feat(server): implement useragent_delete_grant hard delete cleanup

.woodpecker/server-compile.yaml

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

.woodpecker/server-test.yaml

@@ -24,4 +24,4 @@ steps:
       - mise install rust 
       - mise install protoc
       - mise install cargo:cargo-nextest
-      - mise exec cargo:cargo-nextest -- cargo nextest run --no-fail-fast
+      - mise exec cargo:cargo-nextest -- cargo nextest run --no-fail-fast --all-features

ARCHITECTURE.md

@@ -11,6 +11,7 @@ Arbiter distinguishes two kinds of peers:
 
 - **User Agent** — A client application used by the owner to manage the vault (create wallets, approve SDK clients, configure policies).
 - **SDK Client** — A consumer of signing capabilities, typically an automation tool. In the future, this could include a browser-based wallet.
+- **Recovery Operator** — A dormant recovery participant with narrowly scoped authority used only for custody recovery and operator replacement.
 
 ---
 
@@ -42,7 +43,149 @@ There is no bootstrap mechanism for SDK clients. They must be explicitly approve
 
 ---
 
-## 3. Server Identity
+## 3. Multi-Operator Governance
+
+When more than one User Agent is registered, the vault is treated as having multiple operators. In that mode, sensitive actions are governed by voting rather than by a single operator decision.
+
+### 3.1 Voting Rules
+
+Voting is based on the total number of registered operators:
+
+- **1 operator:** no vote is needed; the single operator decides directly.
+- **2 operators:** full consensus is required; both operators must approve.
+- **3 or more operators:** quorum is `floor(N / 2) + 1`.
+
+For a decision to count, the operator's approval or rejection must be signed by that operator's associated key. Unsigned votes, or votes that fail signature verification, are ignored.
+
+Examples:
+
+- **3 operators:** 2 approvals required
+- **4 operators:** 3 approvals required
+
+### 3.2 Actions Requiring a Vote
+
+In multi-operator mode, a successful vote is required for:
+
+- approving new SDK clients
+- granting an SDK client visibility to a wallet
+- approving a one-off transaction
+- approving creation of a persistent grant
+- approving operator replacement
+- approving server updates
+- updating Shamir secret-sharing parameters
+
+### 3.3 Special Rule for Key Rotation
+
+Key rotation always requires full quorum, regardless of the normal voting threshold.
+
+This is stricter than ordinary governance actions because rotating the root key requires every operator to participate in coordinated share refresh/update steps. The root key itself is not redistributed directly, but each operator's share material must be changed consistently.
+
+### 3.4 Root Key Custody
+
+When the vault has multiple operators, the vault root key is protected using Shamir secret sharing.
+
+The vault root key is encrypted in a way that requires reconstruction from user-held shares rather than from a single shared password.
+
+For ordinary operators, the Shamir threshold matches the ordinary governance quorum. For example:
+
+- **2 operators:** `2-of-2`
+- **3 operators:** `2-of-3`
+- **4 operators:** `3-of-4`
+
+In practice, the Shamir share set also includes Recovery Operator shares. This means the effective Shamir parameters are computed over the combined share pool while keeping the same threshold. For example:
+
+- **3 ordinary operators + 2 recovery shares:** `2-of-5`
+
+This ensures that the normal custody threshold follows the ordinary operator quorum, while still allowing dormant recovery shares to exist for break-glass recovery flows.
+
+### 3.5 Recovery Operators
+
+Recovery Operators are a separate peer type from ordinary vault operators.
+
+Their role is intentionally narrow. They can only:
+
+- participate in unsealing the vault
+- vote for operator replacement
+
+Recovery Operators do not participate in routine governance such as approving SDK clients, granting wallet visibility, approving transactions, creating grants, approving server updates, or changing Shamir parameters.
+
+### 3.6 Sleeping and Waking Recovery Operators
+
+By default, Recovery Operators are **sleeping** and do not participate in any active flow.
+
+Any ordinary operator may request that Recovery Operators **wake up**.
+
+Any ordinary operator may also cancel a pending wake-up request.
+
+This creates a dispute window before recovery powers become active. The default wake-up delay is **14 days**.
+
+Recovery Operators are therefore part of the break-glass recovery path rather than the normal operating quorum.
+
+The high-level recovery flow is:
+
+```mermaid
+sequenceDiagram
+    autonumber
+    actor Op as Ordinary Operator
+    participant Server
+    actor Other as Other Operator
+    actor Rec as Recovery Operator
+
+    Op->>Server: Request recovery wake-up
+    Server-->>Op: Wake-up pending
+    Note over Server: Default dispute window: 14 days
+
+    alt Wake-up cancelled during dispute window
+        Other->>Server: Cancel wake-up
+        Server-->>Op: Recovery cancelled
+        Server-->>Rec: Stay sleeping
+    else No cancellation for 14 days
+        Server-->>Rec: Wake up
+        Rec->>Server: Join recovery flow
+        critical Recovery authority
+            Rec->>Server: Participate in unseal
+            Rec->>Server: Vote on operator replacement
+        end
+        Server-->>Op: Recovery mode active
+    end
+```
+
+### 3.7 Committee Formation
+
+There are two ways to form a multi-operator committee:
+
+- convert an existing single-operator vault by adding new operators
+- bootstrap an unbootstrapped vault directly into multi-operator mode
+
+In both cases, committee formation is a coordinated process. Arbiter does not allow multi-operator custody to emerge implicitly from unrelated registrations.
+
+### 3.8 Bootstrapping an Unbootstrapped Vault into Multi-Operator Mode
+
+When an unbootstrapped vault is initialized as a multi-operator vault, the setup proceeds as follows:
+
+1. An operator connects to the unbootstrapped vault using a User Agent and the bootstrap token.
+2. During bootstrap setup, that operator declares:
+   - the total number of ordinary operators
+   - the total number of Recovery Operators
+3. The vault enters **multi-bootstrap mode**.
+4. While in multi-bootstrap mode:
+   - every ordinary operator must connect with a User Agent using the bootstrap token
+   - every Recovery Operator must also connect using the bootstrap token
+   - each participant is registered individually
+   - each participant's share is created and protected with that participant's credentials
+5. The vault is considered fully bootstrapped only after all declared operator and recovery-share registrations have completed successfully.
+
+This means the operator and recovery set is fixed at bootstrap completion time, based on the counts declared when multi-bootstrap mode was entered.
+
+### 3.9 Special Bootstrap Constraint for Two-Operator Vaults
+
+If a vault is declared with exactly **2 ordinary operators**, Arbiter requires at least **1 Recovery Operator** to be configured during bootstrap.
+
+This prevents the worst-case custody failure in which a `2-of-2` operator set becomes permanently unrecoverable after loss of a single operator.
+
+---
+
+## 4. Server Identity
 
 The server proves its identity using TLS with a self-signed certificate. The TLS private key is generated on first run and is long-term; no rotation mechanism exists yet due to the complexity of multi-peer coordination.
 
@@ -55,9 +198,9 @@ Peers verify the server by its **public key fingerprint**:
 
 ---
 
-## 4. Key Management
+## 5. Key Management
 
-### 4.1 Key Hierarchy
+### 5.1 Key Hierarchy
 
 There are three layers of keys:
 
@@ -72,19 +215,19 @@ This layered design enables:
 - **Password rotation** without re-encrypting every wallet key (only the root key is re-encrypted).
 - **Root key rotation** without requiring the user to change their password.
 
-### 4.2 Encryption at Rest
+### 5.2 Encryption at Rest
 
 The database stores everything in encrypted form using symmetric AEAD. The encryption scheme is versioned to support transparent migration — when the vault unseals, Arbiter automatically re-encrypts any entries that are behind the current scheme version. See [IMPLEMENTATION.md](IMPLEMENTATION.md) for the specific scheme and versioning mechanism.
 
 ---
 
-## 5. Vault Lifecycle
+## 6. Vault Lifecycle
 
-### 5.1 Sealed State
+### 6.1 Sealed State
 
 On boot, the root key is encrypted and the server cannot perform any signing operations. This state is called **Sealed**.
 
-### 5.2 Unseal Flow
+### 6.2 Unseal Flow
 
 To transition to the **Unsealed** state, a User Agent must provide the password:
 
@@ -95,7 +238,7 @@ To transition to the **Unsealed** state, a User Agent must provide the password:
    - **Success:** The root key is decrypted and placed into a hardened memory cell. The server transitions to `Unsealed`. Any entries pending encryption scheme migration are re-encrypted.
    - **Failure:** The server returns an error indicating the password is incorrect.
 
-### 5.3 Memory Protection
+### 6.3 Memory Protection
 
 Once unsealed, the root key must be protected in memory against:
 
@@ -107,9 +250,9 @@ See [IMPLEMENTATION.md](IMPLEMENTATION.md) for the current and planned memory pr
 
 ---
 
-## 6. Permission Engine
+## 7. Permission Engine
 
-### 6.1 Fundamental Rules
+### 7.1 Fundamental Rules
 
 - SDK clients have **no access by default**.
 - Access is granted **explicitly** by a User Agent.
@@ -119,11 +262,45 @@ Each blockchain requires its own policy system due to differences in static tran
 
 Arbiter is also responsible for ensuring that **transaction nonces are never reused**.
 
-### 6.2 EVM Policies
+### 7.2 EVM Policies
 
 Every EVM grant is scoped to a specific **wallet** and **chain ID**.
 
