feat(server): broker agent for inter-actor coordination

Merge pull request 'refactor(server::{user_agent, client}): move auth part to separate function to not to pollute actor session with one-time concerns' (#24 ) from push-upvpzwvlwyvs into main
Reviewed-on: #24
2026-03-11 14:08:15 +01:00 · 2026-03-11 14:08:15 +01:00 · 2026-03-11 14:08:15 +01:00 · 2026-03-11 14:08:15 +01:00 · 2026-03-11 14:08:15 +01:00 · 2026-03-11 14:08:15 +01:00
46 changed files with 2900 additions and 1299 deletions
--- a/app/.dart_tool/extension_discovery/README.md
+++ b/app/.dart_tool/extension_discovery/README.md
@@ -0,0 +1,31 @@
+Extension Discovery Cache
+=========================
+
+This folder is used by `package:extension_discovery` to cache lists of
+packages that contains extensions for other packages.
+
+DO NOT USE THIS FOLDER
+----------------------
+
+ * Do not read (or rely) the contents of this folder.
+ * Do write to this folder.
+
+If you're interested in the lists of extensions stored in this folder use the
+API offered by package `extension_discovery` to get this information.
+
+If this package doesn't work for your use-case, then don't try to read the
+contents of this folder. It may change, and will not remain stable.
+
+Use package `extension_discovery`
+---------------------------------
+
+If you want to access information from this folder.
+
+Feel free to delete this folder
+-------------------------------
+
+Files in this folder act as a cache, and the cache is discarded if the files
+are older than the modification time of `.dart_tool/package_config.json`.
+
+Hence, it should never be necessary to clear this cache manually, if you find a
+need to do please file a bug.
--- a/app/.dart_tool/extension_discovery/vs_code.json
+++ b/app/.dart_tool/extension_discovery/vs_code.json
@@ -0,0 +1 @@
+{"version":2,"entries":[{"package":"app","rootUri":"../","packageUri":"lib/"}]}
--- a/protobufs/arbiter.proto
+++ b/protobufs/arbiter.proto
@@ -2,7 +2,6 @@ syntax = "proto3";

 package arbiter;

-import "auth.proto";
 import "client.proto";
 import "user_agent.proto";

@@ -12,6 +11,6 @@ message ServerInfo {
 }

 service ArbiterService {
-  rpc Client(stream ClientRequest) returns (stream ClientResponse);
-  rpc UserAgent(stream UserAgentRequest) returns (stream UserAgentResponse);
+  rpc Client(stream arbiter.client.ClientRequest) returns (stream arbiter.client.ClientResponse);
+  rpc UserAgent(stream arbiter.user_agent.UserAgentRequest) returns (stream arbiter.user_agent.UserAgentResponse);
 }
--- a/protobufs/auth.proto
+++ b/protobufs/auth.proto
@@ -1,35 +0,0 @@
-syntax = "proto3";
-
-package arbiter.auth;
-
-import "google/protobuf/timestamp.proto";
-
-message AuthChallengeRequest {
-  bytes pubkey = 1;
-  optional string bootstrap_token = 2;
-}
-
-message AuthChallenge {
-  bytes pubkey = 1;
-  int32 nonce = 2;
-}
-
-message AuthChallengeSolution {
-  bytes signature = 1;
-}
-
-message AuthOk {}
-
-message ClientMessage {
-  oneof payload {
-    AuthChallengeRequest auth_challenge_request = 1;
-    AuthChallengeSolution auth_challenge_solution = 2;
-  }
-}
-
-message ServerMessage {
-  oneof payload {
-    AuthChallenge auth_challenge = 1;
-    AuthOk auth_ok = 2;
-  }
-}
--- a/protobufs/client.proto
+++ b/protobufs/client.proto
@@ -1,17 +1,32 @@
 syntax = "proto3";

-package arbiter;
+package arbiter.client;

-import "auth.proto";
+message AuthChallengeRequest {
+  bytes pubkey = 1;
+}
+
+message AuthChallenge {
+  bytes pubkey = 1;
+  int32 nonce = 2;
+}
+
+message AuthChallengeSolution {
+  bytes signature = 1;
+}
+
+message AuthOk {}

 message ClientRequest {
  oneof payload {
-    arbiter.auth.ClientMessage auth_message = 1;
+    AuthChallengeRequest auth_challenge_request = 1;
+    AuthChallengeSolution auth_challenge_solution = 2;
  }
 }

 message ClientResponse {
  oneof payload {
-    arbiter.auth.ServerMessage auth_message = 1;
+    AuthChallenge auth_challenge = 1;
+    AuthOk auth_ok = 2;
  }
 }
--- a/protobufs/user_agent.proto
+++ b/protobufs/user_agent.proto
@@ -1,10 +1,25 @@
 syntax = "proto3";

-package arbiter;
+package arbiter.user_agent;

-import "auth.proto";
 import "google/protobuf/empty.proto";

+message AuthChallengeRequest {
+  bytes pubkey = 1;
+  optional string bootstrap_token = 2;
+}
+
+message AuthChallenge {
+  bytes pubkey = 1;
+  int32 nonce = 2;
+}
+
+message AuthChallengeSolution {
+  bytes signature = 1;
+}
+
+message AuthOk {}
+
 message UnsealStart {
  bytes client_pubkey = 1;
 }
@@ -35,17 +50,19 @@ enum VaultState {

 message UserAgentRequest {
  oneof payload {
-    arbiter.auth.ClientMessage auth_message = 1;
-    UnsealStart unseal_start = 2;
-    UnsealEncryptedKey unseal_encrypted_key = 3;
-    google.protobuf.Empty query_vault_state = 4;
+    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;
  }
 }
 message UserAgentResponse {
  oneof payload {
-    arbiter.auth.ServerMessage auth_message = 1;
-    UnsealStartResponse unseal_start_response = 2;
-    UnsealResult unseal_result = 3;
-    VaultState vault_state = 4;
+    AuthChallenge auth_challenge = 1;
+    AuthOk auth_ok = 2;
+    UnsealStartResponse unseal_start_response = 3;
+    UnsealResult unseal_result = 4;
+    VaultState vault_state = 5;
  }
 }
--- a/scripts/pycache/gen_erc20_registry.cpython-314.pyc
+++ b/scripts/pycache/gen_erc20_registry.cpython-314.pyc
--- a/server/Cargo.lock
+++ b/server/Cargo.lock
@@ -47,9 +47,9 @@ dependencies = [

 [[package]]
 name = "anyhow"
-version = "1.0.101"
+version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f0e0fee31ef5ed1ba1316088939cea399010ed7731dba877ed44aeb407a75ea"
+checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"

 [[package]]
 name = "arbiter-client"
@@ -59,11 +59,14 @@ version = "0.1.0"
 name = "arbiter-proto"
 version = "0.1.0"
 dependencies = [
+ "async-trait",
 "base64",
 "futures",
+ "hex",
 "kameo",
 "miette",
 "prost",
+ "prost-types",
 "rand",
 "rcgen",
 "rstest",
@@ -120,10 +123,15 @@ name = "arbiter-useragent"
 version = "0.1.0"
 dependencies = [
 "arbiter-proto",
+ "async-trait",
 "ed25519-dalek",
+ "http",
 "kameo",
+ "rustls-webpki",
 "smlang",
+ "thiserror",
 "tokio",
+ "tokio-stream",
 "tonic",
 "tracing",
 "x25519-dalek",
@@ -166,7 +174,7 @@ checksum = "3109e49b1e4909e9db6515a30c633684d68cdeaa252f215214cb4fa1a5bfee2c"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 "synstructure",
 ]

@@ -178,7 +186,7 @@ checksum = "7b18050c2cd6fe86c3a76584ef5e0baf286d038cda203eb6223df2cc413565f7"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -189,7 +197,7 @@ checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -206,9 +214,9 @@ checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"

 [[package]]
 name = "aws-lc-rs"
-version = "1.15.4"
+version = "1.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b7b6141e96a8c160799cc2d5adecd5cbbe5054cb8c7c4af53da0f83bb7ad256"
+checksum = "94bffc006df10ac2a68c83692d734a465f8ee6c5b384d8545a636f81d858f4bf"
 dependencies = [
 "aws-lc-sys",
 "untrusted 0.7.1",
@@ -217,9 +225,9 @@ dependencies = [

 [[package]]
 name = "aws-lc-sys"
-version = "0.37.1"
+version = "0.38.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b092fe214090261288111db7a2b2c2118e5a7f30dc2569f1732c4069a6840549"
+checksum = "4321e568ed89bb5a7d291a7f37997c2c0df89809d7b6d12062c81ddb54aa782e"
 dependencies = [
 "cc",
 "cmake",
@@ -344,18 +352,18 @@ dependencies = [

 [[package]]
 name = "block-buffer"
-version = "0.11.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96eb4cdd6cf1b31d671e9efe75c5d1ec614776856cefbe109ca373554a6d514f"
+checksum = "cdd35008169921d80bc60d3d0ab416eecb028c4cd653352907921d95084790be"
 dependencies = [
 "hybrid-array",
 ]

 [[package]]
 name = "bumpalo"
-version = "3.19.1"
+version = "3.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5dd9dc738b7a8311c7ade152424974d8115f2cdad61e8dab8dac9f2362298510"
+checksum = "5d20789868f4b01b2f2caec9f5c4e0213b41e3e5702a50157d699ae31ced2fcb"

 [[package]]
 name = "bytes"
@@ -418,9 +426,9 @@ dependencies = [

 [[package]]
 name = "chrono"
-version = "0.4.43"
+version = "0.4.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fac4744fb15ae8337dc853fee7fb3f4e48c0fbaa23d0afe49c447b4fab126118"
+checksum = "c673075a2e0e5f4a1dde27ce9dee1ea4558c7ffe648f576438a20ca1d2acc4b0"
 dependencies = [
 "iana-time-zone",
 "js-sys",
@@ -514,9 +522,9 @@ dependencies = [

 [[package]]
 name = "crypto-common"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "211f05e03c7d03754740fd9e585de910a095d6b99f8bcfffdef8319fa02a8331"
+checksum = "77727bb15fa921304124b128af125e7e3b968275d1b108b379190264f4423710"
 dependencies = [
 "hybrid-array",
 ]
@@ -545,7 +553,7 @@ dependencies = [
 "cfg-if",
 "cpufeatures 0.2.17",
 "curve25519-dalek-derive",
- "digest 0.11.0",
+ "digest 0.11.1",
 "fiat-crypto 0.3.0",
 "rustc_version",
 "subtle",
@@ -560,7 +568,7 @@ checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -584,7 +592,7 @@ dependencies = [
 "proc-macro2",
 "quote",
 "strsim",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -595,7 +603,7 @@ checksum = "d38308df82d1080de0afee5d069fa14b0326a88c14f15c5ccda35b4a6c414c81"
 dependencies = [
 "darling_core",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -634,9 +642,9 @@ dependencies = [

 [[package]]
 name = "deranged"
-version = "0.5.6"
+version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc3dc5ad92c2e2d1c193bbbbdf2ea477cb81331de4f3103f267ca18368b988c4"
+checksum = "7cd812cc2bc1d69d4764bd80df88b4317eaef9e773c75226407d9bc0876b211c"
 dependencies = [
 "powerfmt",
 ]
@@ -682,7 +690,7 @@ dependencies = [
 "dsl_auto_type",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -702,7 +710,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fe2444076b48641147115697648dc743c2c00b61adade0f01ce67133c7babe8c"
 dependencies = [
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -718,12 +726,12 @@ dependencies = [

 [[package]]
 name = "digest"
-version = "0.11.0"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8bf3682cdec91817be507e4aa104314898b95b84d74f3d43882210101a545b6"
+checksum = "285743a676ccb6b3e116bc14cc69319b957867930ae9c4822f8e0f54509d7243"
 dependencies = [
- "block-buffer 0.11.0",
- "crypto-common 0.2.0",
+ "block-buffer 0.12.0",
+ "crypto-common 0.2.1",
 ]

 [[package]]
@@ -734,7 +742,7 @@ checksum = "97369cbbc041bc366949bc74d34658d6cda5621039731c6310521892a3a20ae0"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -754,7 +762,7 @@ dependencies = [
 "heck",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -949,7 +957,7 @@ checksum = "e835b70203e41293343137df5c0664546da5745f82ec9b84d40be8336958447b"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -1016,19 +1024,19 @@ checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
 dependencies = [
 "cfg-if",
 "libc",
- "r-efi",
+ "r-efi 5.3.0",
 "wasip2",
 ]

 [[package]]
 name = "getrandom"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "139ef39800118c7683f2fd3c98c1b23c09ae076556b435f8e9064ae108aaeeec"
+checksum = "0de51e6874e94e7bf76d726fc5d13ba782deca734ff60d5bb2fb2607c7406555"
 dependencies = [
 "cfg-if",
 "libc",
- "r-efi",
+ "r-efi 6.0.0",
 "rand_core 0.10.0",
 "wasip2",
 "wasip3",
@@ -1095,6 +1103,12 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"

+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+
 [[package]]
 name = "http"
 version = "1.4.0"
@@ -1142,9 +1156,9 @@ checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"

 [[package]]
 name = "hybrid-array"
-version = "0.4.7"
+version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1b229d73f5803b562cc26e4da0396c8610a4ee209f4fac8fa4f8d709166dc45"
+checksum = "8655f91cd07f2b9d0c24137bd650fe69617773435ee5ec83022377777ce65ef1"
 dependencies = [
 "typenum",
 ]
@@ -1409,9 +1423,9 @@ dependencies = [

 [[package]]
 name = "js-sys"
-version = "0.3.85"
+version = "0.3.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c942ebf8e95485ca0d52d97da7c5a2c387d0e7f0ba4c35e93bfcaee045955b3"
+checksum = "b49715b7073f385ba4bc528e5747d02e66cb39c6146efb66b781f131f0fb399c"
 dependencies = [
 "once_cell",
 "wasm-bindgen",
@@ -1441,7 +1455,7 @@ dependencies = [
 "heck",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -1458,9 +1472,9 @@ checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"

 [[package]]
 name = "libc"
-version = "0.2.182"
+version = "0.2.183"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6800badb6cb2082ffd7b6a67e6125bb39f18782f793520caee8cb8846be06112"
+checksum = "b5b646652bf6661599e1da8901b3b9522896f01e736bad5f723fe7a3a27f899d"

 [[package]]
 name = "libsqlite3-sys"
@@ -1474,9 +1488,9 @@ dependencies = [

 [[package]]
 name = "linux-raw-sys"
-version = "0.11.0"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df1d3c3b53da64cf5760482273a98e575c651a67eec7f77df96b5b642de8f039"
+checksum = "32a66949e030da00e8c7d4434b251670a91556f4144941d37452769c25d58a53"

 [[package]]
 name = "litemap"
@@ -1558,7 +1572,7 @@ checksum = "db5b29714e950dbb20d5e6f74f9dcec4edbcc1067bb7f8ed198c097b8c1a818b"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -1706,9 +1720,9 @@ checksum = "c08d65885ee38876c4f86fa503fb49d7b507c2b62552df7c70b2fce627e06381"

 [[package]]
 name = "owo-colors"
-version = "4.2.3"
+version = "4.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c6901729fa79e91a0913333229e9ca5dc725089d1c363b2f4b4760709dc4a52"
+checksum = "d211803b9b6b570f68772237e415a029d5a50c65d382910b879fb19d3271f94d"

 [[package]]
 name = "parking_lot"
@@ -1773,29 +1787,29 @@ dependencies = [

 [[package]]
 name = "pin-project"
-version = "1.1.10"
+version = "1.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "677f1add503faace112b9f1373e43e9e054bfdd22ff1a63c1bc485eaec6a6a8a"
+checksum = "f1749c7ed4bcaf4c3d0a3efc28538844fb29bcdd7d2b67b2be7e20ba861ff517"
 dependencies = [
 "pin-project-internal",
 ]

 [[package]]
 name = "pin-project-internal"
-version = "1.1.10"
+version = "1.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e918e4ff8c4549eb882f14b3a4bc8c8bc93de829416eacf579f1207a8fbf861"
+checksum = "d9b20ed30f105399776b9c883e68e536ef602a16ae6f596d2c473591d6ad64c6"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
 name = "pin-project-lite"
-version = "0.2.16"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
+checksum = "a89322df9ebe1c1578d689c92318e070967d1042b512afbe49518723f4e6d5cd"

 [[package]]
 name = "pin-utils"
@@ -1848,14 +1862,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "479ca8adacdd7ce8f1fb39ce9ecccbfe93a3f1344b3d0d97f20bc0196208f62b"
 dependencies = [
 "proc-macro2",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
 name = "proc-macro-crate"
-version = "3.4.0"
+version = "3.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "219cb19e96be00ab2e37d6e299658a0cfa83e52429179969b0f0121b4ac46983"
+checksum = "e67ba7e9b2b56446f1d419b1d807906278ffa1a658a8a5d8a39dcb1f5a78614f"
 dependencies = [
 "toml_edit",
 ]
@@ -1920,7 +1934,7 @@ dependencies = [
 "pulldown-cmark",
 "pulldown-cmark-to-cmark",
 "regex",
- "syn 2.0.115",
+ "syn 2.0.117",
 "tempfile",
 ]

@@ -1934,7 +1948,7 @@ dependencies = [
 "itertools",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -1943,14 +1957,15 @@ version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8991c4cbdb8bc5b11f0b074ffe286c30e523de90fee5ba8132f1399f23cb3dd7"
 dependencies = [
+ "chrono",
 "prost",
 ]

 [[package]]
 name = "pulldown-cmark"
-version = "0.13.0"
+version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e8bbe1a966bd2f362681a44f6edce3c2310ac21e4d5067a6e7ec396297a6ea0"
+checksum = "83c41efbf8f90ac44de7f3a868f0867851d261b56291732d0cbf7cceaaeb55a6"
 dependencies = [
 "bitflags",
 "memchr",
@@ -1968,9 +1983,9 @@ dependencies = [

 [[package]]
 name = "quote"
-version = "1.0.44"
+version = "1.0.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "21b2ebcf727b7760c461f091f9f0f539b77b8e87f2fd88131e7f1b433b3cece4"
+checksum = "41f2619966050689382d2b44f664f4bc593e129785a36d6ee376ddf37259b924"
 dependencies = [
 "proc-macro2",
 ]
@@ -1981,6 +1996,12 @@ version = "5.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"

+[[package]]
+name = "r-efi"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
+
 [[package]]
 name = "rand"
 version = "0.10.0"
@@ -1988,7 +2009,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bc266eb313df6c5c09c1c7b1fbe2510961e5bcd3add930c1e31f7ed9da0feff8"
 dependencies = [
 "chacha20 0.10.0",
- "getrandom 0.4.1",
+ "getrandom 0.4.2",
 "rand_core 0.10.0",
 ]

@@ -2056,9 +2077,9 @@ dependencies = [

 [[package]]
 name = "regex-syntax"
-version = "0.8.9"
+version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a96887878f22d7bad8a3b6dc5b7440e0ada9a245242924394987b21cf2210a4c"
+checksum = "dc897dd8d9e8bd1ed8cdad82b5966c3e0ecae09fb1907d58efaa013543185d0a"

 [[package]]
 name = "relative-path"
@@ -2075,7 +2096,7 @@ dependencies = [
 "proc-macro-error",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -2127,7 +2148,7 @@ dependencies = [
 "regex",
 "relative-path",
 "rustc_version",
- "syn 2.0.115",
+ "syn 2.0.117",
 "unicode-ident",
 ]

@@ -2157,9 +2178,9 @@ dependencies = [

 [[package]]
 name = "rustix"
-version = "1.1.3"
+version = "1.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "146c9e247ccc180c1f61615433868c99f3de3ae256a30a43b49f67c2d9171f34"
+checksum = "b6fe4565b9518b83ef4f91bb47ce29620ca828bd32cb7e408f0062e9930ba190"
 dependencies = [
 "bitflags",
 "errno",
@@ -2170,9 +2191,9 @@ dependencies = [

 [[package]]
 name = "rustls"
-version = "0.23.36"
+version = "0.23.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c665f33d38cea657d9614f766881e4d510e0eda4239891eea56b4cadcf01801b"
+checksum = "758025cb5fccfd3bc2fd74708fd4682be41d99e5dff73c377c0646c6012c73a4"
 dependencies = [
 "aws-lc-rs",
 "log",
@@ -2267,7 +2288,7 @@ checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -2300,7 +2321,7 @@ checksum = "7c5f3b1e2dc8aad28310d8410bd4d7e180eca65fca176c52ab00d364475d0024"
 dependencies = [
 "cfg-if",
 "cpufeatures 0.2.17",
- "digest 0.11.0",
+ "digest 0.11.1",
 ]

 [[package]]
@@ -2381,12 +2402,12 @@ dependencies = [

 [[package]]
 name = "socket2"
-version = "0.6.2"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86f4aa3ad99f2088c990dfa82d367e19cb29268ed67c574d10d0a4bfe71f07e0"
+checksum = "3a766e1110788c36f4fa1c2b71b387a7815aa65f88ce0229841826633d93723e"
 dependencies = [
 "libc",
- "windows-sys 0.60.2",
+ "windows-sys 0.61.2",
 ]

