq(client_id))
+            .first(&mut conn)
+            .await
+            .optional()
+            .map_err(DatabaseError::from)?
             .ok_or(SignTransactionError::WalletNotFound)?;
         drop(conn);
 
@@ -256,12 +256,7 @@ impl EvmActor {
         let signer = safe_signer::SafeSigner::from_cell(raw_key)?;
 
         self.engine
-            .evaluate_transaction(
-                wallet.id,
-                client_id,
-                transaction.clone(),
-                RunKind::Execution,
-            )
+            .evaluate_transaction(wallet_access, transaction.clone(), RunKind::Execution)
             .await?;
 
         use alloy::network::TxSignerSync as _;

server/crates/arbiter-server/src/actors/flow_coordinator/client_connect_approval.rs

@@ -0,0 +1,101 @@
+use std::ops::ControlFlow;
+
+use kameo::{
+    Actor, messages,
+    prelude::{ActorId, ActorRef, ActorStopReason, Context, WeakActorRef},
+    reply::ReplySender,
+};
+
+use crate::actors::{
+    client::ClientProfile,
+    flow_coordinator::ApprovalError,
+    user_agent::{UserAgentSession, session::BeginNewClientApproval},
+};
+
+pub struct Args {
+    pub client: ClientProfile,
+    pub user_agents: Vec<ActorRef<UserAgentSession>>,
+    pub reply: ReplySender<Result<bool, ApprovalError>>
+}
+
+pub struct ClientApprovalController {
+    /// Number of UAs that have not yet responded (approval or denial) or died.
+    pending: usize,
+    /// Number of approvals received so far.
+    approved: usize,
+    reply: Option<ReplySender<Result<bool, ApprovalError>>>,
+}
+
+impl ClientApprovalController {
+    fn send_reply(&mut self, result: Result<bool, ApprovalError>) {
+        if let Some(reply) = self.reply.take() {
+            reply.send(result);
+        }
+    }
+}
+
+impl Actor for ClientApprovalController {
+    type Args = Args;
+    type Error = ();
+
+    async fn on_start(
+        Args { client, mut user_agents, reply }: Self::Args,
+        actor_ref: ActorRef<Self>,
+    ) -> Result<Self, Self::Error> {
+        let this = Self {
+            pending: user_agents.len(),
+            approved: 0,
+            reply: Some(reply),
+        };
+
+        for user_agent in user_agents.drain(..) {
+            actor_ref.link(&user_agent).await;
+            let _ = user_agent
+                .tell(BeginNewClientApproval {
+                    client: client.clone(),
+                    controller: actor_ref.clone(),
+                })
+                .await;
+        }
+
+        Ok(this)
+    }
+
+    async fn on_link_died(
+        &mut self,
+        _: WeakActorRef<Self>,
+        _: ActorId,
+        _: ActorStopReason,
+    ) -> Result<ControlFlow<ActorStopReason>, Self::Error> {
+        // A linked UA died before responding — counts as a non-approval.
+        self.pending = self.pending.saturating_sub(1);
+        if self.pending == 0 {
+            // At least one UA didn't approve: deny.
+            self.send_reply(Ok(false));
+            return Ok(ControlFlow::Break(ActorStopReason::Normal));
+        }
+        Ok(ControlFlow::Continue(()))
+    }
+}
+
+#[messages]
+impl ClientApprovalController {
+    #[message(ctx)]
+    pub async fn client_approval_answer(&mut self, approved: bool, ctx: &mut Context<Self, ()>) {
+        if !approved {
+            // Denial wins immediately regardless of other pending responses.
+            self.send_reply(Ok(false));
+            ctx.stop();
+            return;
+        }
+
+        self.approved += 1;
+        self.pending = self.pending.saturating_sub(1);
+
+        if self.pending == 0 {
+            // Every connected UA approved.
+            self.send_reply(Ok(true));
+            ctx.stop();
+        }
+    }
+}

server/crates/arbiter-server/src/actors/flow_coordinator/mod.rs

@@ -0,0 +1,118 @@
+use std::{collections::HashMap, ops::ControlFlow};
+
+use kameo::{
+    Actor,
+    actor::{ActorId, ActorRef, Spawn},
+    messages,
+    prelude::{ActorStopReason, Context, WeakActorRef},
+    reply::DelegatedReply,
+};
+use tracing::info;
+
+use crate::actors::{
+    client::{ClientProfile, session::ClientSession},
+    flow_coordinator::client_connect_approval::ClientApprovalController,
+    user_agent::session::UserAgentSession,
+};
+
+pub mod client_connect_approval;
+
+#[derive(Default)]
+pub struct FlowCoordinator {
+    pub user_agents: HashMap<ActorId, ActorRef<UserAgentSession>>,
+    pub clients: HashMap<ActorId, ActorRef<ClientSession>>,
+}
+
+impl Actor for FlowCoordinator {
+    type Args = Self;
+
+    type Error = ();
+
+    async fn on_start(args: Self::Args, _: ActorRef<Self>) -> Result<Self, Self::Error> {
+        Ok(args)
+    }
+
+    async fn on_link_died(
+        &mut self,
+        _: WeakActorRef<Self>,
+        id: ActorId,
+        _: ActorStopReason,
+    ) -> Result<ControlFlow<ActorStopReason>, Self::Error> {
+        if self.user_agents.remove(&id).is_some() {
+            info!(
+                ?id,
+                actor = "FlowCoordinator",
+                event = "useragent.disconnected"
+            );
+        } else if self.clients.remove(&id).is_some() {
+            info!(
+                ?id,
+                actor = "FlowCoordinator",
+                event = "client.disconnected"
+            );
+        } else {
+            info!(
+                ?id,
+                actor = "FlowCoordinator",
+                event = "unknown.actor.disconnected"
+            );
+        }
+        Ok(ControlFlow::Continue(()))
+    }
+}
+
+#[derive(Debug, thiserror::Error, Clone, PartialEq, Eq, Hash)]
+pub enum ApprovalError {
+    #[error("No user agents connected")]
+    NoUserAgentsConnected,
+}
+
+#[messages]
+impl FlowCoordinator {
+    #[message(ctx)]
+    pub async fn register_user_agent(
+        &mut self,
+        actor: ActorRef<UserAgentSession>,
+        ctx: &mut Context<Self, ()>,
+    ) {
+        info!(id = %actor.id(), actor = "FlowCoordinator", event = "useragent.connected");
+        ctx.actor_ref().link(&actor).await;
+        self.user_agents.insert(actor.id(), actor);
+    }
+
+    #[message(ctx)]
+    pub async fn register_client(
+        &mut self,
+        actor: ActorRef<ClientSession>,
+        ctx: &mut Context<Self, ()>,
+    ) {
+        info!(id = %actor.id(), actor = "FlowCoordinator", event = "client.connected");
+        ctx.actor_ref().link(&actor).await;
+        self.clients.insert(actor.id(), actor);
+    }
+
+    #[message(ctx)]
+    pub async fn request_client_approval(
+        &mut self,
+        client: ClientProfile,
+        ctx: &mut Context<Self, DelegatedReply<Result<bool, ApprovalError>>>,
+    ) -> DelegatedReply<Result<bool, ApprovalError>> {
+        let (reply, Some(reply_sender)) = ctx.reply_sender() else {
+            unreachable!("Expected `request_client_approval` to have callback channel");
+        };
+
+        let refs: Vec<_> = self.user_agents.values().cloned().collect();
+        if refs.is_empty() {
+            reply_sender.send(Err(ApprovalError::NoUserAgentsConnected));
+            return reply;
+        }
+
+        ClientApprovalController::spawn(client_connect_approval::Args {
+            client,
+            user_agents: refs,
+            reply: reply_sender,
+        });
+
+        reply
+    }
+}

server/crates/arbiter-server/src/actors/keyholder/mod.rs

@@ -22,7 +22,7 @@ use encryption::v1::{self, KeyCell, Nonce};
 pub mod encryption;
 
 #[derive(Default, EnumDiscriminants)]
-#[strum_discriminants(derive(Reply), vis(pub))]
+#[strum_discriminants(derive(Reply), vis(pub), name(KeyHolderState))]
 enum State {
     #[default]
     Unbootstrapped,
@@ -214,7 +214,6 @@ impl KeyHolder {
             let mut conn = self.db.get().await?;
             schema::root_key_history::table
                 .filter(schema::root_key_history::id.eq(*root_key_history_id))
-                .select(schema::root_key_history::data_encryption_nonce)
                 .select(RootKeyHistory::as_select())
                 .first(&mut conn)
                 .await?
@@ -325,7 +324,7 @@ impl KeyHolder {
     }
 
     #[message]
-    pub fn get_state(&self) -> StateDiscriminants {
+    pub fn get_state(&self) -> KeyHolderState {
         self.state.discriminant()
     }
 

server/crates/arbiter-server/src/actors/mod.rs

@@ -3,15 +3,18 @@ use miette::Diagnostic;
 use thiserror::Error;
 
 use crate::{
-    actors::{bootstrap::Bootstrapper, evm::EvmActor, keyholder::KeyHolder, router::MessageRouter},
+    actors::{
+        bootstrap::Bootstrapper, evm::EvmActor, flow_coordinator::FlowCoordinator,
+        keyholder::KeyHolder,
+    },
     db,
 };
 
 pub mod bootstrap;
 pub mod client;
 mod evm;
+pub mod flow_coordinator;
 pub mod keyholder;
-pub mod router;
 pub mod user_agent;
 
 #[derive(Error, Debug, Diagnostic)]
@@ -30,7 +33,7 @@ pub enum SpawnError {
 pub struct GlobalActors {
     pub key_holder: ActorRef<KeyHolder>,
     pub bootstrapper: ActorRef<Bootstrapper>,
-    pub router: ActorRef<MessageRouter>,
+    pub flow_coordinator: ActorRef<FlowCoordinator>,
     pub evm: ActorRef<EvmActor>,
 }
 
@@ -41,7 +44,7 @@ impl GlobalActors {
             bootstrapper: Bootstrapper::spawn(Bootstrapper::new(&db).await?),
             evm: EvmActor::spawn(EvmActor::new(key_holder.clone(), db)),
             key_holder,
-            router: MessageRouter::spawn(MessageRouter::default()),
+            flow_coordinator: FlowCoordinator::spawn(FlowCoordinator::default()),
         })
     }
 }

server/crates/arbiter-server/src/actors/router/mod.rs

@@ -1,174 +0,0 @@
-use std::{collections::HashMap, ops::ControlFlow};
-
-use ed25519_dalek::VerifyingKey;
-use kameo::{
-    Actor,
-    actor::{ActorId, ActorRef},
-    messages,
-    prelude::{ActorStopReason, Context, WeakActorRef},
-    reply::DelegatedReply,
-};
-use tokio::{sync::watch, task::JoinSet};
-use tracing::{info, warn};
-
-use crate::actors::{
-    client::session::ClientSession,
-    user_agent::session::{RequestNewClientApproval, UserAgentSession},
-};
-
-#[derive(Default)]
-pub struct MessageRouter {
-    pub user_agents: HashMap<ActorId, ActorRef<UserAgentSession>>,
-    pub clients: HashMap<ActorId, ActorRef<ClientSession>>,
-}
-
-impl Actor for MessageRouter {
-    type Args = Self;
-
-    type Error = ();
-
-    async fn on_start(args: Self::Args, _: ActorRef<Self>) -> Result<Self, Self::Error> {
-        Ok(args)
-    }
-
-    async fn on_link_died(
-        &mut self,
-        _: WeakActorRef<Self>,
-        id: ActorId,
-        _: ActorStopReason,
-    ) -> Result<ControlFlow<ActorStopReason>, Self::Error> {
-        if self.user_agents.remove(&id).is_some() {
-            info!(
-                ?id,
-                actor = "MessageRouter",
-                event = "useragent.disconnected"
-            );
-        } else if self.clients.remove(&id).is_some() {
-            info!(?id, actor = "MessageRouter", event = "client.disconnected");
-        } else {
-            info!(
-                ?id,
-                actor = "MessageRouter",
-                event = "unknown.actor.disconnected"
-            );
-        }
-        Ok(ControlFlow::Continue(()))
-    }
-}
-
-#[derive(Debug, thiserror::Error, Clone, PartialEq, Eq, Hash)]
-pub enum ApprovalError {
-    #[error("No user agents connected")]
-    NoUserAgentsConnected,
-}
-
-async fn request_client_approval(
-    user_agents: &[WeakActorRef<UserAgentSession>],
-    client_pubkey: VerifyingKey,
-) -> Result<bool, ApprovalError> {
-    if user_agents.is_empty() {
-        return Err(ApprovalError::NoUserAgentsConnected);
-    }
-
-    let mut pool = JoinSet::new();
-    let (cancel_tx, cancel_rx) = watch::channel(());
-
-    for weak_ref in user_agents {
-        match weak_ref.upgrade() {
-            Some(agent) => {
-                let cancel_rx = cancel_rx.clone();
-                pool.spawn(async move {
-                    agent
-                        .ask(RequestNewClientApproval {
-                            client_pubkey,
-                            cancel_flag: cancel_rx.clone(),
-                        })
-                        .await
-                });
-            }
-            None => {
-                warn!(
-                    id = weak_ref.id().to_string(),
-                    actor = "MessageRouter",
-                    event = "useragent.disconnected_before_approval"
-                );
-            }
-        }
-    }
-
-    while let Some(result) = pool.join_next().await {
-        match result {
-            Ok(Ok(approved)) => {
-                // cancel other pending requests
-                let _ = cancel_tx.send(());
-                return Ok(approved);
-            }
-            Ok(Err(err)) => {
-                warn!(
-                    ?err,
-                    actor = "MessageRouter",
-                    event = "useragent.approval_error"
-                );
-            }
-            Err(err) => {
-                warn!(
-                    ?err,
-                    actor = "MessageRouter",
-                    event = "useragent.approval_task_failed"
-                );
-            }
-        }
-    }
-
-    Err(ApprovalError::NoUserAgentsConnected)
-}
-
-#[messages]
-impl MessageRouter {
-    #[message(ctx)]
-    pub async fn register_user_agent(
-        &mut self,
-        actor: ActorRef<UserAgentSession>,
-        ctx: &mut Context<Self, ()>,
-    ) {
-        info!(id = %actor.id(), actor = "MessageRouter", event = "useragent.connected");
-        ctx.actor_ref().link(&actor).await;
-        self.user_agents.insert(actor.id(), actor);
-    }
-
-    #[message(ctx)]
-    pub async fn register_client(
-        &mut self,
-        actor: ActorRef<ClientSession>,
-        ctx: &mut Context<Self, ()>,
-    ) {
-        info!(id = %actor.id(), actor = "MessageRouter", event = "client.connected");
-        ctx.actor_ref().link(&actor).await;
-        self.clients.insert(actor.id(), actor);
-    }
-
-    #[message(ctx)]
-    pub async fn request_client_approval(
-        &mut self,
-        client_pubkey: VerifyingKey,
-        ctx: &mut Context<Self, DelegatedReply<Result<bool, ApprovalError>>>,
-    ) -> DelegatedReply<Result<bool, ApprovalError>> {
-        let (reply, Some(reply_sender)) = ctx.reply_sender() else {
-            unreachable!("Expected `request_client_approval` to have callback channel");
-        };
-
-        let weak_refs = self
-            .user_agents
-            .values()
-            .map(|agent| agent.downgrade())
-            .collect::<Vec<_>>();
-
-        // handle in subtask to not to lock the actor
-        tokio::task::spawn(async move {
-            let result = request_client_approval(&weak_refs, client_pubkey).await;
-            reply_sender.send(result);
-        });
-
-        reply
-    }
-}

server/crates/arbiter-server/src/actors/user_agent/auth.rs

@@ -1,74 +1,82 @@
+use arbiter_proto::transport::Bi;
 use tracing::error;
 
 use crate::actors::user_agent::{
-    Request, UserAgentConnection,
+    AuthPublicKey, UserAgentConnection,
     auth::state::{AuthContext, AuthStateMachine},
-    AuthPublicKey,
-    session::UserAgentSession,
 };
 
-#[derive(thiserror::Error, Debug, PartialEq)]
-pub enum Error {
-    #[error("Unexpected message payload")]
-    UnexpectedMessagePayload,
-    #[error("Invalid client public key length")]
-    InvalidClientPubkeyLength,
-    #[error("Invalid client public key encoding")]
-    InvalidAuthPubkeyEncoding,
-    #[error("Database pool unavailable")]
-    DatabasePoolUnavailable,
-    #[error("Database operation failed")]
-    DatabaseOperationFailed,
-    #[error("Public key not registered")]
-    PublicKeyNotRegistered,
-    #[error("Transport error")]
-    Transport,
-    #[error("Invalid bootstrap token")]
-    InvalidBootstrapToken,
-    #[error("Bootstrapper actor unreachable")]
-    BootstrapperActorUnreachable,
-    #[error("Invalid challenge solution")]
-    InvalidChallengeSolution,
-}
-
 mod state;
 use state::*;
 
-fn parse_auth_event(payload: Request) -> Result<AuthEvents, Error> {
-    match payload {
-        Request::AuthChallengeRequest {
-            pubkey,
-            bootstrap_token: None,
-        } => Ok(AuthEvents::AuthRequest(ChallengeRequest { pubkey })),
-        Request::AuthChallengeRequest {
-            pubkey,
-            bootstrap_token: Some(token),
-        } => Ok(AuthEvents::BootstrapAuthRequest(BootstrapAuthRequest {
-            pubkey,
-            token,
-        })),
-        Request::AuthChallengeSolution { signature } => {
-            Ok(AuthEvents::ReceivedSolution(ChallengeSolution {
-                solution: signature,
-            }))
+#[derive(Debug, Clone)]
+pub enum Inbound {
+    AuthChallengeRequest {
+        pubkey: AuthPublicKey,
+        bootstrap_token: Option<String>,
+    },
+    AuthChallengeSolution {
+        signature: Vec<u8>,
+    },
+}
+
+#[derive(Debug)]
+pub enum Error {
+    UnregisteredPublicKey,
+    InvalidChallengeSolution,
+    InvalidBootstrapToken,
+    Internal { details: String },
+    Transport,
+}
+
+impl Error {
+    fn internal(details: impl Into<String>) -> Self {
+        Self::Internal {
+            details: details.into(),
         }
-        _ => Err(Error::UnexpectedMessagePayload),
     }
 }
 
-pub async fn authenticate(props: &mut UserAgentConnection) -> Result<AuthPublicKey, Error> {
-    let mut state = AuthStateMachine::new(AuthContext::new(props));
+#[derive(Debug, Clone)]
+pub enum Outbound {
+    AuthChallenge { nonce: i32 },
+    AuthSuccess,
+}
+
+fn parse_auth_event(payload: Inbound) -> AuthEvents {
+    match payload {
+        Inbound::AuthChallengeRequest {
+            pubkey,
+            bootstrap_token: None,
+        } => AuthEvents::AuthRequest(ChallengeRequest { pubkey }),
+        Inbound::AuthChallengeRequest {
+            pubkey,
+            bootstrap_token: Some(token),
+        } => AuthEvents::BootstrapAuthRequest(BootstrapAuthRequest { pubkey, token }),
+        Inbound::AuthChallengeSolution { signature } => {
+            AuthEvents::ReceivedSolution(ChallengeSolution {
+                solution: signature,
+            })
+        }
+    }
+}
+
+pub async fn authenticate<T>(
+    props: &mut UserAgentConnection,
+    transport: T,
+) -> Result<AuthPublicKey, Error>
+where
+    T: Bi<Inbound, Result<Outbound, Error>> + Send,
+{
+    let mut state = AuthStateMachine::new(AuthContext::new(props, transport));
 
     loop {
         // `state` holds a mutable reference to `props` so we can't access it directly here
-        let transport = state.context_mut().conn.transport.as_mut();
-        let Some(payload) = transport.recv().await else {
+        let Some(payload) = state.context_mut().transport.recv().await else {
             return Err(Error::Transport);
         };
 
-        let event = parse_auth_event(payload)?;
-
-        match state.process_event(event).await {
+        match state.process_event(parse_auth_event(payload)).await {
             Ok(AuthStates::AuthOk(key)) => return Ok(key.clone()),
             Err(AuthError::ActionFailed(err)) => {
                 error!(?err, "State machine action failed");
@@ -91,11 +99,3 @@ pub async fn authenticate(props: &mut UserAgentConnection) -> Result<AuthPublicK
         }
     }
 }
-
-pub async fn authenticate_and_create(
-    mut props: UserAgentConnection,
-) -> Result<UserAgentSession, Error> {
-    let _key = authenticate(&mut props).await?;
-    let session = UserAgentSession::new(props);
-    Ok(session)
-}

server/crates/arbiter-server/src/actors/user_agent/auth/state.rs

@@ -1,3 +1,4 @@
+use arbiter_proto::transport::Bi;
 use diesel::{ExpressionMethods as _, OptionalExtension as _, QueryDsl, update};
 use diesel_async::RunQueryDsl;
 use tracing::error;
@@ -6,7 +7,7 @@ use super::Error;
 use crate::{
     actors::{
         bootstrap::ConsumeToken,
-        user_agent::{AuthPublicKey, Response, UserAgentConnection},
+        user_agent::{AuthPublicKey, UserAgentConnection, auth::Outbound},
     },
     db::schema,
 };
@@ -42,7 +43,7 @@ smlang::statemachine!(
 async fn create_nonce(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Result<i32, Error> {
     let mut db_conn = db.get().await.map_err(|e| {
         error!(error = ?e, "Database pool error");
-        Error::DatabasePoolUnavailable
+        Error::internal("Database unavailable")
     })?;
     db_conn
         .exclusive_transaction(|conn| {
@@ -66,11 +67,11 @@ async fn create_nonce(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Resu
         .optional()
         .map_err(|e| {
             error!(error = ?e, "Database error");
-            Error::DatabaseOperationFailed
+            Error::internal("Database operation failed")
         })?
         .ok_or_else(|| {
             error!(?pubkey_bytes, "Public key not found in database");
-            Error::PublicKeyNotRegistered
+            Error::UnregisteredPublicKey
         })
 }
 
@@ -79,7 +80,7 @@ async fn register_key(db: &crate::db::DatabasePool, pubkey: &AuthPublicKey) -> R
     let key_type = pubkey.key_type();
     let mut conn = db.get().await.map_err(|e| {
         error!(error = ?e, "Database pool error");
-        Error::DatabasePoolUnavailable
+        Error::internal("Database unavailable")
     })?;
 
     diesel::insert_into(schema::useragent_client::table)
@@ -92,23 +93,27 @@ async fn register_key(db: &crate::db::DatabasePool, pubkey: &AuthPublicKey) -> R
         .await
         .map_err(|e| {
             error!(error = ?e, "Database error");
-            Error::DatabaseOperationFailed
+            Error::internal("Database operation failed")
         })?;
 
     Ok(())
 }
 
-pub struct AuthContext<'a> {
+pub struct AuthContext<'a, T> {
     pub(super) conn: &'a mut UserAgentConnection,
+    pub(super) transport: T,
 }
 
-impl<'a> AuthContext<'a> {
-    pub fn new(conn: &'a mut UserAgentConnection) -> Self {
-        Self { conn }
+impl<'a, T> AuthContext<'a, T> {
+    pub fn new(conn: &'a mut UserAgentConnection, transport: T) -> Self {
+        Self { conn, transport }
     }
 }
 
-impl AuthStateMachineContext for AuthContext<'_> {
+impl<T> AuthStateMachineContext for AuthContext<'_, T>
+where
+    T: Bi<super::Inbound, Result<super::Outbound, Error>> + Send,
+{
     type Error = Error;
 
     async fn prepare_challenge(
@@ -118,9 +123,8 @@ impl AuthStateMachineContext for AuthContext<'_> {
         let stored_bytes = pubkey.to_stored_bytes();
         let nonce = create_nonce(&self.conn.db, &stored_bytes).await?;
 
-        self.conn
-            .transport
-            .send(Ok(Response::AuthChallenge { nonce }))
+        self.transport
+            .send(Ok(Outbound::AuthChallenge { nonce }))
             .await
             .map_err(|e| {
                 error!(?e, "Failed to send auth challenge");
@@ -149,7 +153,7 @@ impl AuthStateMachineContext for AuthContext<'_> {
             .await
             .map_err(|e| {
                 error!(?e, "Failed to consume bootstrap token");
-                Error::BootstrapperActorUnreachable
+                Error::internal("Failed to consume bootstrap token")
             })?;
 
         if !token_ok {
@@ -159,9 +163,8 @@ impl AuthStateMachineContext for AuthContext<'_> {
 
         register_key(&self.conn.db, &pubkey).await?;
 
-        self.conn
-                .transport
-                .send(Ok(Response::AuthOk))
+        self.transport
+            .send(Ok(Outbound::AuthSuccess))
             .await
             .map_err(|_| Error::Transport)?;
 
@@ -172,7 +175,10 @@ impl AuthStateMachineContext for AuthContext<'_> {
     #[allow(clippy::unused_unit)]
     async fn verify_solution(
         &mut self,
-        ChallengeContext { challenge_nonce, key }: &ChallengeContext,
+        ChallengeContext {
+            challenge_nonce,
+            key,
+        }: &ChallengeContext,
         ChallengeSolution { solution }: ChallengeSolution,
     ) -> Result<AuthPublicKey, Self::Error> {
         let formatted = arbiter_proto::format_challenge(*challenge_nonce, &key.to_stored_bytes());
@@ -204,13 +210,15 @@ impl AuthStateMachineContext for AuthContext<'_> {
             }
         };
 
-        if valid {
-            self.conn
-                .transport
-                .send(Ok(Response::AuthOk))
+        if !valid {
+            error!("Invalid challenge solution signature");
+            return Err(Error::InvalidChallengeSolution);
+        }
+
+        self.transport
+            .send(Ok(Outbound::AuthSuccess))
             .await
             .map_err(|_| Error::Transport)?;
-        }
 
         Ok(key.clone())
     }

server/crates/arbiter-server/src/actors/user_agent/mod.rs

@@ -1,33 +1,8 @@
-use alloy::primitives::Address;
-use arbiter_proto::transport::Bi;
-use kameo::actor::Spawn as _;
-use tracing::{error, info};
-
 use crate::{
-    actors::{GlobalActors, evm, user_agent::session::UserAgentSession},
+    actors::{GlobalActors, client::ClientProfile},
     db::{self, models::KeyType},
-    evm::policies::SharedGrantSettings,
-    evm::policies::{Grant, SpecificGrant},
 };
 
-#[derive(Debug, thiserror::Error, PartialEq)]
-pub enum TransportResponseError {
-    #[error("Unexpected request payload")]
-    UnexpectedRequestPayload,
-    #[error("Invalid state for unseal encrypted key")]
-    InvalidStateForUnsealEncryptedKey,
-    #[error("client_pubkey must be 32 bytes")]
-    InvalidClientPubkeyLength,
-    #[error("State machine error")]
-    StateTransitionFailed,
-    #[error("Vault is not available")]
-    KeyHolderActorUnreachable,
-    #[error(transparent)]
-    Auth(#[from] auth::Error),
-    #[error("Failed registering connection")]
-    ConnectionRegistrationFailed,
-}
-
 /// Abstraction over Ed25519 / ECDSA-secp256k1 / RSA public keys used during the auth handshake.
 #[derive(Clone, Debug)]
 pub enum AuthPublicKey {
@@ -65,119 +40,55 @@ impl AuthPublicKey {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum UnsealError {
-    InvalidKey,
-    Unbootstrapped,
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum BootstrapError {
-    AlreadyBootstrapped,
-    InvalidKey,
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum VaultState {
-    Unbootstrapped,
-    Sealed,
-    Unsealed,
-}
-
-#[derive(Debug, Clone)]
-pub enum Request {
-    AuthChallengeRequest {
-        pubkey: AuthPublicKey,
-        bootstrap_token: Option<String>,
-    },
-    AuthChallengeSolution {
-        signature: Vec<u8>,
-    },
-    UnsealStart {
-        client_pubkey: x25519_dalek::PublicKey,
-    },
-    UnsealEncryptedKey {
-        nonce: Vec<u8>,
-        ciphertext: Vec<u8>,
-        associated_data: Vec<u8>,
-    },
-    BootstrapEncryptedKey {
-        nonce: Vec<u8>,
-        ciphertext: Vec<u8>,
-        associated_data: Vec<u8>,
-    },
-    QueryVaultState,
-    EvmWalletCreate,
-    EvmWalletList,
-    ClientConnectionResponse {
-        approved: bool,
-    },
-
-    ListGrants,
-    EvmGrantCreate {
-        client_id: i32,
-        shared: SharedGrantSettings,
-        specific: SpecificGrant,
-    },
-    EvmGrantDelete {
-        grant_id: i32,
-    },
+impl TryFrom<(KeyType, Vec<u8>)> for AuthPublicKey {
+    type Error = &'static str;
+
+    fn try_from(value: (KeyType, Vec<u8>)) -> Result<Self, Self::Error> {
+        let (key_type, bytes) = value;
+        match key_type {
+            KeyType::Ed25519 => {
+                let bytes: [u8; 32] = bytes.try_into().map_err(|_| "invalid Ed25519 key length")?;
+                let key = ed25519_dalek::VerifyingKey::from_bytes(&bytes)
+                    .map_err(|_e| "invalid Ed25519 key")?;
+                Ok(AuthPublicKey::Ed25519(key))
+            }
+            KeyType::EcdsaSecp256k1 => {
+                let point =
+                    k256::EncodedPoint::from_bytes(&bytes).map_err(|_e| "invalid ECDSA key")?;
+                let key = k256::ecdsa::VerifyingKey::from_encoded_point(&point)
+                    .map_err(|_e| "invalid ECDSA key")?;
+                Ok(AuthPublicKey::EcdsaSecp256k1(key))
+            }
+            KeyType::Rsa => {
+                use rsa::pkcs8::DecodePublicKey as _;
+                let key = rsa::RsaPublicKey::from_public_key_der(&bytes)
+                    .map_err(|_e| "invalid RSA key")?;
+                Ok(AuthPublicKey::Rsa(key))
+            }
+        }
+    }
 }
 
+// Messages, sent by user agent to connection client without having a request
 #[derive(Debug)]
-pub enum Response {
-    AuthChallenge {
-        nonce: i32,
-    },
-    AuthOk,
-    UnsealStartResponse {
-        server_pubkey: x25519_dalek::PublicKey,
-    },
-    UnsealResult(Result<(), UnsealError>),
-    BootstrapResult(Result<(), BootstrapError>),
-    VaultState(VaultState),
-    ClientConnectionRequest {
-        pubkey: ed25519_dalek::VerifyingKey,
-    },
-    ClientConnectionCancel,
-    EvmWalletCreate(Result<(), evm::Error>),
-    EvmWalletList(Vec<Address>),
-
-    ListGrants(Vec<Grant<SpecificGrant>>),
-    EvmGrantCreate(Result<i32, evm::Error>),
-    EvmGrantDelete(Result<(), evm::Error>),
+pub enum OutOfBand {
+    ClientConnectionRequest { profile: ClientProfile },
+    ClientConnectionCancel { pubkey: ed25519_dalek::VerifyingKey },
 }
 
-pub type Transport = Box<dyn Bi<Request, Result<Response, TransportResponseError>> + Send>;
-
 pub struct UserAgentConnection {
-    db: db::DatabasePool,
-    actors: GlobalActors,
-    transport: Transport,
+    pub(crate) db: db::DatabasePool,
+    pub(crate) actors: GlobalActors,
 }
 
 impl UserAgentConnection {
-    pub fn new(db: db::DatabasePool, actors: GlobalActors, transport: Transport) -> Self {
-        Self {
-            db,
-            actors,
-            transport,
-        }
+    pub fn new(db: db::DatabasePool, actors: GlobalActors) -> Self {
+        Self { db, actors }
     }
 }
 
 pub mod auth;
 pub mod session;
 
-#[tracing::instrument(skip(props))]
-pub async fn connect_user_agent(props: UserAgentConnection) {
-    match auth::authenticate_and_create(props).await {
-        Ok(session) => {
-            UserAgentSession::spawn(session);
-            info!("User authenticated, session started");
-        }
-        Err(err) => {
-            error!(?err, "Authentication failed, closing connection");
-        }
-    }
-}
+pub use auth::authenticate;
+pub use session::UserAgentSession;

server/crates/arbiter-server/src/actors/user_agent/session.rs

@@ -1,93 +1,95 @@
+use std::{borrow::Cow, collections::HashMap};
+
+use arbiter_proto::transport::Sender;
+use async_trait::async_trait;
 use ed25519_dalek::VerifyingKey;
-use kameo::{Actor, messages, prelude::Context};
-use tokio::{select, sync::watch};
-use tracing::{error, info};
+use kameo::{Actor, actor::ActorRef, messages};
+use thiserror::Error;
+use tracing::error;
 
 use crate::actors::{
-    router::RegisterUserAgent,
-    user_agent::{
-        Request, Response, TransportResponseError,
-        UserAgentConnection,
-    },
+    client::ClientProfile,
+    flow_coordinator::{RegisterUserAgent, client_connect_approval::ClientApprovalController},
+    user_agent::{OutOfBand, UserAgentConnection},
 };
 
 mod state;
 use state::{DummyContext, UserAgentEvents, UserAgentStateMachine};
 