-#### 6.2.1 Transaction Sub-Grants
+#### 7.2.0 Transaction Signing Sequence
+
+The high-level interaction order is:
+
+```mermaid
+sequenceDiagram
+    autonumber
+    actor SDK as SDK Client
+    participant Server
+    participant UA as User Agent
+
+    SDK->>Server: SignTransactionRequest
+    Server->>Server: Resolve wallet and wallet visibility
+    alt Visibility approval required
+        Server->>UA: Ask for wallet visibility approval
+        UA-->>Server: Vote result
+    end
+    Server->>Server: Evaluate transaction
+    Server->>Server: Load grant and limits context
+    alt Grant approval required
+        Server->>UA: Ask for execution / grant approval
+        UA-->>Server: Vote result
+        opt Create persistent grant
+            Server->>Server: Create and store grant
+        end
+        Server->>Server: Retry evaluation
+    end
+    critical Final authorization path
+        Server->>Server: Check limits and record execution
+        Server-->>Server: Signature or evaluation error
+    end
+    Server-->>SDK: Signature or error
+```
+
+#### 7.2.1 Transaction Sub-Grants
 
 Arbiter maintains an ever-expanding database of known contracts and their ABIs. Based on contract knowledge, transaction requests fall into three categories:
 
@@ -147,9 +324,9 @@ Available restrictions:
 
 These transactions have no `calldata` and therefore cannot interact with contracts. They can be subject to the same volume and rate restrictions as above.
 
-#### 6.2.2 Global Limits
+#### 7.2.2 Global Limits
 
 In addition to sub-grant-specific restrictions, the following limits can be applied across all grant types:
 
 - **Gas limit** — Maximum gas per transaction.
-- **Time-window restrictions** — e.g., signing allowed only 08:00–20:00 on Mondays and Thursdays.
+- **Time-window restrictions** — e.g., signing allowed only 08:00–20:00 on Mondays and Thursdays.

IMPLEMENTATION.md

@@ -128,6 +128,52 @@ The central abstraction is the `Policy` trait. Each implementation handles one s
 4. **Evaluate** — `Policy::evaluate` checks the decoded meaning against the grant's policy-specific constraints and returns any violations.
 5. **Record** — If `RunKind::Execution` and there are no violations, the engine writes to `evm_transaction_log` and calls `Policy::record_transaction` for any policy-specific logging (e.g., token transfer volume).
 
+The detailed branch structure is shown below:
+
+```mermaid
+flowchart TD
+    A[SDK Client sends sign transaction request] --> B[Server resolves wallet]
+    B --> C{Wallet exists?}
+
+    C -- No --> Z1[Return wallet not found error]
+    C -- Yes --> D[Check SDK client wallet visibility]
+
+    D --> E{Wallet visible to SDK client?}
+    E -- No --> F[Start wallet visibility voting flow]
+    F --> G{Vote approved?}
+    G -- No --> Z2[Return wallet access denied error]
+    G -- Yes --> H[Persist wallet visibility]
+    E -- Yes --> I[Classify transaction meaning]
+    H --> I
+
+    I --> J{Meaning supported?}
+    J -- No --> Z3[Return unsupported transaction error]
+    J -- Yes --> K[Find matching grant]
+
+    K --> L{Grant exists?}
+    L -- Yes --> M[Check grant limits]
+    L -- No --> N[Start execution or grant voting flow]
+
+    N --> O{User-agent decision}
+    O -- Reject --> Z4[Return no matching grant error]
+    O -- Allow once --> M
+    O -- Create grant --> P[Create grant with user-selected limits]
+    P --> Q[Persist grant]
+    Q --> M
+
+    M --> R{Limits exceeded?}
+    R -- Yes --> Z5[Return evaluation error]
+    R -- No --> S[Record transaction in logs]
+    S --> T[Produce signature]
+    T --> U[Return signature to SDK client]
+
+    note1[Limit checks include volume, count, and gas constraints.]
+    note2[Grant lookup depends on classified meaning, such as ether transfer or token transfer.]
+
+    K -. uses .-> note2
+    M -. checks .-> note1
+```
+
 ### Policy Trait
 