 [[package]]
@@ -2437,7 +2458,7 @@ dependencies = [
 "heck",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -2480,9 +2501,9 @@ dependencies = [

 [[package]]
 name = "syn"
-version = "2.0.115"
+version = "2.0.117"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e614ed320ac28113fa64972c4262d5dbc89deacdfd00c34a3e4cea073243c12"
+checksum = "e665b8803e7b1d2a727f4023456bbbbe74da67099c585258af0ad9c5013b9b99"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -2503,17 +2524,17 @@ checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
 name = "tempfile"
-version = "3.25.0"
+version = "3.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0136791f7c95b1f6dd99f9cc786b91bb81c3800b639b3478e561ddb7be95e5f1"
+checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd"
 dependencies = [
 "fastrand",
- "getrandom 0.4.1",
+ "getrandom 0.4.2",
 "once_cell",
 "rustix",
 "windows-sys 0.61.2",
@@ -2547,7 +2568,7 @@ checksum = "be35209fd0781c5401458ab66e4f98accf63553e8fae7425503e92fdd319783b"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -2577,7 +2598,7 @@ checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -2632,9 +2653,9 @@ dependencies = [

 [[package]]
 name = "tokio"
-version = "1.49.0"
+version = "1.50.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72a2903cd7736441aac9df9d7688bd0ce48edccaadf181c3b90be801e81d3d86"
+checksum = "27ad5e34374e03cfffefc301becb44e9dc3c17584f414349ebe29ed26661822d"
 dependencies = [
 "bytes",
 "libc",
@@ -2650,13 +2671,13 @@ dependencies = [

 [[package]]
 name = "tokio-macros"
-version = "2.6.0"
+version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af407857209536a95c8e56f8231ef2c2e2aff839b22e07a1ffcbc617e9db9fa5"
+checksum = "5c55a2eff8b69ce66c84f85e1da1c233edc36ceb85a2058d11b0d6a3c7e7569c"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -2702,7 +2723,7 @@ checksum = "cf92845e79fc2e2def6a5d828f0801e29a2f8acc037becc5ab08595c7d5e9863"
 dependencies = [
 "serde_core",
 "serde_spanned",
- "toml_datetime",
+ "toml_datetime 0.7.5+spec-1.1.0",
 "toml_parser",
 "winnow",
 ]
@@ -2717,31 +2738,40 @@ dependencies = [
 ]

 [[package]]
-name = "toml_edit"
-version = "0.23.10+spec-1.0.0"
+name = "toml_datetime"
+version = "1.0.0+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "84c8b9f757e028cee9fa244aea147aab2a9ec09d5325a9b01e0a49730c2b5269"
+checksum = "32c2555c699578a4f59f0cc68e5116c8d7cabbd45e1409b989d4be085b53f13e"
+dependencies = [
+ "serde_core",
+]
+
+[[package]]
+name = "toml_edit"
+version = "0.25.4+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7193cbd0ce53dc966037f54351dbbcf0d5a642c7f0038c382ef9e677ce8c13f2"
 dependencies = [
 "indexmap",
- "toml_datetime",
+ "toml_datetime 1.0.0+spec-1.1.0",
 "toml_parser",
 "winnow",
 ]

 [[package]]
 name = "toml_parser"
-version = "1.0.8+spec-1.1.0"
+version = "1.0.9+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0742ff5ff03ea7e67c8ae6c93cac239e0d9784833362da3f9a9c1da8dfefcbdc"
+checksum = "702d4415e08923e7e1ef96cd5727c0dfed80b4d2fa25db9647fe5eb6f7c5a4c4"
 dependencies = [
 "winnow",
 ]

 [[package]]
 name = "tonic"
-version = "0.14.4"
+version = "0.14.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f32a6f80051a4111560201420c7885d0082ba9efe2ab61875c587bb6b18b9a0"
+checksum = "fec7c61a0695dc1887c1b53952990f3ad2e3a31453e1f49f10e75424943a93ec"
 dependencies = [
 "async-trait",
 "axum",
@@ -2771,21 +2801,21 @@ dependencies = [

 [[package]]
 name = "tonic-build"
-version = "0.14.4"
+version = "0.14.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce6d8958ed3be404120ca43ffa0fb1e1fc7be214e96c8d33bd43a131b6eebc9e"
+checksum = "1882ac3bf5ef12877d7ed57aad87e75154c11931c2ba7e6cde5e22d63522c734"
 dependencies = [
 "prettyplease",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
 name = "tonic-prost"
-version = "0.14.4"
+version = "0.14.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f86539c0089bfd09b1f8c0ab0239d80392af74c21bc9e0f15e1b4aca4c1647f"
+checksum = "a55376a0bbaa4975a3f10d009ad763d8f4108f067c7c2e74f3001fb49778d309"
 dependencies = [
 "bytes",
 "prost",
@@ -2794,16 +2824,16 @@ dependencies = [

 [[package]]
 name = "tonic-prost-build"
-version = "0.14.4"
+version = "0.14.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "65873ace111e90344b8973e94a1fc817c924473affff24629281f90daed1cd2e"
+checksum = "f3144df636917574672e93d0f56d7edec49f90305749c668df5101751bb8f95a"
 dependencies = [
 "prettyplease",
 "proc-macro2",
 "prost-build",
 "prost-types",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 "tempfile",
 "tonic-build",
 ]
@@ -2858,7 +2888,7 @@ checksum = "7490cfa5ec963746568740651ac6781f701c9c5ea257c58e057f3ba8cf69e8da"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -2920,9 +2950,9 @@ checksum = "dbc4bc3a9f746d862c45cb89d705aa10f187bb96c76001afab07a0d35ce60142"

 [[package]]
 name = "unicode-ident"
-version = "1.0.23"
+version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "537dd038a89878be9b64dd4bd1b260315c1bb94f4d784956b81e27a088d9a09e"
+checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"

 [[package]]
 name = "unicode-linebreak"
@@ -2990,9 +3020,9 @@ checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"

 [[package]]
 name = "uuid"
-version = "1.21.0"
+version = "1.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b672338555252d43fd2240c714dc444b8c6fb0a5c5335e65a07bba7742735ddb"
+checksum = "a68d3c8f01c0cfa54a75291d83601161799e4a89a39e0929f4b0354d88757a37"
 dependencies = [
 "js-sys",
 "wasm-bindgen",
@@ -3051,9 +3081,9 @@ dependencies = [

 [[package]]
 name = "wasm-bindgen"
-version = "0.2.108"
+version = "0.2.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64024a30ec1e37399cf85a7ffefebdb72205ca1c972291c51512360d90bd8566"
+checksum = "6532f9a5c1ece3798cb1c2cfdba640b9b3ba884f5db45973a6f442510a87d38e"
 dependencies = [
 "cfg-if",
 "once_cell",
@@ -3064,9 +3094,9 @@ dependencies = [

 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.108"
+version = "0.2.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "008b239d9c740232e71bd39e8ef6429d27097518b6b30bdf9086833bd5b6d608"
+checksum = "18a2d50fcf105fb33bb15f00e7a77b772945a2ee45dcf454961fd843e74c18e6"
 dependencies = [
 "quote",
 "wasm-bindgen-macro-support",
@@ -3074,22 +3104,22 @@ dependencies = [

 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.108"
+version = "0.2.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5256bae2d58f54820e6490f9839c49780dff84c65aeab9e772f15d5f0e913a55"
+checksum = "03ce4caeaac547cdf713d280eda22a730824dd11e6b8c3ca9e42247b25c631e3"
 dependencies = [
 "bumpalo",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 "wasm-bindgen-shared",
 ]

 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.108"
+version = "0.2.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f01b580c9ac74c8d8f0c0e4afb04eeef2acf145458e52c03845ee9cd23e3d12"
+checksum = "75a326b8c223ee17883a4251907455a2431acc2791c98c26279376490c378c16"
 dependencies = [
 "unicode-ident",
 ]
@@ -3171,7 +3201,7 @@ checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -3182,7 +3212,7 @@ checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -3376,9 +3406,9 @@ checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"

 [[package]]
 name = "winnow"
-version = "0.7.14"
+version = "0.7.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a5364e9d77fcdeeaa6062ced926ee3381faa2ee02d3eb83a5c27a8825540829"
+checksum = "df79d97927682d2fd8adb29682d1140b343be4ac0f08fd68b7765d9c059d3945"
 dependencies = [
 "memchr",
 ]
@@ -3413,7 +3443,7 @@ dependencies = [
 "heck",
 "indexmap",
 "prettyplease",
- "syn 2.0.115",
+ "syn 2.0.117",
 "wasm-metadata",
 "wit-bindgen-core",
 "wit-component",
@@ -3429,7 +3459,7 @@ dependencies = [
 "prettyplease",
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 "wit-bindgen-core",
 "wit-bindgen-rust",
 ]
@@ -3535,7 +3565,7 @@ checksum = "b659052874eb698efe5b9e8cf382204678a0086ebf46982b79d6ca3182927e5d"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 "synstructure",
 ]

@@ -3556,7 +3586,7 @@ checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 "synstructure",
 ]

@@ -3577,7 +3607,7 @@ checksum = "85a5b4158499876c763cb03bc4e49185d3cccbabb15b33c627f7884f43db852e"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
@@ -3610,7 +3640,7 @@ checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
 dependencies = [
 "proc-macro2",
 "quote",
- "syn 2.0.115",
+ "syn 2.0.117",
 ]

 [[package]]
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -23,6 +23,7 @@ async-trait = "0.1.89"
 futures = "0.3.31"
 tokio-stream = { version = "0.1.18", features = ["full"] }
 kameo = "0.19.2"
+prost-types = { version = "0.14.3", features = ["chrono"] }
 x25519-dalek = { version = "2.0.1", features = ["getrandom"] }
 rstest = "0.26.1"
 rustls-pki-types = "1.14.0"
--- a/server/crates/arbiter-proto/Cargo.toml
+++ b/server/crates/arbiter-proto/Cargo.toml
@@ -9,6 +9,7 @@ license = "Apache-2.0"
 tonic.workspace = true
 tokio.workspace = true
 futures.workspace = true
+hex = "0.4.3"
 tonic-prost = "0.14.3"
 prost = "0.14.3"
 kameo.workspace = true
@@ -17,8 +18,9 @@ miette.workspace = true
 thiserror.workspace = true
 rustls-pki-types.workspace = true
 base64 = "0.22.1"
+prost-types.workspace = true
 tracing.workspace = true
-
+async-trait.workspace = true

 [build-dependencies]
 tonic-prost-build = "0.14.3"
--- a/server/crates/arbiter-proto/build.rs
+++ b/server/crates/arbiter-proto/build.rs
@@ -11,7 +11,8 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
        .compile_protos(
            &[
                format!("{}/arbiter.proto", PROTOBUF_DIR),
-                format!("{}/auth.proto", PROTOBUF_DIR),
+                format!("{}/user_agent.proto", PROTOBUF_DIR),
+                format!("{}/client.proto", PROTOBUF_DIR),
            ],
            &[PROTOBUF_DIR.to_string()],
        )
--- a/server/crates/arbiter-proto/src/lib.rs
+++ b/server/crates/arbiter-proto/src/lib.rs
@@ -3,13 +3,15 @@ pub mod url;

 use base64::{Engine, prelude::BASE64_STANDARD};

-use crate::proto::auth::AuthChallenge;
-
 pub mod proto {
    tonic::include_proto!("arbiter");

-    pub mod auth {
-        tonic::include_proto!("arbiter.auth");
+    pub mod user_agent {
+        tonic::include_proto!("arbiter.user_agent");
+    }
+
+    pub mod client {
+        tonic::include_proto!("arbiter.client");
    }
 }

@@ -28,7 +30,7 @@ pub fn home_path() -> Result<std::path::PathBuf, std::io::Error> {
    Ok(arbiter_home)
 }

-pub fn format_challenge(challenge: &AuthChallenge) -> Vec<u8> {
-    let concat_form = format!("{}:{}", challenge.nonce, BASE64_STANDARD.encode(&challenge.pubkey));
-    concat_form.into_bytes().to_vec()
+pub fn format_challenge(nonce: i32, pubkey: &[u8]) -> Vec<u8> {
+    let concat_form = format!("{}:{}", nonce, BASE64_STANDARD.encode(pubkey));
+    concat_form.into_bytes()
 }
--- a/server/crates/arbiter-proto/src/transport.rs
+++ b/server/crates/arbiter-proto/src/transport.rs
@@ -1,371 +1,293 @@
-//! Transport abstraction layer for bridging gRPC bidirectional streaming with kameo actors.
+//! Transport-facing abstractions for protocol/session code.
 //!
-//! This module provides a clean separation between the gRPC transport layer and business logic
-//! by modeling the connection as two linked kameo actors:
+//! This module separates three concerns:
 //!
-//! - A **transport actor** ([`GrpcTransportActor`]) that owns the gRPC stream and channel,
-//!   forwarding inbound messages to the business actor and outbound messages to the client.
-//! - A **business logic actor** that receives inbound messages from the transport actor and
-//!   sends outbound messages back through the transport actor.
+//! - protocol/session logic wants a small duplex interface ([`Bi`])
+//! - transport adapters push concrete stream items to an underlying IO layer
+//! - transport boundaries translate between protocol-facing and transport-facing
+//!   item types via direction-specific converters
 //!
-//! The [`wire()`] function sets up bidirectional linking between the two actors, ensuring
-//! that if either actor dies, the other is notified and can shut down gracefully.
+//! [`Bi`] is intentionally minimal and transport-agnostic:
+//! - [`Bi::recv`] yields inbound protocol messages
+//! - [`Bi::send`] accepts outbound protocol/domain items
 //!
-//! # Terminology
+//! # Generic Ordering Rule
 //!
-//! - **InboundMessage**: a message received by the transport actor from the channel/socket
-//!   and forwarded to the business actor.
-//! - **OutboundMessage**: a message produced by the business actor and sent to the transport
-//!   actor to be forwarded to the channel/socket.
+//! This module uses a single convention consistently: when a type or trait is
+//! parameterized by protocol message directions, the generic parameters are
+//! declared as `Inbound` first, then `Outbound`.
 //!
-//! # Architecture
+//! For [`Bi`], that means `Bi<Inbound, Outbound>`:
+//! - `recv() -> Option<Inbound>`
+//! - `send(Outbound)`
+//!
+//! For adapter types that are parameterized by direction-specific converters,
+//! inbound-related converter parameters are declared before outbound-related
+//! converter parameters.
+//!
+//! [`RecvConverter`] and [`SendConverter`] are infallible conversion traits used
+//! by adapters to map between protocol-facing and transport-facing item types.
+//! The traits themselves are not result-aware; adapters decide how transport
+//! errors are handled before (or instead of) conversion.
+//!
+//! [`grpc::GrpcAdapter`] combines:
+//! - a tonic inbound stream
+//! - a Tokio sender for outbound transport items
+//! - a [`RecvConverter`] for the receive path
+//! - a [`SendConverter`] for the send path
+//!
+//! [`DummyTransport`] is a no-op implementation useful for tests and local actor
+//! execution where no real network stream exists.
+//!
+//! # Component Interaction
 //!
 //! ```text
-//! gRPC Stream ──InboundMessage──▶ GrpcTransportActor ──tell(InboundMessage)──▶ BusinessActor
-//!                                 ▲                                    │
-//!                                 └─tell(Result<OutboundMessage, _>)────┘
-//!                                 │
-//!                          mpsc::Sender ──▶ Client
+//! inbound (network -> protocol)
+//! ============================
+//!
+//! tonic::Streaming<RecvTransport>
+//!     -> grpc::GrpcAdapter::recv()
+//!          |
+//!          +--> on `Ok(item)`: RecvConverter::convert(RecvTransport) -> Inbound
+//!          +--> on `Err(status)`: log error and close stream (`None`)
+//!     -> Bi::recv()
+//!     -> protocol/session actor
+//!
+//! outbound (protocol -> network)
+//! ==============================
+//!
+//! protocol/session actor
+//!     -> Bi::send(Outbound)
+//!     -> grpc::GrpcAdapter::send()
+//!          |
+//!          +--> SendConverter::convert(Outbound) -> SendTransport
+//!     -> Tokio mpsc::Sender<SendTransport>
+//!     -> tonic response stream
 //! ```
 //!
-//! # Example
+//! # Design Notes
 //!
-//! ```rust,ignore
-//! let (tx, rx) = mpsc::channel(1000);
-//! let context = server_context.clone();
-//!
-//! wire(
-//!     |transport_ref| MyBusinessActor::new(context, transport_ref),
-//!     |business_recipient, business_id| GrpcTransportActor {
-//!         sender: tx,
-//!         receiver: grpc_stream,
-//!         business_logic_actor: business_recipient,
-//!         business_logic_actor_id: business_id,
-//!     },
-//! ).await;
-//!
-//! Ok(Response::new(ReceiverStream::new(rx)))
-//! ```
+//! - `send()` returns [`Error`] only for transport delivery failures (for
+//!   example, when the outbound channel is closed).
+//! - [`grpc::GrpcAdapter`] logs tonic receive errors and treats them as stream
+//!   closure (`None`).
+//! - When protocol-facing and transport-facing types are identical, use
+//!   [`IdentityRecvConverter`] / [`IdentitySendConverter`].

-use futures::{Stream, StreamExt};
-use kameo::{
-    Actor,
-    actor::{ActorRef, PreparedActor, Recipient, Spawn, WeakActorRef},
-    mailbox::Signal,
-    prelude::Message,
-};
-use tokio::{
-    select,
-    sync::mpsc::{self, error::SendError},
-};
-use tonic::{Status, Streaming};
-use tracing::{debug, error};
+use std::marker::PhantomData;

-/// A bidirectional stream abstraction for sans-io testing.
-///
-/// Combines a [`Stream`] of incoming messages with the ability to [`send`](Bi::send)
-/// outgoing responses. This trait allows business logic to be tested without a real
-/// gRPC connection by swapping in an in-memory implementation.
-///
-/// # Type Parameters
-/// - `T`: `InboundMessage` received from the channel/socket (e.g., `UserAgentRequest`)
-/// - `U`: `OutboundMessage` sent to the channel/socket (e.g., `UserAgentResponse`)
-pub trait Bi<T, U>: Stream<Item = Result<T, Status>> + Send + Sync + 'static {
-    type Error;
-    fn send(
-        &mut self,
-        item: Result<U, Status>,
-    ) -> impl std::future::Future<Output = Result<(), Self::Error>> + Send;
+use async_trait::async_trait;
+
+/// Errors returned by transport adapters implementing [`Bi`].
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("Transport channel is closed")]
+    ChannelClosed,
 }

-/// Concrete [`Bi`] implementation backed by a tonic gRPC [`Streaming`] and an [`mpsc::Sender`].
+/// Minimal bidirectional transport abstraction used by protocol code.
 ///
-/// This is the production implementation used in gRPC service handlers. The `request_stream`
-/// receives messages from the client, and `response_sender` sends responses back.
-pub struct BiStream<T, U> {
-    pub request_stream: Streaming<T>,
-    pub response_sender: mpsc::Sender<Result<U, Status>>,
+/// `Bi<Inbound, Outbound>` models a duplex 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>;
+
+    async fn recv(&mut self) -> Option<Inbound>;
 }

-impl<T, U> Stream for BiStream<T, U>
-where
-    T: Send + 'static,
-    U: Send + 'static,
-{
-    type Item = Result<T, Status>;
+/// Converts transport-facing inbound items into protocol-facing inbound items.
+pub trait RecvConverter: Send + Sync + 'static {
+    type Input;
+    type Output;

-    fn poll_next(
-        mut self: std::pin::Pin<&mut Self>,
-        cx: &mut std::task::Context<'_>,
-    ) -> std::task::Poll<Option<Self::Item>> {
-        self.request_stream.poll_next_unpin(cx)
-    }
+    fn convert(&self, item: Self::Input) -> Self::Output;
 }

-impl<T, U> Bi<T, U> for BiStream<T, U>
-where
-    T: Send + 'static,
-    U: Send + 'static,
-{
-    type Error = SendError<Result<U, Status>>;
+/// Converts protocol/domain outbound items into transport-facing outbound items.
+pub trait SendConverter: Send + Sync + 'static {
+    type Input;
+    type Output;

-    async fn send(&mut self, item: Result<U, Status>) -> Result<(), Self::Error> {
-        self.response_sender.send(item).await
-    }
+    fn convert(&self, item: Self::Input) -> Self::Output;
 }

-/// Marker trait for transport actors that can receive outbound messages of type `T`.
-///
-/// Implement this on your transport actor to indicate it can handle outbound messages
-/// produced by the business actor. Requires the actor to implement [`Message<Result<T, E>>`]
-/// so business logic can forward responses via [`tell()`](ActorRef::tell).
-///
-/// # Example
-///
-/// ```rust,ignore
-/// #[derive(Actor)]
-/// struct MyTransportActor { /* ... */ }
-///
-/// impl Message<Result<MyResponse, MyError>> for MyTransportActor {
-///     type Reply = ();
-///     async fn handle(&mut self, msg: Result<MyResponse, MyError>, _ctx: &mut Context<Self, Self::Reply>) -> Self::Reply {
-///         // forward outbound message to channel/socket
-///     }
-/// }
-///
-/// impl TransportActor<MyResponse, MyError> for MyTransportActor {}
-/// ```
-pub trait TransportActor<Outbound: Send + 'static, DomainError: Send + 'static>:
-    Actor + Send + Message<Result<Outbound, DomainError>>
-{
+/// A [`RecvConverter`] that forwards values unchanged.
+pub struct IdentityRecvConverter<T> {
+    _marker: PhantomData<T>,
 }