-// Error for consumption by other actors
-#[derive(Debug, thiserror::Error, PartialEq)]
+#[derive(Debug, Error)]
 pub enum Error {
-    #[error("User agent session ended due to connection loss")]
-    ConnectionLost,
+    #[error("State transition failed")]
+    State,
 
-    #[error("User agent session ended due to unexpected message")]
-    UnexpectedMessage,
+    #[error("Internal error: {message}")]
+    Internal { message: Cow<'static, str> },
+}
+
+impl From<crate::db::PoolError> for Error {
+    fn from(err: crate::db::PoolError) -> Self {
+        error!(?err, "Database pool error");
+        Self::internal("Database pool error")
+    }
+}
+impl From<diesel::result::Error> for Error {
+    fn from(err: diesel::result::Error) -> Self {
+        error!(?err, "Database error");
+        Self::internal("Database error")
+    }
+}
+
+impl Error {
+    pub fn internal(message: impl Into<Cow<'static, str>>) -> Self {
+        Self::Internal {
+            message: message.into(),
+        }
+    }
+}
+
+pub struct PendingClientApproval {
+    controller: ActorRef<ClientApprovalController>,
 }
 
 pub struct UserAgentSession {
     props: UserAgentConnection,
     state: UserAgentStateMachine<DummyContext>,
+    sender: Box<dyn Sender<OutOfBand>>,
+
+    pending_client_approvals: HashMap<VerifyingKey, PendingClientApproval>,
 }
 
-mod connection;
+pub mod connection;
 
 impl UserAgentSession {
-    pub(crate) fn new(props: UserAgentConnection) -> Self {
+    pub(crate) fn new(props: UserAgentConnection, sender: Box<dyn Sender<OutOfBand>>) -> Self {
         Self {
             props,
             state: UserAgentStateMachine::new(DummyContext),
+            sender,
+            pending_client_approvals: Default::default(),
         }
     }
 
-    pub(super) async fn send_msg<Reply: kameo::Reply>(
+    pub fn new_test(db: crate::db::DatabasePool, actors: crate::actors::GlobalActors) -> Self {
+        struct DummySender;
+
+        #[async_trait]
+        impl Sender<OutOfBand> for DummySender {
+            async fn send(
                 &mut self,
-        msg: Response,
-        _ctx: &mut Context<Self, Reply>,
-    ) -> Result<(), Error> {
-        self.props.transport.send(Ok(msg)).await.map_err(|_| {
-            error!(
-                actor = "useragent",
-                reason = "channel closed",
-                "send.failed"
-            );
-            Error::ConnectionLost
-        })
+                _item: OutOfBand,
+            ) -> Result<(), arbiter_proto::transport::Error> {
+                Ok(())
+            }
         }
 
-    async fn expect_msg<Extractor, Msg, Reply>(
-        &mut self,
-        extractor: Extractor,
-        ctx: &mut Context<Self, Reply>,
-    ) -> Result<Msg, Error>
-    where
-        Extractor: FnOnce(Request) -> Option<Msg>,
-        Reply: kameo::Reply,
-    {
-        let msg = self.props.transport.recv().await.ok_or_else(|| {
-            error!(
-                actor = "useragent",
-                reason = "channel closed",
-                "recv.failed"
-            );
-            ctx.stop();
-            Error::ConnectionLost
-        })?;
-
-        extractor(msg).ok_or_else(|| {
-            error!(
-                actor = "useragent",
-                reason = "unexpected message",
-                "recv.failed"
-            );
-            ctx.stop();
-            Error::UnexpectedMessage
-        })
+        Self::new(UserAgentConnection::new(db, actors), Box::new(DummySender))
     }
 
-    fn transition(&mut self, event: UserAgentEvents) -> Result<(), TransportResponseError> {
+    fn transition(&mut self, event: UserAgentEvents) -> Result<(), Error> {
         self.state.process_event(event).map_err(|e| {
             error!(?e, "State transition failed");
-            TransportResponseError::StateTransitionFailed
+            Error::State
         })?;
         Ok(())
     }
@@ -95,52 +97,36 @@ impl UserAgentSession {
 
 #[messages]
 impl UserAgentSession {
-    // TODO: Think about refactoring it to state-machine based flow, as we already have one
-    #[message(ctx)]
-    pub async fn request_new_client_approval(
+    #[message]
+    pub async fn begin_new_client_approval(
         &mut self,
-        client_pubkey: VerifyingKey,
-        mut cancel_flag: watch::Receiver<()>,
-        ctx: &mut Context<Self, Result<bool, Error>>,
-    ) -> Result<bool, Error> {
-        self.send_msg(
-            Response::ClientConnectionRequest {
-                pubkey: client_pubkey,
-            },
-            ctx,
-        )
-        .await?;
+        client: ClientProfile,
+        controller: ActorRef<ClientApprovalController>,
+    ) {
+        if let Err(e) = self
+            .sender
+            .send(OutOfBand::ClientConnectionRequest {
+                profile: client.clone(),
+            })
+            .await
+        {
+            error!(
+                ?e,
+                actor = "user_agent",
+                event = "failed to announce new client connection"
+            );
+            return;
+        }
 
-        let extractor = |msg| {
-            if let Request::ClientConnectionResponse { approved } = msg {
-                Some(approved)
-            } else {
-                None
-            }
-        };
-
-        tokio::select! {
-            _ = cancel_flag.changed() => {
-                info!(actor = "useragent", "client connection approval cancelled");
-                self.send_msg(
-                    Response::ClientConnectionCancel,
-                    ctx,
-                ).await?;
-                Ok(false)
-            }
-            result = self.expect_msg(extractor, ctx) => {
-                let result = result?;
-                info!(actor = "useragent", "received client connection approval result: approved={}", result);
-                Ok(result)
-            }
-        }
+        self.pending_client_approvals
+            .insert(client.pubkey, PendingClientApproval { controller });
     }
 }
 
 impl Actor for UserAgentSession {
     type Args = Self;
 
-    type Error = TransportResponseError;
+    type Error = Error;
 
     async fn on_start(
         args: Self::Args,
@@ -148,63 +134,48 @@ impl Actor for UserAgentSession {
     ) -> Result<Self, Self::Error> {
         args.props
             .actors
-            .router
+            .flow_coordinator
             .ask(RegisterUserAgent {
                 actor: this.clone(),
             })
             .await
             .map_err(|err| {
-                error!(?err, "Failed to register user agent connection with router");
-                TransportResponseError::ConnectionRegistrationFailed
+                error!(
+                    ?err,
+                    "Failed to register user agent connection with flow coordinator"
+                );
+                Error::internal("Failed to register user agent connection with flow coordinator")
             })?;
         Ok(args)
     }
 
-    async fn next(
+    async fn on_link_died(
         &mut self,
-        _actor_ref: kameo::prelude::WeakActorRef<Self>,
-        mailbox_rx: &mut kameo::prelude::MailboxReceiver<Self>,
-    ) -> Option<kameo::mailbox::Signal<Self>> {
-        loop {
-            select! {
-                signal = mailbox_rx.recv() => {
-                    return signal;
-                }
-                msg = self.props.transport.recv() => {
-                    match msg {
-                        Some(request) => {
-                            match self.process_transport_inbound(request).await {
-                                Ok(response) => {
-                                    if self.props.transport.send(Ok(response)).await.is_err() {
-                                        error!(actor = "useragent", reason = "channel closed", "send.failed");
-                                        return Some(kameo::mailbox::Signal::Stop);
-                                    }
-                                }
-                                Err(err) => {
-                                    let _ = self.props.transport.send(Err(err)).await;
-                                    return Some(kameo::mailbox::Signal::Stop);
-                                }
-                            }
-                        }
-                        None => {
-                            info!(actor = "useragent", "transport.closed");
-                            return Some(kameo::mailbox::Signal::Stop);
-                        }
-                    }
-                }
-            }
-        }
+        _: kameo::prelude::WeakActorRef<Self>,
+        id: kameo::prelude::ActorId,
+        _: kameo::prelude::ActorStopReason,
+    ) -> Result<std::ops::ControlFlow<kameo::prelude::ActorStopReason>, Self::Error> {
+        let cancelled_pubkey = self
+            .pending_client_approvals
+            .iter()
+            .find_map(|(k, v)| (v.controller.id() == id).then_some(*k));
+
+        if let Some(pubkey) = cancelled_pubkey {
+            self.pending_client_approvals.remove(&pubkey);
+
+            if let Err(e) = self
+                .sender
+                .send(OutOfBand::ClientConnectionCancel { pubkey })
+                .await
+            {
+                error!(
+                    ?e,
+                    actor = "user_agent",
+                    event = "failed to announce client connection cancellation"
+                );
             }
         }
 
-impl UserAgentSession {
-    pub fn new_test(db: crate::db::DatabasePool, actors: crate::actors::GlobalActors) -> Self {
-        use arbiter_proto::transport::DummyTransport;
-        let transport: super::Transport = Box::new(DummyTransport::new());
-        let props = UserAgentConnection::new(db, actors, transport);
-        Self {
-            props,
-            state: UserAgentStateMachine::new(DummyContext),
-        }
+        Ok(std::ops::ControlFlow::Continue(()))
     }
 }

server/crates/arbiter-server/src/actors/user_agent/session/connection.rs

@@ -1,78 +1,43 @@
 use std::sync::Mutex;
 
+use alloy::{consensus::TxEip1559, primitives::Address, signers::Signature};
 use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
+use diesel::{ExpressionMethods as _, QueryDsl as _, SelectableHelper};
+use diesel_async::{AsyncConnection, RunQueryDsl};
 use kameo::error::SendError;
+use kameo::prelude::Context;
+use kameo::messages;
 use tracing::{error, info};
 use x25519_dalek::{EphemeralSecret, PublicKey};
 
+use crate::actors::flow_coordinator::client_connect_approval::ClientApprovalAnswer;
+use crate::actors::keyholder::KeyHolderState;
+use crate::actors::user_agent::session::Error;
+use crate::db::models::{
+    EvmWalletAccess, NewEvmWalletAccess, ProgramClient, ProgramClientMetadata,
+};
+use crate::evm::policies::{Grant, SpecificGrant};
 use crate::safe_cell::SafeCell;
 use crate::{
     actors::{
         evm::{
-            Generate, ListWallets, UseragentCreateGrant, UseragentDeleteGrant, UseragentListGrants,
+            ClientSignTransaction, Generate, ListWallets, SignTransactionError as EvmSignError,
+            UseragentCreateGrant, UseragentDeleteGrant, UseragentListGrants,
         },
         keyholder::{self, Bootstrap, TryUnseal},
-        user_agent::{
-            BootstrapError, Request, Response, TransportResponseError, UnsealError, VaultState,
-            session::{
+        user_agent::session::{
             UserAgentSession,
             state::{UnsealContext, UserAgentEvents, UserAgentStates},
         },
     },
-    },
     safe_cell::SafeCellHandle as _,
 };
 
 impl UserAgentSession {
-    pub async fn process_transport_inbound(&mut self, req: Request) -> Output {
-        match req {
-            Request::UnsealStart { client_pubkey } => {
-                self.handle_unseal_request(client_pubkey).await
-            }
-            Request::UnsealEncryptedKey {
-                nonce,
-                ciphertext,
-                associated_data,
-            } => {
-                self.handle_unseal_encrypted_key(nonce, ciphertext, associated_data)
-                    .await
-            }
-            Request::BootstrapEncryptedKey {
-                nonce,
-                ciphertext,
-                associated_data,
-            } => {
-                self.handle_bootstrap_encrypted_key(nonce, ciphertext, associated_data)
-                    .await
-            }
-            Request::ListGrants => self.handle_grant_list().await,
-            Request::QueryVaultState => self.handle_query_vault_state().await,
-            Request::EvmWalletCreate => self.handle_evm_wallet_create().await,
-            Request::EvmWalletList => self.handle_evm_wallet_list().await,
-            Request::AuthChallengeRequest { .. }
-            | Request::AuthChallengeSolution { .. }
-            | Request::ClientConnectionResponse { .. } => {
-                Err(TransportResponseError::UnexpectedRequestPayload)
-            }
-            Request::EvmGrantCreate {
-                client_id,
-                shared,
-                specific,
-            } => self.handle_grant_create(client_id, shared, specific).await,
-            Request::EvmGrantDelete { grant_id } => self.handle_grant_delete(grant_id).await,
-        }
-    }
-}
-
-type Output = Result<Response, TransportResponseError>;
-
-impl UserAgentSession {
-    fn take_unseal_secret(
-        &mut self,
-    ) -> Result<(EphemeralSecret, PublicKey), TransportResponseError> {
+    fn take_unseal_secret(&mut self) -> Result<(EphemeralSecret, PublicKey), Error> {
         let UserAgentStates::WaitingForUnsealKey(unseal_context) = self.state.state() else {
             error!("Received encrypted key in invalid state");
-            return Err(TransportResponseError::InvalidStateForUnsealEncryptedKey);
+            return Err(Error::internal("Invalid state for unseal encrypted key"));
         };
 
         let ephemeral_secret = {
@@ -87,7 +52,7 @@ impl UserAgentSession {
                 None => {
                     drop(secret_lock);
                     error!("Ephemeral secret already taken");
-                    return Err(TransportResponseError::StateTransitionFailed);
+                    return Err(Error::internal("Ephemeral secret already taken"));
                 }
             }
         };
@@ -121,8 +86,47 @@ impl UserAgentSession {
             }
         }
     }
+}
 
-    async fn handle_unseal_request(&mut self, client_pubkey: x25519_dalek::PublicKey) -> Output {
+pub struct UnsealStartResponse {
+    pub server_pubkey: PublicKey,
+}
+
+#[derive(Debug, Error)]
+pub enum UnsealError {
+    #[error("Invalid key provided for unsealing")]
+    InvalidKey,
+    #[error("Internal error during unsealing process")]
+    General(#[from] super::Error),
+}
+
+#[derive(Debug, Error)]
+pub enum BootstrapError {
+    #[error("Invalid key provided for bootstrapping")]
+    InvalidKey,
+    #[error("Vault is already bootstrapped")]
+    AlreadyBootstrapped,
+
+    #[error("Internal error during bootstrapping process")]
+    General(#[from] super::Error),
+}
+
+#[derive(Debug, Error)]
+pub enum SignTransactionError {
+    #[error("Policy evaluation failed")]
+    Vet(#[from] crate::evm::VetError),
+
+    #[error("Internal signing error")]
+    Internal,
+}
+
+#[messages]
+impl UserAgentSession {
+    #[message]
+    pub async fn handle_unseal_request(
+        &mut self,
+        client_pubkey: x25519_dalek::PublicKey,
+    ) -> Result<UnsealStartResponse, Error> {
         let secret = EphemeralSecret::random();
         let public_key = PublicKey::from(&secret);
 
@@ -131,24 +135,27 @@ impl UserAgentSession {
             client_public_key: client_pubkey,
         }))?;
 
-        Ok(Response::UnsealStartResponse {
+        Ok(UnsealStartResponse {
             server_pubkey: public_key,
         })
     }
 
-    async fn handle_unseal_encrypted_key(
+    #[message]
+    pub async fn handle_unseal_encrypted_key(
         &mut self,
         nonce: Vec<u8>,
         ciphertext: Vec<u8>,
         associated_data: Vec<u8>,
-    ) -> Output {
+    ) -> Result<(), UnsealError> {
         let (ephemeral_secret, client_public_key) = match self.take_unseal_secret() {
             Ok(values) => values,
-            Err(TransportResponseError::StateTransitionFailed) => {
+            Err(Error::State) => {
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                return Ok(Response::UnsealResult(Err(UnsealError::InvalidKey)));
+                return Err(UnsealError::InvalidKey);
+            }
+            Err(_err) => {
+                return Err(Error::internal("Failed to take unseal secret").into());
             }
-            Err(err) => return Err(err),
         };
 
         let seal_key_buffer = match Self::decrypt_client_key_material(
@@ -161,7 +168,7 @@ impl UserAgentSession {
             Ok(buffer) => buffer,
             Err(()) => {
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                return Ok(Response::UnsealResult(Err(UnsealError::InvalidKey)));
+                return Err(UnsealError::InvalidKey);
             }
         };
 
@@ -177,38 +184,39 @@ impl UserAgentSession {
             Ok(_) => {
                 info!("Successfully unsealed key with client-provided key");
                 self.transition(UserAgentEvents::ReceivedValidKey)?;
-                Ok(Response::UnsealResult(Ok(())))
+                Ok(())
             }
             Err(SendError::HandlerError(keyholder::Error::InvalidKey)) => {
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                Ok(Response::UnsealResult(Err(UnsealError::InvalidKey)))
+                Err(UnsealError::InvalidKey)
             }
             Err(SendError::HandlerError(err)) => {
                 error!(?err, "Keyholder failed to unseal key");
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                Ok(Response::UnsealResult(Err(UnsealError::InvalidKey)))
+                Err(UnsealError::InvalidKey)
             }
             Err(err) => {
                 error!(?err, "Failed to send unseal request to keyholder");
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                Err(TransportResponseError::KeyHolderActorUnreachable)
+                Err(Error::internal("Vault actor error").into())
             }
         }
     }
 
-    async fn handle_bootstrap_encrypted_key(
+    #[message]
+    pub(crate) async fn handle_bootstrap_encrypted_key(
         &mut self,
         nonce: Vec<u8>,
         ciphertext: Vec<u8>,
         associated_data: Vec<u8>,
-    ) -> Output {
+    ) -> Result<(), BootstrapError> {
         let (ephemeral_secret, client_public_key) = match self.take_unseal_secret() {
             Ok(values) => values,
-            Err(TransportResponseError::StateTransitionFailed) => {
+            Err(Error::State) => {
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                return Ok(Response::BootstrapResult(Err(BootstrapError::InvalidKey)));
+                return Err(BootstrapError::InvalidKey);
             }
-            Err(err) => return Err(err),
+            Err(err) => return Err(err.into()),
         };
 
         let seal_key_buffer = match Self::decrypt_client_key_material(
@@ -221,7 +229,7 @@ impl UserAgentSession {
             Ok(buffer) => buffer,
             Err(()) => {
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                return Ok(Response::BootstrapResult(Err(BootstrapError::InvalidKey)));
+                return Err(BootstrapError::InvalidKey);
             }
         };
 
@@ -237,107 +245,110 @@ impl UserAgentSession {
             Ok(_) => {
                 info!("Successfully bootstrapped vault with client-provided key");
                 self.transition(UserAgentEvents::ReceivedValidKey)?;
-                Ok(Response::BootstrapResult(Ok(())))
+                Ok(())
             }
             Err(SendError::HandlerError(keyholder::Error::AlreadyBootstrapped)) => {
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                Ok(Response::BootstrapResult(Err(
-                    BootstrapError::AlreadyBootstrapped,
-                )))
+                Err(BootstrapError::AlreadyBootstrapped)
             }
             Err(SendError::HandlerError(err)) => {
                 error!(?err, "Keyholder failed to bootstrap vault");
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                Ok(Response::BootstrapResult(Err(BootstrapError::InvalidKey)))
+                Err(BootstrapError::InvalidKey)
             }
             Err(err) => {
                 error!(?err, "Failed to send bootstrap request to keyholder");
                 self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                Err(TransportResponseError::KeyHolderActorUnreachable)
+                Err(BootstrapError::General(Error::internal(
+                    "Vault actor error",
+                )))
             }
         }
     }
 }
 
+#[messages]
 impl UserAgentSession {
-    async fn handle_query_vault_state(&mut self) -> Output {
-        use crate::actors::keyholder::{GetState, StateDiscriminants};
+    #[message]
+    pub(crate) async fn handle_query_vault_state(&mut self) -> Result<KeyHolderState, Error> {
+        use crate::actors::keyholder::GetState;
 
         let vault_state = match self.props.actors.key_holder.ask(GetState {}).await {
-            Ok(StateDiscriminants::Unbootstrapped) => VaultState::Unbootstrapped,
-            Ok(StateDiscriminants::Sealed) => VaultState::Sealed,
-            Ok(StateDiscriminants::Unsealed) => VaultState::Unsealed,
+            Ok(state) => state,
             Err(err) => {
                 error!(?err, actor = "useragent", "keyholder.query.failed");
-                return Err(TransportResponseError::KeyHolderActorUnreachable);
+                return Err(Error::internal("Vault is in broken state"));
             }
         };
 
-        Ok(Response::VaultState(vault_state))
+        Ok(vault_state)
     }
 }
 
+#[messages]
 impl UserAgentSession {
-    async fn handle_evm_wallet_create(&mut self) -> Output {
-        let result = match self.props.actors.evm.ask(Generate {}).await {
-            Ok(_address) => return Ok(Response::EvmWalletCreate(Ok(()))),
-            Err(SendError::HandlerError(err)) => Err(err),
+    #[message]
+    pub(crate) async fn handle_evm_wallet_create(&mut self) -> Result<(i32, Address), Error> {
+        match self.props.actors.evm.ask(Generate {}).await {
+            Ok(address) => Ok(address),
+            Err(SendError::HandlerError(err)) => Err(Error::internal(format!(
+                "EVM wallet generation failed: {err}"
+            ))),
             Err(err) => {
                 error!(?err, "EVM actor unreachable during wallet create");
-                return Err(TransportResponseError::KeyHolderActorUnreachable);
+                Err(Error::internal("EVM actor unreachable"))
+            }
         }
-        };
-        Ok(Response::EvmWalletCreate(result))
     }
 
-    async fn handle_evm_wallet_list(&mut self) -> Output {
+    #[message]
+    pub(crate) async fn handle_evm_wallet_list(&mut self) -> Result<Vec<(i32, Address)>, Error> {
         match self.props.actors.evm.ask(ListWallets {}).await {
-            Ok(wallets) => Ok(Response::EvmWalletList(wallets)),
+            Ok(wallets) => Ok(wallets),
             Err(err) => {
                 error!(?err, "EVM wallet list failed");
-                Err(TransportResponseError::KeyHolderActorUnreachable)
+                Err(Error::internal("Failed to list EVM wallets"))
             }
         }
     }
 }
 
+#[messages]
 impl UserAgentSession {
-    async fn handle_grant_list(&mut self) -> Output {
+    #[message]
+    pub(crate) async fn handle_grant_list(&mut self) -> Result<Vec<Grant<SpecificGrant>>, Error> {
         match self.props.actors.evm.ask(UseragentListGrants {}).await {
-            Ok(grants) => Ok(Response::ListGrants(grants)),
+            Ok(grants) => Ok(grants),
             Err(err) => {
                 error!(?err, "EVM grant list failed");
-                Err(TransportResponseError::KeyHolderActorUnreachable)
+                Err(Error::internal("Failed to list EVM grants"))
             }
         }
     }
 
-    async fn handle_grant_create(
+    #[message]
+    pub(crate) async fn handle_grant_create(
         &mut self,
-        client_id: i32,
         basic: crate::evm::policies::SharedGrantSettings,
         grant: crate::evm::policies::SpecificGrant,
-    ) -> Output {
+    ) -> Result<i32, Error> {
         match self
             .props
             .actors
             .evm
-            .ask(UseragentCreateGrant {
-                client_id,
-                basic,
-                grant,
-            })
+            .ask(UseragentCreateGrant { basic, grant })
             .await
         {
-            Ok(grant_id) => Ok(Response::EvmGrantCreate(Ok(grant_id))),
+            Ok(grant_id) => Ok(grant_id),
             Err(err) => {
                 error!(?err, "EVM grant create failed");
-                Err(TransportResponseError::KeyHolderActorUnreachable)
+                Err(Error::internal("Failed to create EVM grant"))
             }
         }
     }
 
-    async fn handle_grant_delete(&mut self, grant_id: i32) -> Output {
+    #[message]
+    pub(crate) async fn handle_grant_delete(&mut self, grant_id: i32) -> Result<(), Error> {
         match self
             .props
             .actors
@@ -345,11 +356,155 @@ impl UserAgentSession {
             .ask(UseragentDeleteGrant { grant_id })
             .await
         {
-            Ok(()) => Ok(Response::EvmGrantDelete(Ok(()))),
+            Ok(()) => Ok(()),
             Err(err) => {
                 error!(?err, "EVM grant delete failed");
-                Err(TransportResponseError::KeyHolderActorUnreachable)
+                Err(Error::internal("Failed to delete EVM grant"))
             }
         }
     }
+
+    #[message]
+    pub(crate) async fn handle_sign_transaction(
+        &mut self,
+        client_id: i32,
+        wallet_address: Address,
+        transaction: TxEip1559,
+    ) -> Result<Signature, SignTransactionError> {
+        match self
+            .props
+            .actors
+            .evm
+            .ask(ClientSignTransaction {
+                client_id,
+                wallet_address,
+                transaction,
+            })
+            .await
+        {
+            Ok(signature) => Ok(signature),
+            Err(SendError::HandlerError(EvmSignError::Vet(vet_error))) => {
+                Err(SignTransactionError::Vet(vet_error))
+            }
+            Err(err) => {
+                error!(?err, "EVM sign transaction failed in user-agent session");
+                Err(SignTransactionError::Internal)
+            }
+        }
+    }
+
+    #[message]
+    pub(crate) async fn handle_grant_evm_wallet_access(
+        &mut self,
+        entries: Vec<NewEvmWalletAccess>,
+    ) -> Result<(), Error> {
+        let mut conn = self.props.db.get().await?;
+        conn.transaction(|conn| {
+            Box::pin(async move {
+                use crate::db::schema::evm_wallet_access;
+
+                for entry in entries {
+                    diesel::insert_into(evm_wallet_access::table)
+                        .values(&entry)
+                        .on_conflict_do_nothing()
+                        .execute(conn)
+                        .await?;
+                }
+
+                Result::<_, Error>::Ok(())
+            })
+        })
+        .await?;
+        Ok(())
+    }
+
+    #[message]
+    pub(crate) async fn handle_revoke_evm_wallet_access(
+        &mut self,
+        entries: Vec<i32>,
+    ) -> Result<(), Error> {
+        let mut conn = self.props.db.get().await?;
+        conn.transaction(|conn| {
+            Box::pin(async move {
+                use crate::db::schema::evm_wallet_access;
+                for entry in entries {
+                    diesel::delete(evm_wallet_access::table)
+                        .filter(evm_wallet_access::wallet_id.eq(entry))
+                        .execute(conn)
+                        .await?;
+                }
+
+                Result::<_, Error>::Ok(())
+            })
+        })
+        .await?;
+        Ok(())
+    }
+
+    #[message]
+    pub(crate) async fn handle_list_wallet_access(
+        &mut self,
+    ) -> Result<Vec<EvmWalletAccess>, Error> {
+        let mut conn = self.props.db.get().await?;
+        use crate::db::schema::evm_wallet_access;
+        let access_entries = evm_wallet_access::table
+            .select(EvmWalletAccess::as_select())
+            .load::<_>(&mut conn)
+            .await?;
+        Ok(access_entries)
+    }
+}
+
+#[messages]
+impl UserAgentSession {
+    #[message(ctx)]
+    pub(crate) async fn handle_new_client_approve(
+        &mut self,
+        approved: bool,
+        pubkey: ed25519_dalek::VerifyingKey,
+        ctx: &mut Context<Self, Result<(), Error>>,
+    ) -> Result<(), Error> {
+        let pending_approval = match self.pending_client_approvals.remove(&pubkey) {
+            Some(approval) => approval,
+            None => {
+                error!("Received client connection response for unknown client");
+                return Err(Error::internal("Unknown client in connection response"));
+            }
+        };
+
+        pending_approval
+            .controller
+            .tell(ClientApprovalAnswer { approved })
+            .await
+            .map_err(|err| {
+                error!(
+                    ?err,
+                    "Failed to send client approval response to controller"
+                );
+                Error::internal("Failed to send client approval response to controller")
+            })?;
+
+        ctx.actor_ref().unlink(&pending_approval.controller).await;
+
+        Ok(())
+    }
+
+    #[message]
+    pub(crate) async fn handle_sdk_client_list(
+        &mut self,
+    ) -> Result<Vec<(ProgramClient, ProgramClientMetadata)>, Error> {
+        use crate::db::schema::{client_metadata, program_client};
+        let mut conn = self.props.db.get().await?;
+
+        let clients = program_client::table
+            .inner_join(client_metadata::table)
+            .select((
+                ProgramClient::as_select(),
+                ProgramClientMetadata::as_select(),
+            ))
+            .load::<(ProgramClient, ProgramClientMetadata)>(&mut conn)
+            .await?;
+
+        Ok(clients)
+    }
 }

server/crates/arbiter-server/src/context/tls.rs

@@ -1,4 +1,4 @@
-use std::string::FromUtf8Error;
+use std::{net::IpAddr, string::FromUtf8Error};
 
 use diesel::{ExpressionMethods as _, QueryDsl, SelectableHelper as _};
 use diesel_async::{AsyncConnection, RunQueryDsl};
@@ -6,7 +6,7 @@ use miette::Diagnostic;
 use pem::Pem;
 use rcgen::{
     BasicConstraints, Certificate, CertificateParams, CertifiedIssuer, DistinguishedName, DnType,
-    IsCa, Issuer, KeyPair, KeyUsagePurpose,
+    IsCa, Issuer, KeyPair, KeyUsagePurpose, SanType,
 };
 use rustls::pki_types::pem::PemObject;
 use thiserror::Error;
@@ -114,6 +114,11 @@ impl TlsCa {
             KeyUsagePurpose::DigitalSignature,
             KeyUsagePurpose::KeyEncipherment,
         ];
+        params
+            .subject_alt_names
+            .push(SanType::IpAddress(IpAddr::from([
+                127, 0, 0, 1,
+            ])));
 
         let mut dn = DistinguishedName::new();
         dn.push(DnType::CommonName, "Arbiter Instance Leaf");

server/crates/arbiter-server/src/db/mod.rs

@@ -44,6 +44,14 @@ pub enum DatabaseSetupError {
     Pool(#[from] PoolInitError),
 }
 
+#[derive(Error, Debug)]
+pub enum DatabaseError {
+    #[error("Database connection error")]
+    Pool(#[from] PoolError),
+    #[error("Database query error")]
+    Connection(#[from] diesel::result::Error),
+}
+
 #[tracing::instrument(level = "info")]
 fn database_path() -> Result<std::path::PathBuf, DatabaseSetupError> {
     let arbiter_home = arbiter_proto::home_path().map_err(DatabaseSetupError::HomeDir)?;

server/crates/arbiter-server/src/db/models.rs

@@ -21,7 +21,7 @@ pub mod types {
         sqlite::{Sqlite, SqliteType},
     };
 
-    #[derive(Debug, FromSqlRow, AsExpression)]
+    #[derive(Debug, FromSqlRow, AsExpression, Clone)]
     #[diesel(sql_type = Integer)]
     #[repr(transparent)] // hint compiler to optimize the wrapper struct away
     pub struct SqliteTimestamp(pub DateTime<Utc>);
@@ -185,12 +185,53 @@ pub struct EvmWallet {
     pub created_at: SqliteTimestamp,
 }
 