 | Method | Purpose |

docs/superpowers/plans/2026-03-28-grant-grid-view.md

@@ -0,0 +1,821 @@
+# Grant Grid View Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add an "EVM Grants" dashboard tab that displays all grants as enriched cards (type, chain, wallet address, client name) with per-card revoke support.
+
+**Architecture:** A new `walletAccessListProvider` fetches wallet accesses with their DB row IDs. The screen (`grants.dart`) watches only `evmGrantsProvider` for top-level state. Each `GrantCard` widget (its own file) watches enrichment providers (`walletAccessListProvider`, `evmProvider`, `sdkClientsProvider`) and the revoke mutation directly — keeping rebuilds scoped to the card. The screen is registered as a dashboard tab in `AdaptiveScaffold`.
+
+**Tech Stack:** Flutter, Riverpod (`riverpod_annotation` + `build_runner` codegen), `sizer` (adaptive sizing), `auto_route`, Protocol Buffers (Dart), `Palette` design tokens.
+
+---
+
+## File Map
+
+| File | Action | Responsibility |
+|---|---|---|
+| `useragent/lib/theme/palette.dart` | Modify | Add `Palette.token` (indigo accent for token-transfer cards) |
+| `useragent/lib/features/connection/evm/wallet_access.dart` | Modify | Add `listAllWalletAccesses()` function |
+| `useragent/lib/providers/sdk_clients/wallet_access_list.dart` | Create | `WalletAccessListProvider` — fetches full wallet access list with IDs |
+| `useragent/lib/screens/dashboard/evm/grants/widgets/grant_card.dart` | Create | `GrantCard` widget — watches enrichment providers + revoke mutation; one card per grant |
+| `useragent/lib/screens/dashboard/evm/grants/grants.dart` | Create | `EvmGrantsScreen` — watches `evmGrantsProvider`; handles loading/error/empty/data states; renders `GrantCard` list |
+| `useragent/lib/router.dart` | Modify | Register `EvmGrantsRoute` in dashboard children |
+| `useragent/lib/screens/dashboard.dart` | Modify | Add Grants entry to `routes` list and `NavigationDestination` list |
+
+---
+
+## Task 1: Add `Palette.token`
+
+**Files:**
+- Modify: `useragent/lib/theme/palette.dart`
+
+- [ ] **Step 1: Add the color**
+
+Replace the contents of `useragent/lib/theme/palette.dart` with:
+
+```dart
+import 'package:flutter/material.dart';
+
+class Palette {
+  static const ink = Color(0xFF15263C);
+  static const coral = Color(0xFFE26254);
+  static const cream = Color(0xFFFFFAF4);
+  static const line = Color(0x1A15263C);
+  static const token = Color(0xFF5C6BC0);
+}
+```
+
+- [ ] **Step 2: Verify**
+
+```sh
+cd useragent && flutter analyze lib/theme/palette.dart
+```
+
+Expected: no issues.
+
+- [ ] **Step 3: Commit**
+
+```sh
+jj describe -m "feat(theme): add Palette.token for token-transfer grant cards"
+jj new
+```
+
+---
+
+## Task 2: Add `listAllWalletAccesses` feature function
+
+**Files:**
+- Modify: `useragent/lib/features/connection/evm/wallet_access.dart`
+
+`readClientWalletAccess` (existing) filters the list to one client's wallet IDs and returns `Set<int>`. This new function returns the complete unfiltered list with row IDs so the grant cards can resolve wallet_access_id → wallet + client.
+
+- [ ] **Step 1: Append function**
+
+Add at the bottom of `useragent/lib/features/connection/evm/wallet_access.dart`:
+
+```dart
+Future<List<SdkClientWalletAccess>> listAllWalletAccesses(
+  Connection connection,
+) async {
+  final response = await connection.ask(
+    UserAgentRequest(listWalletAccess: Empty()),
+  );
+  if (!response.hasListWalletAccessResponse()) {
+    throw Exception(
+      'Expected list wallet access response, got ${response.whichPayload()}',
+    );
+  }
+  return response.listWalletAccessResponse.accesses.toList(growable: false);
+}
+```
+
+Each returned `SdkClientWalletAccess` has:
+- `.id` — the `evm_wallet_access` row ID (same value as `wallet_access_id` in a `GrantEntry`)
+- `.access.walletId` — the EVM wallet DB ID
+- `.access.sdkClientId` — the SDK client DB ID
+
+- [ ] **Step 2: Verify**
+
+```sh
+cd useragent && flutter analyze lib/features/connection/evm/wallet_access.dart
+```
+
+Expected: no issues.
+
+- [ ] **Step 3: Commit**
+
+```sh
+jj describe -m "feat(evm): add listAllWalletAccesses feature function"
+jj new
+```
+
+---
+
+## Task 3: Create `WalletAccessListProvider`
+
+**Files:**
+- Create: `useragent/lib/providers/sdk_clients/wallet_access_list.dart`
+- Generated: `useragent/lib/providers/sdk_clients/wallet_access_list.g.dart`
+
+Mirrors the structure of `EvmGrants` in `providers/evm/evm_grants.dart` — class-based `@riverpod` with a `refresh()` method.
+
+- [ ] **Step 1: Write the provider**
+
+Create `useragent/lib/providers/sdk_clients/wallet_access_list.dart`:
+
+```dart
+import 'package:arbiter/features/connection/evm/wallet_access.dart';
+import 'package:arbiter/proto/user_agent.pb.dart';
+import 'package:arbiter/providers/connection/connection_manager.dart';
+import 'package:mtcore/markettakers.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'wallet_access_list.g.dart';
+
+@riverpod
+class WalletAccessList extends _$WalletAccessList {
+  @override
+  Future<List<SdkClientWalletAccess>?> build() async {
+    final connection = await ref.watch(connectionManagerProvider.future);
+    if (connection == null) {
+      return null;
+    }
+
+    try {
+      return await listAllWalletAccesses(connection);
+    } catch (e, st) {
+      talker.handle(e, st);
+      rethrow;
+    }
+  }
+
+  Future<void> refresh() async {
+    final connection = await ref.read(connectionManagerProvider.future);
+    if (connection == null) {
+      state = const AsyncData(null);
+      return;
+    }
+
+    state = const AsyncLoading();
+    state = await AsyncValue.guard(() => listAllWalletAccesses(connection));
+  }
+}
+```
+
+- [ ] **Step 2: Run code generation**
+
+```sh
+cd useragent && dart run build_runner build --delete-conflicting-outputs
+```
+
+Expected: `useragent/lib/providers/sdk_clients/wallet_access_list.g.dart` created. No errors.
+
+- [ ] **Step 3: Verify**
+
+```sh
+cd useragent && flutter analyze lib/providers/sdk_clients/
+```
+
+Expected: no issues.
+
+- [ ] **Step 4: Commit**
+
+```sh
+jj describe -m "feat(providers): add WalletAccessListProvider"
+jj new
+```
+
+---
+
+## Task 4: Create `GrantCard` widget
+
+**Files:**
+- Create: `useragent/lib/screens/dashboard/evm/grants/widgets/grant_card.dart`
+
+This widget owns all per-card logic: enrichment lookups, revoke action, and rebuild scope. The screen only passes it a `GrantEntry` — the card fetches everything else itself.
+
+**Key types:**
+- `GrantEntry` (from `proto/evm.pb.dart`): `.id`, `.shared.walletAccessId`, `.shared.chainId`, `.specific.whichGrant()`
+- `SpecificGrant_Grant.etherTransfer` / `.tokenTransfer` — enum values for the oneof
+- `SdkClientWalletAccess` (from `proto/user_agent.pb.dart`): `.id`, `.access.walletId`, `.access.sdkClientId`
+- `WalletEntry` (from `proto/evm.pb.dart`): `.id`, `.address` (List<int>)
+- `SdkClientEntry` (from `proto/user_agent.pb.dart`): `.id`, `.info.name`
+- `revokeEvmGrantMutation` — `Mutation<void>` (global; all revoke buttons disable together while any revoke is in flight)
+- `executeRevokeEvmGrant(ref, grantId: int)` — `Future<void>`
+
+- [ ] **Step 1: Write the widget**
+
+Create `useragent/lib/screens/dashboard/evm/grants/widgets/grant_card.dart`:
+
+```dart
+import 'package:arbiter/proto/evm.pb.dart';
+import 'package:arbiter/proto/user_agent.pb.dart';
+import 'package:arbiter/providers/evm/evm.dart';
+import 'package:arbiter/providers/evm/evm_grants.dart';
+import 'package:arbiter/providers/sdk_clients/list.dart';
+import 'package:arbiter/providers/sdk_clients/wallet_access_list.dart';
+import 'package:arbiter/theme/palette.dart';
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/experimental/mutation.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:sizer/sizer.dart';
+
+String _shortAddress(List<int> bytes) {
+  final hex = bytes.map((b) => b.toRadixString(16).padLeft(2, '0')).join();
+  return '0x${hex.substring(0, 6)}...${hex.substring(hex.length - 4)}';
+}
+
+String _formatError(Object error) {
+  final message = error.toString();
+  if (message.startsWith('Exception: ')) {
+    return message.substring('Exception: '.length);
+  }
+  return message;
+}
+
+class GrantCard extends ConsumerWidget {
+  const GrantCard({super.key, required this.grant});
+
+  final GrantEntry grant;
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    // Enrichment lookups — each watch scopes rebuilds to this card only
+    final walletAccesses =
+        ref.watch(walletAccessListProvider).asData?.value ?? const [];
+    final wallets = ref.watch(evmProvider).asData?.value ?? const [];
+    final clients = ref.watch(sdkClientsProvider).asData?.value ?? const [];
+    final revoking = ref.watch(revokeEvmGrantMutation) is MutationPending;
+
+    final isEther =
+        grant.specific.whichGrant() == SpecificGrant_Grant.etherTransfer;
+    final accent = isEther ? Palette.coral : Palette.token;
+    final typeLabel = isEther ? 'Ether' : 'Token';
+    final theme = Theme.of(context);
+    final muted = Palette.ink.withValues(alpha: 0.62);
+
+    // Resolve wallet_access_id → wallet address + client name
+    final accessById = <int, SdkClientWalletAccess>{
+      for (final a in walletAccesses) a.id: a,
+    };
+    final walletById = <int, WalletEntry>{
+      for (final w in wallets) w.id: w,
+    };
+    final clientNameById = <int, String>{
+      for (final c in clients) c.id: c.info.name,
+    };
+
+    final accessId = grant.shared.walletAccessId;
+    final access = accessById[accessId];
+    final wallet = access != null ? walletById[access.access.walletId] : null;
+
+    final walletLabel = wallet != null
+        ? _shortAddress(wallet.address)
+        : 'Access #$accessId';
+
+    final clientLabel = () {
+      if (access == null) return '';
+      final name = clientNameById[access.access.sdkClientId] ?? '';
+      return name.isEmpty ? 'Client #${access.access.sdkClientId}' : name;
+    }();
+
+    void showError(String message) {
+      if (!context.mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text(message), behavior: SnackBarBehavior.floating),
+      );
+    }
+
+    Future<void> revoke() async {
+      try {
+        await executeRevokeEvmGrant(ref, grantId: grant.id);
+      } catch (e) {
+        showError(_formatError(e));
+      }
+    }
+
+    return Container(
+      decoration: BoxDecoration(
+        borderRadius: BorderRadius.circular(24),
+        color: Palette.cream.withValues(alpha: 0.92),
+        border: Border.all(color: Palette.line),
+      ),
+      child: IntrinsicHeight(
+        child: Row(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            // Accent strip
+            Container(
+              width: 0.8.w,
+              decoration: BoxDecoration(
+                color: accent,
+                borderRadius: const BorderRadius.horizontal(
+                  left: Radius.circular(24),
+                ),
+              ),
+            ),
+            // Card body
+            Expanded(
+              child: Padding(
+                padding: EdgeInsets.symmetric(
+                  horizontal: 1.6.w,
+                  vertical: 1.4.h,
+                ),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    // Row 1: type badge · chain · spacer · revoke button
+                    Row(
+                      children: [
+                        Container(
+                          padding: EdgeInsets.symmetric(
+                            horizontal: 1.w,
+                            vertical: 0.4.h,
+                          ),
+                          decoration: BoxDecoration(
+                            color: accent.withValues(alpha: 0.15),
+                            borderRadius: BorderRadius.circular(8),
+                          ),
+                          child: Text(
+                            typeLabel,
+                            style: theme.textTheme.labelSmall?.copyWith(
+                              color: accent,
+                              fontWeight: FontWeight.w800,
+                            ),
+                          ),
+                        ),
+                        SizedBox(width: 1.w),
+                        Container(
+                          padding: EdgeInsets.symmetric(
+                            horizontal: 1.w,
+                            vertical: 0.4.h,
+                          ),
+                          decoration: BoxDecoration(
+                            color: Palette.ink.withValues(alpha: 0.06),
+                            borderRadius: BorderRadius.circular(8),
+                          ),
+                          child: Text(
+                            'Chain ${grant.shared.chainId}',
+                            style: theme.textTheme.labelSmall?.copyWith(
+                              color: muted,
+                              fontWeight: FontWeight.w700,
+                            ),
+                          ),
+                        ),
+                        const Spacer(),
+                        if (revoking)
+                          SizedBox(
+                            width: 1.8.h,
+                            height: 1.8.h,
+                            child: CircularProgressIndicator(
+                              strokeWidth: 2,