-/// A kameo actor that bridges a gRPC bidirectional stream with a business logic actor.
-///
-/// This actor owns the gRPC [`Streaming`] receiver and an [`mpsc::Sender`] for responses.
-/// It multiplexes between its own mailbox (for outbound messages from the business actor)
-/// and the gRPC stream (for inbound client messages) using [`tokio::select!`].
-///
-/// # Message Flow
-///
-/// - **Inbound**: Messages from the gRPC stream are forwarded to `business_logic_actor`
-///   via [`tell()`](Recipient::tell).
-/// - **Outbound**: The business actor sends `Result<Outbound, DomainError>` messages to this
-///   actor, which forwards them through the `sender` channel to the gRPC response stream.
-///
-/// # Lifecycle
-///
-/// - If the business logic actor dies (detected via actor linking), this actor stops,
-///   which closes the gRPC stream.
-/// - If the gRPC stream closes or errors, this actor stops, which (via linking) notifies
-///   the business actor.
-/// - Error responses (`Err(DomainError)`) are forwarded to the client and then the actor stops,
-///   closing the connection.
-///
-/// # Type Parameters
-/// - `Outbound`: `OutboundMessage` sent to the client (e.g., `UserAgentResponse`)
-/// - `Inbound`: `InboundMessage` received from the client (e.g., `UserAgentRequest`)
-/// - `E`: The domain error type, must implement `Into<tonic::Status>` for gRPC conversion
-pub struct GrpcTransportActor<Outbound, Inbound, DomainError>
-where
-    Outbound: Send + 'static,
-    Inbound: Send + 'static,
-    DomainError: Into<tonic::Status> + Send + 'static,
-{
-    sender: mpsc::Sender<Result<Outbound, tonic::Status>>,
-    receiver: tonic::Streaming<Inbound>,
-    business_logic_actor: Recipient<Inbound>,
-    _error: std::marker::PhantomData<DomainError>,
-}
-
-impl<Outbound, Inbound, DomainError> GrpcTransportActor<Outbound, Inbound, DomainError>
-where
-    Outbound: Send + 'static,
-    Inbound: Send + 'static,
-    DomainError: Into<tonic::Status> + Send + 'static,
-{
-    pub fn new(
-        sender: mpsc::Sender<Result<Outbound, tonic::Status>>,
-        receiver: tonic::Streaming<Inbound>,
-        business_logic_actor: Recipient<Inbound>,
-    ) -> Self {
+impl<T> IdentityRecvConverter<T> {
+    pub fn new() -> Self {
        Self {
-            sender,
-            receiver,
-            business_logic_actor,
-            _error: std::marker::PhantomData,
+            _marker: PhantomData,
        }
    }
 }

-impl<Outbound, Inbound, E> Actor for GrpcTransportActor<Outbound, Inbound, E>
+impl<T> Default for IdentityRecvConverter<T> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<T> RecvConverter for IdentityRecvConverter<T>
 where
-    Outbound: Send + 'static,
-    Inbound: Send + 'static,
-    E: Into<tonic::Status> + Send + 'static,
+    T: Send + Sync + 'static,
 {
-    type Args = Self;
+    type Input = T;
+    type Output = T;

-    type Error = ();
+    fn convert(&self, item: Self::Input) -> Self::Output {
+        item
+    }
+}

-    async fn on_start(args: Self::Args, _: ActorRef<Self>) -> Result<Self, Self::Error> {
-        Ok(args)
+/// A [`SendConverter`] that forwards values unchanged.
+pub struct IdentitySendConverter<T> {
+    _marker: PhantomData<T>,
+}
+
+impl<T> IdentitySendConverter<T> {
+    pub fn new() -> Self {
+        Self {
+            _marker: PhantomData,
+        }
+    }
+}
+
+impl<T> Default for IdentitySendConverter<T> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<T> SendConverter for IdentitySendConverter<T>
+where
+    T: Send + Sync + 'static,
+{
+    type Input = T;
+    type Output = T;
+
+    fn convert(&self, item: Self::Input) -> Self::Output {
+        item
+    }
+}
+
+/// gRPC-specific transport adapters and helpers.
+pub mod grpc {
+    use async_trait::async_trait;
+    use futures::StreamExt;
+    use tokio::sync::mpsc;
+    use tonic::Streaming;
+
+    use super::{Bi, Error, RecvConverter, SendConverter};
+
+    /// [`Bi`] adapter backed by a tonic gRPC bidirectional stream.
+    ///
+
+    /// Tonic receive errors are logged and treated as stream closure (`None`).
+    /// The receive converter is only invoked for successful inbound transport
+    /// items.
+    pub struct GrpcAdapter<InboundConverter, OutboundConverter>
+    where
+        InboundConverter: RecvConverter,
+        OutboundConverter: SendConverter,
+    {
+        sender: mpsc::Sender<OutboundConverter::Output>,
+        receiver: Streaming<InboundConverter::Input>,
+        inbound_converter: InboundConverter,
+        outbound_converter: OutboundConverter,
    }

-    fn on_link_died(
-        &mut self,
-        _: WeakActorRef<Self>,
-        id: kameo::prelude::ActorId,
-        _: kameo::prelude::ActorStopReason,
-    ) -> impl Future<
-        Output = Result<std::ops::ControlFlow<kameo::prelude::ActorStopReason>, Self::Error>,
-    > + Send {
-        async move {
-            if id == self.business_logic_actor.id() {
-                error!("Business logic actor died, stopping GrpcTransportActor");
-                Ok(std::ops::ControlFlow::Break(
-                    kameo::prelude::ActorStopReason::Normal,
-                ))
-            } else {
-                debug!(
-                    "Linked actor {} died, but it's not the business logic actor, ignoring",
-                    id
-                );
-                Ok(std::ops::ControlFlow::Continue(()))
+    impl<InboundTransport, Inbound, InboundConverter, OutboundConverter>
+        GrpcAdapter<InboundConverter, OutboundConverter>
+    where
+        InboundConverter: RecvConverter<Input = InboundTransport, Output = Inbound>,
+        OutboundConverter: SendConverter,
+    {
+        pub fn new(
+            sender: mpsc::Sender<OutboundConverter::Output>,
+            receiver: Streaming<InboundTransport>,
+            inbound_converter: InboundConverter,
+            outbound_converter: OutboundConverter,
+        ) -> Self {
+            Self {
+                sender,
+                receiver,
+                inbound_converter,
+                outbound_converter,
            }
        }
    }

-    async fn next(
-        &mut self,
-        _: WeakActorRef<Self>,
-        mailbox_rx: &mut kameo::prelude::MailboxReceiver<Self>,
-    ) -> Option<kameo::mailbox::Signal<Self>> {
-        select! {
-            msg = mailbox_rx.recv() => {
-                msg
-            }
-            recv_msg = self.receiver.next() => {
-                match recv_msg {
-                    Some(Ok(msg)) => {
-                        match self.business_logic_actor.tell(msg).await {
-                            Ok(_) => None,
-                            Err(e) => {
-                                // TODO: this would probably require better error handling - or resending if backpressure is the issue
-                                error!("Failed to send message to business logic actor: {}", e);
-                                Some(Signal::Stop)
-                            }
-                        }
-                    }
-                    Some(Err(e)) => {
-                        error!("Received error from stream: {}, stopping GrpcTransportActor", e);
-                        Some(Signal::Stop)
-                    }
-                    None => {
-                        error!("Receiver channel closed, stopping GrpcTransportActor");
-                        Some(Signal::Stop)
-                    }
+    #[async_trait]
+    impl<InboundConverter, OutboundConverter> Bi<InboundConverter::Output, OutboundConverter::Input>
+        for GrpcAdapter<InboundConverter, OutboundConverter>
+    where
+        InboundConverter: RecvConverter,
+        OutboundConverter: SendConverter,
+        OutboundConverter::Input: Send + 'static,
+        OutboundConverter::Output: Send + 'static,
+    {
+        #[tracing::instrument(level = "trace", skip(self, item))]
+        async fn send(&mut self, item: OutboundConverter::Input) -> Result<(), Error> {
+            let outbound = self.outbound_converter.convert(item);
+            self.sender
+                .send(outbound)
+                .await
+                .map_err(|_| Error::ChannelClosed)
+        }
+
+        #[tracing::instrument(level = "trace", skip(self))]
+        async fn recv(&mut self) -> Option<InboundConverter::Output> {
+            match self.receiver.next().await {
+                Some(Ok(item)) => Some(self.inbound_converter.convert(item)),
+                Some(Err(error)) => {
+                    tracing::error!(error = ?error, "grpc transport recv failed; closing stream");
+                    None
                }
+                None => None,
            }
        }
    }
 }

-impl<Outbound, Inbound, E> Message<Result<Outbound, E>> for GrpcTransportActor<Outbound, Inbound, E>
-where
-    Outbound: Send + 'static,
-    Inbound: Send + 'static,
-    E: Into<tonic::Status> + Send + 'static,
-{
-    type Reply = ();
+/// No-op [`Bi`] transport for tests and manual actor usage.
+///
+/// `send` drops all items and succeeds. [`Bi::recv`] never resolves and therefore
+/// does not busy-wait or spuriously close the stream.
+pub struct DummyTransport<Inbound, Outbound> {
+    _marker: PhantomData<(Inbound, Outbound)>,
+}

-    async fn handle(
-        &mut self,
-        msg: Result<Outbound, E>,
-        ctx: &mut kameo::prelude::Context<Self, Self::Reply>,
-    ) -> Self::Reply {
-        let is_err = msg.is_err();
-        let grpc_msg = msg.map_err(Into::into);
-        match self.sender.send(grpc_msg).await {
-            Ok(_) => {
-                if is_err {
-                    ctx.stop();
-                }
-            }
-            Err(e) => {
-                error!("Failed to send message: {}", e);
-                ctx.stop();
-            }
+impl<Inbound, Outbound> DummyTransport<Inbound, Outbound> {
+    pub fn new() -> Self {
+        Self {
+            _marker: PhantomData,
        }
    }
 }

-impl<Outbound, Inbound, E> TransportActor<Outbound, E> for GrpcTransportActor<Outbound, Inbound, E>
-where
-    Outbound: Send + 'static,
-    Inbound: Send + 'static,
-    E: Into<tonic::Status> + Send + 'static,
-{
+impl<Inbound, Outbound> Default for DummyTransport<Inbound, Outbound> {
+    fn default() -> Self {
+        Self::new()
+    }
 }

-/// Wires together a transport actor and a business logic actor with bidirectional linking.
-///
-/// This function handles the chicken-and-egg problem of two actors that need references
-/// to each other at construction time. It uses kameo's [`PreparedActor`] to obtain
-/// [`ActorRef`]s before spawning, then links both actors so that if either dies,
-/// the other is notified via [`on_link_died`](Actor::on_link_died).
-///
-/// The business actor receives a type-erased [`Recipient<Result<Outbound, DomainError>>`] instead of an
-/// `ActorRef<Transport>`, keeping it decoupled from the concrete transport implementation.
-///
-/// # Type Parameters
-/// - `Transport`: The transport actor type (e.g., [`GrpcTransportActor`])
-/// - `Inbound`: `InboundMessage` received by the business actor from the transport
-/// - `Outbound`: `OutboundMessage` sent by the business actor back to the transport
-/// - `Business`: The business logic actor
-/// - `BusinessCtor`: Closure that receives a prepared business actor and transport recipient,
-///   spawns the business actor, and returns its [`ActorRef`]
-/// - `TransportCtor`: Closure that receives a prepared transport actor, a recipient for
-///   inbound messages, and the business actor id, then spawns the transport actor
-///
-/// # Returns
-/// A tuple of `(transport_ref, business_ref)` — actor references for both spawned actors.
-pub async fn wire<
-    Transport,
-    Inbound,
-    Outbound,
-    DomainError,
-    Business,
-    BusinessCtor,
-    TransportCtor,
->(
-    business_ctor: BusinessCtor,
-    transport_ctor: TransportCtor,
-) -> (ActorRef<Transport>, ActorRef<Business>)
+#[async_trait]
+impl<Inbound, Outbound> Bi<Inbound, Outbound> for DummyTransport<Inbound, Outbound>
 where
-    Transport: TransportActor<Outbound, DomainError>,
-    Inbound: Send + 'static,
-    Outbound: Send + 'static,
-    DomainError: Send + 'static,
-    Business: Actor + Message<Inbound> + Send + 'static,
-    BusinessCtor: FnOnce(PreparedActor<Business>, Recipient<Result<Outbound, DomainError>>),
-    TransportCtor:
-        FnOnce(PreparedActor<Transport>, Recipient<Inbound>),
+    Inbound: Send + Sync + 'static,
+    Outbound: Send + Sync + 'static,
 {
-    let prepared_business: PreparedActor<Business> = Spawn::prepare();
-    let prepared_transport: PreparedActor<Transport> = Spawn::prepare();
+    async fn send(&mut self, _item: Outbound) -> Result<(), Error> {
+        Ok(())
+    }

-    let business_ref = prepared_business.actor_ref().clone();
-    let transport_ref = prepared_transport.actor_ref().clone();
-
-    transport_ref.link(&business_ref).await;
-    business_ref.link(&transport_ref).await;
-
-    let recipient = transport_ref.clone().recipient();
-    business_ctor(prepared_business, recipient);
-    let business_recipient = business_ref.clone().recipient();
-    transport_ctor(prepared_transport, business_recipient);
-
-
-    (transport_ref, business_ref)
+    async fn recv(&mut self) -> Option<Inbound> {
+        std::future::pending::<()>().await;
+        None
+    }
 }
--- a/server/crates/arbiter-server/src/.DS_Store
+++ b/server/crates/arbiter-server/src/.DS_Store
--- a/server/crates/arbiter-server/src/actors/client.rs
+++ b/server/crates/arbiter-server/src/actors/client.rs
@@ -1,12 +0,0 @@
-use arbiter_proto::{
-    proto::{ClientRequest, ClientResponse},
-    transport::Bi,
-};
-
-use crate::ServerContext;
-
-pub(crate) async fn handle_client(
-    _context: ServerContext,
-    _bistream: impl Bi<ClientRequest, ClientResponse>,
-) {
-}
--- a/server/crates/arbiter-server/src/actors/client/auth/mod.rs
+++ b/server/crates/arbiter-server/src/actors/client/auth/mod.rs
@@ -0,0 +1,101 @@
+use arbiter_proto::proto::client::{
+    AuthChallengeRequest, AuthChallengeSolution, ClientRequest,
+    client_request::Payload as ClientRequestPayload,
+};
+use ed25519_dalek::VerifyingKey;
+use tracing::error;
+
+use crate::actors::client::{
+    ClientConnection,
+    auth::state::{AuthContext, AuthStateMachine},
+    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")]
+    DatabaseOperationFailed,
+    #[error("Public key not registered")]
+    PublicKeyNotRegistered,
+    #[error("Invalid signature length")]
+    InvalidSignatureLength,
+    #[error("Invalid challenge solution")]
+    InvalidChallengeSolution,
+    #[error("Transport error")]
+    Transport,
+}
+
+mod state;
+use state::*;
+
+fn parse_auth_event(payload: ClientRequestPayload) -> Result<AuthEvents, Error> {
+    match payload {
+        ClientRequestPayload::AuthChallengeRequest(AuthChallengeRequest { pubkey }) => {
+            let pubkey_bytes = pubkey.as_array().ok_or(Error::InvalidClientPubkeyLength)?;
+            let pubkey = VerifyingKey::from_bytes(pubkey_bytes)
+                .map_err(|_| Error::InvalidAuthPubkeyEncoding)?;
+            Ok(AuthEvents::AuthRequest(ChallengeRequest {
+                pubkey: pubkey.into(),
+            }))
+        }
+        ClientRequestPayload::AuthChallengeSolution(AuthChallengeSolution { signature }) => {
+            Ok(AuthEvents::ReceivedSolution(ChallengeSolution {
+                solution: signature,
+            }))
+        }
+    }
+}
+
+pub async fn authenticate(props: &mut ClientConnection) -> Result<VerifyingKey, Error> {
+    let mut state = AuthStateMachine::new(AuthContext::new(props));
+
+    loop {
+        let transport = state.context_mut().conn.transport.as_mut();
+        let Some(ClientRequest {
+            payload: Some(payload),
+        }) = transport.recv().await
+        else {
+            return Err(Error::Transport);
+        };
+
+        let event = parse_auth_event(payload)?;
+
+        match state.process_event(event).await {
+            Ok(AuthStates::AuthOk(key)) => return Ok(key.clone()),
+            Err(AuthError::ActionFailed(err)) => {
+                error!(?err, "State machine action failed");
+                return Err(err);
+            }
+            Err(AuthError::GuardFailed(err)) => {
+                error!(?err, "State machine guard failed");
+                return Err(err);
+            }
+            Err(AuthError::InvalidEvent) => {
+                error!("Invalid event for current state");
+                return Err(Error::InvalidChallengeSolution);
+            }
+            Err(AuthError::TransitionsFailed) => {
+                error!("Invalid state transition");
+                return Err(Error::InvalidChallengeSolution);
+            }
+
+            _ => (),
+        }
+    }
+}
+
+pub async fn authenticate_and_create(
+    mut props: ClientConnection,
+) -> Result<ClientSession, Error> {
+    let key = authenticate(&mut props).await?;
+    let session = ClientSession::new(props, key);
+    Ok(session)
+}
--- a/server/crates/arbiter-server/src/actors/client/auth/state.rs
+++ b/server/crates/arbiter-server/src/actors/client/auth/state.rs
@@ -0,0 +1,136 @@
+use arbiter_proto::proto::client::{
+    AuthChallenge, ClientResponse,
+    client_response::Payload as ClientResponsePayload,
+};
+use diesel::{ExpressionMethods as _, OptionalExtension as _, QueryDsl, update};
+use diesel_async::RunQueryDsl;
+use ed25519_dalek::VerifyingKey;
+use tracing::error;
+
+use super::Error;
+use crate::{actors::client::ClientConnection, db::schema};
+
+pub struct ChallengeRequest {
+    pub pubkey: VerifyingKey,
+}
+
+pub struct ChallengeContext {
+    pub challenge: AuthChallenge,
+    pub key: VerifyingKey,
+}
+
+pub struct ChallengeSolution {
+    pub solution: Vec<u8>,
+}
+
+smlang::statemachine!(
+    name: Auth,
+    custom_error: true,
+    transitions: {
+        *Init + AuthRequest(ChallengeRequest) / async prepare_challenge = SentChallenge(ChallengeContext),
+        SentChallenge(ChallengeContext) + ReceivedSolution(ChallengeSolution) [async verify_solution] / provide_key = AuthOk(VerifyingKey),
+    }
+);
+
+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
+    })?;
+    db_conn
+        .exclusive_transaction(|conn| {
+            Box::pin(async move {
+                let current_nonce = schema::program_client::table
+                    .filter(schema::program_client::public_key.eq(pubkey_bytes.to_vec()))
+                    .select(schema::program_client::nonce)
+                    .first::<i32>(conn)
+                    .await?;
+
+                update(schema::program_client::table)
+                    .filter(schema::program_client::public_key.eq(pubkey_bytes.to_vec()))
+                    .set(schema::program_client::nonce.eq(current_nonce + 1))
+                    .execute(conn)
+                    .await?;
+
+                Result::<_, diesel::result::Error>::Ok(current_nonce)
+            })
+        })
+        .await
+        .optional()
+        .map_err(|e| {
+            error!(error = ?e, "Database error");
+            Error::DatabaseOperationFailed
+        })?
+        .ok_or_else(|| {
+            error!(?pubkey_bytes, "Public key not found in database");
+            Error::PublicKeyNotRegistered
+        })
+}
+
+pub struct AuthContext<'a> {
+    pub(super) conn: &'a mut ClientConnection,
+}
+
+impl<'a> AuthContext<'a> {
+    pub fn new(conn: &'a mut ClientConnection) -> Self {
+        Self { conn }
+    }
+}
+
+impl AuthStateMachineContext for AuthContext<'_> {
+    type Error = Error;
+
+    async fn verify_solution(
+        &self,
+        ChallengeContext { challenge, key }: &ChallengeContext,
+        ChallengeSolution { solution }: &ChallengeSolution,
+    ) -> Result<bool, Self::Error> {
+        let formatted_challenge =
+            arbiter_proto::format_challenge(challenge.nonce, &challenge.pubkey);
+
+        let signature = solution.as_slice().try_into().map_err(|_| {
+            error!(?solution, "Invalid signature length");
+            Error::InvalidChallengeSolution
+        })?;
+
+        let valid = key.verify_strict(&formatted_challenge, &signature).is_ok();
+
+        Ok(valid)
+    }
+
+    async fn prepare_challenge(
+        &mut self,
+        ChallengeRequest { pubkey }: ChallengeRequest,
+    ) -> Result<ChallengeContext, Self::Error> {
+        let nonce = create_nonce(&self.conn.db, pubkey.as_bytes()).await?;
+
+        let challenge = AuthChallenge {
+            pubkey: pubkey.as_bytes().to_vec(),
+            nonce,
+        };
+
+        self.conn
+            .transport
+            .send(Ok(ClientResponse {
+                payload: Some(ClientResponsePayload::AuthChallenge(challenge.clone())),
+            }))
+            .await
+            .map_err(|e| {
+                error!(?e, "Failed to send auth challenge");
+                Error::Transport
+            })?;
+
+        Ok(ChallengeContext {
+            challenge,
+            key: pubkey,
+        })
+    }
+
+    fn provide_key(
+        &mut self,
+        state_data: &ChallengeContext,
+        _: ChallengeSolution,
+    ) -> Result<VerifyingKey, Self::Error> {
+        Ok(state_data.key)
+    }
+}
--- a/server/crates/arbiter-server/src/actors/client/mod.rs
+++ b/server/crates/arbiter-server/src/actors/client/mod.rs
@@ -0,0 +1,58 @@
+use arbiter_proto::{
+    proto::client::{ClientRequest, ClientResponse},
+    transport::Bi,
+};
+use kameo::actor::Spawn;
+use tracing::{error, info};
+
+use crate::{
+    actors::{GlobalActors, client::session::ClientSession},
+    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),
+}
+
+pub type Transport = Box<dyn Bi<ClientRequest, Result<ClientResponse, 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 {
+        Self {
+            db,
+            transport,
+            actors,
+        }
+    }
+}
+
+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);
+            info!("Client authenticated, session started");
+        }
+        Err(err) => {
+            error!(?err, "Authentication failed, closing connection");
+        }
+    }
+}
--- a/server/crates/arbiter-server/src/actors/client/session.rs
+++ b/server/crates/arbiter-server/src/actors/client/session.rs
@@ -0,0 +1,98 @@
+use arbiter_proto::proto::client::{ClientRequest, ClientResponse};
+use ed25519_dalek::VerifyingKey;
+use kameo::Actor;
+use tokio::select;
+use tracing::{error, info};
+
+use crate::{actors::{
+    GlobalActors, client::{ClientError, ClientConnection}, router::RegisterClient
+}, db};
+
+pub struct ClientSession {
+    props: ClientConnection,
+    key: VerifyingKey,
+}
+
+impl ClientSession {
+    pub(crate) fn new(props: ClientConnection, key: VerifyingKey) -> Self {
+        Self { props, key }
+    }
+
+    pub async fn process_transport_inbound(&mut self, req: ClientRequest) -> Output {
+        let msg = req.payload.ok_or_else(|| {
+            error!(actor = "client", "Received message with no payload");
+            ClientError::MissingRequestPayload
+        })?;
+
+        match msg {
+            _ => Err(ClientError::UnexpectedRequestPayload),
+        }
+    }
+}
+
+type Output = Result<ClientResponse, ClientError>;
+
+impl Actor for ClientSession {
+    type Args = Self;
+
+    type Error = ClientError;
+
+    async fn on_start(
+        args: Self::Args,
+        this: kameo::prelude::ActorRef<Self>,
+    ) -> Result<Self, Self::Error> {
+        args.props
+            .actors
+            .router
+            .ask(RegisterClient { actor: this })
+            .await
+            .map_err(|_| ClientError::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);
+        let key = VerifyingKey::from_bytes(&[0u8; 32]).unwrap();
+        Self { props, key }
+    }
+}
--- a/server/crates/arbiter-server/src/actors/mod.rs
+++ b/server/crates/arbiter-server/src/actors/mod.rs
@@ -3,14 +3,15 @@ use miette::Diagnostic;
 use thiserror::Error;