-#[derive(Queryable, Debug, Insertable, Selectable)]
+#[derive(Models, Queryable, Debug, Insertable, Selectable, Clone)]
+#[diesel(table_name = schema::evm_wallet_access, check_for_backend(Sqlite))]
+#[view(
+    NewEvmWalletAccess,
+    derive(Insertable),
+    omit(id, created_at),
+    attributes_with = "deriveless"
+)]
+#[view(
+    CoreEvmWalletAccess,
+    derive(Insertable),
+    omit(created_at),
+    attributes_with = "deriveless"
+)]
+pub struct EvmWalletAccess {
+    pub id: i32,
+    pub wallet_id: i32,
+    pub client_id: i32,
+    pub created_at: SqliteTimestamp,
+}
+
+#[derive(Models, Queryable, Debug, Insertable, Selectable)]
+#[diesel(table_name = schema::client_metadata, check_for_backend(Sqlite))]
+pub struct ProgramClientMetadata {
+    pub id: i32,
+    pub name: String,
+    pub description: Option<String>,
+    pub version: Option<String>,
+    pub created_at: SqliteTimestamp,
+}
+
+#[derive(Models, Queryable, Debug, Insertable, Selectable)]
+#[diesel(table_name = schema::client_metadata_history, check_for_backend(Sqlite))]
+pub struct ProgramClientMetadataHistory {
+    pub id: i32,
+    pub metadata_id: i32,
+    pub client_id: i32,
+    pub created_at: SqliteTimestamp,
+}
+
+#[derive(Models, Queryable, Debug, Insertable, Selectable)]
 #[diesel(table_name = schema::program_client, check_for_backend(Sqlite))]
 pub struct ProgramClient {
     pub id: i32,
     pub nonce: i32,
     pub public_key: Vec<u8>,
+    pub metadata_id: i32,
     pub created_at: SqliteTimestamp,
     pub updated_at: SqliteTimestamp,
 }
@@ -230,8 +271,7 @@ pub struct EvmEtherTransferLimit {
 )]
 pub struct EvmBasicGrant {
     pub id: i32,
-    pub wallet_id: i32, // references evm_wallet.id
-    pub client_id: i32, // references program_client.id
+    pub wallet_access_id: i32, // references evm_wallet_access.id
     pub chain_id: i32,
     pub valid_from: Option<SqliteTimestamp>,
     pub valid_until: Option<SqliteTimestamp>,
@@ -254,8 +294,7 @@ pub struct EvmBasicGrant {
 pub struct EvmTransactionLog {
     pub id: i32,
     pub grant_id: i32,
-    pub client_id: i32,
-    pub wallet_id: i32,
+    pub wallet_access_id: i32,
     pub chain_id: i32,
     pub eth_value: Vec<u8>,
     pub signed_at: SqliteTimestamp,

server/crates/arbiter-server/src/db/schema.rs

@@ -20,11 +20,29 @@ diesel::table! {
     }
 }
 
+diesel::table! {
+    client_metadata (id) {
+        id -> Integer,
+        name -> Text,
+        description -> Nullable<Text>,
+        version -> Nullable<Text>,
+        created_at -> Integer,
+    }
+}
+
+diesel::table! {
+    client_metadata_history (id) {
+        id -> Integer,
+        metadata_id -> Integer,
+        client_id -> Integer,
+        created_at -> Integer,
+    }
+}
+
 diesel::table! {
     evm_basic_grant (id) {
         id -> Integer,
-        wallet_id -> Integer,
-        client_id -> Integer,
+        wallet_access_id -> Integer,
         chain_id -> Integer,
         valid_from -> Nullable<Integer>,
         valid_until -> Nullable<Integer>,
@@ -95,9 +113,8 @@ diesel::table! {
 diesel::table! {
     evm_transaction_log (id) {
         id -> Integer,
+        wallet_access_id -> Integer,
         grant_id -> Integer,
-        client_id -> Integer,
-        wallet_id -> Integer,
         chain_id -> Integer,
         eth_value -> Binary,
         signed_at -> Integer,
@@ -113,11 +130,21 @@ diesel::table! {
     }
 }
 
+diesel::table! {
+    evm_wallet_access (id) {
+        id -> Integer,
+        wallet_id -> Integer,
+        client_id -> Integer,
+        created_at -> Integer,
+    }
+}
+
 diesel::table! {
     program_client (id) {
         id -> Integer,
         nonce -> Integer,
         public_key -> Binary,
+        metadata_id -> Integer,
         created_at -> Integer,
         updated_at -> Integer,
     }
@@ -151,17 +178,18 @@ diesel::table! {
         id -> Integer,
         nonce -> Integer,
         public_key -> Binary,
+        key_type -> Integer,
         created_at -> Integer,
         updated_at -> Integer,
-        key_type -> Integer,
     }
 }
 
 diesel::joinable!(aead_encrypted -> root_key_history (associated_root_key_id));
 diesel::joinable!(arbiter_settings -> root_key_history (root_key_id));
 diesel::joinable!(arbiter_settings -> tls_history (tls_id));
-diesel::joinable!(evm_basic_grant -> evm_wallet (wallet_id));
-diesel::joinable!(evm_basic_grant -> program_client (client_id));
+diesel::joinable!(client_metadata_history -> client_metadata (metadata_id));
+diesel::joinable!(client_metadata_history -> program_client (client_id));
+diesel::joinable!(evm_basic_grant -> evm_wallet_access (wallet_access_id));
 diesel::joinable!(evm_ether_transfer_grant -> evm_basic_grant (basic_grant_id));
 diesel::joinable!(evm_ether_transfer_grant -> evm_ether_transfer_limit (limit_id));
 diesel::joinable!(evm_ether_transfer_grant_target -> evm_ether_transfer_grant (grant_id));
@@ -169,11 +197,18 @@ diesel::joinable!(evm_token_transfer_grant -> evm_basic_grant (basic_grant_id));
 diesel::joinable!(evm_token_transfer_log -> evm_token_transfer_grant (grant_id));
 diesel::joinable!(evm_token_transfer_log -> evm_transaction_log (log_id));
 diesel::joinable!(evm_token_transfer_volume_limit -> evm_token_transfer_grant (grant_id));
+diesel::joinable!(evm_transaction_log -> evm_basic_grant (grant_id));
+diesel::joinable!(evm_transaction_log -> evm_wallet_access (wallet_access_id));
 diesel::joinable!(evm_wallet -> aead_encrypted (aead_encrypted_id));
+diesel::joinable!(evm_wallet_access -> evm_wallet (wallet_id));
+diesel::joinable!(evm_wallet_access -> program_client (client_id));
+diesel::joinable!(program_client -> client_metadata (metadata_id));
 
 diesel::allow_tables_to_appear_in_same_query!(
     aead_encrypted,
     arbiter_settings,
+    client_metadata,
+    client_metadata_history,
     evm_basic_grant,
     evm_ether_transfer_grant,
     evm_ether_transfer_grant_target,
@@ -183,6 +218,7 @@ diesel::allow_tables_to_appear_in_same_query!(
     evm_token_transfer_volume_limit,
     evm_transaction_log,
     evm_wallet,
+    evm_wallet_access,
     program_client,
     root_key_history,
     tls_history,

server/crates/arbiter-server/src/evm/mod.rs

@@ -6,13 +6,15 @@ use alloy::{
     primitives::{TxKind, U256},
 };
 use chrono::Utc;
-use diesel::{ExpressionMethods as _, QueryDsl, QueryResult, insert_into, sqlite::Sqlite};
+use diesel::{ExpressionMethods as _, QueryDsl as _, QueryResult, insert_into, sqlite::Sqlite};
 use diesel_async::{AsyncConnection, RunQueryDsl};
 
 use crate::{
     db::{
-        self,
-        models::{EvmBasicGrant, NewEvmBasicGrant, NewEvmTransactionLog, SqliteTimestamp},
+        self, DatabaseError,
+        models::{
+            EvmBasicGrant, EvmWalletAccess, NewEvmBasicGrant, NewEvmTransactionLog, SqliteTimestamp,
+        },
         schema::{self, evm_transaction_log},
     },
     evm::policies::{
@@ -28,12 +30,8 @@ mod utils;
 /// Errors that can only occur once the transaction meaning is known (during policy evaluation)
 #[derive(Debug, thiserror::Error, miette::Diagnostic)]
 pub enum PolicyError {
-    #[error("Database connection pool error")]
-    #[diagnostic(code(arbiter_server::evm::policy_error::pool))]
-    Pool(#[from] db::PoolError),
-    #[error("Database returned error")]
-    #[diagnostic(code(arbiter_server::evm::policy_error::database))]
-    Database(#[from] diesel::result::Error),
+    #[error("Database error")]
+    Database(#[from] crate::db::DatabaseError),
     #[error("Transaction violates policy: {0:?}")]
     #[diagnostic(code(arbiter_server::evm::policy_error::violation))]
     Violations(Vec<EvalViolation>),
@@ -55,16 +53,6 @@ pub enum VetError {
     Evaluated(SpecificMeaning, #[source] PolicyError),
 }
 
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
-pub enum SignError {
-    #[error("Database connection pool error")]
-    #[diagnostic(code(arbiter_server::evm::database_error))]
-    Pool(#[from] db::PoolError),
-    #[error("Database returned error")]
-    #[diagnostic(code(arbiter_server::evm::database_error))]
-    Database(#[from] diesel::result::Error),
-}
-
 #[derive(Debug, thiserror::Error, miette::Diagnostic)]
 pub enum AnalyzeError {
     #[error("Engine doesn't support granting permissions for contract creation")]
@@ -76,28 +64,6 @@ pub enum AnalyzeError {
     UnsupportedTransactionType,
 }
 
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
-pub enum CreationError {
-    #[error("Database connection pool error")]
-    #[diagnostic(code(arbiter_server::evm::creation_error::database_error))]
-    Pool(#[from] db::PoolError),
-
-    #[error("Database returned error")]
-    #[diagnostic(code(arbiter_server::evm::creation_error::database_error))]
-    Database(#[from] diesel::result::Error),
-}
-
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
-pub enum ListGrantsError {
-    #[error("Database connection pool error")]
-    #[diagnostic(code(arbiter_server::evm::list_grants_error::pool))]
-    Pool(#[from] db::PoolError),
-
-    #[error("Database returned error")]
-    #[diagnostic(code(arbiter_server::evm::list_grants_error::database))]
-    Database(#[from] diesel::result::Error),
-}
-
 /// Controls whether a transaction should be executed or only validated
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum RunKind {
@@ -165,16 +131,22 @@ impl Engine {
         meaning: &P::Meaning,
         run_kind: RunKind,
     ) -> Result<(), PolicyError> {
-        let mut conn = self.db.get().await?;
+        let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
 
         let grant = P::try_find_grant(&context, &mut conn)
-            .await?
+            .await
+            .map_err(DatabaseError::from)?
             .ok_or(PolicyError::NoMatchingGrant)?;
 
         let mut violations =
             check_shared_constraints(&context, &grant.shared, grant.shared_grant_id, &mut conn)
-                .await?;
-        violations.extend(P::evaluate(&context, meaning, &grant, &mut conn).await?);
+                .await
+                .map_err(DatabaseError::from)?;
+        violations.extend(
+            P::evaluate(&context, meaning, &grant, &mut conn)
+                .await
+                .map_err(DatabaseError::from)?,
+        );
 
         if !violations.is_empty() {
             return Err(PolicyError::Violations(violations));
@@ -184,8 +156,7 @@ impl Engine {
                     let log_id: i32 = insert_into(evm_transaction_log::table)
                         .values(&NewEvmTransactionLog {
                             grant_id: grant.shared_grant_id,
-                            client_id: context.client_id,
-                            wallet_id: context.wallet_id,
+                            wallet_access_id: context.target.id,
                             chain_id: context.chain as i32,
                             eth_value: utils::u256_to_bytes(context.value).to_vec(),
                             signed_at: Utc::now().into(),
@@ -199,7 +170,8 @@ impl Engine {
                     QueryResult::Ok(())
                 })
             })
-            .await?;
+            .await
+            .map_err(DatabaseError::from)?;
         }
 
         Ok(())
@@ -213,9 +185,8 @@ impl Engine {
 
     pub async fn create_grant<P: Policy>(
         &self,
-        client_id: i32,
         full_grant: FullGrant<P::Settings>,
-    ) -> Result<i32, CreationError> {
+    ) -> Result<i32, DatabaseError> {
         let mut conn = self.db.get().await?;
 
         let id = conn
@@ -225,9 +196,8 @@ impl Engine {
 
                     let basic_grant: EvmBasicGrant = insert_into(evm_basic_grant::table)
                         .values(&NewEvmBasicGrant {
-                            wallet_id: full_grant.basic.wallet_id,
                             chain_id: full_grant.basic.chain as i32,
-                            client_id,
+                            wallet_access_id: full_grant.basic.wallet_access_id,
                             valid_from: full_grant.basic.valid_from.map(SqliteTimestamp),
                             valid_until: full_grant.basic.valid_until.map(SqliteTimestamp),
                             max_gas_fee_per_gas: full_grant
@@ -262,7 +232,7 @@ impl Engine {
         Ok(id)
     }
 
-    pub async fn list_all_grants(&self) -> Result<Vec<Grant<SpecificGrant>>, ListGrantsError> {
+    pub async fn list_all_grants(&self) -> Result<Vec<Grant<SpecificGrant>>, DatabaseError> {
         let mut conn = self.db.get().await?;
 
         let mut grants: Vec<Grant<SpecificGrant>> = Vec::new();
@@ -295,8 +265,7 @@ impl Engine {
 
     pub async fn evaluate_transaction(
         &self,
-        wallet_id: i32,
-        client_id: i32,
+        target: EvmWalletAccess,
         transaction: TxEip1559,
         run_kind: RunKind,
     ) -> Result<SpecificMeaning, VetError> {
@@ -304,8 +273,7 @@ impl Engine {
             return Err(VetError::ContractCreationNotSupported);
         };
         let context = policies::EvalContext {
-            wallet_id,
-            client_id,
+            target,
             chain: transaction.chain_id,
             to,
             value: transaction.value,

server/crates/arbiter-server/src/evm/policies.rs

@@ -10,7 +10,7 @@ use miette::Diagnostic;
 use thiserror::Error;
 
 use crate::{
-    db::models::{self, EvmBasicGrant},
+    db::models::{self, EvmBasicGrant, EvmWalletAccess},
     evm::utils,
 };
 
@@ -19,9 +19,8 @@ pub mod token_transfers;
 
 #[derive(Debug, Clone)]
 pub struct EvalContext {
-    // Which wallet is this transaction for
-    pub client_id: i32,
-    pub wallet_id: i32,
+    // Which wallet is this transaction for and who requested it
+    pub target: EvmWalletAccess,
 
     // The transaction data
     pub chain: ChainId,
@@ -145,8 +144,7 @@ pub struct VolumeRateLimit {
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct SharedGrantSettings {
-    pub wallet_id: i32,
-    pub client_id: i32,
+    pub wallet_access_id: i32,
     pub chain: ChainId,
 
     pub valid_from: Option<DateTime<Utc>>,
@@ -161,8 +159,7 @@ pub struct SharedGrantSettings {
 impl SharedGrantSettings {
     fn try_from_model(model: EvmBasicGrant) -> QueryResult<Self> {
         Ok(Self {
-            wallet_id: model.wallet_id,
-            client_id: model.client_id,
+            wallet_access_id: model.wallet_access_id,
             chain: model.chain_id as u64, // safe because chain_id is stored as i32 but is guaranteed to be a valid ChainId by the API when creating grants
             valid_from: model.valid_from.map(Into::into),
             valid_until: model.valid_until.map(Into::into),

server/crates/arbiter-server/src/evm/policies/ether_transfer/mod.rs

@@ -36,8 +36,8 @@ use super::{DatabaseID, EvalContext, EvalViolation};
 // Plain ether transfer
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct Meaning {
-    to: Address,
-    value: U256,
+    pub(crate) to: Address,
+    pub(crate) value: U256,
 }
 impl Display for Meaning {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
@@ -91,6 +91,7 @@ async fn query_relevant_past_transaction(
 
 async fn check_rate_limits(
     grant: &Grant<Settings>,
+    current_transfer_value: U256,
     db: &mut impl AsyncConnection<Backend = Sqlite>,
 ) -> QueryResult<Vec<EvalViolation>> {
     let mut violations = Vec::new();
@@ -99,12 +100,12 @@ async fn check_rate_limits(
     let past_transaction = query_relevant_past_transaction(grant.id, window, db).await?;
 
     let window_start = chrono::Utc::now() - grant.settings.limit.window;
-    let cumulative_volume: U256 = past_transaction
+    let prospective_cumulative_volume: U256 = past_transaction
         .iter()
         .filter(|(_, timestamp)| timestamp >= &window_start)
-        .fold(U256::default(), |acc, (value, _)| acc + *value);
+        .fold(current_transfer_value, |acc, (value, _)| acc + *value);
 
-    if cumulative_volume > grant.settings.limit.max_volume {
+    if prospective_cumulative_volume > grant.settings.limit.max_volume {
         violations.push(EvalViolation::VolumetricLimitExceeded);
     }
 
@@ -141,7 +142,7 @@ impl Policy for EtherTransfer {
             violations.push(EvalViolation::InvalidTarget { target: meaning.to });
         }
 
-        let rate_violations = check_rate_limits(grant, db).await?;
+        let rate_violations = check_rate_limits(grant, meaning.value, db).await?;
         violations.extend(rate_violations);
 
         Ok(violations)
@@ -196,9 +197,8 @@ impl Policy for EtherTransfer {
             .inner_join(evm_basic_grant::table)
             .inner_join(evm_ether_transfer_grant_target::table)
             .filter(
-                evm_basic_grant::wallet_id
-                    .eq(context.wallet_id)
-                    .and(evm_basic_grant::client_id.eq(context.client_id))
+                evm_basic_grant::wallet_access_id
+                    .eq(context.target.id)
                     .and(evm_basic_grant::revoked_at.is_null())
                     .and(evm_ether_transfer_grant_target::address.eq(&target_bytes)),
             )

server/crates/arbiter-server/src/evm/policies/ether_transfer/tests.rs

@@ -5,7 +5,9 @@ use diesel_async::RunQueryDsl;
 
 use crate::db::{
     self, DatabaseConnection,
-    models::{EvmBasicGrant, NewEvmBasicGrant, NewEvmTransactionLog, SqliteTimestamp},
+    models::{
+        EvmBasicGrant, EvmWalletAccess, NewEvmBasicGrant, NewEvmTransactionLog, SqliteTimestamp,
+    },
     schema::{evm_basic_grant, evm_transaction_log},
 };
 use crate::evm::{
@@ -15,8 +17,7 @@ use crate::evm::{
 
 use super::{EtherTransfer, Settings};
 
-const WALLET_ID: i32 = 1;
-const CLIENT_ID: i32 = 2;
+const WALLET_ACCESS_ID: i32 = 1;
 const CHAIN_ID: u64 = 1;
 
 const ALLOWED: Address = address!("1111111111111111111111111111111111111111");
@@ -24,8 +25,12 @@ const OTHER: Address = address!("2222222222222222222222222222222222222222");
 
 fn ctx(to: Address, value: U256) -> EvalContext {
     EvalContext {
-        wallet_id: WALLET_ID,
-        client_id: CLIENT_ID,
+        target: EvmWalletAccess {
+            id: WALLET_ACCESS_ID,
+            wallet_id: 10,
+            client_id: 20,
+            created_at: SqliteTimestamp(Utc::now()),
+        },
         chain: CHAIN_ID,
         to,
         value,
@@ -38,8 +43,7 @@ fn ctx(to: Address, value: U256) -> EvalContext {
 async fn insert_basic(conn: &mut DatabaseConnection, revoked: bool) -> EvmBasicGrant {
     insert_into(evm_basic_grant::table)
         .values(NewEvmBasicGrant {
-            wallet_id: WALLET_ID,
-            client_id: CLIENT_ID,
+            wallet_access_id: WALLET_ACCESS_ID,
             chain_id: CHAIN_ID as i32,
             valid_from: None,
             valid_until: None,
@@ -67,14 +71,13 @@ fn make_settings(targets: Vec<Address>, max_volume: u64) -> Settings {
 
 fn shared() -> SharedGrantSettings {
     SharedGrantSettings {
-        wallet_id: WALLET_ID,
+        wallet_access_id: WALLET_ACCESS_ID,
         chain: CHAIN_ID,
         valid_from: None,
         valid_until: None,
         max_gas_fee_per_gas: None,
         max_priority_fee_per_gas: None,
         rate_limit: None,
-        client_id: CLIENT_ID,
     }
 }
 
@@ -153,8 +156,7 @@ async fn evaluate_passes_when_volume_within_limit() {
     insert_into(evm_transaction_log::table)
         .values(NewEvmTransactionLog {
             grant_id,
-            client_id: CLIENT_ID,
-            wallet_id: WALLET_ID,
+            wallet_access_id: WALLET_ACCESS_ID,
             chain_id: CHAIN_ID as i32,
             eth_value: utils::u256_to_bytes(U256::from(500u64)).to_vec(),
             signed_at: SqliteTimestamp(Utc::now()),
@@ -194,10 +196,9 @@ async fn evaluate_rejects_volume_over_limit() {
     insert_into(evm_transaction_log::table)
         .values(NewEvmTransactionLog {
             grant_id,
-            client_id: CLIENT_ID,
-            wallet_id: WALLET_ID,
+            wallet_access_id: WALLET_ACCESS_ID,
             chain_id: CHAIN_ID as i32,
-            eth_value: utils::u256_to_bytes(U256::from(1_001u64)).to_vec(),
+            eth_value: utils::u256_to_bytes(U256::from(1_000u64)).to_vec(),
             signed_at: SqliteTimestamp(Utc::now()),
         })
         .execute(&mut *conn)
@@ -210,7 +211,7 @@ async fn evaluate_rejects_volume_over_limit() {
         shared: shared(),
         settings,
     };
-    let context = ctx(ALLOWED, U256::from(100u64));
+    let context = ctx(ALLOWED, U256::from(1u64));
     let m = EtherTransfer::analyze(&context).unwrap();
     let v = EtherTransfer::evaluate(&context, &m, &grant, &mut *conn)
         .await
@@ -232,14 +233,13 @@ async fn evaluate_passes_at_exactly_volume_limit() {
         .await
         .unwrap();
 
-    // Exactly at the limit — the check is `>`, so this should not violate
+    // Exactly at the limit including current transfer — check is `>`, so this should not violate
     insert_into(evm_transaction_log::table)
         .values(NewEvmTransactionLog {
             grant_id,
-            client_id: CLIENT_ID,
-            wallet_id: WALLET_ID,
+            wallet_access_id: WALLET_ACCESS_ID,
             chain_id: CHAIN_ID as i32,
-            eth_value: utils::u256_to_bytes(U256::from(1_000u64)).to_vec(),
+            eth_value: utils::u256_to_bytes(U256::from(900u64)).to_vec(),
             signed_at: SqliteTimestamp(Utc::now()),
         })
         .execute(&mut *conn)

server/crates/arbiter-server/src/evm/policies/token_transfers/mod.rs

@@ -38,9 +38,9 @@ fn grant_join() -> _ {
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct Meaning {
-    token: &'static TokenInfo,
-    to: Address,
-    value: U256,
+    pub(crate) token: &'static TokenInfo,
+    pub(crate) to: Address,
+    pub(crate) value: U256,
 }
 impl std::fmt::Display for Meaning {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
@@ -101,6 +101,7 @@ async fn query_relevant_past_transfers(
 
 async fn check_volume_rate_limits(
     grant: &Grant<Settings>,
+    current_transfer_value: U256,
     db: &mut impl AsyncConnection<Backend = Sqlite>,
 ) -> QueryResult<Vec<EvalViolation>> {
     let mut violations = Vec::new();
@@ -113,12 +114,12 @@ async fn check_volume_rate_limits(
 
     for limit in &grant.settings.volume_limits {
         let window_start = chrono::Utc::now() - limit.window;
-        let cumulative_volume: U256 = past_transfers
+        let prospective_cumulative_volume: U256 = past_transfers
             .iter()
             .filter(|(_, timestamp)| timestamp >= &window_start)
-            .fold(U256::default(), |acc, (value, _)| acc + *value);
+            .fold(current_transfer_value, |acc, (value, _)| acc + *value);
 
-        if cumulative_volume > limit.max_volume {
+        if prospective_cumulative_volume > limit.max_volume {
             violations.push(EvalViolation::VolumetricLimitExceeded);
             break;
         }
@@ -163,7 +164,7 @@ impl Policy for TokenTransfer {
             violations.push(EvalViolation::InvalidTarget { target: meaning.to });
         }
 
-        let rate_violations = check_volume_rate_limits(grant, db).await?;
+        let rate_violations = check_volume_rate_limits(grant, meaning.value, db).await?;
         violations.extend(rate_violations);
 
         Ok(violations)
@@ -209,8 +210,7 @@ impl Policy for TokenTransfer {
 
         let grant: Option<(EvmBasicGrant, EvmTokenTransferGrant)> = grant_join()
             .filter(evm_basic_grant::revoked_at.is_null())
-            .filter(evm_basic_grant::wallet_id.eq(context.wallet_id))
-            .filter(evm_basic_grant::client_id.eq(context.client_id))
+            .filter(evm_basic_grant::wallet_access_id.eq(context.target.id))
             .filter(evm_token_transfer_grant::token_contract.eq(&token_contract_bytes))
             .select((
                 EvmBasicGrant::as_select(),

server/crates/arbiter-server/src/evm/policies/token_transfers/tests.rs

@@ -6,7 +6,7 @@ use diesel_async::RunQueryDsl;
 
 use crate::db::{
     self, DatabaseConnection,
-    models::{EvmBasicGrant, NewEvmBasicGrant, SqliteTimestamp},
+    models::{EvmBasicGrant, EvmWalletAccess, NewEvmBasicGrant, SqliteTimestamp},
     schema::evm_basic_grant,
 };
 use crate::evm::{
@@ -21,8 +21,7 @@ use super::{Settings, TokenTransfer};
 const CHAIN_ID: u64 = 1;
 const DAI: Address = address!("6B175474E89094C44Da98b954EedeAC495271d0F");
 
-const WALLET_ID: i32 = 1;
-const CLIENT_ID: i32 = 2;
+const WALLET_ACCESS_ID: i32 = 1;
 
 const RECIPIENT: Address = address!("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
 const OTHER: Address = address!("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
@@ -38,8 +37,12 @@ fn transfer_calldata(to: Address, value: U256) -> Bytes {
 
 fn ctx(to: Address, calldata: Bytes) -> EvalContext {
     EvalContext {
-        wallet_id: WALLET_ID,
-        client_id: CLIENT_ID,
+        target: EvmWalletAccess {
+            id: WALLET_ACCESS_ID,
+            wallet_id: 10,
+            client_id: 20,
+            created_at: SqliteTimestamp(Utc::now()),
+        },
         chain: CHAIN_ID,
         to,
         value: U256::ZERO,
@@ -52,8 +55,7 @@ fn ctx(to: Address, calldata: Bytes) -> EvalContext {
 async fn insert_basic(conn: &mut DatabaseConnection, revoked: bool) -> EvmBasicGrant {
     insert_into(evm_basic_grant::table)
         .values(NewEvmBasicGrant {
-            wallet_id: WALLET_ID,
-            client_id: CLIENT_ID,
+            wallet_access_id: WALLET_ACCESS_ID,
             chain_id: CHAIN_ID as i32,
             valid_from: None,
             valid_until: None,
@@ -86,14 +88,13 @@ fn make_settings(target: Option<Address>, max_volume: Option<u64>) -> Settings {
 
 fn shared() -> SharedGrantSettings {
     SharedGrantSettings {
-        wallet_id: WALLET_ID,
+        wallet_access_id: WALLET_ACCESS_ID,
         chain: CHAIN_ID,
         valid_from: None,
         valid_until: None,
         max_gas_fee_per_gas: None,
         max_priority_fee_per_gas: None,
         rate_limit: None,
-        client_id: CLIENT_ID,
     }
 }
 
@@ -219,7 +220,7 @@ async fn evaluate_rejects_wrong_restricted_recipient() {
 }
 
 #[tokio::test]
-async fn evaluate_passes_volume_within_limit() {
+async fn evaluate_passes_volume_at_exact_limit() {
     let db = db::create_test_pool().await;
     let mut conn = db.get().await.unwrap();
 
@@ -229,7 +230,7 @@ async fn evaluate_passes_volume_within_limit() {
         .await
         .unwrap();
 
-    // Record a past transfer of 500 (within 1000 limit)
+    // Record a past transfer of 900, with current transfer 100 => exactly 1000 limit
     use crate::db::{models::NewEvmTokenTransferLog, schema::evm_token_transfer_log};
     insert_into(evm_token_transfer_log::table)
         .values(NewEvmTokenTransferLog {
@@ -238,7 +239,7 @@ async fn evaluate_passes_volume_within_limit() {
             chain_id: CHAIN_ID as i32,
             token_contract: DAI.to_vec(),
             recipient_address: RECIPIENT.to_vec(),
-            value: utils::u256_to_bytes(U256::from(500u64)).to_vec(),
+            value: utils::u256_to_bytes(U256::from(900u64)).to_vec(),
         })
         .execute(&mut *conn)
         .await
@@ -281,7 +282,7 @@ async fn evaluate_rejects_volume_over_limit() {
             chain_id: CHAIN_ID as i32,
             token_contract: DAI.to_vec(),
             recipient_address: RECIPIENT.to_vec(),
-            value: utils::u256_to_bytes(U256::from(1_001u64)).to_vec(),
+            value: utils::u256_to_bytes(U256::from(1_000u64)).to_vec(),
         })
         .execute(&mut *conn)
         .await
@@ -293,7 +294,7 @@ async fn evaluate_rejects_volume_over_limit() {
         shared: shared(),
         settings,
     };
-    let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
+    let calldata = transfer_calldata(RECIPIENT, U256::from(1u64));
     let context = ctx(DAI, calldata);
     let m = TokenTransfer::analyze(&context).unwrap();
     let v = TokenTransfer::evaluate(&context, &m, &grant, &mut *conn)

server/crates/arbiter-server/src/grpc/client.rs

@@ -1,137 +1,116 @@
 use arbiter_proto::{
     proto::client::{
-        AuthChallenge as ProtoAuthChallenge,
-        AuthChallengeRequest as ProtoAuthChallengeRequest,
-        AuthChallengeSolution as ProtoAuthChallengeSolution, AuthOk as ProtoAuthOk,
-        ClientConnectError, ClientRequest, ClientResponse,
-        client_connect_error::Code as ProtoClientConnectErrorCode,
-        client_request::Payload as ClientRequestPayload,
+        ClientRequest, ClientResponse, client_request::Payload as ClientRequestPayload,
         client_response::Payload as ClientResponsePayload,
     },
-    transport::{Bi, Error as TransportError},
+    transport::{Receiver, Sender, grpc::GrpcBi},
 };
-use async_trait::async_trait;
-use futures::StreamExt as _;
-use tokio::sync::mpsc;
-use tonic::{Status, Streaming};
+use kameo::actor::{ActorRef, Spawn as _};
+use tonic::Status;
+use tracing::{info, warn};
 
-use crate::actors::client::{
-    self, ClientError, ConnectErrorCode, Request as DomainRequest, Response as DomainResponse,
+use crate::{
+    actors::client::{ClientConnection, session::ClientSession},
+    grpc::request_tracker::RequestTracker,
 };
 
-pub struct GrpcTransport {
-    sender: mpsc::Sender<Result<ClientResponse, Status>>,
-    receiver: Streaming<ClientRequest>,
-}
+mod auth;
+mod evm;
+mod inbound;
+mod outbound;
+mod vault;
 
-impl GrpcTransport {
-    pub fn new(
-        sender: mpsc::Sender<Result<ClientResponse, Status>>,
-        receiver: Streaming<ClientRequest>,
-    ) -> Self {
-        Self { sender, receiver }
-    }
+async fn dispatch_loop(
+    mut bi: GrpcBi<ClientRequest, ClientResponse>,
+    actor: ActorRef<ClientSession>,
+    mut request_tracker: RequestTracker,
+) {
+    loop {
+        let Some(message) = bi.recv().await else {
+            return;
+        };
 
-    fn request_to_domain(request: ClientRequest) -> Result<DomainRequest, Status> {
-        match request.payload {
-            Some(ClientRequestPayload::AuthChallengeRequest(ProtoAuthChallengeRequest {
-                pubkey,
-            })) => Ok(DomainRequest::AuthChallengeRequest { pubkey }),
-            Some(ClientRequestPayload::AuthChallengeSolution(
-                ProtoAuthChallengeSolution { signature },
-            )) => Ok(DomainRequest::AuthChallengeSolution { signature }),
-            None => Err(Status::invalid_argument("Missing client request payload")),
-        }
-    }
-
-    fn response_to_proto(response: DomainResponse) -> ClientResponse {
-        let payload = match response {
-            DomainResponse::AuthChallenge { pubkey, nonce } => {
-                ClientResponsePayload::AuthChallenge(ProtoAuthChallenge { pubkey, nonce })
-            }
-            DomainResponse::AuthOk => ClientResponsePayload::AuthOk(ProtoAuthOk {}),
-            DomainResponse::ClientConnectError { code } => {
-                ClientResponsePayload::ClientConnectError(ClientConnectError {
-                    code: match code {
-                        ConnectErrorCode::Unknown => ProtoClientConnectErrorCode::Unknown,
-                        ConnectErrorCode::ApprovalDenied => {
-                            ProtoClientConnectErrorCode::ApprovalDenied
-                        }
-                        ConnectErrorCode::NoUserAgentsOnline => {
-                            ProtoClientConnectErrorCode::NoUserAgentsOnline
-                        }
-                    }
-                    .into(),
-                })
+        let conn = match message {
+            Ok(conn) => conn,
+            Err(err) => {
+                warn!(error = ?err, "Failed to receive client request");
+                return;
             }
         };
 