+                              color: Palette.coral,
+                            ),
+                          )
+                        else
+                          OutlinedButton.icon(
+                            onPressed: revoke,
+                            style: OutlinedButton.styleFrom(
+                              foregroundColor: Palette.coral,
+                              side: BorderSide(
+                                color: Palette.coral.withValues(alpha: 0.4),
+                              ),
+                              padding: EdgeInsets.symmetric(
+                                horizontal: 1.w,
+                                vertical: 0.6.h,
+                              ),
+                              shape: RoundedRectangleBorder(
+                                borderRadius: BorderRadius.circular(10),
+                              ),
+                            ),
+                            icon: const Icon(Icons.block_rounded, size: 16),
+                            label: const Text('Revoke'),
+                          ),
+                      ],
+                    ),
+                    SizedBox(height: 0.8.h),
+                    // Row 2: wallet address · client name
+                    Row(
+                      children: [
+                        Text(
+                          walletLabel,
+                          style: theme.textTheme.bodySmall?.copyWith(
+                            color: Palette.ink,
+                            fontFamily: 'monospace',
+                          ),
+                        ),
+                        Padding(
+                          padding: EdgeInsets.symmetric(horizontal: 0.8.w),
+                          child: Text(
+                            '·',
+                            style: theme.textTheme.bodySmall
+                                ?.copyWith(color: muted),
+                          ),
+                        ),
+                        Expanded(
+                          child: Text(
+                            clientLabel,
+                            maxLines: 1,
+                            overflow: TextOverflow.ellipsis,
+                            style: theme.textTheme.bodySmall
+                                ?.copyWith(color: muted),
+                          ),
+                        ),
+                      ],
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+```
+
+- [ ] **Step 2: Verify**
+
+```sh
+cd useragent && flutter analyze lib/screens/dashboard/evm/grants/widgets/grant_card.dart
+```
+
+Expected: no issues.
+
+- [ ] **Step 3: Commit**
+
+```sh
+jj describe -m "feat(grants): add GrantCard widget with self-contained enrichment"
+jj new
+```
+
+---
+
+## Task 5: Create `EvmGrantsScreen`
+
+**Files:**
+- Create: `useragent/lib/screens/dashboard/evm/grants/grants.dart`
+
+The screen watches only `evmGrantsProvider` for top-level state (loading / error / no connection / empty / data). When there is data it renders a list of `GrantCard` widgets — each card manages its own enrichment subscriptions.
+
+- [ ] **Step 1: Write the screen**
+
+Create `useragent/lib/screens/dashboard/evm/grants/grants.dart`:
+
+```dart
+import 'package:arbiter/proto/evm.pb.dart';
+import 'package:arbiter/providers/evm/evm_grants.dart';
+import 'package:arbiter/providers/sdk_clients/wallet_access_list.dart';
+import 'package:arbiter/router.gr.dart';
+import 'package:arbiter/screens/dashboard/evm/grants/widgets/grant_card.dart';
+import 'package:arbiter/theme/palette.dart';
+import 'package:arbiter/widgets/page_header.dart';
+import 'package:auto_route/auto_route.dart';
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:sizer/sizer.dart';
+
+String _formatError(Object error) {
+  final message = error.toString();
+  if (message.startsWith('Exception: ')) {
+    return message.substring('Exception: '.length);
+  }
+  return message;
+}
+
+// ─── State panel ──────────────────────────────────────────────────────────────
+
+class _StatePanel extends StatelessWidget {
+  const _StatePanel({
+    required this.icon,
+    required this.title,
+    required this.body,
+    this.actionLabel,
+    this.onAction,
+    this.busy = false,
+  });
+
+  final IconData icon;
+  final String title;
+  final String body;
+  final String? actionLabel;
+  final Future<void> Function()? onAction;
+  final bool busy;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    return Container(
+      decoration: BoxDecoration(
+        borderRadius: BorderRadius.circular(24),
+        color: Palette.cream.withValues(alpha: 0.92),
+        border: Border.all(color: Palette.line),
+      ),
+      child: Padding(
+        padding: EdgeInsets.all(2.8.h),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            if (busy)
+              SizedBox(
+                width: 2.8.h,
+                height: 2.8.h,
+                child: const CircularProgressIndicator(strokeWidth: 2.5),
+              )
+            else
+              Icon(icon, size: 34, color: Palette.coral),
+            SizedBox(height: 1.8.h),
+            Text(
+              title,
+              style: theme.textTheme.headlineSmall?.copyWith(
+                color: Palette.ink,
+                fontWeight: FontWeight.w800,
+              ),
+            ),
+            SizedBox(height: 1.h),
+            Text(
+              body,
+              style: theme.textTheme.bodyLarge?.copyWith(
+                color: Palette.ink.withValues(alpha: 0.72),
+                height: 1.5,
+              ),
+            ),
+            if (actionLabel != null && onAction != null) ...[
+              SizedBox(height: 2.h),
+              OutlinedButton.icon(
+                onPressed: () => onAction!(),
+                icon: const Icon(Icons.refresh),
+                label: Text(actionLabel!),
+              ),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+// ─── Grant list ───────────────────────────────────────────────────────────────
+
+class _GrantList extends StatelessWidget {
+  const _GrantList({required this.grants});
+
+  final List<GrantEntry> grants;
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        for (var i = 0; i < grants.length; i++)
+          Padding(
+            padding: EdgeInsets.only(
+              bottom: i == grants.length - 1 ? 0 : 1.8.h,
+            ),
+            child: GrantCard(grant: grants[i]),
+          ),
+      ],
+    );
+  }
+}
+
+// ─── Screen ───────────────────────────────────────────────────────────────────
+
+@RoutePage()
+class EvmGrantsScreen extends ConsumerWidget {
+  const EvmGrantsScreen({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    // Screen watches only the grant list for top-level state decisions
+    final grantsAsync = ref.watch(evmGrantsProvider);
+
+    Future<void> refresh() async {
+      await Future.wait([
+        ref.read(evmGrantsProvider.notifier).refresh(),
+        ref.read(walletAccessListProvider.notifier).refresh(),
+      ]);
+    }
+
+    void showMessage(String message) {
+      if (!context.mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text(message), behavior: SnackBarBehavior.floating),
+      );
+    }
+
+    Future<void> safeRefresh() async {
+      try {
+        await refresh();
+      } catch (e) {
+        showMessage(_formatError(e));
+      }
+    }
+
+    final grantsState = grantsAsync.asData?.value;
+    final grants = grantsState?.grants;
+
+    final content = switch (grantsAsync) {
+      AsyncLoading() when grantsState == null => const _StatePanel(
+        icon: Icons.hourglass_top,
+        title: 'Loading grants',
+        body: 'Pulling grant registry from Arbiter.',
+        busy: true,
+      ),
+      AsyncError(:final error) => _StatePanel(
+        icon: Icons.sync_problem,
+        title: 'Grant registry unavailable',
+        body: _formatError(error),
+        actionLabel: 'Retry',
+        onAction: safeRefresh,
+      ),
+      AsyncData(:final value) when value == null => _StatePanel(
+        icon: Icons.portable_wifi_off,
+        title: 'No active server connection',
+        body: 'Reconnect to Arbiter to list EVM grants.',
+        actionLabel: 'Refresh',
+        onAction: safeRefresh,
+      ),
+      _ when grants != null && grants.isEmpty => _StatePanel(
+        icon: Icons.policy_outlined,
+        title: 'No grants yet',
+        body: 'Create a grant to allow SDK clients to sign transactions.',
+        actionLabel: 'Create grant',
+        onAction: () => context.router.push(const CreateEvmGrantRoute()),
+      ),
+      _ => _GrantList(grants: grants ?? const []),
+    };
+
+    return Scaffold(
+      body: SafeArea(
+        child: RefreshIndicator.adaptive(
+          color: Palette.ink,
+          backgroundColor: Colors.white,
+          onRefresh: safeRefresh,
+          child: ListView(
+            physics: const BouncingScrollPhysics(
+              parent: AlwaysScrollableScrollPhysics(),
+            ),
+            padding: EdgeInsets.fromLTRB(2.4.w, 2.4.h, 2.4.w, 3.2.h),
+            children: [
+              PageHeader(
+                title: 'EVM Grants',
+                isBusy: grantsAsync.isLoading,
+                actions: [
+                  FilledButton.icon(
+                    onPressed: () =>
+                        context.router.push(const CreateEvmGrantRoute()),
+                    icon: const Icon(Icons.add_rounded),
+                    label: const Text('Create grant'),
+                  ),
+                  SizedBox(width: 1.w),
+                  OutlinedButton.icon(
+                    onPressed: safeRefresh,
+                    style: OutlinedButton.styleFrom(
+                      foregroundColor: Palette.ink,
+                      side: BorderSide(color: Palette.line),
+                      padding: EdgeInsets.symmetric(
+                        horizontal: 1.4.w,
+                        vertical: 1.2.h,
+                      ),
+                      shape: RoundedRectangleBorder(
+                        borderRadius: BorderRadius.circular(14),
+                      ),
+                    ),
+                    icon: const Icon(Icons.refresh, size: 18),
+                    label: const Text('Refresh'),
+                  ),
+                ],
+              ),
+              SizedBox(height: 1.8.h),
+              content,
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+```
+
+- [ ] **Step 2: Verify**
+
+```sh
+cd useragent && flutter analyze lib/screens/dashboard/evm/grants/
+```
+
+Expected: no issues.
+
+- [ ] **Step 3: Commit**
+
+```sh
+jj describe -m "feat(grants): add EvmGrantsScreen"
+jj new
+```
+
+---
+
+## Task 6: Wire router and dashboard tab
+
+**Files:**
+- Modify: `useragent/lib/router.dart`
+- Modify: `useragent/lib/screens/dashboard.dart`
+- Regenerated: `useragent/lib/router.gr.dart`
+
+- [ ] **Step 1: Add route to `router.dart`**
+
+Replace the contents of `useragent/lib/router.dart` with:
+
+```dart
+import 'package:auto_route/auto_route.dart';
+
+import 'router.gr.dart';
+
+@AutoRouterConfig(generateForDir: ['lib/screens'])
+class Router extends RootStackRouter {
+  @override
+  List<AutoRoute> get routes => [
+    AutoRoute(page: Bootstrap.page, path: '/bootstrap', initial: true),
+    AutoRoute(page: ServerInfoSetupRoute.page, path: '/server-info'),
+    AutoRoute(page: ServerConnectionRoute.page, path: '/server-connection'),
+    AutoRoute(page: VaultSetupRoute.page, path: '/vault'),
+    AutoRoute(page: ClientDetailsRoute.page, path: '/clients/:clientId'),
+    AutoRoute(page: CreateEvmGrantRoute.page, path: '/evm-grants/create'),
+
+    AutoRoute(
+      page: DashboardRouter.page,
+      path: '/dashboard',
+      children: [
+        AutoRoute(page: EvmRoute.page, path: 'evm'),
+        AutoRoute(page: ClientsRoute.page, path: 'clients'),
+        AutoRoute(page: EvmGrantsRoute.page, path: 'grants'),
+        AutoRoute(page: AboutRoute.page, path: 'about'),
+      ],
+    ),
+  ];
+}
+```
+
+- [ ] **Step 2: Update `dashboard.dart`**
+
+In `useragent/lib/screens/dashboard.dart`, replace the `routes` constant:
+
+```dart
+final routes = [
+  const EvmRoute(),
+  const ClientsRoute(),
+  const EvmGrantsRoute(),
+  const AboutRoute(),
+];
+```
+
+And replace the `destinations` list inside `AdaptiveScaffold`:
+
+```dart
+destinations: const [
+  NavigationDestination(
+    icon: Icon(Icons.account_balance_wallet_outlined),
+    selectedIcon: Icon(Icons.account_balance_wallet),
+    label: 'Wallets',
+  ),
+  NavigationDestination(
+    icon: Icon(Icons.devices_other_outlined),
+    selectedIcon: Icon(Icons.devices_other),
+    label: 'Clients',
+  ),
+  NavigationDestination(
+    icon: Icon(Icons.policy_outlined),
+    selectedIcon: Icon(Icons.policy),
+    label: 'Grants',
+  ),
+  NavigationDestination(
+    icon: Icon(Icons.info_outline),
+    selectedIcon: Icon(Icons.info),
+    label: 'About',
+  ),
+],
+```
+
+- [ ] **Step 3: Regenerate router**
+
+```sh
+cd useragent && dart run build_runner build --delete-conflicting-outputs
+```
+
+Expected: `lib/router.gr.dart` updated, `EvmGrantsRoute` now available, no errors.
+
+- [ ] **Step 4: Full project verify**
+
+```sh
+cd useragent && flutter analyze
+```
+
+Expected: no issues.
+
+- [ ] **Step 5: Commit**
+
+```sh
+jj describe -m "feat(nav): add Grants dashboard tab"
+jj new
+```