 use crate::{
-    actors::{bootstrap::Bootstrapper, keyholder::KeyHolder},
+    actors::{bootstrap::Bootstrapper, keyholder::KeyHolder, router::MessageRouter},
    db,
 };

 pub mod bootstrap;
-pub mod client;
+pub mod router;
 pub mod keyholder;
 pub mod user_agent;
+pub mod client;

 #[derive(Error, Debug, Diagnostic)]
 pub enum SpawnError {
@@ -28,6 +29,7 @@ pub enum SpawnError {
 pub struct GlobalActors {
    pub key_holder: ActorRef<KeyHolder>,
    pub bootstrapper: ActorRef<Bootstrapper>,
+    pub router: ActorRef<MessageRouter>,
 }

 impl GlobalActors {
@@ -35,6 +37,7 @@ impl GlobalActors {
        Ok(Self {
            bootstrapper: Bootstrapper::spawn(Bootstrapper::new(&db).await?),
            key_holder: KeyHolder::spawn(KeyHolder::new(db.clone()).await?),
+            router: MessageRouter::spawn(MessageRouter::default()),
        })
    }
 }
--- a/server/crates/arbiter-server/src/actors/router/mod.rs
+++ b/server/crates/arbiter-server/src/actors/router/mod.rs
@@ -0,0 +1,79 @@
+use std::{
+    collections::{HashMap},
+    ops::ControlFlow,
+};
+
+use kameo::{
+    Actor,
+    actor::{ActorId, ActorRef},
+    messages,
+    prelude::{ActorStopReason, Context, WeakActorRef},
+};
+use tracing::info;
+
+use crate::actors::{client::session::ClientSession, user_agent::session::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(()))
+    }
+}
+
+#[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);
+    }
+}
--- a/server/crates/arbiter-server/src/actors/user_agent/auth.rs
+++ b/server/crates/arbiter-server/src/actors/user_agent/auth.rs
@@ -0,0 +1,118 @@
+use arbiter_proto::proto::user_agent::{
+    AuthChallengeRequest, AuthChallengeSolution, UserAgentRequest,
+    user_agent_request::Payload as UserAgentRequestPayload,
+};
+use ed25519_dalek::VerifyingKey;
+use tracing::error;
+
+use crate::actors::user_agent::{
+    UserAgentConnection,
+    auth::state::{AuthContext, AuthStateMachine}, 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: UserAgentRequestPayload) -> Result<AuthEvents, Error> {
+    match payload {
+        UserAgentRequestPayload::AuthChallengeRequest(AuthChallengeRequest {
+            pubkey,
+            bootstrap_token: None,
+        }) => {
+            let pubkey_bytes = pubkey.as_array().ok_or(Error::InvalidClientPubkeyLength)?;
+            let pubkey = VerifyingKey::from_bytes(pubkey_bytes)
+                .map_err(|_| Error::InvalidAuthPubkeyEncoding)?;
+            Ok(AuthEvents::AuthRequest(ChallengeRequest {
+                pubkey: pubkey.into(),
+            }))
+        }
+        UserAgentRequestPayload::AuthChallengeRequest(AuthChallengeRequest {
+            pubkey,
+            bootstrap_token: Some(token),
+        }) => {
+            let pubkey_bytes = pubkey.as_array().ok_or(Error::InvalidClientPubkeyLength)?;
+            let pubkey = VerifyingKey::from_bytes(pubkey_bytes)
+                .map_err(|_| Error::InvalidAuthPubkeyEncoding)?;
+            Ok(AuthEvents::BootstrapAuthRequest(BootstrapAuthRequest {
+                pubkey: pubkey.into(),
+                token,
+            }))
+        }
+        UserAgentRequestPayload::AuthChallengeSolution(AuthChallengeSolution { signature }) => {
+            Ok(AuthEvents::ReceivedSolution(ChallengeSolution {
+                solution: signature,
+            }))
+        }
+        _ => Err(Error::UnexpectedMessagePayload),
+    }
+}
+
+pub async fn authenticate(props: &mut UserAgentConnection) -> Result<VerifyingKey, Error> {
+    let mut state = AuthStateMachine::new(AuthContext::new(props));
+
+    loop {
+        // This is needed because `state` now holds mutable reference to `ConnectionProps`, so we can't directly access `props` here
+        let transport = state.context_mut().conn.transport.as_mut();
+        let Some(UserAgentRequest {
+            payload: Some(payload),
+        }) = transport.recv().await
+        else {
+            return Err(Error::Transport);
+        };
+
+        let event = parse_auth_event(payload)?;
+
+        match state.process_event(event).await {
+            Ok(AuthStates::AuthOk(key)) => return Ok(key.clone()),
+            Err(AuthError::ActionFailed(err)) => {
+                error!(?err, "State machine action failed");
+                return Err(err);
+            }
+            Err(AuthError::GuardFailed(err)) => {
+                error!(?err, "State machine guard failed");
+                return Err(err);
+            }
+            Err(AuthError::InvalidEvent) => {
+                error!("Invalid event for current state");
+                return Err(Error::InvalidChallengeSolution);
+            }
+            Err(AuthError::TransitionsFailed) => {
+                error!("Invalid state transition");
+                return Err(Error::InvalidChallengeSolution);
+            }
+
+            _ => (),
+        }
+    }
+}
+
+
+pub async fn authenticate_and_create(mut props: UserAgentConnection) -> Result<UserAgentSession, Error> {
+    let key = authenticate(&mut props).await?;
+    let session = UserAgentSession::new(props, key.clone());
+    Ok(session)
+}
--- a/server/crates/arbiter-server/src/actors/user_agent/auth/state.rs
+++ b/server/crates/arbiter-server/src/actors/user_agent/auth/state.rs
@@ -0,0 +1,202 @@
+use arbiter_proto::proto::user_agent::{
+    AuthChallenge, UserAgentResponse,
+    user_agent_response::Payload as UserAgentResponsePayload,
+};
+use diesel::{ExpressionMethods as _, OptionalExtension as _, QueryDsl, update};
+use diesel_async::RunQueryDsl;
+use ed25519_dalek::VerifyingKey;
+use tracing::error;
+
+use super::Error;
+use crate::{
+    actors::{bootstrap::ConsumeToken, user_agent::UserAgentConnection},
+    db::schema,
+};
+
+pub struct ChallengeRequest {
+    pub pubkey: VerifyingKey,
+}
+
+pub struct BootstrapAuthRequest {
+    pub pubkey: VerifyingKey,
+    pub token: String,
+}
+
+pub struct ChallengeContext {
+    pub challenge: AuthChallenge,
+    pub key: VerifyingKey,
+}
+
+pub struct ChallengeSolution {
+    pub solution: Vec<u8>,
+}
+
+smlang::statemachine!(
+    name: Auth,
+    custom_error: true,
+    transitions: {
+        *Init + AuthRequest(ChallengeRequest) / async prepare_challenge = SentChallenge(ChallengeContext),
+        Init + BootstrapAuthRequest(BootstrapAuthRequest) [async verify_bootstrap_token] / provide_key_bootstrap = AuthOk(VerifyingKey),
+        SentChallenge(ChallengeContext) + ReceivedSolution(ChallengeSolution) [async verify_solution] / provide_key = AuthOk(VerifyingKey),
+    }
+);
+
+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
+    })?;
+    db_conn
+        .exclusive_transaction(|conn| {
+            Box::pin(async move {
+                let current_nonce = schema::useragent_client::table
+                    .filter(schema::useragent_client::public_key.eq(pubkey_bytes.to_vec()))
+                    .select(schema::useragent_client::nonce)
+                    .first::<i32>(conn)
+                    .await?;
+
+                update(schema::useragent_client::table)
+                    .filter(schema::useragent_client::public_key.eq(pubkey_bytes.to_vec()))
+                    .set(schema::useragent_client::nonce.eq(current_nonce + 1))
+                    .execute(conn)
+                    .await?;
+
+                Result::<_, diesel::result::Error>::Ok(current_nonce)
+            })
+        })
+        .await
+        .optional()
+        .map_err(|e| {
+            error!(error = ?e, "Database error");
+            Error::DatabaseOperationFailed
+        })?
+        .ok_or_else(|| {
+            error!(?pubkey_bytes, "Public key not found in database");
+            Error::PublicKeyNotRegistered
+        })
+}
+
+async fn register_key(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Result<(), Error> {
+    let mut conn = db.get().await.map_err(|e| {
+        error!(error = ?e, "Database pool error");
+        Error::DatabasePoolUnavailable
+    })?;
+
+    diesel::insert_into(schema::useragent_client::table)
+        .values((
+            schema::useragent_client::public_key.eq(pubkey_bytes.to_vec()),
+            schema::useragent_client::nonce.eq(1),
+        ))
+        .execute(&mut conn)
+        .await
+        .map_err(|e| {
+            error!(error = ?e, "Database error");
+            Error::DatabaseOperationFailed
+        })?;
+
+    Ok(())
+}
+
+pub struct AuthContext<'a> {
+    pub(super) conn: &'a mut UserAgentConnection,
+}
+
+impl<'a> AuthContext<'a> {
+    pub fn new(conn: &'a mut UserAgentConnection) -> Self {
+        Self { conn }
+    }
+}
+
+impl AuthStateMachineContext for AuthContext<'_> {
+    type Error = Error;
+
+    async fn verify_solution(
+        &self,
+        ChallengeContext { challenge, key }: &ChallengeContext,
+        ChallengeSolution { solution }: &ChallengeSolution,
+    ) -> Result<bool, Self::Error> {
+        let formatted_challenge =
+            arbiter_proto::format_challenge(challenge.nonce, &challenge.pubkey);
+
+        let signature = solution.as_slice().try_into().map_err(|_| {
+            error!(?solution, "Invalid signature length");
+            Error::InvalidChallengeSolution
+        })?;
+
+        let valid = key.verify_strict(&formatted_challenge, &signature).is_ok();
+
+        Ok(valid)
+    }
+
+    async fn prepare_challenge(
+        &mut self,
+        ChallengeRequest { pubkey }: ChallengeRequest,
+    ) -> Result<ChallengeContext, Self::Error> {
+        let nonce = create_nonce(&self.conn.db, pubkey.as_bytes()).await?;
+
+        let challenge = AuthChallenge {
+            pubkey: pubkey.as_bytes().to_vec(),
+            nonce,
+        };
+
+        self.conn
+            .transport
+            .send(Ok(UserAgentResponse {
+                payload: Some(UserAgentResponsePayload::AuthChallenge(challenge.clone())),
+            }))
+            .await
+            .map_err(|e| {
+                error!(?e, "Failed to send auth challenge");
+                Error::Transport
+            })?;
+
+        Ok(ChallengeContext {
+            challenge,
+            key: pubkey,
+        })
+    }
+
+    #[allow(missing_docs)]
+    #[allow(clippy::result_unit_err)]
+    async fn verify_bootstrap_token(
+        &self,
+        BootstrapAuthRequest { pubkey, token }: &BootstrapAuthRequest,
+    ) -> Result<bool, Self::Error> {
+        let token_ok: bool = self
+            .conn
+            .actors
+            .bootstrapper
+            .ask(ConsumeToken {
+                token: token.clone(),
+            })
+            .await
+            .map_err(|e| {
+                error!(?pubkey, "Failed to consume bootstrap token: {e}");
+                Error::BootstrapperActorUnreachable
+            })?;
+
+        if !token_ok {
+            error!(?pubkey, "Invalid bootstrap token provided");
+            return Err(Error::InvalidBootstrapToken);
+        }
+
+        register_key(&self.conn.db, pubkey.as_bytes()).await?;
+
+        Ok(true)
+    }
+
+    fn provide_key_bootstrap(
+        &mut self,
+        event_data: BootstrapAuthRequest,
+    ) -> Result<VerifyingKey, Self::Error> {
+        Ok(event_data.pubkey)
+    }
+
+    fn provide_key(
+        &mut self,
+        state_data: &ChallengeContext,
+        _: ChallengeSolution,
+    ) -> Result<VerifyingKey, Self::Error> {
+        Ok(state_data.key)
+    }
+}
--- a/server/crates/arbiter-server/src/actors/user_agent/error.rs
+++ b/server/crates/arbiter-server/src/actors/user_agent/error.rs
@@ -1,57 +0,0 @@
-use tonic::Status;
-
-use crate::db;
-
-#[derive(Debug, thiserror::Error)]
-pub enum UserAgentError {
-    #[error("Missing payload in request")]
-    MissingPayload,
-
-    #[error("Invalid bootstrap token")]
-    InvalidBootstrapToken,
-
-    #[error("Public key not registered")]
-    PubkeyNotRegistered,
-
-    #[error("Invalid public key format")]
-    InvalidPubkey,
-
-    #[error("Invalid signature length")]
-    InvalidSignatureLength,
-
-    #[error("Invalid challenge solution")]
-    InvalidChallengeSolution,
-
-    #[error("Invalid state for operation")]
-    InvalidState,
-
-    #[error("Actor unavailable")]
-    ActorUnavailable,
-
-    #[error("Database error")]
-    Database(#[from] diesel::result::Error),
-
-    #[error("Database pool error")]
-    DatabasePool(#[from] db::PoolError),
-}
-
-impl From<UserAgentError> for Status {
-    fn from(err: UserAgentError) -> Self {
-        match err {
-            UserAgentError::MissingPayload
-            | UserAgentError::InvalidBootstrapToken
-            | UserAgentError::InvalidPubkey
-            | UserAgentError::InvalidSignatureLength => Status::invalid_argument(err.to_string()),
-
-            UserAgentError::PubkeyNotRegistered | UserAgentError::InvalidChallengeSolution => {
-                Status::unauthenticated(err.to_string())
-            }
-
-            UserAgentError::InvalidState => Status::failed_precondition(err.to_string()),
-
-            UserAgentError::ActorUnavailable
-            | UserAgentError::Database(_)
-            | UserAgentError::DatabasePool(_) => Status::internal(err.to_string()),
-        }
-    }
-}
--- a/server/crates/arbiter-server/src/actors/user_agent/mod.rs
+++ b/server/crates/arbiter-server/src/actors/user_agent/mod.rs
@@ -1,401 +1,65 @@
-use std::{ops::DerefMut, sync::Mutex};
-
-use arbiter_proto::proto::{
-    UnsealEncryptedKey, UnsealResult, UnsealStart, UnsealStartResponse, UserAgentRequest,
-    UserAgentResponse,
-    auth::{
-        self, AuthChallengeRequest, AuthOk, ClientMessage as ClientAuthMessage,
-        ServerMessage as AuthServerMessage,
-        client_message::Payload as ClientAuthPayload,
-        server_message::Payload as ServerAuthPayload,
-    },
-    user_agent_request::Payload as UserAgentRequestPayload,
-    user_agent_response::Payload as UserAgentResponsePayload,
+use arbiter_proto::{
+    proto::user_agent::{UserAgentRequest, UserAgentResponse},
+    transport::Bi,
 };
-use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
-use diesel::{ExpressionMethods as _, OptionalExtension as _, QueryDsl, dsl::update};
-use diesel_async::RunQueryDsl;
-use ed25519_dalek::VerifyingKey;
-use kameo::{Actor, actor::Recipient, error::SendError, messages, prelude::Message};
-use memsafe::MemSafe;
+use kameo::actor::Spawn as _;
 use tracing::{error, info};
-use x25519_dalek::{EphemeralSecret, PublicKey};

 use crate::{
-    ServerContext,
-    actors::{
-        GlobalActors,
-        bootstrap::ConsumeToken,
-        keyholder::{self, TryUnseal},
-        user_agent::state::{
-            ChallengeContext, DummyContext, UnsealContext, UserAgentEvents, UserAgentStateMachine,
-            UserAgentStates,
-        },
-    },
-    db::{self, schema},
+    actors::{GlobalActors, user_agent::session::UserAgentSession},
+    db::{self},
 };

-mod error;
-mod state;
-
-pub use error::UserAgentError;
-
-#[derive(Actor)]
-pub struct UserAgentActor {
-    db: db::DatabasePool,
-    actors: GlobalActors,
-    state: UserAgentStateMachine<DummyContext>,
-    transport: Recipient<Result<UserAgentResponse, UserAgentError>>,
+#[derive(Debug, thiserror::Error, PartialEq)]
+pub enum UserAgentError {
+    #[error("Expected message with payload")]
+    MissingRequestPayload,
+    #[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,
 }

-impl UserAgentActor {
-    pub(crate) fn new(
-        context: ServerContext,
-        transport: Recipient<Result<UserAgentResponse, UserAgentError>>,
-    ) -> Self {
-        Self {
-            db: context.db.clone(),
-            actors: context.actors.clone(),
-            state: UserAgentStateMachine::new(DummyContext),
-            transport,
-        }
-    }
+pub type Transport =
+    Box<dyn Bi<UserAgentRequest, Result<UserAgentResponse, UserAgentError>> + Send>;