-        ClientResponse {
-            payload: Some(payload),
+        let request_id = match request_tracker.request(conn.request_id) {
+            Ok(id) => id,
+            Err(err) => {
+                let _ = bi.send(Err(err)).await;
+                return;
             }
-    }
-
-    fn error_to_status(value: ClientError) -> Status {
-        match value {
-            ClientError::MissingRequestPayload | ClientError::UnexpectedRequestPayload => {
-                Status::invalid_argument("Expected message with payload")
-            }
-            ClientError::StateTransitionFailed => Status::internal("State machine error"),
-            ClientError::Auth(ref err) => auth_error_status(err),
-            ClientError::ConnectionRegistrationFailed => {
-                Status::internal("Connection registration failed")
-            }
-        }
-    }
-}
-
-#[async_trait]
-impl Bi<DomainRequest, Result<DomainResponse, ClientError>> for GrpcTransport {
-    async fn send(&mut self, item: Result<DomainResponse, ClientError>) -> Result<(), TransportError> {
-        let outbound = match item {
-            Ok(message) => Ok(Self::response_to_proto(message)),
-            Err(err) => Err(Self::error_to_status(err)),
         };
 
-        self.sender
-            .send(outbound)
+        let Some(payload) = conn.payload else {
+            let _ = bi
+                .send(Err(Status::invalid_argument(
+                    "Missing client request payload",
+                )))
+                .await;
+            return;
+        };
+
+        match dispatch_inner(&actor, payload).await {
+            Ok(response) => {
+                if bi
+                    .send(Ok(ClientResponse {
+                        request_id: Some(request_id),
+                        payload: Some(response),
+                    }))
                     .await
-            .map_err(|_| TransportError::ChannelClosed)
+                    .is_err()
+                {
+                    return;
+                }
             }
-
-    async fn recv(&mut self) -> Option<DomainRequest> {
-        match self.receiver.next().await {
-            Some(Ok(item)) => match Self::request_to_domain(item) {
-                Ok(request) => Some(request),
             Err(status) => {
-                    let _ = self.sender.send(Err(status)).await;
-                    None
+                let _ = bi.send(Err(status)).await;
+                return;
             }
-            },
-            Some(Err(error)) => {
-                tracing::error!(error = ?error, "grpc client recv failed; closing stream");
-                None
-            }
-            None => None,
         }
     }
 }
 
-fn auth_error_status(value: &client::auth::Error) -> Status {
-    use client::auth::Error;
+async fn dispatch_inner(
+    actor: &ActorRef<ClientSession>,
+    payload: ClientRequestPayload,
+) -> Result<ClientResponsePayload, Status> {
+    match payload {
+        ClientRequestPayload::Vault(req) => vault::dispatch(actor, req).await,
+        ClientRequestPayload::Evm(req) => evm::dispatch(actor, req).await,
+        ClientRequestPayload::Auth(..) => {
+            warn!("Unsupported post-auth client auth request");
+            Err(Status::invalid_argument("Unsupported client request"))
+        }
+    }
+}
 
-    match value {
-        Error::UnexpectedMessagePayload | Error::InvalidClientPubkeyLength => {
-            Status::invalid_argument(value.to_string())
-        }
-        Error::InvalidAuthPubkeyEncoding => {
-            Status::invalid_argument("Failed to convert pubkey to VerifyingKey")
-        }
-        Error::InvalidChallengeSolution => Status::unauthenticated(value.to_string()),
-        Error::ApproveError(_) => Status::permission_denied(value.to_string()),
-        Error::Transport => Status::internal("Transport error"),
-        Error::DatabasePoolUnavailable => Status::internal("Database pool error"),
-        Error::DatabaseOperationFailed => Status::internal("Database error"),
-        Error::InternalError => Status::internal("Internal error"),
+pub async fn start(mut conn: ClientConnection, mut bi: GrpcBi<ClientRequest, ClientResponse>) {
+    let mut request_tracker = RequestTracker::default();
+
+    let client_id = match auth::start(&mut conn, &mut bi, &mut request_tracker).await {
+        Ok(id) => id,
+        Err(err) => {
+            let _ = bi
+                .send(Err(Status::unauthenticated(format!(
+                    "Authentication failed: {}",
+                    err
+                ))))
+                .await;
+            warn!(error = ?err, "Client authentication failed");
+            return;
         }
+    };
+
+    let actor = ClientSession::spawn(ClientSession::new(conn, client_id));
+    let actor_for_cleanup = actor.clone();
+
+    info!("Client authenticated successfully");
+    dispatch_loop(bi, actor, request_tracker).await;
+    actor_for_cleanup.kill();
 }

server/crates/arbiter-server/src/grpc/client/auth.rs

@@ -0,0 +1,205 @@
+use arbiter_proto::{
+    ClientMetadata,
+    proto::{
+        client::{
+            ClientRequest, ClientResponse,
+            auth::{
+                self as proto_auth, AuthChallenge as ProtoAuthChallenge,
+                AuthChallengeRequest as ProtoAuthChallengeRequest,
+                AuthChallengeSolution as ProtoAuthChallengeSolution, AuthResult as ProtoAuthResult,
+                request::Payload as AuthRequestPayload, response::Payload as AuthResponsePayload,
+            },
+            client_request::Payload as ClientRequestPayload,
+            client_response::Payload as ClientResponsePayload,
+        },
+        shared::ClientInfo as ProtoClientInfo,
+    },
+    transport::{Bi, Error as TransportError, Receiver, Sender, grpc::GrpcBi},
+};
+use async_trait::async_trait;
+use tonic::Status;
+use tracing::warn;
+
+use crate::{
+    actors::client::{self, ClientConnection, auth},
+    grpc::request_tracker::RequestTracker,
+};
+
+pub struct AuthTransportAdapter<'a> {
+    bi: &'a mut GrpcBi<ClientRequest, ClientResponse>,
+    request_tracker: &'a mut RequestTracker,
+}
+
+impl<'a> AuthTransportAdapter<'a> {
+    pub fn new(
+        bi: &'a mut GrpcBi<ClientRequest, ClientResponse>,
+        request_tracker: &'a mut RequestTracker,
+    ) -> Self {
+        Self {
+            bi,
+            request_tracker,
+        }
+    }
+
+    fn response_to_proto(response: auth::Outbound) -> AuthResponsePayload {
+        match response {
+            auth::Outbound::AuthChallenge { pubkey, nonce } => {
+                AuthResponsePayload::Challenge(ProtoAuthChallenge {
+                    pubkey: pubkey.to_bytes().to_vec(),
+                    nonce,
+                })
+            }
+            auth::Outbound::AuthSuccess => {
+                AuthResponsePayload::Result(ProtoAuthResult::Success.into())
+            }
+        }
+    }
+
+    fn error_to_proto(error: auth::Error) -> AuthResponsePayload {
+        AuthResponsePayload::Result(
+            match error {
+                auth::Error::InvalidChallengeSolution => ProtoAuthResult::InvalidSignature,
+                auth::Error::ApproveError(auth::ApproveError::Denied) => {
+                    ProtoAuthResult::ApprovalDenied
+                }
+                auth::Error::ApproveError(auth::ApproveError::Upstream(
+                    crate::actors::flow_coordinator::ApprovalError::NoUserAgentsConnected,
+                )) => ProtoAuthResult::NoUserAgentsOnline,
+                auth::Error::ApproveError(auth::ApproveError::Internal)
+                | auth::Error::DatabasePoolUnavailable
+                | auth::Error::DatabaseOperationFailed
+                | auth::Error::Transport => ProtoAuthResult::Internal,
+            }
+            .into(),
+        )
+    }
+
+    async fn send_client_response(
+        &mut self,
+        payload: AuthResponsePayload,
+    ) -> Result<(), TransportError> {
+        self.bi
+            .send(Ok(ClientResponse {
+                request_id: Some(self.request_tracker.current_request_id()),
+                payload: Some(ClientResponsePayload::Auth(proto_auth::Response {
+                    payload: Some(payload),
+                })),
+            }))
+            .await
+    }
+
+    async fn send_auth_result(&mut self, result: ProtoAuthResult) -> Result<(), TransportError> {
+        self.send_client_response(AuthResponsePayload::Result(result.into()))
+            .await
+    }
+}
+
+#[async_trait]
+impl Sender<Result<auth::Outbound, auth::Error>> for AuthTransportAdapter<'_> {
+    async fn send(
+        &mut self,
+        item: Result<auth::Outbound, auth::Error>,
+    ) -> Result<(), TransportError> {
+        let payload = match item {
+            Ok(message) => AuthTransportAdapter::response_to_proto(message),
+            Err(err) => AuthTransportAdapter::error_to_proto(err),
+        };
+
+        self.send_client_response(payload).await
+    }
+}
+
+#[async_trait]
+impl Receiver<auth::Inbound> for AuthTransportAdapter<'_> {
+    async fn recv(&mut self) -> Option<auth::Inbound> {
+        let request = match self.bi.recv().await? {
+            Ok(request) => request,
+            Err(error) => {
+                warn!(error = ?error, "grpc client recv failed; closing stream");
+                return None;
+            }
+        };
+
+        match self.request_tracker.request(request.request_id) {
+            Ok(request_id) => request_id,
+            Err(error) => {
+                let _ = self.bi.send(Err(error)).await;
+                return None;
+            }
+        };
+        let payload = request.payload?;
+        let ClientRequestPayload::Auth(auth_request) = payload else {
+            let _ = self
+                .bi
+                .send(Err(Status::invalid_argument(
+                    "Unsupported client auth request",
+                )))
+                .await;
+            return None;
+        };
+        let Some(payload) = auth_request.payload else {
+            let _ = self
+                .bi
+                .send(Err(Status::invalid_argument("Missing client auth request payload")))
+                .await;
+            return None;
+        };
+
+        match payload {
+            AuthRequestPayload::ChallengeRequest(ProtoAuthChallengeRequest {
+                pubkey,
+                client_info,
+            }) => {
+                let Some(client_info) = client_info else {
+                    let _ = self
+                        .bi
+                        .send(Err(Status::invalid_argument("Missing client info")))
+                        .await;
+                    return None;
+                };
+                let Ok(pubkey) = <[u8; 32]>::try_from(pubkey) else {
+                    let _ = self.send_auth_result(ProtoAuthResult::InvalidKey).await;
+                    return None;
+                };
+                let Ok(pubkey) = ed25519_dalek::VerifyingKey::from_bytes(&pubkey) else {
+                    let _ = self.send_auth_result(ProtoAuthResult::InvalidKey).await;
+                    return None;
+                };
+                Some(auth::Inbound::AuthChallengeRequest {
+                    pubkey,
+                    metadata: client_metadata_from_proto(client_info),
+                })
+            }
+            AuthRequestPayload::ChallengeSolution(ProtoAuthChallengeSolution {
+                signature,
+            }) => {
+                let Ok(signature) = ed25519_dalek::Signature::try_from(signature.as_slice()) else {
+                    let _ = self
+                        .send_auth_result(ProtoAuthResult::InvalidSignature)
+                        .await;
+                    return None;
+                };
+                Some(auth::Inbound::AuthChallengeSolution { signature })
+            }
+        }
+    }
+}
+
+impl Bi<auth::Inbound, Result<auth::Outbound, auth::Error>> for AuthTransportAdapter<'_> {}
+
+fn client_metadata_from_proto(metadata: ProtoClientInfo) -> ClientMetadata {
+    ClientMetadata {
+        name: metadata.name,
+        description: metadata.description,
+        version: metadata.version,
+    }
+}
+
+pub async fn start(
+    conn: &mut ClientConnection,
+    bi: &mut GrpcBi<ClientRequest, ClientResponse>,
+    request_tracker: &mut RequestTracker,
+) -> Result<i32, auth::Error> {
+    let mut transport = AuthTransportAdapter::new(bi, request_tracker);
+    client::auth::authenticate(conn, &mut transport).await
+}

server/crates/arbiter-server/src/grpc/client/evm.rs

@@ -0,0 +1,85 @@
+use arbiter_proto::proto::{
+    client::{
+        client_response::Payload as ClientResponsePayload,
+        evm::{
+            self as proto_evm, request::Payload as EvmRequestPayload,
+            response::Payload as EvmResponsePayload,
+        },
+    },
+    evm::{
+        EvmError as ProtoEvmError, EvmSignTransactionResponse,
+        evm_sign_transaction_response::Result as EvmSignTransactionResult,
+    },
+};
+use kameo::actor::ActorRef;
+use tonic::Status;
+use tracing::warn;
+
+use crate::{
+    actors::client::session::{ClientSession, HandleSignTransaction, SignTransactionRpcError},
+    grpc::{
+        Convert, TryConvert,
+        common::inbound::{RawEvmAddress, RawEvmTransaction},
+    },
+};
+
+fn wrap_response(payload: EvmResponsePayload) -> ClientResponsePayload {
+    ClientResponsePayload::Evm(proto_evm::Response {
+        payload: Some(payload),
+    })
+}
+
+pub(super) async fn dispatch(
+    actor: &ActorRef<ClientSession>,
+    req: proto_evm::Request,
+) -> Result<ClientResponsePayload, Status> {
+    let Some(payload) = req.payload else {
+        return Err(Status::invalid_argument("Missing client EVM request payload"));
+    };
+
+    match payload {
+        EvmRequestPayload::SignTransaction(request) => {
+            let address = RawEvmAddress(request.wallet_address).try_convert()?;
+            let transaction = RawEvmTransaction(request.rlp_transaction).try_convert()?;
+
+            let response = match actor
+                .ask(HandleSignTransaction {
+                    wallet_address: address,
+                    transaction,
+                })
+                .await
+            {
+                Ok(signature) => EvmSignTransactionResponse {
+                    result: Some(EvmSignTransactionResult::Signature(
+                        signature.as_bytes().to_vec(),
+                    )),
+                },
+                Err(kameo::error::SendError::HandlerError(SignTransactionRpcError::Vet(
+                    vet_error,
+                ))) => EvmSignTransactionResponse {
+                    result: Some(vet_error.convert()),
+                },
+                Err(kameo::error::SendError::HandlerError(
+                    SignTransactionRpcError::Internal,
+                )) => EvmSignTransactionResponse {
+                    result: Some(EvmSignTransactionResult::Error(
+                        ProtoEvmError::Internal.into(),
+                    )),
+                },
+                Err(err) => {
+                    warn!(error = ?err, "Failed to sign EVM transaction");
+                    EvmSignTransactionResponse {
+                        result: Some(EvmSignTransactionResult::Error(
+                            ProtoEvmError::Internal.into(),
+                        )),
+                    }
+                }
+            };
+
+            Ok(wrap_response(EvmResponsePayload::SignTransaction(response)))
+        }
+        EvmRequestPayload::AnalyzeTransaction(_) => {
+            Err(Status::unimplemented("EVM transaction analysis is not yet implemented"))
+        }
+    }
+}

server/crates/arbiter-server/src/grpc/client/vault.rs

@@ -0,0 +1,47 @@
+use arbiter_proto::proto::{
+    client::{
+        client_response::Payload as ClientResponsePayload,
+        vault::{
+            self as proto_vault, request::Payload as VaultRequestPayload,
+            response::Payload as VaultResponsePayload,
+        },
+    },
+    shared::VaultState as ProtoVaultState,
+};
+use kameo::{actor::ActorRef, error::SendError};
+use tonic::Status;
+use tracing::warn;
+
+use crate::{
+    actors::{
+        client::session::{ClientSession, Error, HandleQueryVaultState},
+        keyholder::KeyHolderState,
+    },
+};
+
+pub(super) async fn dispatch(
+    actor: &ActorRef<ClientSession>,
+    req: proto_vault::Request,
+) -> Result<ClientResponsePayload, Status> {
+    let Some(payload) = req.payload else {
+        return Err(Status::invalid_argument("Missing client vault request payload"));
+    };
+
+    match payload {
+        VaultRequestPayload::QueryState(_) => {
+            let state = match actor.ask(HandleQueryVaultState {}).await {
+                Ok(KeyHolderState::Unbootstrapped) => ProtoVaultState::Unbootstrapped,
+                Ok(KeyHolderState::Sealed) => ProtoVaultState::Sealed,
+                Ok(KeyHolderState::Unsealed) => ProtoVaultState::Unsealed,
+                Err(SendError::HandlerError(Error::Internal)) => ProtoVaultState::Error,
+                Err(err) => {
+                    warn!(error = ?err, "Failed to query vault state");
+                    ProtoVaultState::Error
+                }
+            };
+            Ok(ClientResponsePayload::Vault(proto_vault::Response {
+                payload: Some(VaultResponsePayload::State(state.into())),
+            }))
+        }
+    }
+}

server/crates/arbiter-server/src/grpc/common.rs

@@ -0,0 +1,2 @@
+pub mod inbound;
+pub mod outbound;

server/crates/arbiter-server/src/grpc/common/inbound.rs

@@ -0,0 +1,36 @@
+use alloy::{consensus::TxEip1559, primitives::Address, rlp::Decodable as _};
+
+use crate::grpc::TryConvert;
+
+pub struct RawEvmAddress(pub Vec<u8>);
+impl TryConvert for RawEvmAddress {
+    type Output = Address;
+
+    type Error = tonic::Status;
+
+    fn try_convert(self) -> Result<Self::Output, Self::Error> {
+        let wallet_address = match <[u8; 20]>::try_from(self.0.as_slice()) {
+            Ok(address) => Address::from(address),
+            Err(_) => {
+                return Err(tonic::Status::invalid_argument(
+                    "Invalid EVM wallet address",
+                ));
+            }
+        };
+        Ok(wallet_address)
+    }
+}
+
+pub struct RawEvmTransaction(pub Vec<u8>);
+impl TryConvert for RawEvmTransaction {
+    type Output = TxEip1559;
+
+    type Error = tonic::Status;
+
+    fn try_convert(self) -> Result<Self::Output, Self::Error> {
+        let tx = TxEip1559::decode(&mut self.0.as_slice()).map_err(|_| {
+            tonic::Status::invalid_argument("Invalid EVM transaction format")
+        })?;
+        Ok(tx)
+    }
+}

server/crates/arbiter-server/src/grpc/common/outbound.rs

@@ -0,0 +1,116 @@
+use alloy::primitives::U256;
+use arbiter_proto::proto::{
+    evm::{EvmError as ProtoEvmError, evm_sign_transaction_response::Result as EvmSignTransactionResult},
+    shared::evm::{
+        EvalViolation as ProtoEvalViolation, GasLimitExceededViolation,
+        NoMatchingGrantError, PolicyViolationsError, SpecificMeaning as ProtoSpecificMeaning,
+        TokenInfo as ProtoTokenInfo, TransactionEvalError as ProtoTransactionEvalError,
+        eval_violation::Kind as ProtoEvalViolationKind,
+        specific_meaning::Meaning as ProtoSpecificMeaningKind,
+        transaction_eval_error::Kind as ProtoTransactionEvalErrorKind,
+    },
+};
+
+use crate::{
+    evm::{
+        PolicyError, VetError,
+        policies::{EvalViolation, SpecificMeaning},
+    },
+    grpc::Convert,
+};
+
+fn u256_to_proto_bytes(value: U256) -> Vec<u8> {
+    value.to_be_bytes::<32>().to_vec()
+}
+
+impl Convert for SpecificMeaning {
+    type Output = ProtoSpecificMeaning;
+
+    fn convert(self) -> Self::Output {
+        let kind = match self {
+            SpecificMeaning::EtherTransfer(meaning) => ProtoSpecificMeaningKind::EtherTransfer(
+                arbiter_proto::proto::shared::evm::EtherTransferMeaning {
+                    to: meaning.to.to_vec(),
+                    value: u256_to_proto_bytes(meaning.value),
+                },
+            ),
+            SpecificMeaning::TokenTransfer(meaning) => ProtoSpecificMeaningKind::TokenTransfer(
+                arbiter_proto::proto::shared::evm::TokenTransferMeaning {
+                    token: Some(ProtoTokenInfo {
+                        symbol: meaning.token.symbol.to_string(),
+                        address: meaning.token.contract.to_vec(),
+                        chain_id: meaning.token.chain,
+                    }),
+                    to: meaning.to.to_vec(),
+                    value: u256_to_proto_bytes(meaning.value),
+                },
+            ),
+        };
+
+        ProtoSpecificMeaning {
+            meaning: Some(kind),
+        }
+    }
+}
+
+impl Convert for EvalViolation {
+    type Output = ProtoEvalViolation;
+
+    fn convert(self) -> Self::Output {
+        let kind = match self {
+            EvalViolation::InvalidTarget { target } => {
+                ProtoEvalViolationKind::InvalidTarget(target.to_vec())
+            }
+            EvalViolation::GasLimitExceeded {
+                max_gas_fee_per_gas,
+                max_priority_fee_per_gas,
+            } => ProtoEvalViolationKind::GasLimitExceeded(GasLimitExceededViolation {
+                max_gas_fee_per_gas: max_gas_fee_per_gas.map(u256_to_proto_bytes),
+                max_priority_fee_per_gas: max_priority_fee_per_gas.map(u256_to_proto_bytes),
+            }),
+            EvalViolation::RateLimitExceeded => ProtoEvalViolationKind::RateLimitExceeded(()),
+            EvalViolation::VolumetricLimitExceeded => {
+                ProtoEvalViolationKind::VolumetricLimitExceeded(())
+            }
+            EvalViolation::InvalidTime => ProtoEvalViolationKind::InvalidTime(()),
+            EvalViolation::InvalidTransactionType => {
+                ProtoEvalViolationKind::InvalidTransactionType(())
+            }
+        };
+
+        ProtoEvalViolation { kind: Some(kind) }
+    }
+}
+
+impl Convert for VetError {
+    type Output = EvmSignTransactionResult;
+
+    fn convert(self) -> Self::Output {
+        let kind = match self {
+            VetError::ContractCreationNotSupported => {
+                ProtoTransactionEvalErrorKind::ContractCreationNotSupported(())
+            }
+            VetError::UnsupportedTransactionType => {
+                ProtoTransactionEvalErrorKind::UnsupportedTransactionType(())
+            }
+            VetError::Evaluated(meaning, policy_error) => match policy_error {
+                PolicyError::NoMatchingGrant => {
+                    ProtoTransactionEvalErrorKind::NoMatchingGrant(NoMatchingGrantError {
+                        meaning: Some(meaning.convert()),
+                    })
+                }
+                PolicyError::Violations(violations) => {
+                    ProtoTransactionEvalErrorKind::PolicyViolations(PolicyViolationsError {
+                        meaning: Some(meaning.convert()),
+                        violations: violations.into_iter().map(Convert::convert).collect(),
+                    })
+                }
+                PolicyError::Database(_) => {
+                    return EvmSignTransactionResult::Error(ProtoEvmError::Internal.into());
+                }
+            },
+        };
+
+        EvmSignTransactionResult::EvalError(ProtoTransactionEvalError { kind: Some(kind) }.into())
+    }
+}

server/crates/arbiter-server/src/grpc/mod.rs

@@ -1,21 +1,39 @@
-
-use arbiter_proto::proto::{
+use arbiter_proto::{
+    proto::{
         client::{ClientRequest, ClientResponse},
         user_agent::{UserAgentRequest, UserAgentResponse},
+    },
+    transport::grpc::GrpcBi,
 };
-use tokio::sync::mpsc;
 use tokio_stream::wrappers::ReceiverStream;
 use tonic::{Request, Response, Status, async_trait};
 use tracing::info;
 
 use crate::{
-    DEFAULT_CHANNEL_SIZE,
-    actors::{client::{ClientConnection, connect_client}, user_agent::{UserAgentConnection, connect_user_agent}},
+    actors::{client::ClientConnection, user_agent::UserAgentConnection},
+    grpc::user_agent::start,
 };
 
+mod request_tracker;
+
 pub mod client;
 pub mod user_agent;
 
+mod common;
+
+pub trait Convert {
+    type Output;
+
+    fn convert(self) -> Self::Output;
+}
+
+pub trait TryConvert {
+    type Output;
+    type Error;
+
+    fn try_convert(self) -> Result<Self::Output, Self::Error>;
+}
+
 #[async_trait]
 impl arbiter_proto::proto::arbiter_service_server::ArbiterService for super::Server {
     type UserAgentStream = ReceiverStream<Result<UserAgentResponse, Status>>;
@@ -27,19 +45,13 @@ impl arbiter_proto::proto::arbiter_service_server::ArbiterService for super::Ser
         request: Request<tonic::Streaming<ClientRequest>>,
     ) -> Result<Response<Self::ClientStream>, Status> {
         let req_stream = request.into_inner();
-        let (tx, rx) = mpsc::channel(DEFAULT_CHANNEL_SIZE);
-
-        let transport = client::GrpcTransport::new(tx, req_stream);
-        let props = ClientConnection::new(
-            self.context.db.clone(),
-            Box::new(transport),
-            self.context.actors.clone(),
-        );
-        tokio::spawn(connect_client(props));
+        let (bi, rx) = GrpcBi::from_bi_stream(req_stream);
+        let props = ClientConnection::new(self.context.db.clone(), self.context.actors.clone());
+        tokio::spawn(client::start(props, bi));
 
         info!(event = "connection established", "grpc.client");
 
-        Ok(Response::new(ReceiverStream::new(rx)))
+        Ok(Response::new(rx))
     }
 
     #[tracing::instrument(level = "debug", skip(self))]
@@ -48,18 +60,19 @@ impl arbiter_proto::proto::arbiter_service_server::ArbiterService for super::Ser
         request: Request<tonic::Streaming<UserAgentRequest>>,
     ) -> Result<Response<Self::UserAgentStream>, Status> {
         let req_stream = request.into_inner();
-        let (tx, rx) = mpsc::channel(DEFAULT_CHANNEL_SIZE);
 
-        let transport = user_agent::GrpcTransport::new(tx, req_stream);
-        let props = UserAgentConnection::new(
-            self.context.db.clone(),
-            self.context.actors.clone(),
-            Box::new(transport),
-        );
-        tokio::spawn(connect_user_agent(props));
+        let (bi, rx) = GrpcBi::from_bi_stream(req_stream);
+
+        tokio::spawn(start(
+            UserAgentConnection {
+                db: self.context.db.clone(),
+                actors: self.context.actors.clone(),
+            },
+            bi,
+        ));
 
         info!(event = "connection established", "grpc.user_agent");
 
-        Ok(Response::new(ReceiverStream::new(rx)))
+        Ok(Response::new(rx))
     }
 }

server/crates/arbiter-server/src/grpc/request_tracker.rs

@@ -0,0 +1,26 @@
+use tonic::Status;
+
+#[derive(Default)]
+pub struct RequestTracker {
+    next_request_id: i32,
+}
+
+impl RequestTracker {
+    pub fn request(&mut self, id: i32) -> Result<i32, Status> {
+        if id < self.next_request_id {
+            return Err(Status::invalid_argument("Duplicate request id"));
+        }
+
+        self.next_request_id = id
+            .checked_add(1)
+            .ok_or_else(|| Status::invalid_argument("Invalid request id"))?;
+
+        Ok(id)
+    }
+
+    // This is used to set the response id for auth responses, which need to match the request id of the auth challenge request.
+    // -1 offset is needed because request() increments the next_request_id after returning the current request id.
+    pub fn current_request_id(&self) -> i32 {
+        self.next_request_id - 1
+    }
+}

server/crates/arbiter-server/src/grpc/user_agent.rs

@@ -1,509 +1,145 @@
+use tokio::sync::mpsc;
+
 use arbiter_proto::{
     proto::{
-        self,
-        evm::{
-            EtherTransferSettings as ProtoEtherTransferSettings, EvmError as ProtoEvmError,
-            EvmGrantCreateRequest, EvmGrantCreateResponse, EvmGrantDeleteRequest,
-            EvmGrantDeleteResponse, EvmGrantList, EvmGrantListResponse, GrantEntry,
-            SharedSettings as ProtoSharedSettings, SpecificGrant as ProtoSpecificGrant,
-            TokenTransferSettings as ProtoTokenTransferSettings,
-            VolumeRateLimit as ProtoVolumeRateLimit, WalletCreateResponse, WalletEntry, WalletList,
-            WalletListResponse, evm_grant_create_response::Result as EvmGrantCreateResult,
-            evm_grant_delete_response::Result as EvmGrantDeleteResult,
-            evm_grant_list_response::Result as EvmGrantListResult,
-            specific_grant::Grant as ProtoSpecificGrantType,
-            wallet_create_response::Result as WalletCreateResult,
-            wallet_list_response::Result as WalletListResult,
-        },
         user_agent::{
-            AuthChallenge as ProtoAuthChallenge, AuthChallengeRequest as ProtoAuthChallengeRequest,
-            AuthChallengeSolution as ProtoAuthChallengeSolution, AuthOk as ProtoAuthOk,
-            BootstrapEncryptedKey as ProtoBootstrapEncryptedKey,
-            BootstrapResult as ProtoBootstrapResult, ClientConnectionCancel,
-            ClientConnectionRequest, ClientConnectionResponse, KeyType as ProtoKeyType,
-            UnsealEncryptedKey as ProtoUnsealEncryptedKey, UnsealResult as ProtoUnsealResult,
-            UnsealStart, UnsealStartResponse, UserAgentRequest, UserAgentResponse,
-            VaultState as ProtoVaultState, user_agent_request::Payload as UserAgentRequestPayload,
+            UserAgentRequest, UserAgentResponse,
+            user_agent_request::Payload as UserAgentRequestPayload,
             user_agent_response::Payload as UserAgentResponsePayload,
         },
     },
-    transport::{Bi, Error as TransportError},
+    transport::{Error as TransportError, Receiver, Sender, grpc::GrpcBi},
 };
 use async_trait::async_trait;
-use futures::StreamExt as _;
-use prost_types::Timestamp;
-use tokio::sync::mpsc;
-use tonic::{Status, Streaming};
+use kameo::actor::{ActorRef, Spawn as _};
+use tonic::Status;
+use tracing::{error, info, warn};
 
 use crate::{
-    actors::user_agent::{
-        self, AuthPublicKey, BootstrapError, Request as DomainRequest, Response as DomainResponse,
-        TransportResponseError, UnsealError, VaultState,
-    },
-    evm::{
-        policies::{Grant, SpecificGrant},
-        policies::{
-            SharedGrantSettings, TransactionRateLimit, VolumeRateLimit, ether_transfer,
-            token_transfers,
-        },
-    },
+    actors::user_agent::{OutOfBand, UserAgentConnection, UserAgentSession},
+    grpc::request_tracker::RequestTracker,
 };
-use alloy::primitives::{Address, U256};
-use chrono::{DateTime, TimeZone, Utc};
+mod auth;
+mod evm;
+mod inbound;
+mod outbound;
+mod sdk_client;
+mod vault;
 