docs/superpowers/specs/2026-03-28-grant-grid-view-design.md

@@ -0,0 +1,170 @@
+# Grant Grid View — Design Spec
+
+**Date:** 2026-03-28
+
+## Overview
+
+Add a "Grants" dashboard tab to the Flutter user-agent app that displays all EVM grants as a card-based grid. Each card shows a compact summary (type, chain, wallet address, client name) with a revoke action. The tab integrates into the existing `AdaptiveScaffold` navigation alongside Wallets, Clients, and About.
+
+## Scope
+
+- New `walletAccessListProvider` for fetching wallet access entries with their DB row IDs
+- New `EvmGrantsScreen` as a dashboard tab
+- Grant card widget with enriched display (type, chain, wallet, client)
+- Revoke action wired to existing `executeRevokeEvmGrant` mutation
+- Dashboard tab bar and router updated
+- New token-transfer accent color added to `Palette`
+
+**Out of scope:** Fixing grant creation (separate task).
+
+---
+
+## Data Layer
+
+### `walletAccessListProvider`
+
+**File:** `useragent/lib/providers/sdk_clients/wallet_access_list.dart`
+
+- `@riverpod` class, watches `connectionManagerProvider.future`
+- Returns `List<SdkClientWalletAccess>?` (null when not connected)
+- Each entry: `.id` (wallet_access_id), `.access.walletId`, `.access.sdkClientId`
+- Exposes a `refresh()` method following the same pattern as `EvmGrants.refresh()`
+
+### Enrichment at render time (Approach A)
+
+The `EvmGrantsScreen` watches four providers:
+1. `evmGrantsProvider` — the grant list
+2. `walletAccessListProvider` — to resolve wallet_access_id → (wallet_id, sdk_client_id)
+3. `evmProvider` — to resolve wallet_id → wallet address
+4. `sdkClientsProvider` — to resolve sdk_client_id → client name
+
+All lookups are in-memory Maps built inside the build method; no extra model class needed.
+
+Fallbacks:
+- Wallet address not found → `"Access #N"` where N is the wallet_access_id
+- Client name not found → `"Client #N"` where N is the sdk_client_id
+
+---
+
+## Route Structure
+
+```
+/dashboard
+  /evm          ← existing (Wallets tab)
+  /clients      ← existing (Clients tab)
+  /grants       ← NEW (Grants tab)
+  /about        ← existing
+
+/evm-grants/create  ← existing push route (unchanged)
+```
+
+### Changes to `router.dart`
+
+Add inside dashboard children:
+```dart
+AutoRoute(page: EvmGrantsRoute.page, path: 'grants'),
+```
+
+### Changes to `dashboard.dart`
+
+Add to `routes` list:
+```dart
+const EvmGrantsRoute()
+```
+
+Add `NavigationDestination`:
+```dart
+NavigationDestination(
+  icon: Icon(Icons.policy_outlined),
+  selectedIcon: Icon(Icons.policy),
+  label: 'Grants',
+),
+```
+
+---
+
+## Screen: `EvmGrantsScreen`
+
+**File:** `useragent/lib/screens/dashboard/evm/grants/grants.dart`
+
+```
+Scaffold
+└─ SafeArea
+   └─ RefreshIndicator.adaptive (refreshes evmGrantsProvider + walletAccessListProvider)
+      └─ ListView (BouncingScrollPhysics + AlwaysScrollableScrollPhysics)
+         ├─ PageHeader
+         │    title: 'EVM Grants'
+         │    isBusy: evmGrantsProvider.isLoading
+         │    actions: [CreateGrantButton, RefreshButton]
+         ├─ SizedBox(height: 1.8.h)
+         └─ <content>
+```
+
+### State handling
+
+Matches the pattern from `EvmScreen` and `ClientsScreen`:
+
+| State | Display |
+|---|---|
+| Loading (no data yet) | `_StatePanel` with spinner, "Loading grants" |
+| Error | `_StatePanel` with coral icon, error message, Retry button |
+| No connection | `_StatePanel`, "No active server connection" |
+| Empty list | `_StatePanel`, "No grants yet", with Create Grant shortcut |
+| Data | Column of `_GrantCard` widgets |
+
+### Header actions
+
+**CreateGrantButton:** `FilledButton.icon` with `Icons.add_rounded`, pushes `CreateEvmGrantRoute()` via `context.router.push(...)`.
+
+**RefreshButton:** `OutlinedButton.icon` with `Icons.refresh`, calls `ref.read(evmGrantsProvider.notifier).refresh()`.
+
+---
+
+## Grant Card: `_GrantCard`
+
+**Layout:**
+
+```
+Container (rounded 24, Palette.cream bg, Palette.line border)
+└─ IntrinsicHeight > Row
+   ├─ Accent strip (0.8.w wide, full height, rounded left)
+   └─ Padding > Column
+        ├─ Row 1: TypeBadge + ChainChip + Spacer + RevokeButton
+        └─ Row 2: WalletText + "·" + ClientText
+```
+
+**Accent color by grant type:**
+- Ether transfer → `Palette.coral`
+- Token transfer → `Palette.token` (new entry in `Palette` — indigo, e.g. `Color(0xFF5C6BC0)`)
+
+**TypeBadge:** Small pill container with accent color background at 15% opacity, accent-colored text. Label: `'Ether'` or `'Token'`.
+
+**ChainChip:** Small container: `'Chain ${grant.shared.chainId}'`, muted ink color.
+
+**WalletText:** Short hex address (`0xabc...def`) from wallet lookup, `bodySmall`, monospace font family.
+
+**ClientText:** Client name from `sdkClientsProvider` lookup, or fallback string. `bodySmall`, muted ink.
+
+**RevokeButton:**
+- `OutlinedButton` with `Icons.block_rounded` icon, label `'Revoke'`
+- `foregroundColor: Palette.coral`, `side: BorderSide(color: Palette.coral.withValues(alpha: 0.4))`
+- Disabled (replaced with `CircularProgressIndicator`) while `revokeEvmGrantMutation` is pending — note: this is a single global mutation, so all revoke buttons disable while any revoke is in flight
+- On press: calls `executeRevokeEvmGrant(ref, grantId: grant.id)`; shows `SnackBar` on error
+
+---
+
+## Adaptive Sizing
+
+All sizing uses `sizer` units (`1.h`, `1.w`, etc.). No hardcoded pixel values.
+
+---
+
+## Files to Create / Modify
+
+| File | Action |
+|---|---|
+| `lib/theme/palette.dart` | Modify — add `Palette.token` color |
+| `lib/providers/sdk_clients/wallet_access_list.dart` | Create |
+| `lib/screens/dashboard/evm/grants/grants.dart` | Create |
+| `lib/router.dart` | Modify — add grants route to dashboard children |
+| `lib/screens/dashboard.dart` | Modify — add tab to routes list and NavigationDestinations |