-    pub fn new_manual(
-        db: db::DatabasePool,
-        actors: GlobalActors,
-        transport: Recipient<Result<UserAgentResponse, UserAgentError>>,
-    ) -> Self {
+pub struct UserAgentConnection {
+    db: db::DatabasePool,
+    actors: GlobalActors,
+    transport: Transport,
+}
+
+impl UserAgentConnection {
+    pub fn new(db: db::DatabasePool, actors: GlobalActors, transport: Transport) -> Self {
        Self {
            db,
            actors,
-            state: UserAgentStateMachine::new(DummyContext),
            transport,
        }
    }
-
-    async fn process_request(&mut self, req: UserAgentRequest) -> Output {
-        let msg = req.payload.ok_or_else(|| {
-            error!(actor = "useragent", "Received message with no payload");
-            UserAgentError::MissingPayload
-        })?;
-
-        match msg {
-            UserAgentRequestPayload::AuthMessage(ClientAuthMessage {
-                payload: Some(ClientAuthPayload::AuthChallengeRequest(req)),
-            }) => self.handle_auth_challenge_request(req).await,
-            UserAgentRequestPayload::AuthMessage(ClientAuthMessage {
-                payload: Some(ClientAuthPayload::AuthChallengeSolution(solution)),
-            }) => self.handle_auth_challenge_solution(solution).await,
-            UserAgentRequestPayload::UnsealStart(unseal_start) => {
-                self.handle_unseal_request(unseal_start).await
-            }
-            UserAgentRequestPayload::UnsealEncryptedKey(unseal_encrypted_key) => {
-                self.handle_unseal_encrypted_key(unseal_encrypted_key).await
-            }
-            _ => Err(UserAgentError::MissingPayload),
-        }
-    }
-
-    fn transition(&mut self, event: UserAgentEvents) -> Result<(), UserAgentError> {
-        self.state.process_event(event).map_err(|e| {
-            error!(?e, "State transition failed");
-            UserAgentError::InvalidState
-        })?;
-        Ok(())
-    }
-
-    async fn auth_with_bootstrap_token(
-        &mut self,
-        pubkey: ed25519_dalek::VerifyingKey,
-        token: String,
-    ) -> Output {
-        let token_ok: bool = self
-            .actors
-            .bootstrapper
-            .ask(ConsumeToken { token })
-            .await
-            .map_err(|e| {
-                error!(?pubkey, "Failed to consume bootstrap token: {e}");
-                UserAgentError::ActorUnavailable
-            })?;
-
-        if !token_ok {
-            error!(?pubkey, "Invalid bootstrap token provided");
-            return Err(UserAgentError::InvalidBootstrapToken);
-        }
-
-        {
-            let mut conn = self.db.get().await?;
-
-            diesel::insert_into(schema::useragent_client::table)
-                .values((
-                    schema::useragent_client::public_key.eq(pubkey.as_bytes().to_vec()),
-                    schema::useragent_client::nonce.eq(1),
-                ))
-                .execute(&mut conn)
-                .await?;
-        }
-
-        self.transition(UserAgentEvents::ReceivedBootstrapToken)?;
-
-        Ok(auth_response(ServerAuthPayload::AuthOk(AuthOk {})))
-    }
-
-    async fn auth_with_challenge(&mut self, pubkey: VerifyingKey, pubkey_bytes: Vec<u8>) -> Output {
-        let nonce: Option<i32> = {
-            let mut db_conn = self.db.get().await?;
-            db_conn
-                .exclusive_transaction(|conn| {
-                    Box::pin(async move {
-                        let current_nonce = schema::useragent_client::table
-                            .filter(
-                                schema::useragent_client::public_key.eq(pubkey.as_bytes().to_vec()),
-                            )
-                            .select(schema::useragent_client::nonce)
-                            .first::<i32>(conn)
-                            .await?;
-
-                        update(schema::useragent_client::table)
-                            .filter(
-                                schema::useragent_client::public_key.eq(pubkey.as_bytes().to_vec()),
-                            )
-                            .set(schema::useragent_client::nonce.eq(current_nonce + 1))
-                            .execute(conn)
-                            .await?;
-
-                        Result::<_, diesel::result::Error>::Ok(current_nonce)
-                    })
-                })
-                .await
-                .optional()?
-        };
-
-        let Some(nonce) = nonce else {
-            error!(?pubkey, "Public key not found in database");
-            return Err(UserAgentError::PubkeyNotRegistered);
-        };
-
-        let challenge = auth::AuthChallenge {
-            pubkey: pubkey_bytes,
-            nonce,
-        };
-
-        self.transition(UserAgentEvents::SentChallenge(ChallengeContext {
-            challenge: challenge.clone(),
-            key: pubkey,
-        }))?;
-
-        info!(
-            ?pubkey,
-            ?challenge,
-            "Sent authentication challenge to client"
-        );
-
-        Ok(auth_response(ServerAuthPayload::AuthChallenge(challenge)))
-    }
-
-    fn verify_challenge_solution(
-        &self,
-        solution: &auth::AuthChallengeSolution,
-    ) -> Result<(bool, &ChallengeContext), UserAgentError> {
-        let UserAgentStates::WaitingForChallengeSolution(challenge_context) = self.state.state()
-        else {
-            error!("Received challenge solution in invalid state");
-            return Err(UserAgentError::InvalidState);
-        };
-        let formatted_challenge = arbiter_proto::format_challenge(&challenge_context.challenge);
-
-        let signature = solution.signature.as_slice().try_into().map_err(|_| {
-            error!(?solution, "Invalid signature length");
-            UserAgentError::InvalidSignatureLength
-        })?;
-
-        let valid = challenge_context
-            .key
-            .verify_strict(&formatted_challenge, &signature)
-            .is_ok();
-
-        Ok((valid, challenge_context))
-    }
 }

-type Output = Result<UserAgentResponse, UserAgentError>;
+pub mod auth;
+pub mod session;

-fn auth_response(payload: ServerAuthPayload) -> UserAgentResponse {
-    UserAgentResponse {
-        payload: Some(UserAgentResponsePayload::AuthMessage(AuthServerMessage {
-            payload: Some(payload),
-        })),
-    }
-}
-
-fn unseal_response(payload: UserAgentResponsePayload) -> UserAgentResponse {
-    UserAgentResponse {
-        payload: Some(payload),
-    }
-}
-
-#[messages]
-impl UserAgentActor {
-    #[message]
-    pub async fn handle_unseal_request(&mut self, req: UnsealStart) -> Output {
-        let secret = EphemeralSecret::random();
-        let public_key = PublicKey::from(&secret);
-
-        let client_pubkey_bytes: [u8; 32] = req
-            .client_pubkey
-            .try_into()
-            .map_err(|_| UserAgentError::InvalidPubkey)?;
-
-        let client_public_key = PublicKey::from(client_pubkey_bytes);
-
-        self.transition(UserAgentEvents::UnsealRequest(UnsealContext {
-            secret: Mutex::new(Some(secret)),
-            client_public_key,
-        }))?;
-
-        Ok(unseal_response(
-            UserAgentResponsePayload::UnsealStartResponse(UnsealStartResponse {
-                server_pubkey: public_key.as_bytes().to_vec(),
-            }),
-        ))
-    }
-
-    #[message]
-    pub async fn handle_unseal_encrypted_key(&mut self, req: UnsealEncryptedKey) -> Output {
-        let UserAgentStates::WaitingForUnsealKey(unseal_context) = self.state.state() else {
-            error!("Received unseal encrypted key in invalid state");
-            return Err(UserAgentError::InvalidState);
-        };
-        let ephemeral_secret = {
-            let mut secret_lock = unseal_context.secret.lock().unwrap();
-            let secret = secret_lock.take();
-            match secret {
-                Some(secret) => secret,
-                None => {
-                    drop(secret_lock);
-                    error!("Ephemeral secret already taken");
-                    self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                    return Ok(unseal_response(UserAgentResponsePayload::UnsealResult(
-                        UnsealResult::InvalidKey.into(),
-                    )));
-                }
-            }
-        };
-
-        let nonce = XNonce::from_slice(&req.nonce);
-
-        let shared_secret = ephemeral_secret.diffie_hellman(&unseal_context.client_public_key);
-        let cipher = XChaCha20Poly1305::new(shared_secret.as_bytes().into());
-
-        let mut seal_key_buffer = MemSafe::new(req.ciphertext.clone()).unwrap();
-
-        let decryption_result = {
-            let mut write_handle = seal_key_buffer.write().unwrap();
-            let write_handle = write_handle.deref_mut();
-            cipher.decrypt_in_place(nonce, &req.associated_data, write_handle)
-        };
-
-        match decryption_result {
-            Ok(_) => {
-                match self
-                    .actors
-                    .key_holder
-                    .ask(TryUnseal {
-                        seal_key_raw: seal_key_buffer,
-                    })
-                    .await
-                {
-                    Ok(_) => {
-                        info!("Successfully unsealed key with client-provided key");
-                        self.transition(UserAgentEvents::ReceivedValidKey)?;
-                        Ok(unseal_response(UserAgentResponsePayload::UnsealResult(
-                            UnsealResult::Success.into(),
-                        )))
-                    }
-                    Err(SendError::HandlerError(keyholder::Error::InvalidKey)) => {
-                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                        Ok(unseal_response(UserAgentResponsePayload::UnsealResult(
-                            UnsealResult::InvalidKey.into(),
-                        )))
-                    }
-                    Err(SendError::HandlerError(err)) => {
-                        error!(?err, "Keyholder failed to unseal key");
-                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                        Ok(unseal_response(UserAgentResponsePayload::UnsealResult(
-                            UnsealResult::InvalidKey.into(),
-                        )))
-                    }
-                    Err(err) => {
-                        error!(?err, "Failed to send unseal request to keyholder");
-                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                        Err(UserAgentError::ActorUnavailable)
-                    }
-                }
-            }
-            Err(err) => {
-                error!(?err, "Failed to decrypt unseal key");
-                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
-                Ok(unseal_response(UserAgentResponsePayload::UnsealResult(
-                    UnsealResult::InvalidKey.into(),
-                )))
-            }
+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");
        }
-    }
-
-    #[message]
-    pub async fn handle_auth_challenge_request(&mut self, req: AuthChallengeRequest) -> Output {
-        let pubkey = req
-            .pubkey
-            .as_array()
-            .ok_or(UserAgentError::InvalidPubkey)?;
-        let pubkey = VerifyingKey::from_bytes(pubkey).map_err(|_err| {
-            error!(?pubkey, "Failed to convert to VerifyingKey");
-            UserAgentError::InvalidPubkey
-        })?;
-
-        self.transition(UserAgentEvents::AuthRequest)?;
-
-        match req.bootstrap_token {
-            Some(token) => self.auth_with_bootstrap_token(pubkey, token).await,
-            None => self.auth_with_challenge(pubkey, req.pubkey).await,
-        }
-    }
-
-    #[message]
-    pub async fn handle_auth_challenge_solution(
-        &mut self,
-        solution: auth::AuthChallengeSolution,
-    ) -> Output {
-        let (valid, challenge_context) = self.verify_challenge_solution(&solution)?;
-
-        if valid {
-            info!(
-                ?challenge_context,
-                "Client provided valid solution to authentication challenge"
-            );
-            self.transition(UserAgentEvents::ReceivedGoodSolution)?;
-            Ok(auth_response(ServerAuthPayload::AuthOk(AuthOk {})))
-        } else {
-            error!("Client provided invalid solution to authentication challenge");
-            self.transition(UserAgentEvents::ReceivedBadSolution)?;
-            Err(UserAgentError::InvalidChallengeSolution)
-        }
-    }
-}
-
-impl Message<UserAgentRequest> for UserAgentActor {
-    type Reply = ();
-
-    async fn handle(
-        &mut self,
-        msg: UserAgentRequest,
-        _ctx: &mut kameo::prelude::Context<Self, Self::Reply>,
-    ) -> Self::Reply {
-        let result = self.process_request(msg).await;
-        if let Err(e) = self.transport.tell(result).await {
-            error!(actor = "useragent", "Failed to send response to transport: {}", e);
+        Err(err) => {
+            error!(?err, "Authentication failed, closing connection");
        }
    }
 }
--- a/server/crates/arbiter-server/src/actors/user_agent/session.rs
+++ b/server/crates/arbiter-server/src/actors/user_agent/session.rs
@@ -0,0 +1,253 @@
+use std::{ops::DerefMut, sync::Mutex};
+
+use arbiter_proto::proto::user_agent::{
+    UnsealEncryptedKey, UnsealResult, UnsealStart, UnsealStartResponse, UserAgentRequest,
+    UserAgentResponse, user_agent_request::Payload as UserAgentRequestPayload,
+    user_agent_response::Payload as UserAgentResponsePayload,
+};
+use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
+use ed25519_dalek::VerifyingKey;
+use kameo::{Actor, error::SendError};
+use memsafe::MemSafe;
+use tokio::select;
+use tracing::{error, info};
+use x25519_dalek::{EphemeralSecret, PublicKey};
+
+use crate::actors::{
+    keyholder::{self, TryUnseal},
+    router::RegisterUserAgent,
+    user_agent::{UserAgentConnection, UserAgentError},
+};
+
+mod state;
+use state::{DummyContext, UnsealContext, UserAgentEvents, UserAgentStateMachine, UserAgentStates};
+
+pub struct UserAgentSession {
+    props: UserAgentConnection,
+    key: VerifyingKey,
+    state: UserAgentStateMachine<DummyContext>,
+}
+
+impl UserAgentSession {
+    pub(crate) fn new(props: UserAgentConnection, key: VerifyingKey) -> Self {
+        Self {
+            props,
+            key,
+            state: UserAgentStateMachine::new(DummyContext),
+        }
+    }
+
+    fn transition(&mut self, event: UserAgentEvents) -> Result<(), UserAgentError> {
+        self.state.process_event(event).map_err(|e| {
+            error!(?e, "State transition failed");
+            UserAgentError::StateTransitionFailed
+        })?;
+        Ok(())
+    }
+
+    pub async fn process_transport_inbound(&mut self, req: UserAgentRequest) -> Output {
+        let msg = req.payload.ok_or_else(|| {
+            error!(actor = "useragent", "Received message with no payload");
+            UserAgentError::MissingRequestPayload
+        })?;
+
+        match msg {
+            UserAgentRequestPayload::UnsealStart(unseal_start) => {
+                self.handle_unseal_request(unseal_start).await
+            }
+            UserAgentRequestPayload::UnsealEncryptedKey(unseal_encrypted_key) => {
+                self.handle_unseal_encrypted_key(unseal_encrypted_key).await
+            }
+            _ => Err(UserAgentError::UnexpectedRequestPayload),
+        }
+    }
+}
+
+type Output = Result<UserAgentResponse, UserAgentError>;
+
+fn response(payload: UserAgentResponsePayload) -> UserAgentResponse {
+    UserAgentResponse {
+        payload: Some(payload),
+    }
+}
+
+impl UserAgentSession {
+    async fn handle_unseal_request(&mut self, req: UnsealStart) -> Output {
+        let secret = EphemeralSecret::random();
+        let public_key = PublicKey::from(&secret);
+
+        let client_pubkey_bytes: [u8; 32] = req
+            .client_pubkey
+            .try_into()
+            .map_err(|_| UserAgentError::InvalidClientPubkeyLength)?;
+
+        let client_public_key = PublicKey::from(client_pubkey_bytes);
+
+        self.transition(UserAgentEvents::UnsealRequest(UnsealContext {
+            secret: Mutex::new(Some(secret)),
+            client_public_key,
+        }))?;
+
+        Ok(response(UserAgentResponsePayload::UnsealStartResponse(
+            UnsealStartResponse {
+                server_pubkey: public_key.as_bytes().to_vec(),
+            },
+        )))
+    }
+
+    async fn handle_unseal_encrypted_key(&mut self, req: UnsealEncryptedKey) -> Output {
+        let UserAgentStates::WaitingForUnsealKey(unseal_context) = self.state.state() else {
+            error!("Received unseal encrypted key in invalid state");
+            return Err(UserAgentError::InvalidStateForUnsealEncryptedKey);
+        };
+        let ephemeral_secret = {
+            let mut secret_lock = unseal_context.secret.lock().unwrap();
+            let secret = secret_lock.take();
+            match secret {
+                Some(secret) => secret,
+                None => {
+                    drop(secret_lock);
+                    error!("Ephemeral secret already taken");
+                    self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                    return Ok(response(UserAgentResponsePayload::UnsealResult(
+                        UnsealResult::InvalidKey.into(),
+                    )));
+                }
+            }
+        };
+
+        let nonce = XNonce::from_slice(&req.nonce);
+
+        let shared_secret = ephemeral_secret.diffie_hellman(&unseal_context.client_public_key);
+        let cipher = XChaCha20Poly1305::new(shared_secret.as_bytes().into());
+
+        let mut seal_key_buffer = MemSafe::new(req.ciphertext.clone()).unwrap();
+
+        let decryption_result = {
+            let mut write_handle = seal_key_buffer.write().unwrap();
+            let write_handle = write_handle.deref_mut();
+            cipher.decrypt_in_place(nonce, &req.associated_data, write_handle)
+        };
+
+        match decryption_result {
+            Ok(_) => {
+                match self
+                    .props
+                    .actors
+                    .key_holder
+                    .ask(TryUnseal {
+                        seal_key_raw: seal_key_buffer,
+                    })
+                    .await
+                {
+                    Ok(_) => {
+                        info!("Successfully unsealed key with client-provided key");
+                        self.transition(UserAgentEvents::ReceivedValidKey)?;
+                        Ok(response(UserAgentResponsePayload::UnsealResult(
+                            UnsealResult::Success.into(),
+                        )))
+                    }
+                    Err(SendError::HandlerError(keyholder::Error::InvalidKey)) => {
+                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                        Ok(response(UserAgentResponsePayload::UnsealResult(
+                            UnsealResult::InvalidKey.into(),
+                        )))
+                    }
+                    Err(SendError::HandlerError(err)) => {
+                        error!(?err, "Keyholder failed to unseal key");
+                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                        Ok(response(UserAgentResponsePayload::UnsealResult(
+                            UnsealResult::InvalidKey.into(),
+                        )))
+                    }
+                    Err(err) => {
+                        error!(?err, "Failed to send unseal request to keyholder");
+                        self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                        Err(UserAgentError::KeyHolderActorUnreachable)
+                    }
+                }
+            }
+            Err(err) => {
+                error!(?err, "Failed to decrypt unseal key");
+                self.transition(UserAgentEvents::ReceivedInvalidKey)?;
+                Ok(response(UserAgentResponsePayload::UnsealResult(
+                    UnsealResult::InvalidKey.into(),
+                )))
+            }
+        }
+    }
+}
+
+impl Actor for UserAgentSession {
+    type Args = Self;
+
+    type Error = UserAgentError;
+
+    async fn on_start(
+        args: Self::Args,
+        this: kameo::prelude::ActorRef<Self>,
+    ) -> Result<Self, Self::Error> {
+        args.props
+            .actors
+            .router
+            .ask(RegisterUserAgent {
+                actor: this.clone(),
+            })
+            .await
+            .map_err(|err| {
+                error!(?err, "Failed to register user agent connection with router");
+                UserAgentError::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(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);
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+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);
+        let key = VerifyingKey::from_bytes(&[0u8; 32]).unwrap();
+        Self {
+            props,
+            key,
+            state: UserAgentStateMachine::new(DummyContext),
+        }
+    }
+}
--- a/server/crates/arbiter-server/src/actors/user_agent/session/state.rs
+++ b/server/crates/arbiter-server/src/actors/user_agent/session/state.rs
@@ -0,0 +1,27 @@
+use std::sync::Mutex;
+
+use x25519_dalek::{EphemeralSecret, PublicKey};
+
+pub struct UnsealContext {
+    pub client_public_key: PublicKey,
+    pub secret: Mutex<Option<EphemeralSecret>>,
+}
+
+smlang::statemachine!(
+    name: UserAgent,
+    custom_error: false,
+    transitions: {
+        *Idle + UnsealRequest(UnsealContext) / generate_temp_keypair = WaitingForUnsealKey(UnsealContext),
+        WaitingForUnsealKey(UnsealContext) + ReceivedValidKey = Unsealed,
+        WaitingForUnsealKey(UnsealContext) + ReceivedInvalidKey = Idle,
+    }
+);
+
+pub struct DummyContext;
+impl UserAgentStateMachineContext for DummyContext {
+    #[allow(missing_docs)]
+    #[allow(clippy::unused_unit)]
+    fn generate_temp_keypair(&mut self, event_data: UnsealContext) -> Result<UnsealContext, ()> {
+        Ok(event_data)
+    }
+}
--- a/server/crates/arbiter-server/src/actors/user_agent/state.rs
+++ b/server/crates/arbiter-server/src/actors/user_agent/state.rs
@@ -1,51 +0,0 @@
-use std::sync::Mutex;
-
-use arbiter_proto::proto::auth::AuthChallenge;
-use ed25519_dalek::VerifyingKey;
-use x25519_dalek::{EphemeralSecret, PublicKey};
-
-/// Context for state machine with validated key and sent challenge
-/// Challenge is then transformed to bytes using shared function and verified
-#[derive(Clone, Debug)]
-pub struct ChallengeContext {
-    pub challenge: AuthChallenge,
-    pub key: VerifyingKey,
-}
-
-pub struct UnsealContext {
-    pub client_public_key: PublicKey,
-    pub secret: Mutex<Option<EphemeralSecret>>,
-}
-
-smlang::statemachine!(
-    name: UserAgent,
-    custom_error: false,
-    transitions: {
-        *Init + AuthRequest =  ReceivedAuthRequest,
-        ReceivedAuthRequest + ReceivedBootstrapToken = Idle,
-
-        ReceivedAuthRequest + SentChallenge(ChallengeContext) / move_challenge = WaitingForChallengeSolution(ChallengeContext),
-
-        WaitingForChallengeSolution(ChallengeContext) + ReceivedGoodSolution = Idle,
-        WaitingForChallengeSolution(ChallengeContext) + ReceivedBadSolution = AuthError, // block further transitions, but connection should close anyway
-
-        Idle + UnsealRequest(UnsealContext) / generate_temp_keypair = WaitingForUnsealKey(UnsealContext),
-        WaitingForUnsealKey(UnsealContext) + ReceivedValidKey = Unsealed,
-        WaitingForUnsealKey(UnsealContext) + ReceivedInvalidKey = Idle,
-    }
-);
-
-pub struct DummyContext;
-impl UserAgentStateMachineContext for DummyContext {
-    #[allow(missing_docs)]
-    #[allow(clippy::unused_unit)]
-    fn generate_temp_keypair(&mut self, event_data: UnsealContext) -> Result<UnsealContext, ()> {
-        Ok(event_data)
-    }
-
-    #[allow(missing_docs)]
-    #[allow(clippy::unused_unit)]
-    fn move_challenge(&mut self, event_data: ChallengeContext) -> Result<ChallengeContext, ()> {
-        Ok(event_data)
-    }
-}
--- a/server/crates/arbiter-server/src/lib.rs
+++ b/server/crates/arbiter-server/src/lib.rs
@@ -1,19 +1,22 @@
 #![forbid(unsafe_code)]
 use arbiter_proto::{
-    proto::{ClientRequest, ClientResponse, UserAgentRequest, UserAgentResponse},
-    transport::{BiStream, GrpcTransportActor, wire},
+    proto::{
+        client::{ClientRequest, ClientResponse},
+        user_agent::{UserAgentRequest, UserAgentResponse},
+    },
+    transport::{IdentityRecvConverter, SendConverter, grpc},
 };
 use async_trait::async_trait;
-use kameo::actor::PreparedActor;
 use tokio_stream::wrappers::ReceiverStream;

 use tokio::sync::mpsc;
 use tonic::{Request, Response, Status};
+use tracing::info;

 use crate::{
    actors::{
-        client::handle_client,
-        user_agent::UserAgentActor,
+        client::{self, ClientError, ClientConnection as ClientConnectionProps, connect_client},
+        user_agent::{self, UserAgentConnection, UserAgentError, connect_user_agent},
    },
    context::ServerContext,
 };
@@ -24,6 +27,108 @@ pub mod db;

 const DEFAULT_CHANNEL_SIZE: usize = 1000;