-pub struct GrpcTransport {
-    sender: mpsc::Sender<Result<UserAgentResponse, Status>>,
-    receiver: Streaming<UserAgentRequest>,
-}
-
-impl GrpcTransport {
-    pub fn new(
-        sender: mpsc::Sender<Result<UserAgentResponse, Status>>,
-        receiver: Streaming<UserAgentRequest>,
-    ) -> Self {
-        Self { sender, receiver }
-    }
-
-    fn request_to_domain(request: UserAgentRequest) -> Result<DomainRequest, Status> {
-        match request.payload {
-            Some(UserAgentRequestPayload::AuthChallengeRequest(ProtoAuthChallengeRequest {
-                pubkey,
-                bootstrap_token,
-                key_type,
-            })) => Ok(DomainRequest::AuthChallengeRequest {
-                pubkey: parse_auth_pubkey(key_type, pubkey)?,
-                bootstrap_token,
-            }),
-            Some(UserAgentRequestPayload::AuthChallengeSolution(ProtoAuthChallengeSolution {
-                signature,
-            })) => Ok(DomainRequest::AuthChallengeSolution { signature }),
-            Some(UserAgentRequestPayload::UnsealStart(UnsealStart { client_pubkey })) => {
-                let client_pubkey: [u8; 32] = client_pubkey
-                    .as_slice()
-                    .try_into()
-                    .map_err(|_| Status::invalid_argument("client_pubkey must be 32 bytes"))?;
-                Ok(DomainRequest::UnsealStart {
-                    client_pubkey: x25519_dalek::PublicKey::from(client_pubkey),
-                })
-            }
-            Some(UserAgentRequestPayload::UnsealEncryptedKey(ProtoUnsealEncryptedKey {
-                nonce,
-                ciphertext,
-                associated_data,
-            })) => Ok(DomainRequest::UnsealEncryptedKey {
-                nonce,
-                ciphertext,
-                associated_data,
-            }),
-            Some(UserAgentRequestPayload::BootstrapEncryptedKey(ProtoBootstrapEncryptedKey {
-                nonce,
-                ciphertext,
-                associated_data,
-            })) => Ok(DomainRequest::BootstrapEncryptedKey {
-                nonce,
-                ciphertext,
-                associated_data,
-            }),
-            Some(UserAgentRequestPayload::QueryVaultState(_)) => Ok(DomainRequest::QueryVaultState),
-            Some(UserAgentRequestPayload::EvmWalletCreate(_)) => Ok(DomainRequest::EvmWalletCreate),
-            Some(UserAgentRequestPayload::EvmWalletList(_)) => Ok(DomainRequest::EvmWalletList),
-            Some(UserAgentRequestPayload::ClientConnectionResponse(ClientConnectionResponse {
-                approved,
-            })) => Ok(DomainRequest::ClientConnectionResponse { approved }),
-
-            Some(UserAgentRequestPayload::EvmGrantList(_)) => Ok(DomainRequest::ListGrants),
-            Some(UserAgentRequestPayload::EvmGrantCreate(EvmGrantCreateRequest {
-                client_id,
-                shared,
-                specific,
-            })) => {
-                let shared = parse_shared_settings(client_id, shared)?;
-                let specific = parse_specific_grant(specific)?;
-                Ok(DomainRequest::EvmGrantCreate {
-                    client_id,
-                    shared,
-                    specific,
-                })
-            }
-            Some(UserAgentRequestPayload::EvmGrantDelete(EvmGrantDeleteRequest { grant_id })) => {
-                Ok(DomainRequest::EvmGrantDelete { grant_id })
-            }
-            None => Err(Status::invalid_argument(
-                "Missing user-agent request payload",
-            )),
-        }
-    }
-
-    fn response_to_proto(response: DomainResponse) -> UserAgentResponse {
-        let payload = match response {
-            DomainResponse::AuthChallenge { nonce } => {
-                UserAgentResponsePayload::AuthChallenge(ProtoAuthChallenge {
-                    pubkey: Vec::new(),
-                    nonce,
-                })
-            }
-            DomainResponse::AuthOk => UserAgentResponsePayload::AuthOk(ProtoAuthOk {}),
-            DomainResponse::UnsealStartResponse { server_pubkey } => {
-                UserAgentResponsePayload::UnsealStartResponse(UnsealStartResponse {
-                    server_pubkey: server_pubkey.as_bytes().to_vec(),
-                })
-            }
-            DomainResponse::UnsealResult(result) => UserAgentResponsePayload::UnsealResult(
-                match result {
-                    Ok(()) => ProtoUnsealResult::Success,
-                    Err(UnsealError::InvalidKey) => ProtoUnsealResult::InvalidKey,
-                    Err(UnsealError::Unbootstrapped) => ProtoUnsealResult::Unbootstrapped,
-                }
-                .into(),
-            ),
-            DomainResponse::BootstrapResult(result) => UserAgentResponsePayload::BootstrapResult(
-                match result {
-                    Ok(()) => ProtoBootstrapResult::Success,
-                    Err(BootstrapError::AlreadyBootstrapped) => {
-                        ProtoBootstrapResult::AlreadyBootstrapped
-                    }
-                    Err(BootstrapError::InvalidKey) => ProtoBootstrapResult::InvalidKey,
-                }
-                .into(),
-            ),
-            DomainResponse::VaultState(state) => UserAgentResponsePayload::VaultState(
-                match state {
-                    VaultState::Unbootstrapped => ProtoVaultState::Unbootstrapped,
-                    VaultState::Sealed => ProtoVaultState::Sealed,
-                    VaultState::Unsealed => ProtoVaultState::Unsealed,
-                }
-                .into(),
-            ),
-            DomainResponse::ClientConnectionRequest { pubkey } => {
-                UserAgentResponsePayload::ClientConnectionRequest(ClientConnectionRequest {
-                    pubkey: pubkey.to_bytes().to_vec(),
-                })
-            }
-            DomainResponse::ClientConnectionCancel => {
-                UserAgentResponsePayload::ClientConnectionCancel(ClientConnectionCancel {})
-            }
-            DomainResponse::EvmWalletCreate(result) => {
-                UserAgentResponsePayload::EvmWalletCreate(WalletCreateResponse {
-                    result: Some(match result {
-                        Ok(()) => WalletCreateResult::Wallet(WalletEntry {
-                            address: Vec::new(),
-                        }),
-                        Err(_) => WalletCreateResult::Error(ProtoEvmError::Internal.into()),
-                    }),
-                })
-            }
-            DomainResponse::EvmWalletList(wallets) => {
-                UserAgentResponsePayload::EvmWalletList(WalletListResponse {
-                    result: Some(WalletListResult::Wallets(WalletList {
-                        wallets: wallets
-                            .into_iter()
-                            .map(|addr| WalletEntry {
-                                address: addr.as_slice().to_vec(),
-                            })
-                            .collect(),
-                    })),
-                })
-            }
-            DomainResponse::ListGrants(grants) => {
-                UserAgentResponsePayload::EvmGrantList(EvmGrantListResponse {
-                    result: Some(EvmGrantListResult::Grants(EvmGrantList {
-                        grants: grants.into_iter().map(grant_to_proto).collect(),
-                    })),
-                })
-            }
-            DomainResponse::EvmGrantCreate(result) => {
-                UserAgentResponsePayload::EvmGrantCreate(EvmGrantCreateResponse {
-                    result: Some(match result {
-                        Ok(grant_id) => EvmGrantCreateResult::GrantId(grant_id),
-                        Err(_) => EvmGrantCreateResult::Error(ProtoEvmError::Internal.into()),
-                    }),
-                })
-            }
-            DomainResponse::EvmGrantDelete(result) => {
-                UserAgentResponsePayload::EvmGrantDelete(EvmGrantDeleteResponse {
-                    result: Some(match result {
-                        Ok(()) => EvmGrantDeleteResult::Ok(()),
-                        Err(_) => EvmGrantDeleteResult::Error(ProtoEvmError::Internal.into()),
-                    }),
-                })
-            }
-        };
-
-        UserAgentResponse {
-            payload: Some(payload),
-        }
-    }
-
-    fn error_to_status(value: TransportResponseError) -> Status {
-        match value {
-            TransportResponseError::UnexpectedRequestPayload => {
-                Status::invalid_argument("Expected message with payload")
-            }
-            TransportResponseError::InvalidStateForUnsealEncryptedKey => {
-                Status::failed_precondition("Invalid state for unseal encrypted key")
-            }
-            TransportResponseError::InvalidClientPubkeyLength => {
-                Status::invalid_argument("client_pubkey must be 32 bytes")
-            }
-            TransportResponseError::StateTransitionFailed => {
-                Status::internal("State machine error")
-            }
-            TransportResponseError::KeyHolderActorUnreachable => {
-                Status::internal("Vault is not available")
-            }
-            TransportResponseError::Auth(ref err) => auth_error_status(err),
-            TransportResponseError::ConnectionRegistrationFailed => {
-                Status::internal("Failed registering connection")
-            }
-        }
-    }
-}
+pub struct OutOfBandAdapter(mpsc::Sender<OutOfBand>);
 
 #[async_trait]
-impl Bi<DomainRequest, Result<DomainResponse, TransportResponseError>> for GrpcTransport {
-    async fn send(
-        &mut self,
-        item: Result<DomainResponse, TransportResponseError>,
-    ) -> Result<(), TransportError> {
-        let outbound = match item {
-            Ok(message) => Ok(Self::response_to_proto(message)),
-            Err(err) => Err(Self::error_to_status(err)),
-        };
-
-        self.sender
-            .send(outbound)
-            .await
-            .map_err(|_| TransportError::ChannelClosed)
+impl Sender<OutOfBand> for OutOfBandAdapter {
+    async fn send(&mut self, item: OutOfBand) -> Result<(), TransportError> {
+        self.0.send(item).await.map_err(|e| {
+            warn!(error = ?e, "Failed to send out-of-band message");
+            TransportError::ChannelClosed
+        })
+    }
 }
 
-    async fn recv(&mut self) -> Option<DomainRequest> {
-        match self.receiver.next().await {
-            Some(Ok(item)) => match Self::request_to_domain(item) {
-                Ok(request) => Some(request),
+async fn dispatch_loop(
+    mut bi: GrpcBi<UserAgentRequest, UserAgentResponse>,
+    actor: ActorRef<UserAgentSession>,
+    mut receiver: mpsc::Receiver<OutOfBand>,
+    mut request_tracker: RequestTracker,
+) {
+    loop {
+        tokio::select! {
+            oob = receiver.recv() => {
+                let Some(oob) = oob else {
+                    warn!("Out-of-band message channel closed");
+                    return;
+                };
+
+                let payload = sdk_client::out_of_band_payload(oob);
+
+                if bi.send(Ok(UserAgentResponse { id: None, payload: Some(payload) })).await.is_err() {
+                    return;
+                }
+            }
+
+            message = bi.recv() => {
+                let Some(message) = message else { return; };
+
+                let conn = match message {
+                    Ok(conn) => conn,
+                    Err(err) => {
+                        warn!(error = ?err, "Failed to receive user agent request");
+                        return;
+                    }
+                };
+
+                let request_id = match request_tracker.request(conn.id) {
+                    Ok(id) => id,
+                    Err(err) => {
+                        let _ = bi.send(Err(err)).await;
+                        return;
+                    }
+                };
+
+                let Some(payload) = conn.payload else {
+                    let _ = bi.send(Err(Status::invalid_argument("Missing user-agent request payload"))).await;
+                    return;
+                };
+
+                match dispatch_inner(&actor, payload).await {
+                    Ok(Some(response)) => {
+                        if bi.send(Ok(UserAgentResponse {
+                            id: Some(request_id),
+                            payload: Some(response),
+                        })).await.is_err() {
+                            return;
+                        }
+                    }
+                    Ok(None) => {}
                     Err(status) => {
-                    let _ = self.sender.send(Err(status)).await;
-                    None
+                        error!(?status, "Failed to process user agent request");
+                        let _ = bi.send(Err(status)).await;
+                        return;
+                    }
                 }
-            },
-            Some(Err(error)) => {
-                tracing::error!(error = ?error, "grpc user-agent recv failed; closing stream");
-                None
             }
-            None => None,
         }
     }
 }
 
-fn grant_to_proto(grant: Grant<SpecificGrant>) -> proto::evm::GrantEntry {
-    GrantEntry {
-        id: grant.id,
-        specific: Some(match grant.settings {
-            SpecificGrant::EtherTransfer(settings) => ProtoSpecificGrant {
-                grant: Some(ProtoSpecificGrantType::EtherTransfer(
-                    ProtoEtherTransferSettings {
-                        targets: settings
-                            .target
-                            .into_iter()
-                            .map(|addr| addr.as_slice().to_vec())
-                            .collect(),
-                        limit: Some(proto::evm::VolumeRateLimit {
-                            max_volume: settings.limit.max_volume.to_be_bytes_vec(),
-                            window_secs: settings.limit.window.num_seconds(),
-                        }),
-                    },
-                )),
-            },
-            SpecificGrant::TokenTransfer(settings) => ProtoSpecificGrant {
-                grant: Some(ProtoSpecificGrantType::TokenTransfer(
-                    ProtoTokenTransferSettings {
-                        token_contract: settings.token_contract.as_slice().to_vec(),
-                        target: settings.target.map(|addr| addr.as_slice().to_vec()),
-                        volume_limits: settings
-                            .volume_limits
-                            .into_iter()
-                            .map(|vrl| proto::evm::VolumeRateLimit {
-                                max_volume: vrl.max_volume.to_be_bytes_vec(),
-                                window_secs: vrl.window.num_seconds(),
-                            })
-                            .collect(),
-                    },
-                )),
-            },
-        }),
-        client_id: grant.shared.client_id,
-        shared: Some(proto::evm::SharedSettings {
-            wallet_id: grant.shared.wallet_id,
-            chain_id: grant.shared.chain,
-            valid_from: grant.shared.valid_from.map(|dt| Timestamp {
-                seconds: dt.timestamp(),
-                nanos: 0,
-            }),
-            valid_until: grant.shared.valid_until.map(|dt| Timestamp {
-                seconds: dt.timestamp(),
-                nanos: 0,
-            }),
-            max_gas_fee_per_gas: grant
-                .shared
-                .max_gas_fee_per_gas
-                .map(|fee| fee.to_be_bytes_vec()),
-            max_priority_fee_per_gas: grant
-                .shared
-                .max_priority_fee_per_gas
-                .map(|fee| fee.to_be_bytes_vec()),
-            rate_limit: grant
-                .shared
-                .rate_limit
-                .map(|limit| proto::evm::TransactionRateLimit {
-                    count: limit.count,
-                    window_secs: limit.window.num_seconds(),
-                }),
-        }),
+async fn dispatch_inner(
+    actor: &ActorRef<UserAgentSession>,
+    payload: UserAgentRequestPayload,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    match payload {
+        UserAgentRequestPayload::Vault(req) => vault::dispatch(actor, req).await,
+        UserAgentRequestPayload::Evm(req) => evm::dispatch(actor, req).await,
+        UserAgentRequestPayload::SdkClient(req) => sdk_client::dispatch(actor, req).await,
+        UserAgentRequestPayload::Auth(..) => {
+            warn!("Unsupported post-auth user agent auth request");
+            Err(Status::invalid_argument("Unsupported user-agent request"))
+        }
     }
 }
 
-fn parse_volume_rate_limit(vrl: ProtoVolumeRateLimit) -> Result<VolumeRateLimit, Status> {
-    Ok(VolumeRateLimit {
-        max_volume: U256::from_be_slice(&vrl.max_volume),
-        window: chrono::Duration::seconds(vrl.window_secs),
-    })
-}
+pub async fn start(
+    mut conn: UserAgentConnection,
+    mut bi: GrpcBi<UserAgentRequest, UserAgentResponse>,
+) {
+    let mut request_tracker = RequestTracker::default();
 
-fn parse_shared_settings(
-    client_id: i32,
-    proto: Option<ProtoSharedSettings>,
-) -> Result<SharedGrantSettings, Status> {
-    let s = proto.ok_or_else(|| Status::invalid_argument("missing shared settings"))?;
-    let parse_u256 = |b: Vec<u8>| -> Result<U256, Status> {
-        if b.is_empty() {
-            Err(Status::invalid_argument("U256 bytes must not be empty"))
-        } else {
-            Ok(U256::from_be_slice(&b))
+    let pubkey = match auth::start(&mut conn, &mut bi, &mut request_tracker).await {
+        Ok(pubkey) => pubkey,
+        Err(e) => {
+            warn!(error = ?e, "Authentication failed");
+            return;
         }
     };
-    let parse_ts = |ts: prost_types::Timestamp| -> Result<DateTime<Utc>, Status> {
-        Utc.timestamp_opt(ts.seconds, ts.nanos as u32)
-            .single()
-            .ok_or_else(|| Status::invalid_argument("invalid timestamp"))
-    };
-    Ok(SharedGrantSettings {
-        wallet_id: s.wallet_id,
-        client_id,
-        chain: s.chain_id,
-        valid_from: s.valid_from.map(parse_ts).transpose()?,
-        valid_until: s.valid_until.map(parse_ts).transpose()?,
-        max_gas_fee_per_gas: s.max_gas_fee_per_gas.map(parse_u256).transpose()?,
-        max_priority_fee_per_gas: s.max_priority_fee_per_gas.map(parse_u256).transpose()?,
-        rate_limit: s.rate_limit.map(|rl| TransactionRateLimit {
-            count: rl.count,
-            window: chrono::Duration::seconds(rl.window_secs),
-        }),
-    })
-}
 
-fn parse_specific_grant(proto: Option<proto::evm::SpecificGrant>) -> Result<SpecificGrant, Status> {
-    use proto::evm::specific_grant::Grant as ProtoGrant;
-    let g = proto
-        .and_then(|sg| sg.grant)
-        .ok_or_else(|| Status::invalid_argument("missing specific grant"))?;
-    match g {
-        ProtoGrant::EtherTransfer(s) => {
-            let limit = parse_volume_rate_limit(
-                s.limit
-                    .ok_or_else(|| Status::invalid_argument("missing ether transfer limit"))?,
-            )?;
-            let target = s
-                .targets
-                .into_iter()
-                .map(|b| {
-                    if b.len() == 20 {
-                        Ok(Address::from_slice(&b))
-                    } else {
-                        Err(Status::invalid_argument(
-                            "ether transfer target must be 20 bytes",
-                        ))
-                    }
-                })
-                .collect::<Result<Vec<_>, _>>()?;
-            Ok(SpecificGrant::EtherTransfer(ether_transfer::Settings {
-                target,
-                limit,
-            }))
-        }
-        ProtoGrant::TokenTransfer(s) => {
-            if s.token_contract.len() != 20 {
-                return Err(Status::invalid_argument("token_contract must be 20 bytes"));
-            }
-            let target = s
-                .target
-                .map(|b| {
-                    if b.len() == 20 {
-                        Ok(Address::from_slice(&b))
-                    } else {
-                        Err(Status::invalid_argument(
-                            "token transfer target must be 20 bytes",
-                        ))
-                    }
-                })
-                .transpose()?;
-            let volume_limits = s
-                .volume_limits
-                .into_iter()
-                .map(parse_volume_rate_limit)
-                .collect::<Result<Vec<_>, _>>()?;
-            Ok(SpecificGrant::TokenTransfer(token_transfers::Settings {
-                token_contract: Address::from_slice(&s.token_contract),
-                target,
-                volume_limits,
-            }))
-        }
-    }
-}
+    let (oob_sender, oob_receiver) = mpsc::channel(16);
+    let oob_adapter = OutOfBandAdapter(oob_sender);
 
-fn parse_auth_pubkey(key_type: i32, pubkey: Vec<u8>) -> Result<AuthPublicKey, Status> {
-    match ProtoKeyType::try_from(key_type).unwrap_or(ProtoKeyType::Unspecified) {
-        ProtoKeyType::Unspecified | ProtoKeyType::Ed25519 => {
-            let bytes: [u8; 32] = pubkey
-                .as_slice()
-                .try_into()
-                .map_err(|_| Status::invalid_argument("invalid Ed25519 public key length"))?;
-            let key = ed25519_dalek::VerifyingKey::from_bytes(&bytes)
-                .map_err(|_| Status::invalid_argument("invalid Ed25519 public key encoding"))?;
-            Ok(AuthPublicKey::Ed25519(key))
-        }
-        ProtoKeyType::EcdsaSecp256k1 => {
-            let key = k256::ecdsa::VerifyingKey::from_sec1_bytes(&pubkey)
-                .map_err(|_| Status::invalid_argument("invalid secp256k1 public key encoding"))?;
-            Ok(AuthPublicKey::EcdsaSecp256k1(key))
-        }
-        ProtoKeyType::Rsa => {
-            use rsa::pkcs8::DecodePublicKey as _;
+    let actor = UserAgentSession::spawn(UserAgentSession::new(conn, Box::new(oob_adapter)));
+    let actor_for_cleanup = actor.clone();
 
-            let key = rsa::RsaPublicKey::from_public_key_der(&pubkey)
-                .map_err(|_| Status::invalid_argument("invalid RSA public key encoding"))?;
-            Ok(AuthPublicKey::Rsa(key))
-        }
-    }
-}
-
-fn auth_error_status(value: &user_agent::auth::Error) -> Status {
-    use user_agent::auth::Error;
-
-    match value {
-        Error::UnexpectedMessagePayload | Error::InvalidClientPubkeyLength => {
-            Status::invalid_argument(value.to_string())
-        }
-        Error::InvalidAuthPubkeyEncoding => {
-            Status::invalid_argument("Failed to convert pubkey to VerifyingKey")
-        }
-        Error::PublicKeyNotRegistered | Error::InvalidChallengeSolution => {
-            Status::unauthenticated(value.to_string())
-        }
-        Error::InvalidBootstrapToken => Status::invalid_argument("Invalid bootstrap token"),
-        Error::Transport => Status::internal("Transport error"),
-        Error::BootstrapperActorUnreachable => {
-            Status::internal("Bootstrap token consumption failed")
-        }
-        Error::DatabasePoolUnavailable => Status::internal("Database pool error"),
-        Error::DatabaseOperationFailed => Status::internal("Database error"),
-    }
+    info!(?pubkey, "User authenticated successfully");
+    dispatch_loop(bi, actor, oob_receiver, request_tracker).await;
+    actor_for_cleanup.kill();
 }

server/crates/arbiter-server/src/grpc/user_agent/auth.rs

@@ -0,0 +1,190 @@
+use arbiter_proto::{
+    proto::user_agent::{
+        UserAgentRequest, UserAgentResponse, auth::{
+            self as proto_auth, AuthChallenge as ProtoAuthChallenge,
+            AuthChallengeRequest as ProtoAuthChallengeRequest,
+            AuthChallengeSolution as ProtoAuthChallengeSolution, AuthResult as ProtoAuthResult,
+            KeyType as ProtoKeyType, request::Payload as AuthRequestPayload,
+            response::Payload as AuthResponsePayload,
+        }, user_agent_request::Payload as UserAgentRequestPayload,
+        user_agent_response::Payload as UserAgentResponsePayload,
+    },
+    transport::{Bi, Error as TransportError, Receiver, Sender, grpc::GrpcBi},
+};
+use async_trait::async_trait;
+use tonic::Status;
+use tracing::warn;
+
+use crate::{
+    actors::user_agent::{AuthPublicKey, UserAgentConnection, auth},
+    db::models::KeyType,
+    grpc::request_tracker::RequestTracker,
+};
+
+pub struct AuthTransportAdapter<'a> {
+    bi: &'a mut GrpcBi<UserAgentRequest, UserAgentResponse>,
+    request_tracker: &'a mut RequestTracker,
+}
+
+impl<'a> AuthTransportAdapter<'a> {
+    pub fn new(
+        bi: &'a mut GrpcBi<UserAgentRequest, UserAgentResponse>,
+        request_tracker: &'a mut RequestTracker,
+    ) -> Self {
+        Self {
+            bi,
+            request_tracker,
+        }
+    }
+
+    async fn send_user_agent_response(
+        &mut self,
+        payload: AuthResponsePayload,
+    ) -> Result<(), TransportError> {
+        self.bi
+            .send(Ok(UserAgentResponse {
+                id: Some(self.request_tracker.current_request_id()),
+                payload: Some(UserAgentResponsePayload::Auth(proto_auth::Response {
+                    payload: Some(payload),
+                })),
+            }))
+            .await
+    }
+}
+
+#[async_trait]
+impl Sender<Result<auth::Outbound, auth::Error>> for AuthTransportAdapter<'_> {
+    async fn send(
+        &mut self,
+        item: Result<auth::Outbound, auth::Error>,
+    ) -> Result<(), TransportError> {
+        use auth::{Error, Outbound};
+        let payload = match item {
+            Ok(Outbound::AuthChallenge { nonce }) => {
+                AuthResponsePayload::Challenge(ProtoAuthChallenge { nonce })
+            }
+            Ok(Outbound::AuthSuccess) => AuthResponsePayload::Result(ProtoAuthResult::Success.into()),
+            Err(Error::UnregisteredPublicKey) => {
+                AuthResponsePayload::Result(ProtoAuthResult::InvalidKey.into())
+            }
+            Err(Error::InvalidChallengeSolution) => {
+                AuthResponsePayload::Result(ProtoAuthResult::InvalidSignature.into())
+            }
+            Err(Error::InvalidBootstrapToken) => {
+                AuthResponsePayload::Result(ProtoAuthResult::TokenInvalid.into())
+            }
+            Err(Error::Internal { details }) => {
+                return self.bi.send(Err(Status::internal(details))).await;
+            }
+            Err(Error::Transport) => {
+                return self
+                    .bi
+                    .send(Err(Status::unavailable("transport error")))
+                    .await;
+            }
+        };
+
+        self.send_user_agent_response(payload).await
+    }
+}
+
+#[async_trait]
+impl Receiver<auth::Inbound> for AuthTransportAdapter<'_> {
+    async fn recv(&mut self) -> Option<auth::Inbound> {
+        let request = match self.bi.recv().await? {
+            Ok(request) => request,
+            Err(error) => {
+                warn!(error = ?error, "Failed to receive user agent auth request");
+                return None;
+            }
+        };
+
+        match self.request_tracker.request(request.id) {
+            Ok(request_id) => request_id,
+            Err(error) => {
+                let _ = self.bi.send(Err(error)).await;
+                return None;
+            }
+        };
+
+        let Some(payload) = request.payload else {
+            warn!(
+                event = "received request with empty payload",
+                "grpc.useragent.auth_adapter"
+            );
+            return None;
+        };
+
+        let UserAgentRequestPayload::Auth(auth_request) = payload else {
+            let _ = self
+                .bi
+                .send(Err(Status::invalid_argument(
+                    "Unsupported user-agent auth request",
+                )))
+                .await;
+            return None;
+        };
+
+        let Some(payload) = auth_request.payload else {
+            warn!(
+                event = "received auth request with empty payload",
+                "grpc.useragent.auth_adapter"
+            );
+            return None;
+        };
+
+        match payload {
+            AuthRequestPayload::ChallengeRequest(ProtoAuthChallengeRequest {
+                pubkey,
+                bootstrap_token,
+                key_type,
+            }) => {
+                let Ok(key_type) = ProtoKeyType::try_from(key_type) else {
+                    warn!(
+                        event = "received request with invalid key type",
+                        "grpc.useragent.auth_adapter"
+                    );
+                    return None;
+                };
+                let key_type = match key_type {
+                    ProtoKeyType::Ed25519 => KeyType::Ed25519,
+                    ProtoKeyType::EcdsaSecp256k1 => KeyType::EcdsaSecp256k1,
+                    ProtoKeyType::Rsa => KeyType::Rsa,
+                    ProtoKeyType::Unspecified => {
+                        warn!(
+                            event = "received request with unspecified key type",
+                            "grpc.useragent.auth_adapter"
+                        );
+                        return None;
+                    }
+                };
+                let Ok(pubkey) = AuthPublicKey::try_from((key_type, pubkey)) else {
+                    warn!(
+                        event = "received request with invalid public key",
+                        "grpc.useragent.auth_adapter"
+                    );
+                    return None;
+                };
+
+                Some(auth::Inbound::AuthChallengeRequest {
+                    pubkey,
+                    bootstrap_token,
+                })
+            }
+            AuthRequestPayload::ChallengeSolution(ProtoAuthChallengeSolution {
+                signature,
+            }) => Some(auth::Inbound::AuthChallengeSolution { signature }),
+        }
+    }
+}
+
+impl Bi<auth::Inbound, Result<auth::Outbound, auth::Error>> for AuthTransportAdapter<'_> {}
+
+pub async fn start(
+    conn: &mut UserAgentConnection,
+    bi: &mut GrpcBi<UserAgentRequest, UserAgentResponse>,
+    request_tracker: &mut RequestTracker,
+) -> Result<AuthPublicKey, auth::Error> {
+    let transport = AuthTransportAdapter::new(bi, request_tracker);
+    auth::authenticate(conn, transport).await
+}

server/crates/arbiter-server/src/grpc/user_agent/evm.rs

@@ -0,0 +1,230 @@
+use arbiter_proto::proto::{
+    evm::{
+        EvmError as ProtoEvmError, EvmGrantCreateRequest, EvmGrantCreateResponse,
+        EvmGrantDeleteRequest, EvmGrantDeleteResponse, EvmGrantList, EvmGrantListResponse,
+        EvmSignTransactionResponse, GrantEntry, WalletCreateResponse, WalletEntry, WalletList,
+        WalletListResponse,
+        evm_grant_create_response::Result as EvmGrantCreateResult,
+        evm_grant_delete_response::Result as EvmGrantDeleteResult,
+        evm_grant_list_response::Result as EvmGrantListResult,
+        evm_sign_transaction_response::Result as EvmSignTransactionResult,
+        wallet_create_response::Result as WalletCreateResult,
+        wallet_list_response::Result as WalletListResult,
+    },
+    user_agent::{
+        evm::{
+            self as proto_evm, SignTransactionRequest as ProtoSignTransactionRequest,
+            request::Payload as EvmRequestPayload, response::Payload as EvmResponsePayload,
+        },
+        user_agent_response::Payload as UserAgentResponsePayload,
+    },
+};
+use kameo::actor::ActorRef;
+use tonic::Status;
+use tracing::warn;
+
+use crate::{
+    actors::user_agent::{
+        UserAgentSession,
+        session::connection::{
+            HandleEvmWalletCreate, HandleEvmWalletList, HandleGrantCreate, HandleGrantDelete,
+            HandleGrantList, HandleSignTransaction,
+            SignTransactionError as SessionSignTransactionError,
+        },
+    },
+    grpc::{
+        Convert, TryConvert,
+        common::inbound::{RawEvmAddress, RawEvmTransaction},
+    },
+};
+
+fn wrap_evm_response(payload: EvmResponsePayload) -> UserAgentResponsePayload {
+    UserAgentResponsePayload::Evm(proto_evm::Response {
+        payload: Some(payload),
+    })
+}
+
+pub(super) async fn dispatch(
+    actor: &ActorRef<UserAgentSession>,
+    req: proto_evm::Request,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let Some(payload) = req.payload else {
+        return Err(Status::invalid_argument("Missing EVM request payload"));
+    };
+
+    match payload {
+        EvmRequestPayload::WalletCreate(_) => handle_wallet_create(actor).await,
+        EvmRequestPayload::WalletList(_) => handle_wallet_list(actor).await,
+        EvmRequestPayload::GrantCreate(req) => handle_grant_create(actor, req).await,
+        EvmRequestPayload::GrantDelete(req) => handle_grant_delete(actor, req).await,
+        EvmRequestPayload::GrantList(_) => handle_grant_list(actor).await,
+        EvmRequestPayload::SignTransaction(req) => handle_sign_transaction(actor, req).await,
+    }
+}
+
+async fn handle_wallet_create(
+    actor: &ActorRef<UserAgentSession>,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let result = match actor.ask(HandleEvmWalletCreate {}).await {
+        Ok((wallet_id, address)) => WalletCreateResult::Wallet(WalletEntry {
+            id: wallet_id,
+            address: address.to_vec(),
+        }),
+        Err(err) => {
+            warn!(error = ?err, "Failed to create EVM wallet");
+            WalletCreateResult::Error(ProtoEvmError::Internal.into())
+        }
+    };
+    Ok(Some(wrap_evm_response(EvmResponsePayload::WalletCreate(
+        WalletCreateResponse {
+            result: Some(result),
+        },
+    ))))
+}
+
+async fn handle_wallet_list(
+    actor: &ActorRef<UserAgentSession>,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let result = match actor.ask(HandleEvmWalletList {}).await {
+        Ok(wallets) => WalletListResult::Wallets(WalletList {
+            wallets: wallets
+                .into_iter()
+                .map(|(id, address)| WalletEntry {
+                    address: address.to_vec(),
+                    id,
+                })
+                .collect(),
+        }),
+        Err(err) => {
+            warn!(error = ?err, "Failed to list EVM wallets");
+            WalletListResult::Error(ProtoEvmError::Internal.into())
+        }
+    };
+    Ok(Some(wrap_evm_response(EvmResponsePayload::WalletList(
+        WalletListResponse {
+            result: Some(result),
+        },
+    ))))
+}
+
+async fn handle_grant_list(
+    actor: &ActorRef<UserAgentSession>,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let result = match actor.ask(HandleGrantList {}).await {
+        Ok(grants) => EvmGrantListResult::Grants(EvmGrantList {
+            grants: grants
+                .into_iter()
+                .map(|grant| GrantEntry {
+                    id: grant.id,
+                    wallet_access_id: grant.shared.wallet_access_id,
+                    shared: Some(grant.shared.convert()),
+                    specific: Some(grant.settings.convert()),
+                })
+                .collect(),
+        }),
+        Err(err) => {
+            warn!(error = ?err, "Failed to list EVM grants");
+            EvmGrantListResult::Error(ProtoEvmError::Internal.into())
+        }
+    };
+    Ok(Some(wrap_evm_response(EvmResponsePayload::GrantList(
+        EvmGrantListResponse {
+            result: Some(result),
+        },
+    ))))
+}
+
+async fn handle_grant_create(
+    actor: &ActorRef<UserAgentSession>,
+    req: EvmGrantCreateRequest,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let basic = req
+        .shared
+        .ok_or_else(|| Status::invalid_argument("Missing shared grant settings"))?
+        .try_convert()?;
+    let grant = req
+        .specific
+        .ok_or_else(|| Status::invalid_argument("Missing specific grant settings"))?
+        .try_convert()?;
+
+    let result = match actor.ask(HandleGrantCreate { basic, grant }).await {
+        Ok(grant_id) => EvmGrantCreateResult::GrantId(grant_id),
+        Err(err) => {
+            warn!(error = ?err, "Failed to create EVM grant");
+            EvmGrantCreateResult::Error(ProtoEvmError::Internal.into())
+        }
+    };
+    Ok(Some(wrap_evm_response(EvmResponsePayload::GrantCreate(
+        EvmGrantCreateResponse {
+            result: Some(result),
+        },
+    ))))
+}
+
+async fn handle_grant_delete(
+    actor: &ActorRef<UserAgentSession>,
+    req: EvmGrantDeleteRequest,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let result = match actor.ask(HandleGrantDelete { grant_id: req.grant_id }).await {
+        Ok(()) => EvmGrantDeleteResult::Ok(()),
+        Err(err) => {
+            warn!(error = ?err, "Failed to delete EVM grant");
+            EvmGrantDeleteResult::Error(ProtoEvmError::Internal.into())
+        }
+    };
+    Ok(Some(wrap_evm_response(EvmResponsePayload::GrantDelete(
+        EvmGrantDeleteResponse {
+            result: Some(result),
+        },
+    ))))
+}
+
+async fn handle_sign_transaction(
+    actor: &ActorRef<UserAgentSession>,
+    req: ProtoSignTransactionRequest,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let request = req
+        .request
+        .ok_or_else(|| Status::invalid_argument("Missing sign transaction request"))?;
+    let wallet_address = RawEvmAddress(request.wallet_address).try_convert()?;
+    let transaction = RawEvmTransaction(request.rlp_transaction).try_convert()?;
+
+    let response = match actor
+        .ask(HandleSignTransaction {
+            client_id: req.client_id,
+            wallet_address,
+            transaction,
+        })
+        .await
+    {
+        Ok(signature) => EvmSignTransactionResponse {
+            result: Some(EvmSignTransactionResult::Signature(
+                signature.as_bytes().to_vec(),
+            )),
+        },
+        Err(kameo::error::SendError::HandlerError(
+            SessionSignTransactionError::Vet(vet_error),
+        )) => EvmSignTransactionResponse {
+            result: Some(vet_error.convert()),
+        },
+        Err(kameo::error::SendError::HandlerError(
+            SessionSignTransactionError::Internal,
+        )) => EvmSignTransactionResponse {
+            result: Some(EvmSignTransactionResult::Error(
+                ProtoEvmError::Internal.into(),
+            )),
+        },
+        Err(err) => {
+            warn!(error = ?err, "Failed to sign EVM transaction");
+            EvmSignTransactionResponse {
+                result: Some(EvmSignTransactionResult::Error(
+                    ProtoEvmError::Internal.into(),
+                )),
+            }
+        }
+    };
+
+    Ok(Some(wrap_evm_response(EvmResponsePayload::SignTransaction(
+        response,
+    ))))
+}