server/Cargo.lock

@@ -724,6 +724,7 @@ name = "arbiter-server"
 version = "0.1.0"
 dependencies = [
  "alloy",
+ "anyhow",
  "arbiter-proto",
  "arbiter-tokens-registry",
  "argon2",
@@ -737,12 +738,14 @@ dependencies = [
  "ed25519-dalek",
  "fatality",
  "futures",
+ "hmac",
  "insta",
  "k256",
  "kameo",
  "memsafe",
- "miette",
  "pem",
+ "postcard",
+ "prost",
  "prost-types",
  "rand 0.10.0",
  "rcgen",
@@ -750,6 +753,8 @@ dependencies = [
  "rsa",
  "rustls",
  "secrecy",
+ "serde",
+ "serde_with",
  "sha2 0.10.9",
  "smlang",
  "spki",
@@ -1052,6 +1057,15 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "atomic-polyfill"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8cf2bce30dfe09ef0bfaef228b9d414faaf7e563035494d7fe092dba54b300f4"
+dependencies = [
+ "critical-section",
+]
+
 [[package]]
 name = "atomic-waker"
 version = "1.1.2"
@@ -1442,6 +1456,15 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "cobs"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fa961b519f0b462e3a3b4a34b64d119eeaca1d59af726fe450bbba07a9fc0a1"
+dependencies = [
+ "thiserror 2.0.18",
+]
+
 [[package]]
 name = "console"
 version = "0.15.11"
@@ -1549,6 +1572,12 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "critical-section"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
+
 [[package]]
 name = "crossbeam-utils"
 version = "0.8.21"
@@ -1954,6 +1983,7 @@ version = "3.0.0-rc.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c6e914c7c52decb085cea910552e24c63ac019e3ab8bf001ff736da9a9d9d890"
 dependencies = [
+ "serde",
  "signature 3.0.0-rc.10",
 ]
 
@@ -1966,6 +1996,7 @@ dependencies = [
  "curve25519-dalek 5.0.0-pre.6",
  "ed25519",
  "rand_core 0.10.0",
+ "serde",
  "sha2 0.11.0-rc.5",
  "subtle",
  "zeroize",
@@ -2012,6 +2043,18 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "embedded-io"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef1a6892d9eef45c8fa6b9e0086428a2cca8491aca8f787c534a3d6d0bcb3ced"
+
+[[package]]
+name = "embedded-io"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edd0f118536f44f5ccd48bcb8b111bdc3de888b58c74639dfb034a357d0f206d"
+
 [[package]]
 name = "encode_unicode"
 version = "1.0.0"
@@ -2051,7 +2094,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.52.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -2429,6 +2472,15 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "hash32"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0c35f58762feb77d74ebe43bdbc3210f09be9fe6742234d573bacc26ed92b67"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.12.3"
@@ -2463,6 +2515,20 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "heapless"
+version = "0.7.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdc6457c0eb62c71aac4bc17216026d8410337c4126773b9c5daba343f17964f"
+dependencies = [
+ "atomic-polyfill",
+ "hash32",
+ "rustc_version 0.4.1",
+ "serde",
+ "spin",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -3186,7 +3252,7 @@ version = "0.50.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5"
 dependencies = [
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -3211,6 +3277,7 @@ dependencies = [
  "num-iter",
  "num-traits",
  "rand 0.8.5",
+ "serde",
  "smallvec",
  "zeroize",
 ]
@@ -3522,6 +3589,19 @@ version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c33a9471896f1c69cecef8d20cbe2f7accd12527ce60845ff44c153bb2a21b49"
 
+[[package]]
+name = "postcard"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6764c3b5dd454e283a30e6dfe78e9b31096d9e32036b5d1eaac7a6119ccb9a24"
+dependencies = [
+ "cobs",
+ "embedded-io 0.4.0",
+ "embedded-io 0.6.1",
+ "heapless",
+ "serde",
+]
+
 [[package]]
 name = "potential_utf"
 version = "0.1.4"
@@ -4150,6 +4230,7 @@ dependencies = [
  "pkcs1",
  "pkcs8",
  "rand_core 0.6.4",
+ "serde",
  "sha2 0.10.9",
  "signature 2.2.0",
  "spki",
@@ -4285,7 +4366,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.52.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -4701,7 +4782,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3a766e1110788c36f4fa1c2b71b387a7815aa65f88ce0229841826633d93723e"
 dependencies = [
  "libc",
- "windows-sys 0.60.2",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -4709,6 +4790,9 @@ name = "spin"
 version = "0.9.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+dependencies = [
+ "lock_api",
+]
 
 [[package]]
 name = "spki"
@@ -4895,7 +4979,7 @@ dependencies = [
  "getrandom 0.4.2",
  "once_cell",
  "rustix",
- "windows-sys 0.52.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]

server/Cargo.toml

@@ -22,7 +22,6 @@ chrono = { version = "0.4.44", features = ["serde"] }
 rand = "0.10.0"
 rustls = { version = "0.23.37", features = ["aws-lc-rs"] }
 smlang = "0.8.0"
-miette = { version = "7.6.0", features = ["fancy", "serde"] }
 thiserror = "2.0.18"
 async-trait = "0.1.89"
 futures = "0.3.32"
@@ -43,3 +42,5 @@ k256 = { version = "0.13.4", features = ["ecdsa", "pkcs8"] }
 rsa = { version = "0.9", features = ["sha2"] }
 sha2 = "0.10"
 spki = "0.7"
+prost = "0.14.3"
+miette = { version = "7.6.0", features = ["fancy", "serde"] }

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

@@ -122,9 +122,7 @@ async fn receive_auth_confirmation(
         .await
         .map_err(|_| AuthError::UnexpectedAuthResponse)?;
 
-    let payload = response
-        .payload
-        .ok_or(AuthError::UnexpectedAuthResponse)?;
+    let payload = response.payload.ok_or(AuthError::UnexpectedAuthResponse)?;
     match payload {
         ClientResponsePayload::Auth(response) => match response.payload {
             Some(AuthResponsePayload::Result(result))

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

@@ -1,4 +1,3 @@
-
 use std::io::{self, Write};
 
 use arbiter_client::ArbiterClient;
@@ -22,8 +21,6 @@ async fn main() {
         return;
     }
 
-   
-
     let url = match ArbiterUrl::try_from(input) {
         Ok(url) => url,
         Err(err) => {
@@ -32,7 +29,7 @@ async fn main() {
         }
     };
 
-     println!("{:#?}", url);
+    println!("{:#?}", url);
 
     let metadata = ClientMetadata {
         name: "arbiter-client test_connect".to_string(),
@@ -44,4 +41,4 @@ async fn main() {
         Ok(_) => println!("Connected and authenticated successfully."),
         Err(err) => eprintln!("Failed to connect: {:#?}", err),
     }
-}
+}

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

@@ -1,11 +1,16 @@
-use arbiter_proto::{ClientMetadata, proto::arbiter_service_client::ArbiterServiceClient, url::ArbiterUrl};
+use arbiter_proto::{
+    ClientMetadata, proto::arbiter_service_client::ArbiterServiceClient, url::ArbiterUrl,
+};
 use std::sync::Arc;
 use tokio::sync::{Mutex, mpsc};
 use tokio_stream::wrappers::ReceiverStream;
 use tonic::transport::ClientTlsConfig;
 
 use crate::{
-    StorageError, auth::{AuthError, authenticate}, storage::{FileSigningKeyStorage, SigningKeyStorage}, transport::{BUFFER_LENGTH, ClientTransport}
+    StorageError,
+    auth::{AuthError, authenticate},
+    storage::{FileSigningKeyStorage, SigningKeyStorage},
+    transport::{BUFFER_LENGTH, ClientTransport},
 };
 
 #[cfg(feature = "evm")]
@@ -30,7 +35,6 @@ pub enum Error {
 
     #[error("Storage error")]
     Storage(#[from] StorageError),
-    
 }
 
 pub struct ArbiterClient {
@@ -61,10 +65,11 @@ impl ArbiterClient {
         let anchor = webpki::anchor_from_trusted_cert(&url.ca_cert)?.to_owned();
         let tls = ClientTlsConfig::new().trust_anchor(anchor);
 
-        let channel = tonic::transport::Channel::from_shared(format!("https://{}:{}", url.host, url.port))?
-            .tls_config(tls)?
-            .connect()
-            .await?;
+        let channel =
+            tonic::transport::Channel::from_shared(format!("https://{}:{}", url.host, url.port))?
+                .tls_config(tls)?
+                .connect()
+                .await?;
 
         let mut client = ArbiterServiceClient::new(channel);
         let (tx, rx) = mpsc::channel(BUFFER_LENGTH);

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

@@ -9,4 +9,4 @@ pub use client::{ArbiterClient, Error};
 pub use storage::{FileSigningKeyStorage, SigningKeyStorage, StorageError};
 
 #[cfg(feature = "evm")]
-pub use wallets::evm::ArbiterEvmWallet;
+pub use wallets::evm::{ArbiterEvmSignTransactionError, ArbiterEvmWallet};

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

@@ -10,14 +10,48 @@ use tokio::sync::Mutex;
 
 use arbiter_proto::proto::{
     client::{
-        ClientRequest, client_request::Payload as ClientRequestPayload,
+        ClientRequest,
+        client_request::Payload as ClientRequestPayload,
         client_response::Payload as ClientResponsePayload,
+        evm::{
+            self as proto_evm, request::Payload as EvmRequestPayload,
+            response::Payload as EvmResponsePayload,
+        },
     },
-    evm::evm_sign_transaction_response::Result as EvmSignTransactionResult,
+    evm::{
+        EvmSignTransactionRequest,
+        evm_sign_transaction_response::Result as EvmSignTransactionResult,
+    },
+    shared::evm::TransactionEvalError,
 };
 
 use crate::transport::{ClientTransport, next_request_id};
 