+struct UserAgentGrpcSender;
+
+impl SendConverter for UserAgentGrpcSender {
+    type Input = Result<UserAgentResponse, UserAgentError>;
+    type Output = Result<UserAgentResponse, Status>;
+
+    fn convert(&self, item: Self::Input) -> Self::Output {
+        match item {
+            Ok(message) => Ok(message),
+            Err(err) => Err(user_agent_error_status(err)),
+        }
+    }
+}
+
+struct ClientGrpcSender;
+
+impl SendConverter for ClientGrpcSender {
+    type Input = Result<ClientResponse, ClientError>;
+    type Output = Result<ClientResponse, Status>;
+
+    fn convert(&self, item: Self::Input) -> Self::Output {
+        match item {
+            Ok(message) => Ok(message),
+            Err(err) => Err(client_error_status(err)),
+        }
+    }
+}
+
+fn client_error_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) => client_auth_error_status(err),
+        ClientError::ConnectionRegistrationFailed => {
+            Status::internal("Connection registration failed")
+        }
+    }
+}
+
+fn client_auth_error_status(value: &client::auth::Error) -> Status {
+    use client::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::InvalidSignatureLength => Status::invalid_argument("Invalid signature length"),
+        Error::PublicKeyNotRegistered | Error::InvalidChallengeSolution => {
+            Status::unauthenticated(value.to_string())
+        }
+        Error::Transport => Status::internal("Transport error"),
+        Error::DatabasePoolUnavailable => Status::internal("Database pool error"),
+        Error::DatabaseOperationFailed => Status::internal("Database error"),
+    }
+}
+
+fn user_agent_error_status(value: UserAgentError) -> Status {
+    match value {
+        UserAgentError::MissingRequestPayload | UserAgentError::UnexpectedRequestPayload => {
+            Status::invalid_argument("Expected message with payload")
+        }
+        UserAgentError::InvalidStateForUnsealEncryptedKey => {
+            Status::failed_precondition("Invalid state for unseal encrypted key")
+        }
+        UserAgentError::InvalidClientPubkeyLength => {
+            Status::invalid_argument("client_pubkey must be 32 bytes")
+        }
+        UserAgentError::StateTransitionFailed => Status::internal("State machine error"),
+        UserAgentError::KeyHolderActorUnreachable => Status::internal("Vault is not available"),
+        UserAgentError::Auth(ref err) => auth_error_status(err),
+        UserAgentError::ConnectionRegistrationFailed => {
+            Status::internal("Failed registering connection")
+        }
+    }
+}
+
+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"),
+    }
+}
+
 pub struct Server {
    context: ServerContext,
 }
@@ -39,44 +144,54 @@ impl arbiter_proto::proto::arbiter_service_server::ArbiterService for Server {
    type UserAgentStream = ReceiverStream<Result<UserAgentResponse, Status>>;
    type ClientStream = ReceiverStream<Result<ClientResponse, Status>>;

+    #[tracing::instrument(level = "debug", skip(self))]
    async fn client(
        &self,
        request: Request<tonic::Streaming<ClientRequest>>,
    ) -> Result<Response<Self::ClientStream>, Status> {
        let req_stream = request.into_inner();
        let (tx, rx) = mpsc::channel(DEFAULT_CHANNEL_SIZE);
-        tokio::spawn(handle_client(
-            self.context.clone(),
-            BiStream {
-                request_stream: req_stream,
-                response_sender: tx,
-            },
-        ));
+
+        let transport = grpc::GrpcAdapter::new(
+            tx,
+            req_stream,
+            IdentityRecvConverter::<ClientRequest>::new(),
+            ClientGrpcSender,
+        );
+        let props = ClientConnectionProps::new(
+            self.context.db.clone(),
+            Box::new(transport),
+            self.context.actors.clone(),
+        );
+        tokio::spawn(connect_client(props));
+
+        info!(event = "connection established", "grpc.client");

        Ok(Response::new(ReceiverStream::new(rx)))
    }

+    #[tracing::instrument(level = "debug", skip(self))]
    async fn user_agent(
        &self,
        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 context = self.context.clone();

-        wire(
-            |prepared: PreparedActor<UserAgentActor>, recipient| {
-                prepared.spawn(UserAgentActor::new(context, recipient));
-            },
-            |prepared: PreparedActor<GrpcTransportActor<_, _, _>>, business_recipient| {
-                prepared.spawn(GrpcTransportActor::new(
-                    tx,
-                    req_stream,
-                    business_recipient,
-                ));
-            },
-        )
-        .await;
+        let transport = grpc::GrpcAdapter::new(
+            tx,
+            req_stream,
+            IdentityRecvConverter::<UserAgentRequest>::new(),
+            UserAgentGrpcSender,
+        );
+        let props = UserAgentConnection::new(
+            self.context.db.clone(),
+            self.context.actors.clone(),
+            Box::new(transport),
+        );
+        tokio::spawn(connect_user_agent(props));
+
+        info!(event = "connection established", "grpc.user_agent");

        Ok(Response::new(ReceiverStream::new(rx)))
    }
--- a/server/crates/arbiter-server/tests/client.rs
+++ b/server/crates/arbiter-server/tests/client.rs
@@ -0,0 +1,4 @@
+mod common;
+
+#[path = "client/auth.rs"]
+mod auth;
--- a/server/crates/arbiter-server/tests/client/auth.rs
+++ b/server/crates/arbiter-server/tests/client/auth.rs
@@ -0,0 +1,111 @@
+use arbiter_proto::proto::client::{
+    AuthChallengeRequest, AuthChallengeSolution, ClientRequest,
+    client_request::Payload as ClientRequestPayload,
+    client_response::Payload as ClientResponsePayload,
+};
+use arbiter_proto::transport::Bi;
+use arbiter_server::actors::GlobalActors;
+use arbiter_server::{
+    actors::client::{ClientConnection, connect_client},
+    db::{self, schema},
+};
+use diesel::{ExpressionMethods as _, insert_into};
+use diesel_async::RunQueryDsl;
+use ed25519_dalek::Signer as _;
+
+use super::common::ChannelTransport;
+
+#[tokio::test]
+#[test_log::test]
+pub async fn test_unregistered_pubkey_rejected() {
+    let db = db::create_test_pool().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 new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
+    let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
+
+    test_transport
+        .send(ClientRequest {
+            payload: Some(ClientRequestPayload::AuthChallengeRequest(
+                AuthChallengeRequest {
+                    pubkey: pubkey_bytes,
+                },
+            )),
+        })
+        .await
+        .unwrap();
+
+    // Auth fails, connect_client returns, transport drops
+    task.await.unwrap();
+}
+
+#[tokio::test]
+#[test_log::test]
+pub async fn test_challenge_auth() {
+    let db = db::create_test_pool().await;
+
+    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();
+    }
+
+    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));
+
+    // Send challenge request
+    test_transport
+        .send(ClientRequest {
+            payload: Some(ClientRequestPayload::AuthChallengeRequest(
+                AuthChallengeRequest {
+                    pubkey: pubkey_bytes,
+                },
+            )),
+        })
+        .await
+        .unwrap();
+
+    // Read the challenge response
+    let response = test_transport
+        .recv()
+        .await
+        .expect("should receive challenge");
+    let challenge = match response {
+        Ok(resp) => match resp.payload {
+            Some(ClientResponsePayload::AuthChallenge(c)) => c,
+            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.nonce, &challenge.pubkey);
+    let signature = new_key.sign(&formatted_challenge);
+
+    test_transport
+        .send(ClientRequest {
+            payload: Some(ClientRequestPayload::AuthChallengeSolution(
+                AuthChallengeSolution {
+                    signature: signature.to_bytes().to_vec(),
+                },
+            )),
+        })
+        .await
+        .unwrap();
+
+    // Auth completes, session spawned
+    task.await.unwrap();
+}
--- a/server/crates/arbiter-server/tests/common/mod.rs
+++ b/server/crates/arbiter-server/tests/common/mod.rs
@@ -1,10 +1,14 @@
+use arbiter_proto::transport::{Bi, Error};
 use arbiter_server::{
    actors::keyholder::KeyHolder,
    db::{self, schema},
 };
+use async_trait::async_trait;
 use diesel::QueryDsl;
 use diesel_async::RunQueryDsl;
 use memsafe::MemSafe;
+use tokio::sync::mpsc;
+

 #[allow(dead_code)]
 pub async fn bootstrapped_keyholder(db: &db::DatabasePool) -> KeyHolder {
@@ -26,3 +30,46 @@ pub async fn root_key_history_id(db: &db::DatabasePool) -> i32 {
        .unwrap();
    id.expect("root_key_id should be set after bootstrap")
 }
+
+
+pub struct ChannelTransport<T, Y> {
+    receiver: mpsc::Receiver<T>,
+    sender: mpsc::Sender<Y>,
+}
+
+impl<T, Y> ChannelTransport<T, Y> {
+    pub fn new() -> (Self, ChannelTransport<Y, T>) {
+        let (tx1, rx1) = mpsc::channel(10);
+        let (tx2, rx2) = mpsc::channel(10);
+        (
+            Self {
+                receiver: rx1,
+                sender: tx2,
+            },
+            ChannelTransport {
+                receiver: rx2,
+                sender: tx1,
+            },
+        )
+    }
+}
+
+
+
+#[async_trait]
+impl<T, Y> Bi<T, Y> for ChannelTransport<T, Y>
+where
+    T: Send + 'static,
+    Y: Send + 'static,
+{
+    async fn send(&mut self, item: Y) -> Result<(), Error> {
+        self.sender
+            .send(item)
+            .await
+            .map_err(|_| Error::ChannelClosed)
+    }
+
+    async fn recv(&mut self) -> Option<T> {
+        self.receiver.recv().await
+    }
+}
--- a/server/crates/arbiter-server/tests/user_agent.rs
+++ b/server/crates/arbiter-server/tests/user_agent.rs
@@ -1,30 +1,5 @@
 mod common;

-use arbiter_proto::proto::UserAgentResponse;
-use arbiter_server::actors::user_agent::UserAgentError;
-use kameo::{Actor, actor::Recipient, actor::Spawn, prelude::Message};
-
-/// A no-op actor that discards any messages it receives.
-#[derive(Actor)]
-struct NullSink;
-
-impl Message<Result<UserAgentResponse, UserAgentError>> for NullSink {
-    type Reply = ();
-
-    async fn handle(
-        &mut self,
-        _msg: Result<UserAgentResponse, UserAgentError>,
-        _ctx: &mut kameo::prelude::Context<Self, Self::Reply>,
-    ) -> Self::Reply {
-    }
-}
-
-/// Creates a `Recipient` that silently discards all messages.
-fn null_recipient() -> Recipient<Result<UserAgentResponse, UserAgentError>> {
-    let actor_ref = NullSink::spawn(NullSink);
-    actor_ref.recipient()
-}
-
 #[path = "user_agent/auth.rs"]
 mod auth;
 #[path = "user_agent/unseal.rs"]
--- a/server/crates/arbiter-server/tests/user_agent/auth.rs
+++ b/server/crates/arbiter-server/tests/user_agent/auth.rs
@@ -1,57 +1,50 @@
-use arbiter_proto::proto::{
-    UserAgentResponse,
-    auth::{self, AuthChallengeRequest, AuthOk},
+use arbiter_proto::proto::user_agent::{
+    AuthChallengeRequest, AuthChallengeSolution, UserAgentRequest,
+    user_agent_request::Payload as UserAgentRequestPayload,
    user_agent_response::Payload as UserAgentResponsePayload,
 };
+use arbiter_proto::transport::Bi;
 use arbiter_server::{
    actors::{
        GlobalActors,
        bootstrap::GetToken,
-        user_agent::{HandleAuthChallengeRequest, HandleAuthChallengeSolution, UserAgentActor},
+        user_agent::{UserAgentConnection, connect_user_agent},
    },
    db::{self, schema},
 };
 use diesel::{ExpressionMethods as _, QueryDsl, insert_into};
 use diesel_async::RunQueryDsl;
 use ed25519_dalek::Signer as _;
-use kameo::actor::Spawn;
+
+use super::common::ChannelTransport;

 #[tokio::test]
 #[test_log::test]
 pub async fn test_bootstrap_token_auth() {
-    let db =db::create_test_pool().await;
-
+    let db = db::create_test_pool().await;
    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
    let token = actors.bootstrapper.ask(GetToken).await.unwrap().unwrap();
-    let user_agent =
-        UserAgentActor::new_manual(db.clone(), actors, super::null_recipient());
-    let user_agent_ref = UserAgentActor::spawn(user_agent);
+
+    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 new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
    let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();

-    let result = user_agent_ref
-        .ask(HandleAuthChallengeRequest {
-            req: AuthChallengeRequest {
-                pubkey: pubkey_bytes,
-                bootstrap_token: Some(token),
-            },
-        })
-        .await
-        .expect("Shouldn't fail to send message");
-
-    assert_eq!(
-        result,
-        UserAgentResponse {
-            payload: Some(UserAgentResponsePayload::AuthMessage(
-                arbiter_proto::proto::auth::ServerMessage {
-                    payload: Some(arbiter_proto::proto::auth::server_message::Payload::AuthOk(
-                        AuthOk {},
-                    )),
+    test_transport
+        .send(UserAgentRequest {
+            payload: Some(UserAgentRequestPayload::AuthChallengeRequest(
+                AuthChallengeRequest {
+                    pubkey: pubkey_bytes,
+                    bootstrap_token: Some(token),
                },
            )),
-        }
-    );
+        })
+        .await
+        .unwrap();
+
+    task.await.unwrap();

    let mut conn = db.get().await.unwrap();
    let stored_pubkey: Vec<u8> = schema::useragent_client::table
@@ -66,49 +59,45 @@ pub async fn test_bootstrap_token_auth() {
 #[test_log::test]
 pub async fn test_bootstrap_invalid_token_auth() {
    let db = db::create_test_pool().await;
-
    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
-    let user_agent =
-        UserAgentActor::new_manual(db.clone(), actors, super::null_recipient());
-    let user_agent_ref = UserAgentActor::spawn(user_agent);
+
+    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 new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
    let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();

-    let result = user_agent_ref
-        .ask(HandleAuthChallengeRequest {
-            req: AuthChallengeRequest {
-                pubkey: pubkey_bytes,
-                bootstrap_token: Some("invalid_token".to_string()),
-            },
+    test_transport
+        .send(UserAgentRequest {
+            payload: Some(UserAgentRequestPayload::AuthChallengeRequest(
+                AuthChallengeRequest {
+                    pubkey: pubkey_bytes,
+                    bootstrap_token: Some("invalid_token".to_string()),
+                },
+            )),
        })
-        .await;
+        .await
+        .unwrap();

-    match result {
-        Err(kameo::error::SendError::HandlerError(err)) => {
-            assert!(
-                matches!(err, arbiter_server::actors::user_agent::UserAgentError::InvalidBootstrapToken),
-                "Expected InvalidBootstrapToken, got {err:?}"
-            );
-        }
-        Err(other) => {
-            panic!("Expected SendError::HandlerError, got {other:?}");
-        }
-        Ok(_) => {
-            panic!("Expected error due to invalid bootstrap token, but got success");
-        }
-    }
+    // Auth fails, connect_user_agent returns, transport drops
+    task.await.unwrap();
+
+    // Verify no key was registered
+    let mut conn = db.get().await.unwrap();
+    let count: i64 = schema::useragent_client::table
+        .count()
+        .get_result::<i64>(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(count, 0);
 }

 #[tokio::test]
 #[test_log::test]
 pub async fn test_challenge_auth() {
    let db = db::create_test_pool().await;
-
    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
-    let user_agent =
-        UserAgentActor::new_manual(db.clone(), actors, super::null_recipient());
-    let user_agent_ref = UserAgentActor::spawn(user_agent);

    let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
    let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
@@ -122,50 +111,51 @@ pub async fn test_challenge_auth() {
            .unwrap();
    }

-    let result = user_agent_ref
-        .ask(HandleAuthChallengeRequest {
-            req: AuthChallengeRequest {
-                pubkey: pubkey_bytes,
-                bootstrap_token: None,
-            },
-        })
-        .await
-        .expect("Shouldn't fail to send message");
+    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 UserAgentResponse {
-        payload:
-            Some(UserAgentResponsePayload::AuthMessage(arbiter_proto::proto::auth::ServerMessage {
-                payload:
-                    Some(arbiter_proto::proto::auth::server_message::Payload::AuthChallenge(challenge)),
-            })),
-    } = result
-    else {
-        panic!("Expected auth challenge response, got {result:?}");
-    };
-
-    let formatted_challenge = arbiter_proto::format_challenge(&challenge);
-    let signature = new_key.sign(&formatted_challenge);
-    let serialized_signature = signature.to_bytes().to_vec();
-
-    let result = user_agent_ref
-        .ask(HandleAuthChallengeSolution {
-            solution: auth::AuthChallengeSolution {
-                signature: serialized_signature,
-            },
-        })
-        .await
-        .expect("Shouldn't fail to send message");
-
-    assert_eq!(
-        result,
-        UserAgentResponse {
-            payload: Some(UserAgentResponsePayload::AuthMessage(
-                arbiter_proto::proto::auth::ServerMessage {
-                    payload: Some(arbiter_proto::proto::auth::server_message::Payload::AuthOk(
-                        AuthOk {},
-                    )),
+    // Send challenge request
+    test_transport
+        .send(UserAgentRequest {
+            payload: Some(UserAgentRequestPayload::AuthChallengeRequest(
+                AuthChallengeRequest {
+                    pubkey: pubkey_bytes,
+                    bootstrap_token: None,
                },
            )),
-        }
-    );
+        })
+        .await
+        .unwrap();
+
+    // Read the challenge response
+    let response = test_transport
+        .recv()
+        .await
+        .expect("should receive challenge");
+    let challenge = match response {
+        Ok(resp) => match resp.payload {
+            Some(UserAgentResponsePayload::AuthChallenge(c)) => c,
+            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.nonce, &challenge.pubkey);
+    let signature = new_key.sign(&formatted_challenge);
+
+    test_transport
+        .send(UserAgentRequest {
+            payload: Some(UserAgentRequestPayload::AuthChallengeSolution(
+                AuthChallengeSolution {
+                    signature: signature.to_bytes().to_vec(),
+                },
+            )),
+        })
+        .await
+        .unwrap();
+
+    // Auth completes, session spawned
+    task.await.unwrap();
 }
--- a/server/crates/arbiter-server/tests/user_agent/unseal.rs
+++ b/server/crates/arbiter-server/tests/user_agent/unseal.rs
@@ -1,30 +1,26 @@
-use arbiter_proto::proto::{
-    UnsealEncryptedKey, UnsealResult, UnsealStart, auth::AuthChallengeRequest,
+use arbiter_proto::proto::user_agent::{
+    UnsealEncryptedKey, UnsealResult, UnsealStart, UserAgentRequest,
+    user_agent_request::Payload as UserAgentRequestPayload,
    user_agent_response::Payload as UserAgentResponsePayload,
 };
 use arbiter_server::{
    actors::{
        GlobalActors,
-        bootstrap::GetToken,
        keyholder::{Bootstrap, Seal},
-        user_agent::{
-            HandleAuthChallengeRequest, HandleUnsealEncryptedKey, HandleUnsealRequest,
-            UserAgentActor,
-        },
+        user_agent::session::UserAgentSession,
    },
    db,
 };
 use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
-use kameo::actor::{ActorRef, Spawn};
 use memsafe::MemSafe;
 use x25519_dalek::{EphemeralSecret, PublicKey};