server/crates/arbiter-server/src/grpc/user_agent/inbound.rs

@@ -0,0 +1,170 @@
+use alloy::primitives::{Address, U256};
+use arbiter_proto::proto::evm::{
+    EtherTransferSettings as ProtoEtherTransferSettings, SharedSettings as ProtoSharedSettings,
+    SpecificGrant as ProtoSpecificGrant, TokenTransferSettings as ProtoTokenTransferSettings,
+    TransactionRateLimit as ProtoTransactionRateLimit, VolumeRateLimit as ProtoVolumeRateLimit,
+    specific_grant::Grant as ProtoSpecificGrantType,
+};
+use arbiter_proto::proto::user_agent::sdk_client::{
+    WalletAccess, WalletAccessEntry as SdkClientWalletAccess,
+};
+use chrono::{DateTime, TimeZone, Utc};
+use prost_types::Timestamp as ProtoTimestamp;
+use tonic::Status;
+
+use crate::db::models::{CoreEvmWalletAccess, NewEvmWalletAccess};
+use crate::grpc::Convert;
+use crate::{
+    evm::policies::{
+        SharedGrantSettings, SpecificGrant, TransactionRateLimit, VolumeRateLimit, ether_transfer,
+        token_transfers,
+    },
+    grpc::TryConvert,
+};
+
+fn address_from_bytes(bytes: Vec<u8>) -> Result<Address, Status> {
+    if bytes.len() != 20 {
+        return Err(Status::invalid_argument("Invalid EVM address"));
+    }
+    Ok(Address::from_slice(&bytes))
+}
+
+fn u256_from_proto_bytes(bytes: &[u8]) -> Result<U256, Status> {
+    if bytes.len() > 32 {
+        return Err(Status::invalid_argument("Invalid U256 byte length"));
+    }
+    Ok(U256::from_be_slice(bytes))
+}
+
+impl TryConvert for ProtoTimestamp {
+    type Output = DateTime<Utc>;
+    type Error = Status;
+
+    fn try_convert(self) -> Result<DateTime<Utc>, Status> {
+        Utc.timestamp_opt(self.seconds, self.nanos as u32)
+            .single()
+            .ok_or_else(|| Status::invalid_argument("Invalid timestamp"))
+    }
+}
+
+impl TryConvert for ProtoTransactionRateLimit {
+    type Output = TransactionRateLimit;
+    type Error = Status;
+
+    fn try_convert(self) -> Result<TransactionRateLimit, Status> {
+        Ok(TransactionRateLimit {
+            count: self.count,
+            window: chrono::Duration::seconds(self.window_secs),
+        })
+    }
+}
+
+impl TryConvert for ProtoVolumeRateLimit {
+    type Output = VolumeRateLimit;
+    type Error = Status;
+
+    fn try_convert(self) -> Result<VolumeRateLimit, Status> {
+        Ok(VolumeRateLimit {
+            max_volume: u256_from_proto_bytes(&self.max_volume)?,
+            window: chrono::Duration::seconds(self.window_secs),
+        })
+    }
+}
+
+impl TryConvert for ProtoSharedSettings {
+    type Output = SharedGrantSettings;
+    type Error = Status;
+
+    fn try_convert(self) -> Result<SharedGrantSettings, Status> {
+        Ok(SharedGrantSettings {
+            wallet_access_id: self.wallet_access_id,
+            chain: self.chain_id,
+            valid_from: self
+                .valid_from
+                .map(ProtoTimestamp::try_convert)
+                .transpose()?,
+            valid_until: self
+                .valid_until
+                .map(ProtoTimestamp::try_convert)
+                .transpose()?,
+            max_gas_fee_per_gas: self
+                .max_gas_fee_per_gas
+                .as_deref()
+                .map(u256_from_proto_bytes)
+                .transpose()?,
+            max_priority_fee_per_gas: self
+                .max_priority_fee_per_gas
+                .as_deref()
+                .map(u256_from_proto_bytes)
+                .transpose()?,
+            rate_limit: self
+                .rate_limit
+                .map(ProtoTransactionRateLimit::try_convert)
+                .transpose()?,
+        })
+    }
+}
+
+impl TryConvert for ProtoSpecificGrant {
+    type Output = SpecificGrant;
+    type Error = Status;
+
+    fn try_convert(self) -> Result<SpecificGrant, Status> {
+        match self.grant {
+            Some(ProtoSpecificGrantType::EtherTransfer(ProtoEtherTransferSettings {
+                targets,
+                limit,
+            })) => Ok(SpecificGrant::EtherTransfer(ether_transfer::Settings {
+                target: targets
+                    .into_iter()
+                    .map(address_from_bytes)
+                    .collect::<Result<_, _>>()?,
+                limit: limit
+                    .ok_or_else(|| {
+                        Status::invalid_argument("Missing ether transfer volume rate limit")
+                    })?
+                    .try_convert()?,
+            })),
+            Some(ProtoSpecificGrantType::TokenTransfer(ProtoTokenTransferSettings {
+                token_contract,
+                target,
+                volume_limits,
+            })) => Ok(SpecificGrant::TokenTransfer(token_transfers::Settings {
+                token_contract: address_from_bytes(token_contract)?,
+                target: target.map(address_from_bytes).transpose()?,
+                volume_limits: volume_limits
+                    .into_iter()
+                    .map(ProtoVolumeRateLimit::try_convert)
+                    .collect::<Result<_, _>>()?,
+            })),
+            None => Err(Status::invalid_argument("Missing specific grant kind")),
+        }
+    }
+}
+
+impl Convert for WalletAccess {
+    type Output = NewEvmWalletAccess;
+
+    fn convert(self) -> Self::Output {
+        NewEvmWalletAccess {
+            wallet_id: self.wallet_id,
+            client_id: self.sdk_client_id,
+        }
+    }
+}
+
+impl TryConvert for SdkClientWalletAccess {
+    type Output = CoreEvmWalletAccess;
+    type Error = Status;
+
+    fn try_convert(self) -> Result<CoreEvmWalletAccess, Status> {
+        let Some(access) = self.access else {
+            return Err(Status::invalid_argument("Missing wallet access entry"));
+        };
+        Ok(CoreEvmWalletAccess {
+            wallet_id: access.wallet_id,
+            client_id: access.sdk_client_id,
+            id: self.id,
+        })
+    }
+}

server/crates/arbiter-server/src/grpc/user_agent/outbound.rs

@@ -0,0 +1,113 @@
+use arbiter_proto::proto::{
+    evm::{
+        EtherTransferSettings as ProtoEtherTransferSettings, SharedSettings as ProtoSharedSettings,
+        SpecificGrant as ProtoSpecificGrant, TokenTransferSettings as ProtoTokenTransferSettings,
+        TransactionRateLimit as ProtoTransactionRateLimit, VolumeRateLimit as ProtoVolumeRateLimit,
+        specific_grant::Grant as ProtoSpecificGrantType,
+    },
+    user_agent::sdk_client::{
+        WalletAccess, WalletAccessEntry as ProtoSdkClientWalletAccess,
+    },
+};
+use chrono::{DateTime, Utc};
+use prost_types::Timestamp as ProtoTimestamp;
+
+use crate::{
+    db::models::EvmWalletAccess,
+    evm::policies::{SharedGrantSettings, SpecificGrant, TransactionRateLimit, VolumeRateLimit},
+    grpc::Convert,
+};
+
+impl Convert for DateTime<Utc> {
+    type Output = ProtoTimestamp;
+
+    fn convert(self) -> ProtoTimestamp {
+        ProtoTimestamp {
+            seconds: self.timestamp(),
+            nanos: self.timestamp_subsec_nanos() as i32,
+        }
+    }
+}
+
+impl Convert for TransactionRateLimit {
+    type Output = ProtoTransactionRateLimit;
+
+    fn convert(self) -> ProtoTransactionRateLimit {
+        ProtoTransactionRateLimit {
+            count: self.count,
+            window_secs: self.window.num_seconds(),
+        }
+    }
+}
+
+impl Convert for VolumeRateLimit {
+    type Output = ProtoVolumeRateLimit;
+
+    fn convert(self) -> ProtoVolumeRateLimit {
+        ProtoVolumeRateLimit {
+            max_volume: self.max_volume.to_be_bytes::<32>().to_vec(),
+            window_secs: self.window.num_seconds(),
+        }
+    }
+}
+
+impl Convert for SharedGrantSettings {
+    type Output = ProtoSharedSettings;
+
+    fn convert(self) -> ProtoSharedSettings {
+        ProtoSharedSettings {
+            wallet_access_id: self.wallet_access_id,
+            chain_id: self.chain,
+            valid_from: self.valid_from.map(DateTime::convert),
+            valid_until: self.valid_until.map(DateTime::convert),
+            max_gas_fee_per_gas: self
+                .max_gas_fee_per_gas
+                .map(|value| value.to_be_bytes::<32>().to_vec()),
+            max_priority_fee_per_gas: self
+                .max_priority_fee_per_gas
+                .map(|value| value.to_be_bytes::<32>().to_vec()),
+            rate_limit: self.rate_limit.map(TransactionRateLimit::convert),
+        }
+    }
+}
+
+impl Convert for SpecificGrant {
+    type Output = ProtoSpecificGrant;
+
+    fn convert(self) -> ProtoSpecificGrant {
+        let grant = match self {
+            SpecificGrant::EtherTransfer(s) => {
+                ProtoSpecificGrantType::EtherTransfer(ProtoEtherTransferSettings {
+                    targets: s.target.into_iter().map(|a| a.to_vec()).collect(),
+                    limit: Some(s.limit.convert()),
+                })
+            }
+            SpecificGrant::TokenTransfer(s) => {
+                ProtoSpecificGrantType::TokenTransfer(ProtoTokenTransferSettings {
+                    token_contract: s.token_contract.to_vec(),
+                    target: s.target.map(|a| a.to_vec()),
+                    volume_limits: s
+                        .volume_limits
+                        .into_iter()
+                        .map(VolumeRateLimit::convert)
+                        .collect(),
+                })
+            }
+        };
+        ProtoSpecificGrant { grant: Some(grant) }
+    }
+}
+
+impl Convert for EvmWalletAccess {
+    type Output = ProtoSdkClientWalletAccess;
+
+    fn convert(self) -> Self::Output {
+        Self::Output {
+            id: self.id,
+            access: Some(WalletAccess {
+                wallet_id: self.wallet_id,
+                sdk_client_id: self.client_id,
+            }),
+        }
+    }
+}

server/crates/arbiter-server/src/grpc/user_agent/sdk_client.rs

@@ -0,0 +1,190 @@
+use arbiter_proto::proto::{
+    user_agent::{
+        sdk_client::{
+            self as proto_sdk_client, ConnectionCancel as ProtoSdkClientConnectionCancel,
+            ConnectionRequest as ProtoSdkClientConnectionRequest,
+            ConnectionResponse as ProtoSdkClientConnectionResponse, Entry as ProtoSdkClientEntry,
+            Error as ProtoSdkClientError, GrantWalletAccess as ProtoSdkClientGrantWalletAccess,
+            List as ProtoSdkClientList, ListResponse as ProtoSdkClientListResponse,
+            ListWalletAccessResponse, RevokeWalletAccess as ProtoSdkClientRevokeWalletAccess,
+            list_response::Result as ProtoSdkClientListResult,
+            request::Payload as SdkClientRequestPayload,
+            response::Payload as SdkClientResponsePayload,
+        },
+        user_agent_response::Payload as UserAgentResponsePayload,
+    },
+    shared::ClientInfo as ProtoClientMetadata,
+};
+use kameo::actor::ActorRef;
+use tonic::Status;
+use tracing::{info, warn};
+
+use crate::{
+    actors::user_agent::{
+        OutOfBand, UserAgentSession,
+        session::connection::{
+            HandleGrantEvmWalletAccess, HandleListWalletAccess, HandleNewClientApprove,
+            HandleRevokeEvmWalletAccess, HandleSdkClientList,
+        },
+    },
+    db::models::NewEvmWalletAccess,
+    grpc::Convert,
+};
+
+fn wrap_sdk_client_response(payload: SdkClientResponsePayload) -> UserAgentResponsePayload {
+    UserAgentResponsePayload::SdkClient(proto_sdk_client::Response {
+        payload: Some(payload),
+    })
+}
+
+pub(super) fn out_of_band_payload(oob: OutOfBand) -> UserAgentResponsePayload {
+    match oob {
+        OutOfBand::ClientConnectionRequest { profile } => wrap_sdk_client_response(
+            SdkClientResponsePayload::ConnectionRequest(ProtoSdkClientConnectionRequest {
+                pubkey: profile.pubkey.to_bytes().to_vec(),
+                info: Some(ProtoClientMetadata {
+                    name: profile.metadata.name,
+                    description: profile.metadata.description,
+                    version: profile.metadata.version,
+                }),
+            }),
+        ),
+        OutOfBand::ClientConnectionCancel { pubkey } => wrap_sdk_client_response(
+            SdkClientResponsePayload::ConnectionCancel(ProtoSdkClientConnectionCancel {
+                pubkey: pubkey.to_bytes().to_vec(),
+            }),
+        ),
+    }
+}
+
+pub(super) async fn dispatch(
+    actor: &ActorRef<UserAgentSession>,
+    req: proto_sdk_client::Request,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let Some(payload) = req.payload else {
+        return Err(Status::invalid_argument("Missing SDK client request payload"));
+    };
+
+    match payload {
+        SdkClientRequestPayload::ConnectionResponse(resp) => {
+            handle_connection_response(actor, resp).await
+        }
+        SdkClientRequestPayload::Revoke(_) => {
+            Err(Status::unimplemented("SdkClientRevoke is not yet implemented"))
+        }
+        SdkClientRequestPayload::List(_) => handle_list(actor).await,
+        SdkClientRequestPayload::GrantWalletAccess(req) => handle_grant_wallet_access(actor, req).await,
+        SdkClientRequestPayload::RevokeWalletAccess(req) => {
+            handle_revoke_wallet_access(actor, req).await
+        }
+        SdkClientRequestPayload::ListWalletAccess(_) => handle_list_wallet_access(actor).await,
+    }
+}
+
+async fn handle_connection_response(
+    actor: &ActorRef<UserAgentSession>,
+    resp: ProtoSdkClientConnectionResponse,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let pubkey_bytes = <[u8; 32]>::try_from(resp.pubkey)
+        .map_err(|_| Status::invalid_argument("Invalid Ed25519 public key length"))?;
+    let pubkey = ed25519_dalek::VerifyingKey::from_bytes(&pubkey_bytes)
+        .map_err(|_| Status::invalid_argument("Invalid Ed25519 public key"))?;
+
+    actor
+        .ask(HandleNewClientApprove {
+            approved: resp.approved,
+            pubkey,
+        })
+        .await
+        .map_err(|err| {
+            warn!(?err, "Failed to process client connection response");
+            Status::internal("Failed to process response")
+        })?;
+
+    Ok(None)
+}
+
+async fn handle_list(
+    actor: &ActorRef<UserAgentSession>,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let result = match actor.ask(HandleSdkClientList {}).await {
+        Ok(clients) => ProtoSdkClientListResult::Clients(ProtoSdkClientList {
+            clients: clients
+                .into_iter()
+                .map(|(client, metadata)| ProtoSdkClientEntry {
+                    id: client.id,
+                    pubkey: client.public_key,
+                    info: Some(ProtoClientMetadata {
+                        name: metadata.name,
+                        description: metadata.description,
+                        version: metadata.version,
+                    }),
+                    created_at: client.created_at.0.timestamp() as i32,
+                })
+                .collect(),
+        }),
+        Err(err) => {
+            warn!(error = ?err, "Failed to list SDK clients");
+            ProtoSdkClientListResult::Error(ProtoSdkClientError::Internal.into())
+        }
+    };
+    Ok(Some(wrap_sdk_client_response(SdkClientResponsePayload::List(
+        ProtoSdkClientListResponse {
+            result: Some(result),
+        },
+    ))))
+}
+
+async fn handle_grant_wallet_access(
+    actor: &ActorRef<UserAgentSession>,
+    req: ProtoSdkClientGrantWalletAccess,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let entries: Vec<NewEvmWalletAccess> = req.accesses.into_iter().map(|a| a.convert()).collect();
+    match actor.ask(HandleGrantEvmWalletAccess { entries }).await {
+        Ok(()) => {
+            info!("Successfully granted wallet access");
+            Ok(None)
+        }
+        Err(err) => {
+            warn!(error = ?err, "Failed to grant wallet access");
+            Err(Status::internal("Failed to grant wallet access"))
+        }
+    }
+}
+
+async fn handle_revoke_wallet_access(
+    actor: &ActorRef<UserAgentSession>,
+    req: ProtoSdkClientRevokeWalletAccess,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    match actor
+        .ask(HandleRevokeEvmWalletAccess {
+            entries: req.accesses,
+        })
+        .await
+    {
+        Ok(()) => {
+            info!("Successfully revoked wallet access");
+            Ok(None)
+        }
+        Err(err) => {
+            warn!(error = ?err, "Failed to revoke wallet access");
+            Err(Status::internal("Failed to revoke wallet access"))
+        }
+    }
+}
+
+async fn handle_list_wallet_access(
+    actor: &ActorRef<UserAgentSession>,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    match actor.ask(HandleListWalletAccess {}).await {
+        Ok(accesses) => Ok(Some(wrap_sdk_client_response(
+            SdkClientResponsePayload::ListWalletAccess(ListWalletAccessResponse {
+                accesses: accesses.into_iter().map(|a| a.convert()).collect(),
+            }),
+        ))),
+        Err(err) => {
+            warn!(error = ?err, "Failed to list wallet access");
+            Err(Status::internal("Failed to list wallet access"))
+        }
+    }
+}

server/crates/arbiter-server/src/grpc/user_agent/vault.rs

@@ -0,0 +1,181 @@
+use arbiter_proto::proto::user_agent::{
+    user_agent_response::Payload as UserAgentResponsePayload,
+    vault::{
+        self as proto_vault,
+        bootstrap::{
+            self as proto_bootstrap, BootstrapEncryptedKey as ProtoBootstrapEncryptedKey,
+            BootstrapResult as ProtoBootstrapResult,
+        },
+        request::Payload as VaultRequestPayload,
+        response::Payload as VaultResponsePayload,
+        unseal::{
+            self as proto_unseal, UnsealEncryptedKey as ProtoUnsealEncryptedKey,
+            UnsealResult as ProtoUnsealResult, UnsealStart,
+            request::Payload as UnsealRequestPayload,
+            response::Payload as UnsealResponsePayload,
+        },
+    },
+};
+use arbiter_proto::proto::shared::VaultState as ProtoVaultState;
+use kameo::{actor::ActorRef, error::SendError};
+use tonic::Status;
+use tracing::warn;
+
+use crate::{
+    actors::{
+        keyholder::KeyHolderState,
+        user_agent::{
+            UserAgentSession,
+            session::connection::{
+                BootstrapError, HandleBootstrapEncryptedKey, HandleQueryVaultState,
+                HandleUnsealEncryptedKey, HandleUnsealRequest, UnsealError,
+            },
+        },
+    },
+};
+
+fn wrap_vault_response(payload: VaultResponsePayload) -> UserAgentResponsePayload {
+    UserAgentResponsePayload::Vault(proto_vault::Response {
+        payload: Some(payload),
+    })
+}
+
+fn wrap_unseal_response(payload: UnsealResponsePayload) -> UserAgentResponsePayload {
+    wrap_vault_response(VaultResponsePayload::Unseal(proto_unseal::Response {
+        payload: Some(payload),
+    }))
+}
+
+fn wrap_bootstrap_response(result: ProtoBootstrapResult) -> UserAgentResponsePayload {
+    wrap_vault_response(VaultResponsePayload::Bootstrap(proto_bootstrap::Response {
+        result: result.into(),
+    }))
+}
+
+pub(super) async fn dispatch(
+    actor: &ActorRef<UserAgentSession>,
+    req: proto_vault::Request,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let Some(payload) = req.payload else {
+        return Err(Status::invalid_argument("Missing vault request payload"));
+    };
+
+    match payload {
+        VaultRequestPayload::QueryState(_) => handle_query_vault_state(actor).await,
+        VaultRequestPayload::Unseal(req) => dispatch_unseal_request(actor, req).await,
+        VaultRequestPayload::Bootstrap(req) => handle_bootstrap_request(actor, req).await,
+    }
+}
+
+async fn dispatch_unseal_request(
+    actor: &ActorRef<UserAgentSession>,
+    req: proto_unseal::Request,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let Some(payload) = req.payload else {
+        return Err(Status::invalid_argument("Missing unseal request payload"));
+    };
+
+    match payload {
+        UnsealRequestPayload::Start(req) => handle_unseal_start(actor, req).await,
+        UnsealRequestPayload::EncryptedKey(req) => handle_unseal_encrypted_key(actor, req).await,
+    }
+}
+
+async fn handle_unseal_start(
+    actor: &ActorRef<UserAgentSession>,
+    req: UnsealStart,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let client_pubkey = <[u8; 32]>::try_from(req.client_pubkey)
+        .map(x25519_dalek::PublicKey::from)
+        .map_err(|_| Status::invalid_argument("Invalid X25519 public key"))?;
+
+    let response = actor
+        .ask(HandleUnsealRequest { client_pubkey })
+        .await
+        .map_err(|err| {
+            warn!(error = ?err, "Failed to handle unseal start request");
+            Status::internal("Failed to start unseal flow")
+        })?;
+
+    Ok(Some(wrap_unseal_response(UnsealResponsePayload::Start(
+        proto_unseal::UnsealStartResponse {
+            server_pubkey: response.server_pubkey.as_bytes().to_vec(),
+        },
+    ))))
+}
+
+async fn handle_unseal_encrypted_key(
+    actor: &ActorRef<UserAgentSession>,
+    req: ProtoUnsealEncryptedKey,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let result = match actor
+        .ask(HandleUnsealEncryptedKey {
+            nonce: req.nonce,
+            ciphertext: req.ciphertext,
+            associated_data: req.associated_data,
+        })
+        .await
+    {
+        Ok(()) => ProtoUnsealResult::Success,
+        Err(SendError::HandlerError(UnsealError::InvalidKey)) => ProtoUnsealResult::InvalidKey,
+        Err(err) => {
+            warn!(error = ?err, "Failed to handle unseal request");
+            return Err(Status::internal("Failed to unseal vault"));
+        }
+    };
+    Ok(Some(wrap_unseal_response(UnsealResponsePayload::Result(
+        result.into(),
+    ))))
+}
+
+async fn handle_bootstrap_request(
+    actor: &ActorRef<UserAgentSession>,
+    req: proto_bootstrap::Request,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let encrypted_key = req
+        .encrypted_key
+        .ok_or_else(|| Status::invalid_argument("Missing bootstrap encrypted key"))?;
+    handle_bootstrap_encrypted_key(actor, encrypted_key).await
+}
+
+async fn handle_bootstrap_encrypted_key(
+    actor: &ActorRef<UserAgentSession>,
+    req: ProtoBootstrapEncryptedKey,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let result = match actor
+        .ask(HandleBootstrapEncryptedKey {
+            nonce: req.nonce,
+            ciphertext: req.ciphertext,
+            associated_data: req.associated_data,
+        })
+        .await
+    {
+        Ok(()) => ProtoBootstrapResult::Success,
+        Err(SendError::HandlerError(BootstrapError::InvalidKey)) => ProtoBootstrapResult::InvalidKey,
+        Err(SendError::HandlerError(BootstrapError::AlreadyBootstrapped)) => {
+            ProtoBootstrapResult::AlreadyBootstrapped
+        }
+        Err(err) => {
+            warn!(error = ?err, "Failed to handle bootstrap request");
+            return Err(Status::internal("Failed to bootstrap vault"));
+        }
+    };
+    Ok(Some(wrap_bootstrap_response(result)))
+}
+
+async fn handle_query_vault_state(
+    actor: &ActorRef<UserAgentSession>,
+) -> Result<Option<UserAgentResponsePayload>, Status> {
+    let state = match actor.ask(HandleQueryVaultState {}).await {
+        Ok(KeyHolderState::Unbootstrapped) => ProtoVaultState::Unbootstrapped,
+        Ok(KeyHolderState::Sealed) => ProtoVaultState::Sealed,
+        Ok(KeyHolderState::Unsealed) => ProtoVaultState::Unsealed,
+        Err(err) => {
+            warn!(error = ?err, "Failed to query vault state");
+            ProtoVaultState::Error
+        }
+    };
+    Ok(Some(wrap_vault_response(VaultResponsePayload::State(
+        state.into(),
+    ))))
+}

server/crates/arbiter-server/src/lib.rs

@@ -1,10 +1,4 @@
 #![forbid(unsafe_code)]
-#![deny(
-    clippy::unwrap_used,
-    clippy::expect_used,
-    clippy::panic
-)]
-
 use crate::context::ServerContext;
 
 pub mod actors;
@@ -13,8 +7,7 @@ pub mod db;
 pub mod evm;
 pub mod grpc;
 pub mod safe_cell;
-
-const DEFAULT_CHANNEL_SIZE: usize = 1000;
+pub mod utils;
 
 pub struct Server {
     context: ServerContext,
@@ -25,4 +18,3 @@ impl Server {
         Self { context }
     }
 }
-

server/crates/arbiter-server/src/utils.rs

@@ -0,0 +1,16 @@
+struct DeferClosure<F: FnOnce()> {
+    f: Option<F>,
+}
+
+impl<F: FnOnce()> Drop for DeferClosure<F> {
+    fn drop(&mut self) {
+        if let Some(f) = self.f.take() {
+            f();
+        }
+    }
+}
+
+// Run some code when a scope is exited, similar to Go's defer statement
+pub fn defer<F: FnOnce()>(f: F) -> impl Drop + Sized {
+    DeferClosure { f: Some(f) }
+}

server/crates/arbiter-server/tests/client/auth.rs

@@ -1,15 +1,52 @@
-use arbiter_proto::transport::Bi;
+use arbiter_proto::ClientMetadata;
+use arbiter_proto::transport::{Receiver, Sender};
 use arbiter_server::actors::GlobalActors;
 use arbiter_server::{
-    actors::client::{ClientConnection, Request, Response, connect_client},
-    db::{self, schema},
+    actors::client::{ClientConnection, auth, connect_client},
+    db,
 };
-use diesel::{ExpressionMethods as _, insert_into};
+use diesel::{ExpressionMethods as _, NullableExpressionMethods as _, QueryDsl as _, insert_into};
 use diesel_async::RunQueryDsl;
 use ed25519_dalek::Signer as _;
 
 use super::common::ChannelTransport;
 
+fn metadata(name: &str, description: Option<&str>, version: Option<&str>) -> ClientMetadata {
+    ClientMetadata {
+        name: name.to_owned(),
+        description: description.map(str::to_owned),
+        version: version.map(str::to_owned),
+    }
+}
+
+async fn insert_registered_client(
+    db: &db::DatabasePool,
+    pubkey: Vec<u8>,
+    metadata: &ClientMetadata,
+) {
+    use arbiter_server::db::schema::{client_metadata, program_client};
+
+    let mut conn = db.get().await.unwrap();
+    let metadata_id: i32 = insert_into(client_metadata::table)
+        .values((
+            client_metadata::name.eq(&metadata.name),
+            client_metadata::description.eq(&metadata.description),
+            client_metadata::version.eq(&metadata.version),
+        ))
+        .returning(client_metadata::id)
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    insert_into(program_client::table)
+        .values((
+            program_client::public_key.eq(pubkey),
+            program_client::metadata_id.eq(metadata_id),
+        ))
+        .execute(&mut conn)
+        .await
+        .unwrap();
+}
+
 #[tokio::test]
 #[test_log::test]
 pub async fn test_unregistered_pubkey_rejected() {
@@ -17,15 +54,18 @@ pub async fn test_unregistered_pubkey_rejected() {
 
     let (server_transport, mut test_transport) = ChannelTransport::new();
     let actors = GlobalActors::spawn(db.clone()).await.unwrap();
-    let props = ClientConnection::new(db.clone(), Box::new(server_transport), actors);
-    let task = tokio::spawn(connect_client(props));
+    let props = ClientConnection::new(db.clone(), actors);
+    let task = tokio::spawn(async move {
+        let mut server_transport = server_transport;
+        connect_client(props, &mut server_transport).await;
+    });
 
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
-    let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
 
     test_transport
-        .send(Request::AuthChallengeRequest {
-            pubkey: pubkey_bytes,
+        .send(auth::Inbound::AuthChallengeRequest {
+            pubkey: new_key.verifying_key(),
+            metadata: metadata("client", Some("desc"), Some("1.0.0")),
         })
         .await
         .unwrap();
@@ -42,25 +82,27 @@ pub async fn test_challenge_auth() {
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
     let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
 
-    {
-        let mut conn = db.get().await.unwrap();
-        insert_into(schema::program_client::table)
-            .values(schema::program_client::public_key.eq(pubkey_bytes.clone()))
-            .execute(&mut conn)
-            .await
-            .unwrap();
-    }
+    insert_registered_client(
+        &db,
+        pubkey_bytes.clone(),
+        &metadata("client", Some("desc"), Some("1.0.0")),
+    )
+    .await;
 
     let (server_transport, mut test_transport) = ChannelTransport::new();
     let actors = GlobalActors::spawn(db.clone()).await.unwrap();
 
-    let props = ClientConnection::new(db.clone(), Box::new(server_transport), actors);
-    let task = tokio::spawn(connect_client(props));
+    let props = ClientConnection::new(db.clone(), actors);
+    let task = tokio::spawn(async move {
+        let mut server_transport = server_transport;
+        connect_client(props, &mut server_transport).await;
+    });
 