+/// A typed error payload returned by [`ArbiterEvmWallet`] transaction signing.
+///
+/// This is wrapped into `alloy::signers::Error::Other`, so consumers can downcast by [`TryFrom`] and
+/// interpret the concrete policy evaluation failure instead of parsing strings.
+#[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
+pub enum ArbiterEvmSignTransactionError {
+    #[error("transaction rejected by policy: {0:?}")]
+    PolicyEval(TransactionEvalError),
+}
+
+impl<'a> TryFrom<&'a Error> for &'a ArbiterEvmSignTransactionError {
+    type Error = ();
+
+    fn try_from(value: &'a Error) -> Result<Self, Self::Error> {
+        if let Error::Other(inner) = value
+            && let Some(eval_error) = inner.downcast_ref()
+        {
+            Ok(eval_error)
+        } else {
+            Err(())
+        }
+    }
+}
+
 pub struct ArbiterEvmWallet {
     transport: Arc<Mutex<ClientTransport>>,
     address: Address,
@@ -96,12 +130,14 @@ impl TxSigner<Signature> for ArbiterEvmWallet {
         transport
             .send(ClientRequest {
                 request_id,
-                payload: Some(ClientRequestPayload::EvmSignTransaction(
-                    arbiter_proto::proto::evm::EvmSignTransactionRequest {
-                        wallet_address: self.address.to_vec(),
-                        rlp_transaction,
-                    },
-                )),
+                payload: Some(ClientRequestPayload::Evm(proto_evm::Request {
+                    payload: Some(EvmRequestPayload::SignTransaction(
+                        EvmSignTransactionRequest {
+                            wallet_address: self.address.to_vec(),
+                            rlp_transaction,
+                        },
+                    )),
+                })),
             })
             .await
             .map_err(|_| Error::other("failed to send evm sign transaction request"))?;
@@ -121,12 +157,21 @@ impl TxSigner<Signature> for ArbiterEvmWallet {
             .payload
             .ok_or_else(|| Error::other("missing evm sign transaction response payload"))?;
 
-        let ClientResponsePayload::EvmSignTransaction(response) = payload else {
+        let ClientResponsePayload::Evm(proto_evm::Response {
+            payload: Some(payload),
+        }) = payload
+        else {
             return Err(Error::other(
                 "unexpected response payload for evm sign transaction request",
             ));
         };
 
+        let EvmResponsePayload::SignTransaction(response) = payload else {
+            return Err(Error::other(
+                "unexpected evm response payload for sign transaction request",
+            ));
+        };
+
         let result = response
             .result
             .ok_or_else(|| Error::other("missing evm sign transaction result"))?;
@@ -136,9 +181,9 @@ impl TxSigner<Signature> for ArbiterEvmWallet {
                 Signature::try_from(signature.as_slice())
                     .map_err(|_| Error::other("invalid signature returned by server"))
             }
-            EvmSignTransactionResult::EvalError(eval_error) => Err(Error::other(format!(
-                "transaction rejected by policy: {eval_error:?}"
-            ))),
+            EvmSignTransactionResult::EvalError(eval_error) => Err(Error::other(
+                ArbiterEvmSignTransactionError::PolicyEval(eval_error),
+            )),
             EvmSignTransactionResult::Error(code) => Err(Error::other(format!(
                 "server failed to sign transaction with error code {code}"
             ))),

server/crates/arbiter-proto/Cargo.toml

@@ -11,7 +11,7 @@ tokio.workspace = true
 futures.workspace = true
 hex = "0.4.3"
 tonic-prost = "0.14.5"
-prost = "0.14.3"
+prost.workspace = true
 kameo.workspace = true
 url = "2.5.8"
 miette.workspace = true

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

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

server/crates/arbiter-server/Cargo.toml

@@ -17,6 +17,7 @@ diesel-async = { version = "0.8.0", features = [
     "tokio",
 ] }
 ed25519-dalek.workspace = true
+ed25519-dalek.features = ["serde"]
 arbiter-proto.path = "../arbiter-proto"
 tracing.workspace = true
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
@@ -25,7 +26,6 @@ tonic.features = ["tls-aws-lc"]
 tokio.workspace = true
 rustls.workspace = true
 smlang.workspace = true
-miette.workspace = true
 thiserror.workspace = true
 fatality = "0.1.1"
 diesel_migrations = { version = "2.3.1", features = ["sqlite"] }
@@ -47,12 +47,20 @@ restructed = "0.2.2"
 strum = { version = "0.28.0", features = ["derive"] }
 pem = "3.0.6"
 k256.workspace = true
+k256.features = ["serde"]
 rsa.workspace = true
+rsa.features = ["serde"]
 sha2.workspace = true
+hmac = "0.12"
 spki.workspace = true
 alloy.workspace = true
 prost-types.workspace = true
+prost.workspace = true
 arbiter-tokens-registry.path = "../arbiter-tokens-registry"
+anyhow = "1.0.102"
+postcard = { version = "1.1.3", features = ["use-std"] }
+serde = { version = "1.0.228", features = ["derive"] }
+serde_with = "3.18.0"
 
 [dev-dependencies]
 insta = "1.46.3"

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

@@ -191,3 +191,19 @@ create table if not exists evm_ether_transfer_grant_target (
 ) STRICT;
 
 create unique index if not exists uniq_ether_transfer_target on evm_ether_transfer_grant_target (grant_id, address);
+
+-- ===============================
+-- Integrity Envelopes
+-- ===============================
+create table if not exists integrity_envelope (
+    id integer not null primary key,
+    entity_kind text not null,
+    entity_id blob not null,
+    payload_version integer not null,
+    key_version integer not null,
+    mac blob not null, -- 20-byte recipient address
+    signed_at integer not null default(unixepoch ('now')),
+    created_at integer not null default(unixepoch ('now'))
+) STRICT;
+
+create unique index if not exists uniq_integrity_envelope_entity on integrity_envelope (entity_kind, entity_id);

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

@@ -2,7 +2,7 @@ use arbiter_proto::{BOOTSTRAP_PATH, home_path};
 use diesel::QueryDsl;
 use diesel_async::RunQueryDsl;
 use kameo::{Actor, messages};
-use miette::Diagnostic;
+
 use rand::{RngExt, distr::Alphanumeric, make_rng, rngs::StdRng};
 use thiserror::Error;
 
@@ -25,18 +25,15 @@ pub async fn generate_token() -> Result<String, std::io::Error> {
     Ok(token)
 }
 
-#[derive(Error, Debug, Diagnostic)]
+#[derive(Error, Debug)]
 pub enum Error {
     #[error("Database error: {0}")]
-    #[diagnostic(code(arbiter_server::bootstrap::database))]
     Database(#[from] db::PoolError),
 
     #[error("Database query error: {0}")]
-    #[diagnostic(code(arbiter_server::bootstrap::database_query))]
     Query(#[from] diesel::result::Error),
 
     #[error("I/O error: {0}")]
-    #[diagnostic(code(arbiter_server::bootstrap::io))]
     Io(#[from] std::io::Error),
 }
 

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

@@ -287,10 +287,7 @@ where
     Ok(())
 }
 
-pub async fn authenticate<T>(
-    props: &mut ClientConnection,
-    transport: &mut T,
-) -> Result<i32, Error>
+pub async fn authenticate<T>(props: &mut ClientConnection, transport: &mut T) -> Result<i32, Error>
 where
     T: Bi<Inbound, Result<Outbound, Error>> + Send + ?Sized,
 {
@@ -319,7 +316,7 @@ where
 
     sync_client_metadata(&props.db, info.id, &metadata).await?;
     challenge_client(transport, pubkey, info.current_nonce).await?;
-    
+
     transport
         .send(Ok(Outbound::AuthSuccess))
         .await

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

@@ -20,10 +20,7 @@ pub struct ClientConnection {
 
 impl ClientConnection {
     pub fn new(db: db::DatabasePool, actors: GlobalActors) -> Self {
-        Self {
-            db,
-            actors,
-        }
+        Self { db, actors }
     }
 }
 

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

@@ -6,11 +6,10 @@ use alloy::{consensus::TxEip1559, primitives::Address, signers::Signature};
 use crate::{
     actors::{
         GlobalActors,
-        client::ClientConnection, flow_coordinator::RegisterClient,
-       
+        client::ClientConnection,
         evm::{ClientSignTransaction, SignTransactionError},
+        flow_coordinator::RegisterClient,
         keyholder::KeyHolderState,
-       
     },
     db,
     evm::VetError,
@@ -95,7 +94,10 @@ impl Actor for ClientSession {
 impl ClientSession {
     pub fn new_test(db: db::DatabasePool, actors: GlobalActors) -> Self {
         let props = ClientConnection::new(db, actors);
-        Self { props, client_id: 0 }
+        Self {
+            props,
+            client_id: 0,
+        }
     }
 }
 