-async fn setup_authenticated_user_agent(
+async fn setup_sealed_user_agent(
    seal_key: &[u8],
-) -> (arbiter_server::db::DatabasePool, ActorRef<UserAgentActor>) {
+) -> (db::DatabasePool, UserAgentSession) {
    let db = db::create_test_pool().await;
-
    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
+
    actors
        .key_holder
        .ask(Bootstrap {
@@ -34,37 +30,23 @@ async fn setup_authenticated_user_agent(
        .unwrap();
    actors.key_holder.ask(Seal).await.unwrap();

-    let user_agent =
-        UserAgentActor::new_manual(db.clone(), actors.clone(), super::null_recipient());
-    let user_agent_ref = UserAgentActor::spawn(user_agent);
+    let session = UserAgentSession::new_test(db.clone(), actors);

-    let token = actors.bootstrapper.ask(GetToken).await.unwrap().unwrap();
-    let auth_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
-    user_agent_ref
-        .ask(HandleAuthChallengeRequest {
-            req: AuthChallengeRequest {
-                pubkey: auth_key.verifying_key().to_bytes().to_vec(),
-                bootstrap_token: Some(token),
-            },
-        })
-        .await
-        .unwrap();
-
-    (db, user_agent_ref)
+    (db, session)
 }

 async fn client_dh_encrypt(
-    user_agent_ref: &ActorRef<UserAgentActor>,
+    user_agent: &mut UserAgentSession,
    key_to_send: &[u8],
 ) -> UnsealEncryptedKey {
    let client_secret = EphemeralSecret::random();
    let client_public = PublicKey::from(&client_secret);

-    let response = user_agent_ref
-        .ask(HandleUnsealRequest {
-            req: UnsealStart {
+    let response = user_agent
+        .process_transport_inbound(UserAgentRequest {
+            payload: Some(UserAgentRequestPayload::UnsealStart(UnsealStart {
                client_pubkey: client_public.as_bytes().to_vec(),
-            },
+            })),
        })
        .await
        .unwrap();
@@ -91,16 +73,22 @@ async fn client_dh_encrypt(
    }
 }

+fn unseal_key_request(req: UnsealEncryptedKey) -> UserAgentRequest {
+    UserAgentRequest {
+        payload: Some(UserAgentRequestPayload::UnsealEncryptedKey(req)),
+    }
+}
+
 #[tokio::test]
 #[test_log::test]
 pub async fn test_unseal_success() {
    let seal_key = b"test-seal-key";
-    let (_db, user_agent_ref) = setup_authenticated_user_agent(seal_key).await;
+    let (_db, mut user_agent) = setup_sealed_user_agent(seal_key).await;

-    let encrypted_key = client_dh_encrypt(&user_agent_ref, seal_key).await;
+    let encrypted_key = client_dh_encrypt(&mut user_agent, seal_key).await;

-    let response = user_agent_ref
-        .ask(HandleUnsealEncryptedKey { req: encrypted_key })
+    let response = user_agent
+        .process_transport_inbound(unseal_key_request(encrypted_key))
        .await
        .unwrap();

@@ -113,12 +101,12 @@ pub async fn test_unseal_success() {
 #[tokio::test]
 #[test_log::test]
 pub async fn test_unseal_wrong_seal_key() {
-    let (_db, user_agent_ref) = setup_authenticated_user_agent(b"correct-key").await;
+    let (_db, mut user_agent) = setup_sealed_user_agent(b"correct-key").await;

-    let encrypted_key = client_dh_encrypt(&user_agent_ref, b"wrong-key").await;
+    let encrypted_key = client_dh_encrypt(&mut user_agent, b"wrong-key").await;

-    let response = user_agent_ref
-        .ask(HandleUnsealEncryptedKey { req: encrypted_key })
+    let response = user_agent
+        .process_transport_inbound(unseal_key_request(encrypted_key))
        .await
        .unwrap();

@@ -131,28 +119,26 @@ pub async fn test_unseal_wrong_seal_key() {
 #[tokio::test]
 #[test_log::test]
 pub async fn test_unseal_corrupted_ciphertext() {
-    let (_db, user_agent_ref) = setup_authenticated_user_agent(b"test-key").await;
+    let (_db, mut user_agent) = setup_sealed_user_agent(b"test-key").await;

    let client_secret = EphemeralSecret::random();
    let client_public = PublicKey::from(&client_secret);

-    user_agent_ref
-        .ask(HandleUnsealRequest {
-            req: UnsealStart {
+    user_agent
+        .process_transport_inbound(UserAgentRequest {
+            payload: Some(UserAgentRequestPayload::UnsealStart(UnsealStart {
                client_pubkey: client_public.as_bytes().to_vec(),
-            },
+            })),
        })
        .await
        .unwrap();

-    let response = user_agent_ref
-        .ask(HandleUnsealEncryptedKey {
-            req: UnsealEncryptedKey {
-                nonce: vec![0u8; 24],
-                ciphertext: vec![0u8; 32],
-                associated_data: vec![],
-            },
-        })
+    let response = user_agent
+        .process_transport_inbound(unseal_key_request(UnsealEncryptedKey {
+            nonce: vec![0u8; 24],
+            ciphertext: vec![0u8; 32],
+            associated_data: vec![],
+        }))
        .await
        .unwrap();

@@ -162,49 +148,17 @@ pub async fn test_unseal_corrupted_ciphertext() {
    );
 }

-#[tokio::test]
-#[test_log::test]
-pub async fn test_unseal_start_without_auth_fails() {
-    let db = db::create_test_pool().await;
-
-    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
-    let user_agent =
-        UserAgentActor::new_manual(db.clone(), actors, super::null_recipient());
-    let user_agent_ref = UserAgentActor::spawn(user_agent);
-
-    let client_secret = EphemeralSecret::random();
-    let client_public = PublicKey::from(&client_secret);
-
-    let result = user_agent_ref
-        .ask(HandleUnsealRequest {
-            req: UnsealStart {
-                client_pubkey: client_public.as_bytes().to_vec(),
-            },
-        })
-        .await;
-
-    match result {
-        Err(kameo::error::SendError::HandlerError(err)) => {
-            assert!(
-                matches!(err, arbiter_server::actors::user_agent::UserAgentError::InvalidState),
-                "Expected InvalidState, got {err:?}"
-            );
-        }
-        other => panic!("Expected state machine error, got {other:?}"),
-    }
-}
-
 #[tokio::test]
 #[test_log::test]
 pub async fn test_unseal_retry_after_invalid_key() {
    let seal_key = b"real-seal-key";
-    let (_db, user_agent_ref) = setup_authenticated_user_agent(seal_key).await;
+    let (_db, mut user_agent) = setup_sealed_user_agent(seal_key).await;

    {
-        let encrypted_key = client_dh_encrypt(&user_agent_ref, b"wrong-key").await;
+        let encrypted_key = client_dh_encrypt(&mut user_agent, b"wrong-key").await;

-        let response = user_agent_ref
-            .ask(HandleUnsealEncryptedKey { req: encrypted_key })
+        let response = user_agent
+            .process_transport_inbound(unseal_key_request(encrypted_key))
            .await
            .unwrap();

@@ -215,10 +169,10 @@ pub async fn test_unseal_retry_after_invalid_key() {
    }

    {
-        let encrypted_key = client_dh_encrypt(&user_agent_ref, seal_key).await;
+        let encrypted_key = client_dh_encrypt(&mut user_agent, seal_key).await;

-        let response = user_agent_ref
-            .ask(HandleUnsealEncryptedKey { req: encrypted_key })
+        let response = user_agent
+            .process_transport_inbound(unseal_key_request(encrypted_key))
            .await
            .unwrap();

--- a/server/crates/arbiter-useragent/Cargo.toml
+++ b/server/crates/arbiter-useragent/Cargo.toml
@@ -9,7 +9,13 @@ arbiter-proto.path = "../arbiter-proto"
 kameo.workspace = true
 tokio = {workspace = true, features = ["net"]}
 tonic.workspace = true
+tonic.features = ["tls-aws-lc"]
 tracing.workspace = true
 ed25519-dalek.workspace = true
 smlang.workspace = true
 x25519-dalek.workspace = true
+thiserror.workspace = true
+tokio-stream.workspace = true
+http = "1.4.0"
+rustls-webpki = { version = "0.103.9", features = ["aws-lc-rs"] }
+async-trait.workspace = true
--- a/server/crates/arbiter-useragent/src/grpc.rs
+++ b/server/crates/arbiter-useragent/src/grpc.rs
@@ -0,0 +1,72 @@
+use arbiter_proto::{
+    proto::{
+        user_agent::{UserAgentRequest, UserAgentResponse},
+        arbiter_service_client::ArbiterServiceClient,
+    },
+    transport::{IdentityRecvConverter, IdentitySendConverter, grpc},
+    url::ArbiterUrl,
+};
+use ed25519_dalek::SigningKey;
+use kameo::actor::{ActorRef, Spawn};
+
+use tokio::sync::mpsc;
+use tokio_stream::wrappers::ReceiverStream;
+
+use tonic::transport::ClientTlsConfig;
+
+
+#[derive(Debug, thiserror::Error)]
+pub enum ConnectError {
+    #[error("Could 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("gRPC error")]
+    Grpc(#[from] tonic::Status),
+}
+
+    use super::UserAgentActor;
+
+pub type UserAgentGrpc = ActorRef<
+    UserAgentActor<
+        grpc::GrpcAdapter<
+            IdentityRecvConverter<UserAgentResponse>,
+            IdentitySendConverter<UserAgentRequest>,
+        >,
+    >,
+>;
+pub async fn connect_grpc(
+    url: ArbiterUrl,
+    key: SigningKey,
+) -> Result<UserAgentGrpc, ConnectError> {
+    let bootstrap_token = url.bootstrap_token.clone();
+    let anchor = webpki::anchor_from_trusted_cert(&url.ca_cert)?.to_owned();
+    let tls = ClientTlsConfig::new().trust_anchor(anchor);
+
+    // TODO: if `host` is localhost, we need to verify server's process authenticity
+    let channel = tonic::transport::Channel::from_shared(format!("{}:{}", url.host, url.port))?
+        .tls_config(tls)?
+        .connect()
+        .await?;
+
+    let mut client = ArbiterServiceClient::new(channel);
+    let (tx, rx) = mpsc::channel(16);
+    let bistream = client.user_agent(ReceiverStream::new(rx)).await?;
+    let bistream = bistream.into_inner();
+
+    let adapter = grpc::GrpcAdapter::new(
+        tx,
+        bistream,
+        IdentityRecvConverter::new(),
+        IdentitySendConverter::new(),
+    );
+
+    let actor = UserAgentActor::spawn(UserAgentActor::new(key, bootstrap_token, adapter));
+
+    Ok(actor)
+}
--- a/server/crates/arbiter-useragent/src/lib.rs
+++ b/server/crates/arbiter-useragent/src/lib.rs
@@ -1,66 +1,195 @@
-use arbiter_proto::{proto::UserAgentRequest, transport::TransportActor};
-use ed25519_dalek::SigningKey;
-use kameo::{
-    Actor, Reply,
-    actor::{ActorRef, WeakActorRef},
-    prelude::Message,
+use arbiter_proto::{
+    format_challenge,
+    proto::user_agent::{
+        AuthChallengeRequest, AuthChallengeSolution, AuthOk,
+        UserAgentRequest, UserAgentResponse,
+        user_agent_request::Payload as UserAgentRequestPayload,
+        user_agent_response::Payload as UserAgentResponsePayload,
+    },
+    transport::Bi,
 };
+use ed25519_dalek::{Signer, SigningKey};
+use kameo::{Actor, actor::ActorRef};
 use smlang::statemachine;
-use tonic::transport::CertificateDer;
-use tracing::{debug, error};
-
-struct Storage {
-    pub identity: SigningKey,
-    pub server_ca_cert: CertificateDer<'static>,
-}
-
-#[derive(Debug)]
-pub enum InitError {
-    StorageError,
-    Other(String),
-}
+use tokio::select;
+use tracing::{error, info};

 statemachine! {
-    name: UserAgentStateMachine,
+    name: UserAgent,
    custom_error: false,
    transitions: {
-        *Init + SendAuthChallenge = WaitingForAuthSolution
+        *Init + SentAuthChallengeRequest = WaitingForServerAuth,
+        WaitingForServerAuth + ReceivedAuthChallenge = WaitingForAuthOk,
+        WaitingForServerAuth + ReceivedAuthOk = Authenticated,
+        WaitingForAuthOk + ReceivedAuthOk = Authenticated,
    }
 }

+pub struct DummyContext;
+impl UserAgentStateMachineContext for DummyContext {}

+#[derive(Debug, thiserror::Error)]
+pub enum InboundError {
+    #[error("Invalid user agent response")]
+    InvalidResponse,
+    #[error("Expected response payload")]
+    MissingResponsePayload,
+    #[error("Unexpected response payload")]
+    UnexpectedResponsePayload,
+    #[error("Invalid state for auth challenge")]
+    InvalidStateForAuthChallenge,
+    #[error("Invalid state for auth ok")]
+    InvalidStateForAuthOk,
+    #[error("State machine error")]
+    StateTransitionFailed,
+    #[error("Transport send failed")]
+    TransportSendFailed,
+}

-pub struct UserAgentActor<A: TransportActor<UserAgentRequest>> {
+pub struct UserAgentActor<Transport>
+where
+    Transport: Bi<UserAgentResponse, UserAgentRequest>,
+{
    key: SigningKey,
-    server_ca_cert: CertificateDer<'static>,
-    sender: ActorRef<A>,
+    bootstrap_token: Option<String>,
+    state: UserAgentStateMachine<DummyContext>,
+    transport: Transport,
 }
-impl<A: TransportActor<UserAgentRequest>> Actor for UserAgentActor<A> {
-    type Args = Self;

-    type Error = InitError;
-
-    async fn on_start(args: Self::Args, actor_ref: ActorRef<Self>) -> Result<Self, Self::Error> {
-        todo!()
+impl<Transport> UserAgentActor<Transport>
+where
+    Transport: Bi<UserAgentResponse, UserAgentRequest>,
+{
+    pub fn new(key: SigningKey, bootstrap_token: Option<String>, transport: Transport) -> Self {
+        Self {
+            key,
+            bootstrap_token,
+            state: UserAgentStateMachine::new(DummyContext),
+            transport,
+        }
    }