     // Send challenge request
     test_transport
-        .send(Request::AuthChallengeRequest {
-            pubkey: pubkey_bytes,
+        .send(auth::Inbound::AuthChallengeRequest {
+            pubkey: new_key.verifying_key(),
+            metadata: metadata("client", Some("desc"), Some("1.0.0")),
         })
         .await
         .unwrap();
@@ -72,23 +114,211 @@ pub async fn test_challenge_auth() {
         .expect("should receive challenge");
     let challenge = match response {
         Ok(resp) => match resp {
-            Response::AuthChallenge { pubkey, nonce } => (pubkey, nonce),
+            auth::Outbound::AuthChallenge { pubkey, nonce } => (pubkey, nonce),
             other => panic!("Expected AuthChallenge, got {other:?}"),
         },
         Err(err) => panic!("Expected Ok response, got Err({err:?})"),
     };
 
     // Sign the challenge and send solution
-    let formatted_challenge = arbiter_proto::format_challenge(challenge.1, &challenge.0);
+    let formatted_challenge = arbiter_proto::format_challenge(challenge.1, challenge.0.as_bytes());
     let signature = new_key.sign(&formatted_challenge);
 
     test_transport
-        .send(Request::AuthChallengeSolution {
-            signature: signature.to_bytes().to_vec(),
-        })
+        .send(auth::Inbound::AuthChallengeSolution { signature })
         .await
         .unwrap();
 
+    let response = test_transport
+        .recv()
+        .await
+        .expect("should receive auth success");
+    match response {
+        Ok(auth::Outbound::AuthSuccess) => {}
+        Ok(other) => panic!("Expected AuthSuccess, got {other:?}"),
+        Err(err) => panic!("Expected Ok response, got Err({err:?})"),
+    }
+
     // Auth completes, session spawned
     task.await.unwrap();
 }
+
+#[tokio::test]
+#[test_log::test]
+pub async fn test_metadata_unchanged_does_not_append_history() {
+    let db = db::create_test_pool().await;
+    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
+    let props = ClientConnection::new(db.clone(), actors);
+
+    let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
+    let requested = metadata("client", Some("desc"), Some("1.0.0"));
+
+    {
+        use arbiter_server::db::schema::{client_metadata, program_client};
+        let mut conn = db.get().await.unwrap();
+        let metadata_id: i32 = insert_into(client_metadata::table)
+            .values((
+                client_metadata::name.eq(&requested.name),
+                client_metadata::description.eq(&requested.description),
+                client_metadata::version.eq(&requested.version),
+            ))
+            .returning(client_metadata::id)
+            .get_result(&mut conn)
+            .await
+            .unwrap();
+        insert_into(program_client::table)
+            .values((
+                program_client::public_key.eq(new_key.verifying_key().to_bytes().to_vec()),
+                program_client::metadata_id.eq(metadata_id),
+            ))
+            .execute(&mut conn)
+            .await
+            .unwrap();
+    }
+
+    let (server_transport, mut test_transport) = ChannelTransport::new();
+    let task = tokio::spawn(async move {
+        let mut server_transport = server_transport;
+        connect_client(props, &mut server_transport).await;
+    });
+
+    test_transport
+        .send(auth::Inbound::AuthChallengeRequest {
+            pubkey: new_key.verifying_key(),
+            metadata: requested,
+        })
+        .await
+        .unwrap();
+
+    let response = test_transport.recv().await.unwrap().unwrap();
+    let (pubkey, nonce) = match response {
+        auth::Outbound::AuthChallenge { pubkey, nonce } => (pubkey, nonce),
+        other => panic!("Expected AuthChallenge, got {other:?}"),
+    };
+    let signature = new_key.sign(&arbiter_proto::format_challenge(nonce, pubkey.as_bytes()));
+    test_transport
+        .send(auth::Inbound::AuthChallengeSolution { signature })
+        .await
+        .unwrap();
+    let _ = test_transport.recv().await.unwrap();
+    task.await.unwrap();
+
+    {
+        use arbiter_server::db::schema::{client_metadata, client_metadata_history};
+        let mut conn = db.get().await.unwrap();
+        let metadata_count: i64 = client_metadata::table
+            .count()
+            .get_result(&mut conn)
+            .await
+            .unwrap();
+        let history_count: i64 = client_metadata_history::table
+            .count()
+            .get_result(&mut conn)
+            .await
+            .unwrap();
+        assert_eq!(metadata_count, 1);
+        assert_eq!(history_count, 0);
+    }
+}
+
+#[tokio::test]
+#[test_log::test]
+pub async fn test_metadata_change_appends_history_and_repoints_binding() {
+    let db = db::create_test_pool().await;
+    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
+    let props = ClientConnection::new(db.clone(), actors);
+
+    let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
+
+    {
+        use arbiter_server::db::schema::{client_metadata, program_client};
+        let mut conn = db.get().await.unwrap();
+        let metadata_id: i32 = insert_into(client_metadata::table)
+            .values((
+                client_metadata::name.eq("client"),
+                client_metadata::description.eq(Some("old")),
+                client_metadata::version.eq(Some("1.0.0")),
+            ))
+            .returning(client_metadata::id)
+            .get_result(&mut conn)
+            .await
+            .unwrap();
+        insert_into(program_client::table)
+            .values((
+                program_client::public_key.eq(new_key.verifying_key().to_bytes().to_vec()),
+                program_client::metadata_id.eq(metadata_id),
+            ))
+            .execute(&mut conn)
+            .await
+            .unwrap();
+    }
+
+    let (server_transport, mut test_transport) = ChannelTransport::new();
+    let task = tokio::spawn(async move {
+        let mut server_transport = server_transport;
+        connect_client(props, &mut server_transport).await;
+    });
+
+    test_transport
+        .send(auth::Inbound::AuthChallengeRequest {
+            pubkey: new_key.verifying_key(),
+            metadata: metadata("client", Some("new"), Some("2.0.0")),
+        })
+        .await
+        .unwrap();
+
+    let response = test_transport.recv().await.unwrap().unwrap();
+    let (pubkey, nonce) = match response {
+        auth::Outbound::AuthChallenge { pubkey, nonce } => (pubkey, nonce),
+        other => panic!("Expected AuthChallenge, got {other:?}"),
+    };
+    let signature = new_key.sign(&arbiter_proto::format_challenge(nonce, pubkey.as_bytes()));
+    test_transport
+        .send(auth::Inbound::AuthChallengeSolution { signature })
+        .await
+        .unwrap();
+    let _ = test_transport.recv().await.unwrap();
+    task.await.unwrap();
+
+    {
+        use arbiter_server::db::schema::{
+            client_metadata, client_metadata_history, program_client,
+        };
+        let mut conn = db.get().await.unwrap();
+        let metadata_count: i64 = client_metadata::table
+            .count()
+            .get_result(&mut conn)
+            .await
+            .unwrap();
+        let history_count: i64 = client_metadata_history::table
+            .count()
+            .get_result(&mut conn)
+            .await
+            .unwrap();
+        let metadata_id = program_client::table
+            .select(program_client::metadata_id)
+            .first::<i32>(&mut conn)
+            .await
+            .unwrap();
+        let current = client_metadata::table
+            .find(metadata_id)
+            .select((
+                client_metadata::name,
+                client_metadata::description.nullable(),
+                client_metadata::version.nullable(),
+            ))
+            .first::<(String, Option<String>, Option<String>)>(&mut conn)
+            .await
+            .unwrap();
+        assert_eq!(metadata_count, 2);
+        assert_eq!(history_count, 1);
+        assert_eq!(
+            current,
+            (
+                "client".to_owned(),
+                Some("new".to_owned()),
+                Some("2.0.0".to_owned())
+            )
+        );
+    }
+}

server/crates/arbiter-server/tests/common/mod.rs

@@ -1,7 +1,8 @@
-use arbiter_proto::transport::{Bi, Error};
+use arbiter_proto::transport::{Bi, Error, Receiver, Sender};
 use arbiter_server::{
     actors::keyholder::KeyHolder,
-    db::{self, schema}, safe_cell::{SafeCell, SafeCellHandle as _},
+    db::{self, schema},
+    safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use async_trait::async_trait;
 use diesel::QueryDsl;
@@ -54,10 +55,10 @@ impl<T, Y> ChannelTransport<T, Y> {
 }
 
 #[async_trait]
-impl<T, Y> Bi<T, Y> for ChannelTransport<T, Y>
+impl<T, Y> Sender<Y> for ChannelTransport<T, Y>
 where
-    T: Send + 'static,
-    Y: Send + 'static,
+    T: Send + Sync + 'static,
+    Y: Send + Sync + 'static,
 {
     async fn send(&mut self, item: Y) -> Result<(), Error> {
         self.sender
@@ -65,8 +66,22 @@ where
             .await
             .map_err(|_| Error::ChannelClosed)
     }
+}
 
+#[async_trait]
+impl<T, Y> Receiver<T> for ChannelTransport<T, Y>
+where
+    T: Send + Sync + 'static,
+    Y: Send + Sync + 'static,
+{
     async fn recv(&mut self) -> Option<T> {
         self.receiver.recv().await
     }
 }
+
+impl<T, Y> Bi<T, Y> for ChannelTransport<T, Y>
+where
+    T: Send + Sync + 'static,
+    Y: Send + Sync + 'static,
+{
+}

server/crates/arbiter-server/tests/user_agent/auth.rs

@@ -1,9 +1,9 @@
-use arbiter_proto::transport::Bi;
+use arbiter_proto::transport::{Receiver, Sender};
 use arbiter_server::{
     actors::{
         GlobalActors,
         bootstrap::GetToken,
-        user_agent::{AuthPublicKey, Request, Response, UserAgentConnection, connect_user_agent},
+        user_agent::{AuthPublicKey, UserAgentConnection, auth},
     },
     db::{self, schema},
 };
@@ -21,19 +21,31 @@ pub async fn test_bootstrap_token_auth() {
     let token = actors.bootstrapper.ask(GetToken).await.unwrap().unwrap();
 
     let (server_transport, mut test_transport) = ChannelTransport::new();
-    let props = UserAgentConnection::new(db.clone(), actors, Box::new(server_transport));
-    let task = tokio::spawn(connect_user_agent(props));
+    let db_for_task = db.clone();
+    let task = tokio::spawn(async move {
+        let mut props = UserAgentConnection::new(db_for_task, actors);
+        auth::authenticate(&mut props, server_transport).await
+    });
 
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
     test_transport
-        .send(Request::AuthChallengeRequest {
+        .send(auth::Inbound::AuthChallengeRequest {
             pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
             bootstrap_token: Some(token),
         })
         .await
         .unwrap();
 
-    task.await.unwrap();
+    let response = test_transport
+        .recv()
+        .await
+        .expect("should receive auth result");
+    match response {
+        Ok(auth::Outbound::AuthSuccess) => {}
+        other => panic!("Expected AuthSuccess, got {other:?}"),
+    }
+
+    task.await.unwrap().unwrap();
 
     let mut conn = db.get().await.unwrap();
     let stored_pubkey: Vec<u8> = schema::useragent_client::table
@@ -51,20 +63,25 @@ pub async fn test_bootstrap_invalid_token_auth() {
     let actors = GlobalActors::spawn(db.clone()).await.unwrap();
 
     let (server_transport, mut test_transport) = ChannelTransport::new();
-    let props = UserAgentConnection::new(db.clone(), actors, Box::new(server_transport));
-    let task = tokio::spawn(connect_user_agent(props));
+    let db_for_task = db.clone();
+    let task = tokio::spawn(async move {
+        let mut props = UserAgentConnection::new(db_for_task, actors);
+        auth::authenticate(&mut props, server_transport).await
+    });
 
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
     test_transport
-        .send(Request::AuthChallengeRequest {
+        .send(auth::Inbound::AuthChallengeRequest {
             pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
             bootstrap_token: Some("invalid_token".to_string()),
         })
         .await
         .unwrap();
 
-    // Auth fails, connect_user_agent returns, transport drops
-    task.await.unwrap();
+    assert!(matches!(
+        task.await.unwrap(),
+        Err(auth::Error::InvalidBootstrapToken)
+    ));
 
     // Verify no key was registered
     let mut conn = db.get().await.unwrap();
@@ -99,12 +116,15 @@ pub async fn test_challenge_auth() {
     }
 
     let (server_transport, mut test_transport) = ChannelTransport::new();
-    let props = UserAgentConnection::new(db.clone(), actors, Box::new(server_transport));
-    let task = tokio::spawn(connect_user_agent(props));
+    let db_for_task = db.clone();
+    let task = tokio::spawn(async move {
+        let mut props = UserAgentConnection::new(db_for_task, actors);
+        auth::authenticate(&mut props, server_transport).await
+    });
 
     // Send challenge request
     test_transport
-        .send(Request::AuthChallengeRequest {
+        .send(auth::Inbound::AuthChallengeRequest {
             pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
             bootstrap_token: None,
         })
@@ -118,7 +138,7 @@ pub async fn test_challenge_auth() {
         .expect("should receive challenge");
     let challenge = match response {
         Ok(resp) => match resp {
-            Response::AuthChallenge { nonce } => nonce,
+            auth::Outbound::AuthChallenge { nonce } => nonce,
             other => panic!("Expected AuthChallenge, got {other:?}"),
         },
         Err(err) => panic!("Expected Ok response, got Err({err:?})"),
@@ -128,12 +148,86 @@ pub async fn test_challenge_auth() {
     let signature = new_key.sign(&formatted_challenge);
 
     test_transport
-        .send(Request::AuthChallengeSolution {
+        .send(auth::Inbound::AuthChallengeSolution {
             signature: signature.to_bytes().to_vec(),
         })
         .await
         .unwrap();
 
-    // Auth completes, session spawned
-    task.await.unwrap();
+    let response = test_transport
+        .recv()
+        .await
+        .expect("should receive auth result");
+    match response {
+        Ok(auth::Outbound::AuthSuccess) => {}
+        other => panic!("Expected AuthSuccess, got {other:?}"),
+    }
+
+    task.await.unwrap().unwrap();
+}
+
+#[tokio::test]
+#[test_log::test]
+pub async fn test_challenge_auth_rejects_invalid_signature() {
+    let db = db::create_test_pool().await;
+    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
+
+    let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
+    let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
+
+    // Pre-register key with key_type
+    {
+        let mut conn = db.get().await.unwrap();
+        insert_into(schema::useragent_client::table)
+            .values((
+                schema::useragent_client::public_key.eq(pubkey_bytes.clone()),
+                schema::useragent_client::key_type.eq(1i32),
+            ))
+            .execute(&mut conn)
+            .await
+            .unwrap();
+    }
+
+    let (server_transport, mut test_transport) = ChannelTransport::new();
+    let db_for_task = db.clone();
+    let task = tokio::spawn(async move {
+        let mut props = UserAgentConnection::new(db_for_task, actors);
+        auth::authenticate(&mut props, server_transport).await
+    });
+
+    test_transport
+        .send(auth::Inbound::AuthChallengeRequest {
+            pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
+            bootstrap_token: None,
+        })
+        .await
+        .unwrap();
+
+    let response = test_transport
+        .recv()
+        .await
+        .expect("should receive challenge");
+    let challenge = match response {
+        Ok(resp) => match resp {
+            auth::Outbound::AuthChallenge { nonce } => nonce,
+            other => panic!("Expected AuthChallenge, got {other:?}"),
+        },
+        Err(err) => panic!("Expected Ok response, got Err({err:?})"),
+    };
+
+    // Sign a different challenge value so signature format is valid but verification must fail.
+    let wrong_challenge = arbiter_proto::format_challenge(challenge + 1, &pubkey_bytes);
+    let signature = new_key.sign(&wrong_challenge);
+
+    test_transport
+        .send(auth::Inbound::AuthChallengeSolution {
+            signature: signature.to_bytes().to_vec(),
+        })
+        .await
+        .unwrap();
+
+    assert!(matches!(
+        task.await.unwrap(),
+        Err(auth::Error::InvalidChallengeSolution)
+    ));
 }

server/crates/arbiter-server/tests/user_agent/unseal.rs

@@ -2,15 +2,20 @@ use arbiter_server::{
     actors::{
         GlobalActors,
         keyholder::{Bootstrap, Seal},
-        user_agent::{Request, Response, UnsealError, session::UserAgentSession},
+        user_agent::{UserAgentSession, session::connection::{
+            HandleUnsealEncryptedKey, HandleUnsealRequest, UnsealError,
+        }},
     },
     db,
     safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
+use kameo::actor::Spawn as _;
 use x25519_dalek::{EphemeralSecret, PublicKey};
 
-async fn setup_sealed_user_agent(seal_key: &[u8]) -> (db::DatabasePool, UserAgentSession) {
+async fn setup_sealed_user_agent(
+    seal_key: &[u8],
+) -> (db::DatabasePool, kameo::actor::ActorRef<UserAgentSession>) {
     let db = db::create_test_pool().await;
     let actors = GlobalActors::spawn(db.clone()).await.unwrap();
 
@@ -23,26 +28,26 @@ async fn setup_sealed_user_agent(seal_key: &[u8]) -> (db::DatabasePool, UserAgen
         .unwrap();
     actors.key_holder.ask(Seal).await.unwrap();
 
-    let session = UserAgentSession::new_test(db.clone(), actors);
+    let session = UserAgentSession::spawn(UserAgentSession::new_test(db.clone(), actors));
 
     (db, session)
 }
 
-async fn client_dh_encrypt(user_agent: &mut UserAgentSession, key_to_send: &[u8]) -> Request {
+async fn client_dh_encrypt(
+    user_agent: &kameo::actor::ActorRef<UserAgentSession>,
+    key_to_send: &[u8],
+) -> HandleUnsealEncryptedKey {
     let client_secret = EphemeralSecret::random();
     let client_public = PublicKey::from(&client_secret);
 
     let response = user_agent
-        .process_transport_inbound(Request::UnsealStart {
+        .ask(HandleUnsealRequest {
             client_pubkey: client_public,
         })
         .await
         .unwrap();
 
-    let server_pubkey = match response {
-        Response::UnsealStartResponse { server_pubkey } => server_pubkey,
-        other => panic!("Expected UnsealStartResponse, got {other:?}"),
-    };
+    let server_pubkey = response.server_pubkey;
 
     let shared_secret = client_secret.diffie_hellman(&server_pubkey);
     let cipher = XChaCha20Poly1305::new(shared_secret.as_bytes().into());
@@ -53,7 +58,7 @@ async fn client_dh_encrypt(user_agent: &mut UserAgentSession, key_to_send: &[u8]
         .encrypt_in_place(&nonce, associated_data, &mut ciphertext)
         .unwrap();
 
-    Request::UnsealEncryptedKey {
+    HandleUnsealEncryptedKey {
         nonce: nonce.to_vec(),
         ciphertext,
         associated_data: associated_data.to_vec(),
@@ -64,63 +69,58 @@ async fn client_dh_encrypt(user_agent: &mut UserAgentSession, key_to_send: &[u8]
 #[test_log::test]
 pub async fn test_unseal_success() {
     let seal_key = b"test-seal-key";
-    let (_db, mut user_agent) = setup_sealed_user_agent(seal_key).await;
+    let (_db, user_agent) = setup_sealed_user_agent(seal_key).await;
 
-    let encrypted_key = client_dh_encrypt(&mut user_agent, seal_key).await;
+    let encrypted_key = client_dh_encrypt(&user_agent, seal_key).await;
 
-    let response = user_agent
-        .process_transport_inbound(encrypted_key)
-        .await
-        .unwrap();
-
-    assert!(matches!(response, Response::UnsealResult(Ok(()))));
+    let response = user_agent.ask(encrypted_key).await;
+    assert!(matches!(response, Ok(())));
 }
 
 #[tokio::test]
 #[test_log::test]
 pub async fn test_unseal_wrong_seal_key() {
-    let (_db, mut user_agent) = setup_sealed_user_agent(b"correct-key").await;
+    let (_db, user_agent) = setup_sealed_user_agent(b"correct-key").await;
 
-    let encrypted_key = client_dh_encrypt(&mut user_agent, b"wrong-key").await;
-
-    let response = user_agent
-        .process_transport_inbound(encrypted_key)
-        .await
-        .unwrap();
+    let encrypted_key = client_dh_encrypt(&user_agent, b"wrong-key").await;
 
+    let response = user_agent.ask(encrypted_key).await;
     assert!(matches!(
         response,
-        Response::UnsealResult(Err(UnsealError::InvalidKey))
+        Err(kameo::error::SendError::HandlerError(
+            UnsealError::InvalidKey
+        ))
     ));
 }
 
 #[tokio::test]
 #[test_log::test]
 pub async fn test_unseal_corrupted_ciphertext() {
-    let (_db, mut user_agent) = setup_sealed_user_agent(b"test-key").await;
+    let (_db, user_agent) = setup_sealed_user_agent(b"test-key").await;
 
     let client_secret = EphemeralSecret::random();
     let client_public = PublicKey::from(&client_secret);
 
     user_agent
-        .process_transport_inbound(Request::UnsealStart {
+        .ask(HandleUnsealRequest {
             client_pubkey: client_public,
         })
         .await
         .unwrap();
 
     let response = user_agent
-        .process_transport_inbound(Request::UnsealEncryptedKey {
+        .ask(HandleUnsealEncryptedKey {
             nonce: vec![0u8; 24],
             ciphertext: vec![0u8; 32],
             associated_data: vec![],
         })
-        .await
-        .unwrap();
+        .await;
 
     assert!(matches!(
         response,
-        Response::UnsealResult(Err(UnsealError::InvalidKey))
+        Err(kameo::error::SendError::HandlerError(
+            UnsealError::InvalidKey
+        ))
     ));
 }
 
@@ -128,30 +128,24 @@ pub async fn test_unseal_corrupted_ciphertext() {
 #[test_log::test]
 pub async fn test_unseal_retry_after_invalid_key() {
     let seal_key = b"real-seal-key";
-    let (_db, mut user_agent) = setup_sealed_user_agent(seal_key).await;
+    let (_db, user_agent) = setup_sealed_user_agent(seal_key).await;
 
     {
-        let encrypted_key = client_dh_encrypt(&mut user_agent, b"wrong-key").await;
-
-        let response = user_agent
-            .process_transport_inbound(encrypted_key)
-            .await
-            .unwrap();
+        let encrypted_key = client_dh_encrypt(&user_agent, b"wrong-key").await;
 
+        let response = user_agent.ask(encrypted_key).await;
         assert!(matches!(
             response,
-            Response::UnsealResult(Err(UnsealError::InvalidKey))
+            Err(kameo::error::SendError::HandlerError(
+                UnsealError::InvalidKey
+            ))
         ));
     }
 
     {
-        let encrypted_key = client_dh_encrypt(&mut user_agent, seal_key).await;
+        let encrypted_key = client_dh_encrypt(&user_agent, seal_key).await;
 
-        let response = user_agent
-            .process_transport_inbound(encrypted_key)
-            .await
-            .unwrap();
-
-        assert!(matches!(response, Response::UnsealResult(Ok(()))));
+        let response = user_agent.ask(encrypted_key).await;
+        assert!(matches!(response, Ok(())));
     }
 }

useragent/lib/features/callouts/active_callout.dart

@@ -0,0 +1,16 @@
+import 'package:arbiter/features/callouts/callout_event.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'active_callout.freezed.dart';
+
+@freezed
+abstract class ActiveCallout with _$ActiveCallout {
+  const factory ActiveCallout({
+    required String id,
+    required String title,
+    required String description,
+    String? iconUrl,
+    required DateTime addedAt,
+    required CalloutData data,
+  }) = _ActiveCallout;
+}

useragent/lib/features/callouts/active_callout.freezed.dart

@@ -0,0 +1,304 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// coverage:ignore-file
+// ignore_for_file: type=lint
+// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target, unnecessary_question_mark
+
+part of 'active_callout.dart';
+
+// **************************************************************************
+// FreezedGenerator
+// **************************************************************************
+
+// dart format off
+T _$identity<T>(T value) => value;
+/// @nodoc
+mixin _$ActiveCallout {
+
+ String get id; String get title; String get description; String? get iconUrl; DateTime get addedAt; CalloutData get data;
+/// Create a copy of ActiveCallout
+/// with the given fields replaced by the non-null parameter values.
+@JsonKey(includeFromJson: false, includeToJson: false)
+@pragma('vm:prefer-inline')
+$ActiveCalloutCopyWith<ActiveCallout> get copyWith => _$ActiveCalloutCopyWithImpl<ActiveCallout>(this as ActiveCallout, _$identity);
+
+
+
+@override
+bool operator ==(Object other) {
+  return identical(this, other) || (other.runtimeType == runtimeType&&other is ActiveCallout&&(identical(other.id, id) || other.id == id)&&(identical(other.title, title) || other.title == title)&&(identical(other.description, description) || other.description == description)&&(identical(other.iconUrl, iconUrl) || other.iconUrl == iconUrl)&&(identical(other.addedAt, addedAt) || other.addedAt == addedAt)&&(identical(other.data, data) || other.data == data));
+}
+
+
+@override
+int get hashCode => Object.hash(runtimeType,id,title,description,iconUrl,addedAt,data);
+
+@override
+String toString() {
+  return 'ActiveCallout(id: $id, title: $title, description: $description, iconUrl: $iconUrl, addedAt: $addedAt, data: $data)';
+}
+
+
+}
+
+/// @nodoc
+abstract mixin class $ActiveCalloutCopyWith<$Res>  {
+  factory $ActiveCalloutCopyWith(ActiveCallout value, $Res Function(ActiveCallout) _then) = _$ActiveCalloutCopyWithImpl;
+@useResult
+$Res call({
+ String id, String title, String description, String? iconUrl, DateTime addedAt, CalloutData data
+});
+
+
+$CalloutDataCopyWith<$Res> get data;
+
+}
+/// @nodoc
+class _$ActiveCalloutCopyWithImpl<$Res>
+    implements $ActiveCalloutCopyWith<$Res> {
+  _$ActiveCalloutCopyWithImpl(this._self, this._then);
+
+  final ActiveCallout _self;
+  final $Res Function(ActiveCallout) _then;
+
+/// Create a copy of ActiveCallout
+/// with the given fields replaced by the non-null parameter values.
+@pragma('vm:prefer-inline') @override $Res call({Object? id = null,Object? title = null,Object? description = null,Object? iconUrl = freezed,Object? addedAt = null,Object? data = null,}) {
+  return _then(_self.copyWith(
+id: null == id ? _self.id : id // ignore: cast_nullable_to_non_nullable
+as String,title: null == title ? _self.title : title // ignore: cast_nullable_to_non_nullable
+as String,description: null == description ? _self.description : description // ignore: cast_nullable_to_non_nullable
+as String,iconUrl: freezed == iconUrl ? _self.iconUrl : iconUrl // ignore: cast_nullable_to_non_nullable
+as String?,addedAt: null == addedAt ? _self.addedAt : addedAt // ignore: cast_nullable_to_non_nullable
+as DateTime,data: null == data ? _self.data : data // ignore: cast_nullable_to_non_nullable
+as CalloutData,
+  ));
+}
+/// Create a copy of ActiveCallout
+/// with the given fields replaced by the non-null parameter values.
+@override
+@pragma('vm:prefer-inline')
+$CalloutDataCopyWith<$Res> get data {
+  
+  return $CalloutDataCopyWith<$Res>(_self.data, (value) {
+    return _then(_self.copyWith(data: value));
+  });
+}
+}
+
+
+/// Adds pattern-matching-related methods to [ActiveCallout].
+extension ActiveCalloutPatterns on ActiveCallout {
+/// A variant of `map` that fallback to returning `orElse`.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case _:
+///     return orElse();
+/// }
+/// ```
+
+@optionalTypeArgs TResult maybeMap<TResult extends Object?>(TResult Function( _ActiveCallout value)?  $default,{required TResult orElse(),}){
+final _that = this;
+switch (_that) {
+case _ActiveCallout() when $default != null:
+return $default(_that);case _:
+  return orElse();
+
+}
+}
+/// A `switch`-like method, using callbacks.
+///
+/// Callbacks receives the raw object, upcasted.
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case final Subclass2 value:
+///     return ...;
+/// }
+/// ```
+
+@optionalTypeArgs TResult map<TResult extends Object?>(TResult Function( _ActiveCallout value)  $default,){
+final _that = this;
+switch (_that) {
+case _ActiveCallout():
+return $default(_that);case _:
+  throw StateError('Unexpected subclass');
+
+}
+}
+/// A variant of `map` that fallback to returning `null`.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case _:
+///     return null;
+/// }
+/// ```
+
+@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>(TResult? Function( _ActiveCallout value)?  $default,){
+final _that = this;
+switch (_that) {
+case _ActiveCallout() when $default != null:
+return $default(_that);case _:
+  return null;
+
+}
+}
+/// A variant of `when` that fallback to an `orElse` callback.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case _:
+///     return orElse();
+/// }
+/// ```
+
+@optionalTypeArgs TResult maybeWhen<TResult extends Object?>(TResult Function( String id,  String title,  String description,  String? iconUrl,  DateTime addedAt,  CalloutData data)?  $default,{required TResult orElse(),}) {final _that = this;
+switch (_that) {
+case _ActiveCallout() when $default != null:
+return $default(_that.id,_that.title,_that.description,_that.iconUrl,_that.addedAt,_that.data);case _:
+  return orElse();
+
+}
+}
+/// A `switch`-like method, using callbacks.
+///
+/// As opposed to `map`, this offers destructuring.
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case Subclass2(:final field2):
+///     return ...;
+/// }
+/// ```
+
+@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function( String id,  String title,  String description,  String? iconUrl,  DateTime addedAt,  CalloutData data)  $default,) {final _that = this;
+switch (_that) {
+case _ActiveCallout():
+return $default(_that.id,_that.title,_that.description,_that.iconUrl,_that.addedAt,_that.data);case _:
+  throw StateError('Unexpected subclass');
+
+}
+}
+/// A variant of `when` that fallback to returning `null`
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case _:
+///     return null;
+/// }
+/// ```
+
+@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( String id,  String title,  String description,  String? iconUrl,  DateTime addedAt,  CalloutData data)?  $default,) {final _that = this;
+switch (_that) {
+case _ActiveCallout() when $default != null:
+return $default(_that.id,_that.title,_that.description,_that.iconUrl,_that.addedAt,_that.data);case _:
+  return null;
+
+}
+}
+
+}
+
+/// @nodoc
+
+
+class _ActiveCallout implements ActiveCallout {
+  const _ActiveCallout({required this.id, required this.title, required this.description, this.iconUrl, required this.addedAt, required this.data});
+  
+
+@override final  String id;
+@override final  String title;
+@override final  String description;
+@override final  String? iconUrl;
+@override final  DateTime addedAt;
+@override final  CalloutData data;
+
+/// Create a copy of ActiveCallout
+/// with the given fields replaced by the non-null parameter values.
+@override @JsonKey(includeFromJson: false, includeToJson: false)
+@pragma('vm:prefer-inline')
+_$ActiveCalloutCopyWith<_ActiveCallout> get copyWith => __$ActiveCalloutCopyWithImpl<_ActiveCallout>(this, _$identity);
+
+
+
+@override
+bool operator ==(Object other) {
+  return identical(this, other) || (other.runtimeType == runtimeType&&other is _ActiveCallout&&(identical(other.id, id) || other.id == id)&&(identical(other.title, title) || other.title == title)&&(identical(other.description, description) || other.description == description)&&(identical(other.iconUrl, iconUrl) || other.iconUrl == iconUrl)&&(identical(other.addedAt, addedAt) || other.addedAt == addedAt)&&(identical(other.data, data) || other.data == data));
+}
+
+
+@override
+int get hashCode => Object.hash(runtimeType,id,title,description,iconUrl,addedAt,data);
+
+@override
+String toString() {
+  return 'ActiveCallout(id: $id, title: $title, description: $description, iconUrl: $iconUrl, addedAt: $addedAt, data: $data)';
+}
+
+
+}
+
+/// @nodoc
+abstract mixin class _$ActiveCalloutCopyWith<$Res> implements $ActiveCalloutCopyWith<$Res> {
+  factory _$ActiveCalloutCopyWith(_ActiveCallout value, $Res Function(_ActiveCallout) _then) = __$ActiveCalloutCopyWithImpl;
+@override @useResult
+$Res call({
+ String id, String title, String description, String? iconUrl, DateTime addedAt, CalloutData data
+});
+
+
+@override $CalloutDataCopyWith<$Res> get data;
+
+}
+/// @nodoc
+class __$ActiveCalloutCopyWithImpl<$Res>
+    implements _$ActiveCalloutCopyWith<$Res> {
+  __$ActiveCalloutCopyWithImpl(this._self, this._then);
+
+  final _ActiveCallout _self;
+  final $Res Function(_ActiveCallout) _then;
+
+/// Create a copy of ActiveCallout
+/// with the given fields replaced by the non-null parameter values.
+@override @pragma('vm:prefer-inline') $Res call({Object? id = null,Object? title = null,Object? description = null,Object? iconUrl = freezed,Object? addedAt = null,Object? data = null,}) {
+  return _then(_ActiveCallout(
+id: null == id ? _self.id : id // ignore: cast_nullable_to_non_nullable
+as String,title: null == title ? _self.title : title // ignore: cast_nullable_to_non_nullable
+as String,description: null == description ? _self.description : description // ignore: cast_nullable_to_non_nullable
+as String,iconUrl: freezed == iconUrl ? _self.iconUrl : iconUrl // ignore: cast_nullable_to_non_nullable
+as String?,addedAt: null == addedAt ? _self.addedAt : addedAt // ignore: cast_nullable_to_non_nullable
+as DateTime,data: null == data ? _self.data : data // ignore: cast_nullable_to_non_nullable
+as CalloutData,
+  ));
+}
+
+/// Create a copy of ActiveCallout
+/// with the given fields replaced by the non-null parameter values.
+@override
+@pragma('vm:prefer-inline')
+$CalloutDataCopyWith<$Res> get data {
+  
+  return $CalloutDataCopyWith<$Res>(_self.data, (value) {
+    return _then(_self.copyWith(data: value));
+  });
+}
+}
+
+// dart format on

useragent/lib/features/callouts/callout_event.dart

@@ -0,0 +1,24 @@
+import 'package:arbiter/proto/shared/client.pb.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'callout_event.freezed.dart';
+
+@freezed
+sealed class CalloutData with _$CalloutData {
+  const factory CalloutData.connectApproval({
+    required String pubkey,
+    required ClientInfo clientInfo,
+  }) = ConnectApprovalData;
+}
+
+@freezed
+sealed class CalloutEvent with _$CalloutEvent {
+  const factory CalloutEvent.added({
+    required String id,
+    required CalloutData data,
+  }) = CalloutEventAdded;
+
+  const factory CalloutEvent.cancelled({
+    required String id,
+  }) = CalloutEventCancelled;
+}

useragent/lib/features/callouts/callout_event.freezed.dart

@@ -0,0 +1,602 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// coverage:ignore-file
+// ignore_for_file: type=lint
+// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target, unnecessary_question_mark
+
+part of 'callout_event.dart';
+
+// **************************************************************************
+// FreezedGenerator
+// **************************************************************************
+
+// dart format off
+T _$identity<T>(T value) => value;
+/// @nodoc
+mixin _$CalloutData {
+
+ String get pubkey; ClientInfo get clientInfo;
+/// Create a copy of CalloutData
+/// with the given fields replaced by the non-null parameter values.
+@JsonKey(includeFromJson: false, includeToJson: false)
+@pragma('vm:prefer-inline')
+$CalloutDataCopyWith<CalloutData> get copyWith => _$CalloutDataCopyWithImpl<CalloutData>(this as CalloutData, _$identity);
+
+
+
+@override
+bool operator ==(Object other) {
+  return identical(this, other) || (other.runtimeType == runtimeType&&other is CalloutData&&(identical(other.pubkey, pubkey) || other.pubkey == pubkey)&&(identical(other.clientInfo, clientInfo) || other.clientInfo == clientInfo));
+}
+
+
+@override
+int get hashCode => Object.hash(runtimeType,pubkey,clientInfo);
+
+@override
+String toString() {
+  return 'CalloutData(pubkey: $pubkey, clientInfo: $clientInfo)';
+}
+
+
+}
+
+/// @nodoc
+abstract mixin class $CalloutDataCopyWith<$Res>  {
+  factory $CalloutDataCopyWith(CalloutData value, $Res Function(CalloutData) _then) = _$CalloutDataCopyWithImpl;
+@useResult
+$Res call({
+ String pubkey, ClientInfo clientInfo
+});
+
+
+
+
+}
+/// @nodoc
+class _$CalloutDataCopyWithImpl<$Res>
+    implements $CalloutDataCopyWith<$Res> {
+  _$CalloutDataCopyWithImpl(this._self, this._then);
+
+  final CalloutData _self;
+  final $Res Function(CalloutData) _then;
+
+/// Create a copy of CalloutData
+/// with the given fields replaced by the non-null parameter values.
+@pragma('vm:prefer-inline') @override $Res call({Object? pubkey = null,Object? clientInfo = null,}) {
+  return _then(_self.copyWith(
+pubkey: null == pubkey ? _self.pubkey : pubkey // ignore: cast_nullable_to_non_nullable
+as String,clientInfo: null == clientInfo ? _self.clientInfo : clientInfo // ignore: cast_nullable_to_non_nullable
+as ClientInfo,
+  ));
+}
+
+}
+
+
+/// Adds pattern-matching-related methods to [CalloutData].
+extension CalloutDataPatterns on CalloutData {
+/// A variant of `map` that fallback to returning `orElse`.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case _:
+///     return orElse();
+/// }
+/// ```
+
+@optionalTypeArgs TResult maybeMap<TResult extends Object?>({TResult Function( ConnectApprovalData value)?  connectApproval,required TResult orElse(),}){
+final _that = this;
+switch (_that) {
+case ConnectApprovalData() when connectApproval != null:
+return connectApproval(_that);case _:
+  return orElse();
+
+}
+}
+/// A `switch`-like method, using callbacks.
+///
+/// Callbacks receives the raw object, upcasted.
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case final Subclass2 value:
+///     return ...;
+/// }
+/// ```
+
+@optionalTypeArgs TResult map<TResult extends Object?>({required TResult Function( ConnectApprovalData value)  connectApproval,}){
+final _that = this;
+switch (_that) {
+case ConnectApprovalData():
+return connectApproval(_that);}
+}
+/// A variant of `map` that fallback to returning `null`.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case _:
+///     return null;
+/// }
+/// ```
+
+@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( ConnectApprovalData value)?  connectApproval,}){
+final _that = this;
+switch (_that) {
+case ConnectApprovalData() when connectApproval != null:
+return connectApproval(_that);case _:
+  return null;
+
+}
+}
+/// A variant of `when` that fallback to an `orElse` callback.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case _:
+///     return orElse();
+/// }
+/// ```
+
+@optionalTypeArgs TResult maybeWhen<TResult extends Object?>({TResult Function( String pubkey,  ClientInfo clientInfo)?  connectApproval,required TResult orElse(),}) {final _that = this;
+switch (_that) {
+case ConnectApprovalData() when connectApproval != null:
+return connectApproval(_that.pubkey,_that.clientInfo);case _:
+  return orElse();
+
+}
+}
+/// A `switch`-like method, using callbacks.
+///
+/// As opposed to `map`, this offers destructuring.
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case Subclass2(:final field2):
+///     return ...;
+/// }
+/// ```
+
+@optionalTypeArgs TResult when<TResult extends Object?>({required TResult Function( String pubkey,  ClientInfo clientInfo)  connectApproval,}) {final _that = this;
+switch (_that) {
+case ConnectApprovalData():
+return connectApproval(_that.pubkey,_that.clientInfo);}
+}
+/// A variant of `when` that fallback to returning `null`
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case _:
+///     return null;
+/// }
+/// ```
+
+@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>({TResult? Function( String pubkey,  ClientInfo clientInfo)?  connectApproval,}) {final _that = this;
+switch (_that) {
+case ConnectApprovalData() when connectApproval != null:
+return connectApproval(_that.pubkey,_that.clientInfo);case _:
+  return null;
+
+}
+}
+
+}
+
+/// @nodoc
+
+
+class ConnectApprovalData implements CalloutData {
+  const ConnectApprovalData({required this.pubkey, required this.clientInfo});
+  
+
+@override final  String pubkey;
+@override final  ClientInfo clientInfo;
+
+/// Create a copy of CalloutData
+/// with the given fields replaced by the non-null parameter values.
+@override @JsonKey(includeFromJson: false, includeToJson: false)
+@pragma('vm:prefer-inline')
+$ConnectApprovalDataCopyWith<ConnectApprovalData> get copyWith => _$ConnectApprovalDataCopyWithImpl<ConnectApprovalData>(this, _$identity);
+
+
+
+@override
+bool operator ==(Object other) {
+  return identical(this, other) || (other.runtimeType == runtimeType&&other is ConnectApprovalData&&(identical(other.pubkey, pubkey) || other.pubkey == pubkey)&&(identical(other.clientInfo, clientInfo) || other.clientInfo == clientInfo));
+}
+
+
+@override
+int get hashCode => Object.hash(runtimeType,pubkey,clientInfo);
+
+@override
+String toString() {
+  return 'CalloutData.connectApproval(pubkey: $pubkey, clientInfo: $clientInfo)';
+}
+
+
+}
+
+/// @nodoc
+abstract mixin class $ConnectApprovalDataCopyWith<$Res> implements $CalloutDataCopyWith<$Res> {
+  factory $ConnectApprovalDataCopyWith(ConnectApprovalData value, $Res Function(ConnectApprovalData) _then) = _$ConnectApprovalDataCopyWithImpl;
+@override @useResult
+$Res call({
+ String pubkey, ClientInfo clientInfo
+});
+
+
+
+
+}
+/// @nodoc
+class _$ConnectApprovalDataCopyWithImpl<$Res>
+    implements $ConnectApprovalDataCopyWith<$Res> {
+  _$ConnectApprovalDataCopyWithImpl(this._self, this._then);
+
+  final ConnectApprovalData _self;
+  final $Res Function(ConnectApprovalData) _then;
+
+/// Create a copy of CalloutData
+/// with the given fields replaced by the non-null parameter values.
+@override @pragma('vm:prefer-inline') $Res call({Object? pubkey = null,Object? clientInfo = null,}) {
+  return _then(ConnectApprovalData(
+pubkey: null == pubkey ? _self.pubkey : pubkey // ignore: cast_nullable_to_non_nullable
+as String,clientInfo: null == clientInfo ? _self.clientInfo : clientInfo // ignore: cast_nullable_to_non_nullable
+as ClientInfo,
+  ));
+}
+
+
+}
+
+/// @nodoc
+mixin _$CalloutEvent {
+
+ String get id;
+/// Create a copy of CalloutEvent
+/// with the given fields replaced by the non-null parameter values.
+@JsonKey(includeFromJson: false, includeToJson: false)
+@pragma('vm:prefer-inline')
+$CalloutEventCopyWith<CalloutEvent> get copyWith => _$CalloutEventCopyWithImpl<CalloutEvent>(this as CalloutEvent, _$identity);
+
+
+
+@override
+bool operator ==(Object other) {
+  return identical(this, other) || (other.runtimeType == runtimeType&&other is CalloutEvent&&(identical(other.id, id) || other.id == id));
+}
+
+
+@override
+int get hashCode => Object.hash(runtimeType,id);
+
+@override
+String toString() {
+  return 'CalloutEvent(id: $id)';
+}
+
+
+}
+
+/// @nodoc
+abstract mixin class $CalloutEventCopyWith<$Res>  {
+  factory $CalloutEventCopyWith(CalloutEvent value, $Res Function(CalloutEvent) _then) = _$CalloutEventCopyWithImpl;
+@useResult
+$Res call({
+ String id
+});
+
+
+
+
+}
+/// @nodoc
+class _$CalloutEventCopyWithImpl<$Res>
+    implements $CalloutEventCopyWith<$Res> {
+  _$CalloutEventCopyWithImpl(this._self, this._then);
+
+  final CalloutEvent _self;
+  final $Res Function(CalloutEvent) _then;
+
+/// Create a copy of CalloutEvent
+/// with the given fields replaced by the non-null parameter values.
+@pragma('vm:prefer-inline') @override $Res call({Object? id = null,}) {
+  return _then(_self.copyWith(
+id: null == id ? _self.id : id // ignore: cast_nullable_to_non_nullable
+as String,
+  ));
+}
+
+}
+
+
+/// Adds pattern-matching-related methods to [CalloutEvent].
+extension CalloutEventPatterns on CalloutEvent {
+/// A variant of `map` that fallback to returning `orElse`.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case _:
+///     return orElse();
+/// }
+/// ```
+
+@optionalTypeArgs TResult maybeMap<TResult extends Object?>({TResult Function( CalloutEventAdded value)?  added,TResult Function( CalloutEventCancelled value)?  cancelled,required TResult orElse(),}){
+final _that = this;
+switch (_that) {
+case CalloutEventAdded() when added != null:
+return added(_that);case CalloutEventCancelled() when cancelled != null:
+return cancelled(_that);case _:
+  return orElse();
+
+}
+}
+/// A `switch`-like method, using callbacks.
+///
+/// Callbacks receives the raw object, upcasted.
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case final Subclass2 value:
+///     return ...;
+/// }
+/// ```
+
+@optionalTypeArgs TResult map<TResult extends Object?>({required TResult Function( CalloutEventAdded value)  added,required TResult Function( CalloutEventCancelled value)  cancelled,}){
+final _that = this;
+switch (_that) {
+case CalloutEventAdded():
+return added(_that);case CalloutEventCancelled():
+return cancelled(_that);}
+}
+/// A variant of `map` that fallback to returning `null`.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case final Subclass value:
+///     return ...;
+///   case _:
+///     return null;
+/// }
+/// ```
+
+@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( CalloutEventAdded value)?  added,TResult? Function( CalloutEventCancelled value)?  cancelled,}){
+final _that = this;
+switch (_that) {
+case CalloutEventAdded() when added != null:
+return added(_that);case CalloutEventCancelled() when cancelled != null:
+return cancelled(_that);case _:
+  return null;
+
+}
+}
+/// A variant of `when` that fallback to an `orElse` callback.
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case _:
+///     return orElse();
+/// }
+/// ```
+
+@optionalTypeArgs TResult maybeWhen<TResult extends Object?>({TResult Function( String id,  CalloutData data)?  added,TResult Function( String id)?  cancelled,required TResult orElse(),}) {final _that = this;
+switch (_that) {
+case CalloutEventAdded() when added != null:
+return added(_that.id,_that.data);case CalloutEventCancelled() when cancelled != null:
+return cancelled(_that.id);case _:
+  return orElse();
+
+}
+}
+/// A `switch`-like method, using callbacks.
+///
+/// As opposed to `map`, this offers destructuring.
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case Subclass2(:final field2):
+///     return ...;
+/// }
+/// ```
+
+@optionalTypeArgs TResult when<TResult extends Object?>({required TResult Function( String id,  CalloutData data)  added,required TResult Function( String id)  cancelled,}) {final _that = this;
+switch (_that) {
+case CalloutEventAdded():
+return added(_that.id,_that.data);case CalloutEventCancelled():
+return cancelled(_that.id);}
+}
+/// A variant of `when` that fallback to returning `null`
+///
+/// It is equivalent to doing:
+/// ```dart
+/// switch (sealedClass) {
+///   case Subclass(:final field):
+///     return ...;
+///   case _:
+///     return null;
+/// }
+/// ```
+
+@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>({TResult? Function( String id,  CalloutData data)?  added,TResult? Function( String id)?  cancelled,}) {final _that = this;
+switch (_that) {
+case CalloutEventAdded() when added != null:
+return added(_that.id,_that.data);case CalloutEventCancelled() when cancelled != null:
+return cancelled(_that.id);case _:
+  return null;
+
+}
+}
+
+}
+
+/// @nodoc
+
+
+class CalloutEventAdded implements CalloutEvent {
+  const CalloutEventAdded({required this.id, required this.data});
+  
+
+@override final  String id;
+ final  CalloutData data;
+
+/// Create a copy of CalloutEvent
+/// with the given fields replaced by the non-null parameter values.
+@override @JsonKey(includeFromJson: false, includeToJson: false)
+@pragma('vm:prefer-inline')
+$CalloutEventAddedCopyWith<CalloutEventAdded> get copyWith => _$CalloutEventAddedCopyWithImpl<CalloutEventAdded>(this, _$identity);
+
+
+
+@override
+bool operator ==(Object other) {
+  return identical(this, other) || (other.runtimeType == runtimeType&&other is CalloutEventAdded&&(identical(other.id, id) || other.id == id)&&(identical(other.data, data) || other.data == data));
+}
+
+
+@override
+int get hashCode => Object.hash(runtimeType,id,data);
+
+@override
+String toString() {
+  return 'CalloutEvent.added(id: $id, data: $data)';
+}
+
+
+}
+
+/// @nodoc
+abstract mixin class $CalloutEventAddedCopyWith<$Res> implements $CalloutEventCopyWith<$Res> {
+  factory $CalloutEventAddedCopyWith(CalloutEventAdded value, $Res Function(CalloutEventAdded) _then) = _$CalloutEventAddedCopyWithImpl;
+@override @useResult
+$Res call({
+ String id, CalloutData data
+});
+
+
+$CalloutDataCopyWith<$Res> get data;
+
+}
+/// @nodoc
+class _$CalloutEventAddedCopyWithImpl<$Res>
+    implements $CalloutEventAddedCopyWith<$Res> {
+  _$CalloutEventAddedCopyWithImpl(this._self, this._then);
+
+  final CalloutEventAdded _self;
+  final $Res Function(CalloutEventAdded) _then;
+
+/// Create a copy of CalloutEvent
+/// with the given fields replaced by the non-null parameter values.
+@override @pragma('vm:prefer-inline') $Res call({Object? id = null,Object? data = null,}) {
+  return _then(CalloutEventAdded(
+id: null == id ? _self.id : id // ignore: cast_nullable_to_non_nullable
+as String,data: null == data ? _self.data : data // ignore: cast_nullable_to_non_nullable
+as CalloutData,
+  ));
+}
+
+/// Create a copy of CalloutEvent
+/// with the given fields replaced by the non-null parameter values.
+@override
+@pragma('vm:prefer-inline')
+$CalloutDataCopyWith<$Res> get data {
+  
+  return $CalloutDataCopyWith<$Res>(_self.data, (value) {
+    return _then(_self.copyWith(data: value));
+  });
+}
+}
+
+/// @nodoc
+
+
+class CalloutEventCancelled implements CalloutEvent {
+  const CalloutEventCancelled({required this.id});
+  
+
+@override final  String id;
+
+/// Create a copy of CalloutEvent
+/// with the given fields replaced by the non-null parameter values.
+@override @JsonKey(includeFromJson: false, includeToJson: false)
+@pragma('vm:prefer-inline')
+$CalloutEventCancelledCopyWith<CalloutEventCancelled> get copyWith => _$CalloutEventCancelledCopyWithImpl<CalloutEventCancelled>(this, _$identity);
+
+
+
+@override
+bool operator ==(Object other) {
+  return identical(this, other) || (other.runtimeType == runtimeType&&other is CalloutEventCancelled&&(identical(other.id, id) || other.id == id));
+}
+
+
+@override
+int get hashCode => Object.hash(runtimeType,id);
+
+@override
+String toString() {
+  return 'CalloutEvent.cancelled(id: $id)';
+}
+
+
+}
+
+/// @nodoc
+abstract mixin class $CalloutEventCancelledCopyWith<$Res> implements $CalloutEventCopyWith<$Res> {
+  factory $CalloutEventCancelledCopyWith(CalloutEventCancelled value, $Res Function(CalloutEventCancelled) _then) = _$CalloutEventCancelledCopyWithImpl;
+@override @useResult
+$Res call({
+ String id
+});
+
+
+
+
+}
+/// @nodoc
+class _$CalloutEventCancelledCopyWithImpl<$Res>
+    implements $CalloutEventCancelledCopyWith<$Res> {
+  _$CalloutEventCancelledCopyWithImpl(this._self, this._then);
+
+  final CalloutEventCancelled _self;
+  final $Res Function(CalloutEventCancelled) _then;
+
+/// Create a copy of CalloutEvent
+/// with the given fields replaced by the non-null parameter values.
+@override @pragma('vm:prefer-inline') $Res call({Object? id = null,}) {
+  return _then(CalloutEventCancelled(
+id: null == id ? _self.id : id // ignore: cast_nullable_to_non_nullable
+as String,
+  ));
+}
+
+
+}
+
+// dart format on

useragent/lib/features/callouts/callout_manager.dart

@@ -0,0 +1,57 @@
+import 'package:arbiter/features/callouts/active_callout.dart';
+import 'package:arbiter/features/callouts/callout_event.dart';
+import 'package:arbiter/features/callouts/types/sdk_connect_approve.dart'
+    as connect_approve;
+import 'package:arbiter/proto/shared/client.pb.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'callout_manager.g.dart';
+
+@Riverpod(keepAlive: true)
+class CalloutManager extends _$CalloutManager {
+  @override
+  Map<String, ActiveCallout> build() {
+    ref.listen(connect_approve.connectApproveEventsProvider, (_, next) {
+      next.whenData(_processEvent);
+    });
+    return {};
+  }
+
+  void _processEvent(CalloutEvent event) {
+    switch (event) {
+      case CalloutEventAdded(:final id, :final data):
+        state = {...state, id: _toActiveCallout(id, data)};
+      case CalloutEventCancelled(:final id):
+        state = {...state}..remove(id);
+    }
+  }
+
+  Future<void> sendDecision(String id, bool approved) async {
+    final callout = state[id];
+    if (callout == null) return;
+    switch (callout.data) {
+      case ConnectApprovalData(:final pubkey):
+        await connect_approve.sendDecision(ref, pubkey, approved);
+    }
+    dismiss(id);
+  }
+
+  void dismiss(String id) {
+    state = {...state}..remove(id);
+  }
+}
+
+ActiveCallout _toActiveCallout(String id, CalloutData data) => switch (data) {
+  ConnectApprovalData(:final clientInfo) => ActiveCallout(
+    id: id,
+    title: 'Connection Request',
+    description: _clientDisplayName(clientInfo) != null
+        ? '${_clientDisplayName(clientInfo)} is requesting a connection.'
+        : 'An SDK client is requesting a connection.',
+    addedAt: DateTime.now(),
+    data: data,
+  ),
+};
+
+String? _clientDisplayName(ClientInfo info) =>
+    info.hasName() && info.name.isNotEmpty ? info.name : null;

useragent/lib/features/callouts/callout_manager.g.dart

@@ -0,0 +1,67 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'callout_manager.dart';
+
+// **************************************************************************
+// RiverpodGenerator
+// **************************************************************************
+
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint, type=warning
+
+@ProviderFor(CalloutManager)
+final calloutManagerProvider = CalloutManagerProvider._();
+
+final class CalloutManagerProvider
+    extends $NotifierProvider<CalloutManager, Map<String, ActiveCallout>> {
+  CalloutManagerProvider._()
+    : super(
+        from: null,
+        argument: null,
+        retry: null,
+        name: r'calloutManagerProvider',
+        isAutoDispose: false,
+        dependencies: null,
+        $allTransitiveDependencies: null,
+      );
+
+  @override
+  String debugGetCreateSourceHash() => _$calloutManagerHash();
+
+  @$internal
+  @override
+  CalloutManager create() => CalloutManager();
+
+  /// {@macro riverpod.override_with_value}
+  Override overrideWithValue(Map<String, ActiveCallout> value) {
+    return $ProviderOverride(
+      origin: this,
+      providerOverride: $SyncValueProvider<Map<String, ActiveCallout>>(value),
+    );
+  }
+}
+
+String _$calloutManagerHash() => r'ff8c9a03a6bbbca822242eb497c503b18240a289';
+
+abstract class _$CalloutManager extends $Notifier<Map<String, ActiveCallout>> {
+  Map<String, ActiveCallout> build();
+  @$mustCallSuper
+  @override
+  void runBuild() {
+    final ref =
+        this.ref
+            as $Ref<Map<String, ActiveCallout>, Map<String, ActiveCallout>>;
+    final element =
+        ref.element
+            as $ClassProviderElement<
+              AnyNotifier<
+                Map<String, ActiveCallout>,
+                Map<String, ActiveCallout>
+              >,
+              Map<String, ActiveCallout>,
+              Object?,
+              Object?
+            >;
+    element.handleCreate(ref, build);
+  }
+}

useragent/lib/features/callouts/show_callout.dart

@@ -0,0 +1,99 @@
+import 'package:arbiter/features/callouts/callout_event.dart';
+import 'package:arbiter/features/callouts/callout_manager.dart';
+import 'package:arbiter/screens/callouts/sdk_connect.dart';
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+Future<void> showCallout(BuildContext context, WidgetRef ref, String id) async {
+  final data = ref.read(calloutManagerProvider)[id]?.data;
+  if (data == null) return;
+
+  await showGeneralDialog(
+    context: context,
+    barrierDismissible: false,
+    barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
+    barrierColor: Colors.transparent,
+    transitionDuration: const Duration(milliseconds: 320),
+    pageBuilder: (_, animation, _) => _CalloutOverlay(
+      id: id,
+      data: data,
+      animation: animation,
+    ),
+  );
+}
+
+class _CalloutOverlay extends ConsumerWidget {
+  const _CalloutOverlay({
+    required this.id,
+    required this.data,
+    required this.animation,
+  });
+
+  final String id;
+  final CalloutData data;
+  final Animation<double> animation;
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    ref.listen(
+      calloutManagerProvider.select((map) => map.containsKey(id)),
+      (wasPresent, isPresent) {
+        if (wasPresent == true && !isPresent && context.mounted) {
+          Navigator.of(context).pop();
+        }
+      },
+    );
+
+    final content = switch (data) {
+      ConnectApprovalData(:final pubkey, :final clientInfo) => SdkConnectCallout(
+        pubkey: pubkey,
+        clientInfo: clientInfo,
+        onAccept: () => ref.read(calloutManagerProvider.notifier).sendDecision(id, true),
+        onDecline: () => ref.read(calloutManagerProvider.notifier).sendDecision(id, false),
+      ),
+    };
+
+    final barrierAnim = CurvedAnimation(
+      parent: animation,
+      curve: const Interval(0, 0.3125, curve: Curves.easeOut),
+    );
+    final popupAnim = CurvedAnimation(
+      parent: animation,
+      curve: const Interval(0.3125, 1, curve: Curves.easeOutCubic),
+    );
+
+    return Material(
+      type: MaterialType.transparency,
+      child: Stack(
+        children: [
+          Positioned.fill(
+            child: AnimatedBuilder(
+              animation: barrierAnim,
+              builder: (_, __) => ColoredBox(
+                color: Colors.black.withValues(alpha: 0.35 * barrierAnim.value),
+              ),
+            ),
+          ),
+          SafeArea(
+            child: Align(
+              alignment: Alignment.bottomCenter,
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: FadeTransition(
+                  opacity: popupAnim,
+                  child: SlideTransition(
+                    position: Tween<Offset>(
+                      begin: const Offset(0, 0.08),
+                      end: Offset.zero,
+                    ).animate(popupAnim),
+                    child: content,
+                  ),
+                ),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}

useragent/lib/features/callouts/show_callout_list.dart

@@ -0,0 +1,218 @@
+import 'package:arbiter/features/callouts/active_callout.dart';
+import 'package:arbiter/features/callouts/callout_manager.dart';
+import 'package:arbiter/features/callouts/show_callout.dart';
+import 'package:arbiter/theme/palette.dart';
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:sizer/sizer.dart';
+import 'package:timeago/timeago.dart' as timeago;
+
+Future<void> showCalloutList(BuildContext context, WidgetRef ref) async {
+  final selectedId = await showGeneralDialog<String>(
+    context: context,
+    barrierDismissible: true,
+    barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
+    barrierColor: Colors.transparent,
+    transitionDuration: const Duration(milliseconds: 280),
+    pageBuilder: (_, animation, __) => _CalloutListOverlay(animation: animation),
+  );
+
+  if (selectedId != null && context.mounted) {
+    await showCallout(context, ref, selectedId);
+  }
+}
+
+class _CalloutListOverlay extends ConsumerWidget {
+  const _CalloutListOverlay({required this.animation});
+
+  final Animation<double> animation;
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final callouts = ref.watch(calloutManagerProvider);
+
+    final barrierAnim = CurvedAnimation(
+      parent: animation,
+      curve: const Interval(0, 0.3, curve: Curves.easeOut),
+    );
+    final panelAnim = CurvedAnimation(
+      parent: animation,
+      curve: const Interval(0.3, 1, curve: Curves.easeOutCubic),
+    );
+
+    return Material(
+      type: MaterialType.transparency,
+      child: Stack(
+        children: [
+          Positioned.fill(
+            child: GestureDetector(
+              behavior: HitTestBehavior.opaque,
+              onTap: () => Navigator.of(context).pop(),
+              child: AnimatedBuilder(
+                animation: barrierAnim,
+                builder: (_, __) => ColoredBox(
+                  color: Colors.black.withValues(alpha: 0.35 * barrierAnim.value),
+                ),
+              ),
+            ),
+          ),
+          SafeArea(
+            child: Align(
+              alignment: Alignment.bottomCenter,
+              child: Padding(
+                padding: EdgeInsets.all(1.6.h),
+                child: FadeTransition(
+                  opacity: panelAnim,
+                  child: SlideTransition(
+                    position: Tween<Offset>(
+                      begin: const Offset(0, 0.08),
+                      end: Offset.zero,
+                    ).animate(panelAnim),
+                    child: GestureDetector(
+                      onTap: () {},
+                      child: _CalloutListPanel(callouts: callouts),
+                    ),
+                  ),
+                ),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _CalloutListPanel extends StatelessWidget {
+  const _CalloutListPanel({required this.callouts});
+
+  final Map<String, ActiveCallout> callouts;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    return Container(
+      width: double.infinity,
+      constraints: BoxConstraints(maxHeight: 48.h),
+      decoration: BoxDecoration(
+        color: Palette.cream,
+        borderRadius: BorderRadius.circular(24),
+        border: Border.all(color: Palette.line),
+      ),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Padding(
+            padding: EdgeInsets.fromLTRB(2.h, 2.h, 2.h, 1.2.h),
+            child: Text(
+              'Notifications',
+              style: theme.textTheme.titleMedium?.copyWith(
+                color: Palette.ink,
+                fontWeight: FontWeight.w800,
+              ),
+            ),
+          ),
+          if (callouts.isEmpty)
+            Padding(
+              padding: EdgeInsets.fromLTRB(2.h, 0, 2.h, 2.h),
+              child: Text(
+                'No pending notifications.',
+                style: theme.textTheme.bodyMedium?.copyWith(
+                  color: Palette.ink.withValues(alpha: 0.50),
+                ),
+              ),
+            )
+          else
+            Flexible(
+              child: SingleChildScrollView(
+                padding: EdgeInsets.fromLTRB(1.2.h, 0, 1.2.h, 1.2.h),
+                child: Column(
+                  spacing: 0.5.h,
+                  children: [
+                    for (final entry in callouts.values)
+                      _CalloutListEntry(
+                        callout: entry,
+                        onTap: () => Navigator.of(context).pop(entry.id),
+                      ),
+                  ],
+                ),
+              ),
+            ),
+        ],
+      ),
+    );
+  }
+}
+
+class _CalloutListEntry extends StatelessWidget {
+  const _CalloutListEntry({required this.callout, required this.onTap});
+
+  final ActiveCallout callout;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    return InkWell(
+      borderRadius: BorderRadius.circular(16),
+      onTap: onTap,
+      child: Container(
+        padding: EdgeInsets.symmetric(horizontal: 1.2.h, vertical: 1.2.h),
+        decoration: BoxDecoration(
+          borderRadius: BorderRadius.circular(16),
+          border: Border.all(color: Palette.line),
+        ),
+        child: Row(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          spacing: 1.2.h,
+          children: [
+            if (callout.iconUrl != null)
+              CircleAvatar(
+                radius: 2.2.h,
+                backgroundColor: Palette.line,
+                backgroundImage: NetworkImage(callout.iconUrl!),
+              ),
+            Expanded(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                spacing: 0.3.h,
+                children: [
+                  Row(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Expanded(
+                        child: Text(
+                          callout.title,
+                          style: theme.textTheme.bodyMedium?.copyWith(
+                            color: Palette.ink,
+                            fontWeight: FontWeight.w700,
+                          ),
+                        ),
+                      ),
+                      Text(
+                        timeago.format(callout.addedAt),
+                        style: theme.textTheme.bodySmall?.copyWith(
+                          color: Palette.ink.withValues(alpha: 0.45),
+                        ),
+                      ),
+                    ],
+                  ),
+                  Text(
+                    callout.description,
+                    style: theme.textTheme.bodySmall?.copyWith(
+                      color: Palette.ink.withValues(alpha: 0.65),
+                      height: 1.4,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}