-    async fn on_link_died(
+    fn transition(&mut self, event: UserAgentEvents) -> Result<(), InboundError> {
+        self.state.process_event(event).map_err(|e| {
+            error!(?e, "useragent state transition failed");
+            InboundError::StateTransitionFailed
+        })?;
+        Ok(())
+    }
+
+    async fn send_auth_challenge_request(&mut self) -> Result<(), InboundError> {
+        let req = AuthChallengeRequest {
+            pubkey: self.key.verifying_key().to_bytes().to_vec(),
+            bootstrap_token: self.bootstrap_token.take(),
+        };
+
+        self.transition(UserAgentEvents::SentAuthChallengeRequest)?;
+
+        self.transport
+            .send(UserAgentRequest {
+                payload: Some(UserAgentRequestPayload::AuthChallengeRequest(req)),
+            })
+            .await
+            .map_err(|_| InboundError::TransportSendFailed)?;
+
+        info!(actor = "useragent", "auth.request.sent");
+        Ok(())
+    }
+
+    async fn handle_auth_challenge(
        &mut self,
-        _: WeakActorRef<Self>,
-        id: kameo::prelude::ActorId,
-        _: kameo::prelude::ActorStopReason,
-    ) -> Result<std::ops::ControlFlow<kameo::prelude::ActorStopReason>, Self::Error> {
-        if id == self.sender.id() {
-            error!("Transport actor died, stopping UserAgentActor");
-            Ok(std::ops::ControlFlow::Break(
-                kameo::prelude::ActorStopReason::Normal,
-            ))
-        } else {
-            debug!(
-                "Linked actor {} died, but it's not the transport actor, ignoring",
-                id
-            );
-            Ok(std::ops::ControlFlow::Continue(()))
+        challenge: arbiter_proto::proto::user_agent::AuthChallenge,
+    ) -> Result<(), InboundError> {
+        self.transition(UserAgentEvents::ReceivedAuthChallenge)?;
+
+        let formatted = format_challenge(challenge.nonce, &challenge.pubkey);
+        let signature = self.key.sign(&formatted);
+        let solution = AuthChallengeSolution {
+            signature: signature.to_bytes().to_vec(),
+        };
+
+        self.transport
+            .send(UserAgentRequest {
+                payload: Some(UserAgentRequestPayload::AuthChallengeSolution(solution)),
+            })
+            .await
+            .map_err(|_| InboundError::TransportSendFailed)?;
+
+        info!(actor = "useragent", "auth.solution.sent");
+        Ok(())
+    }
+
+    fn handle_auth_ok(&mut self, _ok: AuthOk) -> Result<(), InboundError> {
+        self.transition(UserAgentEvents::ReceivedAuthOk)?;
+        info!(actor = "useragent", "auth.ok");
+        Ok(())
+    }
+
+    pub async fn process_inbound_transport(
+        &mut self,
+        inbound: UserAgentResponse
+    ) -> Result<(), InboundError> {
+        let payload = inbound
+            .payload
+            .ok_or(InboundError::MissingResponsePayload)?;
+
+        match payload {
+            UserAgentResponsePayload::AuthChallenge(challenge) => {
+                self.handle_auth_challenge(challenge).await
+            }
+            UserAgentResponsePayload::AuthOk(ok) => self.handle_auth_ok(ok),
+            _ => Err(InboundError::UnexpectedResponsePayload),
        }
    }
 }
+
+impl<Transport> Actor for UserAgentActor<Transport>
+where
+    Transport: Bi<UserAgentResponse, UserAgentRequest>,
+{
+    type Args = Self;
+
+    type Error = ();
+
+    async fn on_start(
+        mut args: Self::Args,
+        _actor_ref: ActorRef<Self>,
+    ) -> Result<Self, Self::Error> {
+        if let Err(err) = args.send_auth_challenge_request().await {
+            error!(?err, actor = "useragent", "auth.start.failed");
+            return Err(());
+        }
+        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;
+                }
+                inbound = self.transport.recv() => {
+                    match inbound {
+                        Some(inbound) => {
+                            if let Err(err) = self.process_inbound_transport(inbound).await {
+                                error!(?err, actor = "useragent", "transport.inbound.failed");
+                                return Some(kameo::mailbox::Signal::Stop);
+                            }
+                        }
+                        None => {
+                            info!(actor = "useragent", "transport.closed");
+                            return Some(kameo::mailbox::Signal::Stop);
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+mod grpc;
+pub use grpc::{connect_grpc, ConnectError};
--- a/server/crates/arbiter-useragent/tests/auth.rs
+++ b/server/crates/arbiter-useragent/tests/auth.rs
@@ -0,0 +1,141 @@
+use arbiter_proto::{
+    format_challenge,
+    proto::user_agent::{
+        AuthChallenge, AuthOk,
+        UserAgentRequest, UserAgentResponse,
+        user_agent_request::Payload as UserAgentRequestPayload,
+        user_agent_response::Payload as UserAgentResponsePayload,
+    },
+    transport::Bi,
+};
+use arbiter_useragent::UserAgentActor;
+use ed25519_dalek::SigningKey;
+use kameo::actor::Spawn;
+use tokio::sync::mpsc;
+use tokio::time::{Duration, timeout};
+use async_trait::async_trait;
+
+struct TestTransport {
+    inbound_rx: mpsc::Receiver<UserAgentResponse>,
+    outbound_tx: mpsc::Sender<UserAgentRequest>,
+}
+
+#[async_trait]
+impl Bi<UserAgentResponse, UserAgentRequest> for TestTransport {
+    async fn send(&mut self, item: UserAgentRequest) -> Result<(), arbiter_proto::transport::Error> {
+        self.outbound_tx
+            .send(item)
+            .await
+            .map_err(|_| arbiter_proto::transport::Error::ChannelClosed)
+    }
+
+    async fn recv(&mut self) -> Option<UserAgentResponse> {
+        self.inbound_rx.recv().await
+    }
+}
+
+fn make_transport() -> (
+    TestTransport,
+    mpsc::Sender<UserAgentResponse>,
+    mpsc::Receiver<UserAgentRequest>,
+) {
+    let (inbound_tx, inbound_rx) = mpsc::channel(8);
+    let (outbound_tx, outbound_rx) = mpsc::channel(8);
+    (
+        TestTransport {
+            inbound_rx,
+            outbound_tx,
+        },
+        inbound_tx,
+        outbound_rx,
+    )
+}
+
+fn test_key() -> SigningKey {
+    SigningKey::from_bytes(&[7u8; 32])
+}
+
+#[tokio::test]
+async fn sends_auth_request_on_start_with_bootstrap_token() {
+    let key = test_key();
+    let pubkey = key.verifying_key().to_bytes().to_vec();
+    let bootstrap_token = Some("bootstrap-123".to_string());
+    let (transport, inbound_tx, mut outbound_rx) = make_transport();
+
+    let actor = UserAgentActor::spawn(UserAgentActor::new(key, bootstrap_token.clone(), transport));
+
+    let outbound = timeout(Duration::from_secs(1), outbound_rx.recv())
+        .await
+        .expect("timed out waiting for auth request")
+        .expect("channel closed before auth request");
+
+    let UserAgentRequest {
+        payload: Some(UserAgentRequestPayload::AuthChallengeRequest(req)),
+    } = outbound
+    else {
+        panic!("expected auth challenge request");
+    };
+
+    assert_eq!(req.pubkey, pubkey);
+    assert_eq!(req.bootstrap_token, bootstrap_token);
+
+    drop(inbound_tx);
+    drop(actor);
+}
+
+#[tokio::test]
+async fn challenge_flow_sends_solution_from_transport_inbound() {
+    let key = test_key();
+    let verify_key = key.verifying_key();
+    let (transport, inbound_tx, mut outbound_rx) = make_transport();
+
+    let actor = UserAgentActor::spawn(UserAgentActor::new(key, None, transport));
+
+    let _initial_auth_request = timeout(Duration::from_secs(1), outbound_rx.recv())
+        .await
+        .expect("timed out waiting for initial auth request")
+        .expect("missing initial auth request");
+
+    let challenge = AuthChallenge {
+        pubkey: verify_key.to_bytes().to_vec(),
+        nonce: 42,
+    };
+    inbound_tx
+        .send(UserAgentResponse {
+            payload: Some(UserAgentResponsePayload::AuthChallenge(challenge.clone())),
+        })
+        .await
+        .unwrap();
+
+    let outbound = timeout(Duration::from_secs(1), outbound_rx.recv())
+        .await
+        .expect("timed out waiting for challenge solution")
+        .expect("missing challenge solution");
+
+    let UserAgentRequest {
+        payload: Some(UserAgentRequestPayload::AuthChallengeSolution(solution)),
+    } = outbound
+    else {
+        panic!("expected auth challenge solution");
+    };
+
+    let formatted = format_challenge(challenge.nonce, &challenge.pubkey);
+    let sig: ed25519_dalek::Signature = solution
+        .signature
+        .as_slice()
+        .try_into()
+        .expect("signature bytes length");
+    verify_key
+        .verify_strict(&formatted, &sig)
+        .expect("solution signature should verify");
+
+    inbound_tx
+        .send(UserAgentResponse {
+            payload: Some(UserAgentResponsePayload::AuthOk(AuthOk {})),
+        })
+        .await
+        .unwrap();
+
+    drop(inbound_tx);
+    drop(actor);
+}
--- a/useragent/.dart_tool/extension_discovery/README.md
+++ b/useragent/.dart_tool/extension_discovery/README.md
@@ -0,0 +1,31 @@
+Extension Discovery Cache
+=========================
+
+This folder is used by `package:extension_discovery` to cache lists of
+packages that contains extensions for other packages.
+
+DO NOT USE THIS FOLDER
+----------------------
+
+ * Do not read (or rely) the contents of this folder.
+ * Do write to this folder.
+
+If you're interested in the lists of extensions stored in this folder use the
+API offered by package `extension_discovery` to get this information.
+
+If this package doesn't work for your use-case, then don't try to read the
+contents of this folder. It may change, and will not remain stable.
+
+Use package `extension_discovery`
+---------------------------------
+
+If you want to access information from this folder.
+
+Feel free to delete this folder
+-------------------------------
+
+Files in this folder act as a cache, and the cache is discarded if the files
+are older than the modification time of `.dart_tool/package_config.json`.
+
+Hence, it should never be necessary to clear this cache manually, if you find a
+need to do please file a bug.
--- a/useragent/.dart_tool/extension_discovery/vs_code.json
+++ b/useragent/.dart_tool/extension_discovery/vs_code.json
@@ -0,0 +1 @@
+{"version":2,"entries":[{"package":"arbiter","rootUri":"../","packageUri":"lib/"}]}
--- a/useragent/.dart_tool/package_config.json
+++ b/useragent/.dart_tool/package_config.json
@@ -0,0 +1,172 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "async",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/async-2.13.0",
+      "packageUri": "lib/",
+      "languageVersion": "3.4"
+    },
+    {
+      "name": "boolean_selector",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/boolean_selector-2.1.2",
+      "packageUri": "lib/",
+      "languageVersion": "3.1"
+    },
+    {
+      "name": "characters",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/characters-1.4.0",
+      "packageUri": "lib/",
+      "languageVersion": "3.4"
+    },
+    {
+      "name": "clock",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/clock-1.1.2",
+      "packageUri": "lib/",
+      "languageVersion": "3.4"
+    },
+    {
+      "name": "collection",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/collection-1.19.1",
+      "packageUri": "lib/",
+      "languageVersion": "3.4"
+    },
+    {
+      "name": "fake_async",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/fake_async-1.3.3",
+      "packageUri": "lib/",
+      "languageVersion": "3.3"
+    },
+    {
+      "name": "flutter",
+      "rootUri": "file:///Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable/packages/flutter",
+      "packageUri": "lib/",
+      "languageVersion": "3.8"
+    },
+    {
+      "name": "flutter_lints",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/flutter_lints-6.0.0",
+      "packageUri": "lib/",
+      "languageVersion": "3.8"
+    },
+    {
+      "name": "flutter_test",
+      "rootUri": "file:///Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable/packages/flutter_test",
+      "packageUri": "lib/",
+      "languageVersion": "3.8"
+    },
+    {
+      "name": "leak_tracker",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/leak_tracker-11.0.2",
+      "packageUri": "lib/",
+      "languageVersion": "3.2"
+    },
+    {
+      "name": "leak_tracker_flutter_testing",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/leak_tracker_flutter_testing-3.0.10",
+      "packageUri": "lib/",
+      "languageVersion": "3.2"
+    },
+    {
+      "name": "leak_tracker_testing",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/leak_tracker_testing-3.0.2",
+      "packageUri": "lib/",
+      "languageVersion": "3.2"
+    },
+    {
+      "name": "lints",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/lints-6.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "3.8"
+    },
+    {
+      "name": "matcher",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/matcher-0.12.17",
+      "packageUri": "lib/",
+      "languageVersion": "3.4"
+    },
+    {
+      "name": "material_color_utilities",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/material_color_utilities-0.11.1",
+      "packageUri": "lib/",
+      "languageVersion": "2.17"
+    },
+    {
+      "name": "meta",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/meta-1.17.0",
+      "packageUri": "lib/",
+      "languageVersion": "3.5"
+    },
+    {
+      "name": "path",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/path-1.9.1",
+      "packageUri": "lib/",
+      "languageVersion": "3.4"
+    },
+    {
+      "name": "sky_engine",
+      "rootUri": "file:///Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable/bin/cache/pkg/sky_engine",
+      "packageUri": "lib/",
+      "languageVersion": "3.8"
+    },
+    {
+      "name": "source_span",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/source_span-1.10.2",
+      "packageUri": "lib/",
+      "languageVersion": "3.1"
+    },
+    {
+      "name": "stack_trace",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/stack_trace-1.12.1",
+      "packageUri": "lib/",
+      "languageVersion": "3.4"
+    },
+    {
+      "name": "stream_channel",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/stream_channel-2.1.4",
+      "packageUri": "lib/",
+      "languageVersion": "3.3"
+    },
+    {
+      "name": "string_scanner",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/string_scanner-1.4.1",
+      "packageUri": "lib/",
+      "languageVersion": "3.1"
+    },
+    {
+      "name": "term_glyph",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/term_glyph-1.2.2",
+      "packageUri": "lib/",
+      "languageVersion": "3.1"
+    },
+    {
+      "name": "test_api",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/test_api-0.7.7",
+      "packageUri": "lib/",
+      "languageVersion": "3.5"
+    },
+    {
+      "name": "vector_math",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/vector_math-2.2.0",
+      "packageUri": "lib/",
+      "languageVersion": "3.1"
+    },
+    {
+      "name": "vm_service",
+      "rootUri": "file:///Users/kaska/.pub-cache/hosted/pub.dev/vm_service-15.0.2",
+      "packageUri": "lib/",
+      "languageVersion": "3.5"
+    },
+    {
+      "name": "arbiter",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "3.10"
+    }
+  ],
+  "generator": "pub",
+  "generatorVersion": "3.10.8",
+  "flutterRoot": "file:///Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable",
+  "flutterVersion": "3.38.9",
+  "pubCache": "file:///Users/kaska/.pub-cache"
+}
--- a/useragent/.dart_tool/package_graph.json
+++ b/useragent/.dart_tool/package_graph.json
@@ -0,0 +1,224 @@
+{
+  "roots": [
+    "arbiter"
+  ],
+  "packages": [
+    {
+      "name": "arbiter",
+      "version": "0.1.0",
+      "dependencies": [
+        "flutter"
+      ],
+      "devDependencies": [
+        "flutter_lints",
+        "flutter_test"
+      ]
+    },
+    {
+      "name": "flutter_lints",
+      "version": "6.0.0",
+      "dependencies": [
+        "lints"
+      ]
+    },
+    {
+      "name": "flutter_test",
+      "version": "0.0.0",
+      "dependencies": [
+        "clock",
+        "collection",
+        "fake_async",
+        "flutter",
+        "leak_tracker_flutter_testing",
+        "matcher",
+        "meta",
+        "path",
+        "stack_trace",
+        "stream_channel",
+        "test_api",
+        "vector_math"
+      ]
+    },
+    {
+      "name": "flutter",
+      "version": "0.0.0",
+      "dependencies": [
+        "characters",
+        "collection",
+        "material_color_utilities",
+        "meta",
+        "sky_engine",
+        "vector_math"
+      ]
+    },
+    {
+      "name": "lints",
+      "version": "6.1.0",
+      "dependencies": []
+    },
+    {
+      "name": "stream_channel",
+      "version": "2.1.4",
+      "dependencies": [
+        "async"
+      ]
+    },
+    {
+      "name": "meta",
+      "version": "1.17.0",
+      "dependencies": []
+    },
+    {
+      "name": "collection",
+      "version": "1.19.1",
+      "dependencies": []
+    },
+    {
+      "name": "leak_tracker_flutter_testing",
+      "version": "3.0.10",
+      "dependencies": [
+        "flutter",
+        "leak_tracker",
+        "leak_tracker_testing",
+        "matcher",
+        "meta"
+      ]
+    },
+    {
+      "name": "vector_math",
+      "version": "2.2.0",
+      "dependencies": []
+    },
+    {
+      "name": "stack_trace",
+      "version": "1.12.1",
+      "dependencies": [
+        "path"
+      ]
+    },
+    {
+      "name": "clock",
+      "version": "1.1.2",
+      "dependencies": []
+    },
+    {
+      "name": "fake_async",
+      "version": "1.3.3",
+      "dependencies": [
+        "clock",
+        "collection"
+      ]
+    },
+    {
+      "name": "path",
+      "version": "1.9.1",
+      "dependencies": []
+    },
+    {
+      "name": "matcher",
+      "version": "0.12.17",
+      "dependencies": [
+        "async",
+        "meta",
+        "stack_trace",
+        "term_glyph",
+        "test_api"
+      ]
+    },
+    {
+      "name": "test_api",
+      "version": "0.7.7",
+      "dependencies": [
+        "async",
+        "boolean_selector",
+        "collection",
+        "meta",
+        "source_span",
+        "stack_trace",
+        "stream_channel",
+        "string_scanner",
+        "term_glyph"
+      ]
+    },
+    {
+      "name": "sky_engine",
+      "version": "0.0.0",
+      "dependencies": []
+    },
+    {
+      "name": "material_color_utilities",
+      "version": "0.11.1",
+      "dependencies": [
+        "collection"
+      ]
+    },
+    {
+      "name": "characters",
+      "version": "1.4.0",
+      "dependencies": []
+    },
+    {
+      "name": "async",
+      "version": "2.13.0",
+      "dependencies": [
+        "collection",
+        "meta"
+      ]
+    },
+    {
+      "name": "leak_tracker_testing",
+      "version": "3.0.2",
+      "dependencies": [
+        "leak_tracker",
+        "matcher",
+        "meta"
+      ]
+    },
+    {
+      "name": "leak_tracker",
+      "version": "11.0.2",
+      "dependencies": [
+        "clock",
+        "collection",
+        "meta",
+        "path",
+        "vm_service"
+      ]
+    },
+    {
+      "name": "term_glyph",
+      "version": "1.2.2",
+      "dependencies": []
+    },
+    {
+      "name": "string_scanner",
+      "version": "1.4.1",
+      "dependencies": [
+        "source_span"
+      ]
+    },
+    {
+      "name": "source_span",
+      "version": "1.10.2",
+      "dependencies": [
+        "collection",
+        "path",
+        "term_glyph"
+      ]
+    },
+    {
+      "name": "boolean_selector",
+      "version": "2.1.2",
+      "dependencies": [
+        "source_span",
+        "string_scanner"
+      ]
+    },
+    {
+      "name": "vm_service",
+      "version": "15.0.2",
+      "dependencies": []
+    }
+  ],
+  "configVersion": 1
+}
--- a/useragent/.dart_tool/version
+++ b/useragent/.dart_tool/version
@@ -0,0 +1 @@
+3.38.9
--- a/useragent/macos/Flutter/ephemeral/Flutter-Generated.xcconfig
+++ b/useragent/macos/Flutter/ephemeral/Flutter-Generated.xcconfig
@@ -0,0 +1,11 @@
+// This is a generated file; do not edit or check into version control.
+FLUTTER_ROOT=/Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable
+FLUTTER_APPLICATION_PATH=/Users/kaska/Documents/Projects/Major/arbiter/useragent
+COCOAPODS_PARALLEL_CODE_SIGN=true
+FLUTTER_BUILD_DIR=build
+FLUTTER_BUILD_NAME=0.1.0
+FLUTTER_BUILD_NUMBER=0.1.0
+DART_OBFUSCATION=false
+TRACK_WIDGET_CREATION=true
+TREE_SHAKE_ICONS=false
+PACKAGE_CONFIG=.dart_tool/package_config.json
--- a/useragent/macos/Flutter/ephemeral/flutter_export_environment.sh
+++ b/useragent/macos/Flutter/ephemeral/flutter_export_environment.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+# This is a generated file; do not edit or check into version control.
+export "FLUTTER_ROOT=/Users/kaska/.local/share/mise/installs/flutter/3.38.9-stable"
+export "FLUTTER_APPLICATION_PATH=/Users/kaska/Documents/Projects/Major/arbiter/useragent"
+export "COCOAPODS_PARALLEL_CODE_SIGN=true"
+export "FLUTTER_BUILD_DIR=build"
+export "FLUTTER_BUILD_NAME=0.1.0"
+export "FLUTTER_BUILD_NUMBER=0.1.0"
+export "DART_OBFUSCATION=false"
+export "TRACK_WIDGET_CREATION=true"
+export "TREE_SHAKE_ICONS=false"
+export "PACKAGE_CONFIG=.dart_tool/package_config.json"
Author	SHA1	Message	Date
hdbg	cb05407bb6	feat(server): broker agent for inter-actor coordination Some checks failed ci/woodpecker/push/server-vet Pipeline failed Details ci/woodpecker/push/server-audit Pipeline was successful Details ci/woodpecker/push/server-lint Pipeline failed Details ci/woodpecker/push/server-test Pipeline was successful Details	2026-03-11 14:08:15 +01:00
Stas	4beb34764d	Merge pull request 'refactor(server::{user_agent, client}): move auth part to separate function to not to pollute actor session with one-time concerns' (#24 ) from push-upvpzwvlwyvs into main Reviewed-on: #24	2026-03-11 14:08:15 +01:00
hdbg	4b4a8f4489	refactor: consolidate auth messages into client and user_agent packages	2026-03-11 14:08:15 +01:00
hdbg	54d0fe0505	refactor(server::{user_agent, client}): move auth part to separate function to not to pollute `actor session` with one-time concerns	2026-03-11 14:08:15 +01:00
hdbg	06f4d628db	chore(server): update Cargo.lock dependencies	2026-03-11 14:08:15 +01:00
hdbg	657f47e32f	refactor(transport): convert Bi trait to use async_trait	2026-03-11 14:08:15 +01:00
hdbg	86f8feb291	tests(user-agent): basic auth tests similar to `server`	2026-03-11 14:07:46 +01:00
hdbg	6deec731e2	feat(useragent): initial connection impl	2026-03-11 14:07:46 +01:00
hdbg	f5a5c62181	refactor(transport): simplify converters	2026-03-11 14:07:46 +01:00
hdbg	b8afd94b21	refactor(transport): implemented `Bi` stream based abstraction for actor communication with `next` loop override	2026-03-11 14:07:46 +01:00
hdbg	7b57965952	housekeeping(useragent): rename	2026-03-11 14:07:06 +01:00
hdbg	9dca7aff27	feat(proto): add URL parsing and TLS certificate management	2026-03-11 14:07:06 +01:00
hdbg	4d1f047baf	misc: create license and readme	2026-03-11 14:05:42 +01:00
hdbg	925c7a211f	refactor(server): reogranized `actors`, `context`, and `db` modules into `<dir>/mod.rs` structure	2026-03-11 14:05:42 +01:00
hdbg	d81120f59c	refactor(server::tests): moved integration-like tests into `tests/`	2026-03-11 14:05:42 +01:00
hdbg	e118eceb85	refactor(server): separated global actors into their own handle	2026-03-11 14:05:42 +01:00
hdbg	4a84fe9339	refactor(server): actors reorganization & linter fixes	2026-03-11 14:05:42 +01:00
hdbg	c6e13dc476	feat(keyholder): add seal method and unseal integration tests	2026-03-11 14:05:42 +01:00
hdbg	8f5d4cc385	feat(server::user-agent): Unseal implemented	2026-03-11 14:05:42 +01:00
hdbg	2ffd60973d	test(keyholder): remove unused imports from test modules	2026-03-11 14:05:42 +01:00
hdbg	08af101b2e	fix(ci): add `protoc` installation for lints	2026-03-11 14:05:42 +01:00
hdbg	bb58868333	fix(ci): add clippy installation in mise.toml	2026-03-11 14:05:42 +01:00
hdbg	b05cdeec66	refactor(actors): rename BootstrapActor to Bootstrapper	2026-03-11 14:05:42 +01:00
hdbg	9ec465706a	chore(supply-chain): update cargo-vet audits and trusted publishers	2026-03-11 14:05:42 +01:00
hdbg	46a3c1768c	feat(server::key_holder): unique index on (root_key_id, nonce) to avoid nonce reuse	2026-03-11 14:05:42 +01:00
hdbg	6c8a67c520	feat(server::key_holder): ability to remotely get current state	2026-03-11 14:05:42 +01:00
hdbg	bbaed3fb97	refactor(keyholder): rename KeyHolderActor to KeyHolder and optimize db connection lifetime	2026-03-11 14:05:42 +01:00
hdbg	4700bc407e	security(server::key_holder): replaced nonce-caching with exclusive transaction fetching nonce from the database	2026-03-11 14:05:42 +01:00
hdbg	281fbcb31d	feat(server): `UserAgent` seal/unseal	2026-03-11 14:05:42 +01:00
hdbg	a55221573b	feat(unseal): add unseal protocol support for user agents	2026-03-11 14:03:46 +01:00
hdbg	45acb45a05	feat(server): boot mechanism	2026-03-11 14:03:46 +01:00
hdbg	11f1caa6da	ci: add server linting pipeline for Rust code quality checks	2026-03-11 14:03:46 +01:00
hdbg	f769c9119b	test(user-agent): add challenge-response auth flow test	2026-03-11 14:03:45 +01:00
hdbg	1145642255	tests(server): `UserAgent` invalid bootstrap token	2026-03-11 14:03:45 +01:00
hdbg	9f33277a4f	security(server): `cargo-vet` proper init	2026-03-11 14:03:45 +01:00
hdbg	0a8e1dce3f	housekeeping(server): trimmed-down dependencies	2026-03-11 14:03:45 +01:00
				`@@ -0,0 +1 @@`
				`{"version":2,"entries":[{"package":"app","rootUri":"../","packageUri":"lib/"}]}`
				`@@ -0,0 +1 @@`
				`{"version":2,"entries":[{"package":"arbiter","rootUri":"../","packageUri":"lib/"}]}`