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

@@ -1,22 +1,24 @@
 use alloy::{consensus::TxEip1559, primitives::Address, signers::Signature};
 use diesel::{
-    ExpressionMethods, OptionalExtension as _, QueryDsl, SelectableHelper as _, dsl::insert_into,
+    BoolExpressionMethods as _, ExpressionMethods, OptionalExtension as _, QueryDsl,
+    SelectableHelper as _, dsl::insert_into,
 };
-use diesel_async::RunQueryDsl;
+use diesel_async::{AsyncConnection as _, RunQueryDsl};
 use kameo::{Actor, actor::ActorRef, messages};
 use rand::{SeedableRng, rng, rngs::StdRng};
 
 use crate::{
     actors::keyholder::{CreateNew, Decrypt, KeyHolder},
+    crypto::integrity,
     db::{
         DatabaseError, DatabasePool,
-        models::{self, SqliteTimestamp},
+        models::{self},
         schema,
     },
     evm::{
-        self, RunKind,
+        self, ListError, RunKind,
         policies::{
-            FullGrant, Grant, SharedGrantSettings, SpecificGrant, SpecificMeaning,
+            CombinedSettings, Grant, SharedGrantSettings, SpecificGrant, SpecificMeaning,
             ether_transfer::EtherTransfer, token_transfers::TokenTransfer,
         },
     },
@@ -25,46 +27,40 @@ use crate::{
 
 pub use crate::evm::safe_signer;
 
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
+#[derive(Debug, thiserror::Error)]
 pub enum SignTransactionError {
     #[error("Wallet not found")]
-    #[diagnostic(code(arbiter::evm::sign::wallet_not_found))]
     WalletNotFound,
 
     #[error("Database error: {0}")]
-    #[diagnostic(code(arbiter::evm::sign::database))]
     Database(#[from] DatabaseError),
 
     #[error("Keyholder error: {0}")]
-    #[diagnostic(code(arbiter::evm::sign::keyholder))]
     Keyholder(#[from] crate::actors::keyholder::Error),
 
     #[error("Keyholder mailbox error")]
-    #[diagnostic(code(arbiter::evm::sign::keyholder_send))]
     KeyholderSend,
 
     #[error("Signing error: {0}")]
-    #[diagnostic(code(arbiter::evm::sign::signing))]
     Signing(#[from] alloy::signers::Error),
 
     #[error("Policy error: {0}")]
-    #[diagnostic(code(arbiter::evm::sign::vet))]
     Vet(#[from] evm::VetError),
 }
 
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
+#[derive(Debug, thiserror::Error)]
 pub enum Error {
     #[error("Keyholder error: {0}")]
-    #[diagnostic(code(arbiter::evm::keyholder))]
     Keyholder(#[from] crate::actors::keyholder::Error),
 
     #[error("Keyholder mailbox error")]
-    #[diagnostic(code(arbiter::evm::keyholder_send))]
     KeyholderSend,
 
     #[error("Database error: {0}")]
-    #[diagnostic(code(arbiter::evm::database))]
     Database(#[from] DatabaseError),
+
+    #[error("Integrity violation: {0}")]
+    Integrity(#[from] integrity::Error),
 }
 
 #[derive(Actor)]
@@ -80,7 +76,7 @@ impl EvmActor {
         // is it safe to seed rng from system once?
         // todo: audit
         let rng = StdRng::from_rng(&mut rng());
-        let engine = evm::Engine::new(db.clone());
+        let engine = evm::Engine::new(db.clone(), keyholder.clone());
         Self {
             keyholder,
             db,
@@ -141,46 +137,146 @@ impl EvmActor {
         &mut self,
         basic: SharedGrantSettings,
         grant: SpecificGrant,
-    ) -> Result<i32, DatabaseError> {
+    ) -> Result<i32, Error> {
         match grant {
-            SpecificGrant::EtherTransfer(settings) => {
-                self.engine
-                    .create_grant::<EtherTransfer>(FullGrant {
-                        basic,
-                        specific: settings,
-                    })
-                    .await
-            }
-            SpecificGrant::TokenTransfer(settings) => {
-                self.engine
-                    .create_grant::<TokenTransfer>(FullGrant {
-                        basic,
-                        specific: settings,
-                    })
-                    .await
-            }
+            SpecificGrant::EtherTransfer(settings) => self
+                .engine
+                .create_grant::<EtherTransfer>(CombinedSettings {
+                    shared: basic,
+                    specific: settings,
+                })
+                .await
+                .map_err(Error::from),
+            SpecificGrant::TokenTransfer(settings) => self
+                .engine
+                .create_grant::<TokenTransfer>(CombinedSettings {
+                    shared: basic,
+                    specific: settings,
+                })
+                .await
+                .map_err(Error::from),
         }
     }
 
     #[message]
     pub async fn useragent_delete_grant(&mut self, grant_id: i32) -> Result<(), Error> {
         let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
-        diesel::update(schema::evm_basic_grant::table)
-            .filter(schema::evm_basic_grant::id.eq(grant_id))
-            .set(schema::evm_basic_grant::revoked_at.eq(SqliteTimestamp::now()))
-            .execute(&mut conn)
-            .await
-            .map_err(DatabaseError::from)?;
+
+        // We intentionally perform a hard delete here to avoid leaving revoked grants and their
+        // related rows as long-lived DB garbage. We also don't rely on SQLite FK cascades because
+        // they can be disabled per-connection.
+        conn.transaction(|conn| {
+            Box::pin(async move {
+                // First, resolve policy-specific rows by basic grant id.
+                let token_grant_id: Option<i32> = schema::evm_token_transfer_grant::table
+                    .select(schema::evm_token_transfer_grant::id)
+                    .filter(schema::evm_token_transfer_grant::basic_grant_id.eq(grant_id))
+                    .first::<i32>(conn)
+                    .await
+                    .optional()?;
+
+                let ether_grant: Option<(i32, i32)> = schema::evm_ether_transfer_grant::table
+                    .select((
+                        schema::evm_ether_transfer_grant::id,
+                        schema::evm_ether_transfer_grant::limit_id,
+                    ))
+                    .filter(schema::evm_ether_transfer_grant::basic_grant_id.eq(grant_id))
+                    .first::<(i32, i32)>(conn)
+                    .await
+                    .optional()?;
+
+                // Token-transfer: logs must be deleted before transaction logs (FK restrict).
+                if let Some(token_grant_id) = token_grant_id {
+                    diesel::delete(
+                        schema::evm_token_transfer_log::table
+                            .filter(schema::evm_token_transfer_log::grant_id.eq(token_grant_id)),
+                    )
+                    .execute(conn)
+                    .await?;
+
+                    diesel::delete(schema::evm_token_transfer_volume_limit::table.filter(
+                        schema::evm_token_transfer_volume_limit::grant_id.eq(token_grant_id),
+                    ))
+                    .execute(conn)
+                    .await?;
+
+                    diesel::delete(
+                        schema::evm_token_transfer_grant::table
+                            .filter(schema::evm_token_transfer_grant::id.eq(token_grant_id)),
+                    )
+                    .execute(conn)
+                    .await?;
+                }
+
+                // Shared transaction logs for any grant kind.
+                diesel::delete(
+                    schema::evm_transaction_log::table
+                        .filter(schema::evm_transaction_log::grant_id.eq(grant_id)),
+                )
+                .execute(conn)
+                .await?;
+
+                // Ether-transfer: delete targets, grant row, then its limit row.
+                if let Some((ether_grant_id, limit_id)) = ether_grant {
+                    diesel::delete(schema::evm_ether_transfer_grant_target::table.filter(
+                        schema::evm_ether_transfer_grant_target::grant_id.eq(ether_grant_id),
+                    ))
+                    .execute(conn)
+                    .await?;
+
+                    diesel::delete(
+                        schema::evm_ether_transfer_grant::table
+                            .filter(schema::evm_ether_transfer_grant::id.eq(ether_grant_id)),
+                    )
+                    .execute(conn)
+                    .await?;
+
+                    diesel::delete(
+                        schema::evm_ether_transfer_limit::table
+                            .filter(schema::evm_ether_transfer_limit::id.eq(limit_id)),
+                    )
+                    .execute(conn)
+                    .await?;
+                }
+
+                // Integrity envelopes are not FK-constrained; delete only grant-related kinds to
+                // avoid accidentally deleting other entities that share the same integer ID.
+                let entity_id = grant_id.to_be_bytes().to_vec();
+                diesel::delete(
+                    schema::integrity_envelope::table
+                        .filter(schema::integrity_envelope::entity_id.eq(entity_id))
+                        .filter(
+                            schema::integrity_envelope::entity_kind
+                                .eq("EtherTransfer")
+                                .or(schema::integrity_envelope::entity_kind.eq("TokenTransfer")),
+                        ),
+                )
+                .execute(conn)
+                .await?;
+
+                // Finally remove the basic grant row itself (idempotent if it doesn't exist).
+                diesel::delete(
+                    schema::evm_basic_grant::table.filter(schema::evm_basic_grant::id.eq(grant_id)),
+                )
+                .execute(conn)
+                .await?;
+
+                diesel::result::QueryResult::Ok(())
+            })
+        })
+        .await
+        .map_err(DatabaseError::from)?;
+
         Ok(())
     }
 
     #[message]
     pub async fn useragent_list_grants(&mut self) -> Result<Vec<Grant<SpecificGrant>>, Error> {
-        Ok(self
-            .engine
-            .list_all_grants()
-            .await
-            .map_err(DatabaseError::from)?)
+        match self.engine.list_all_grants().await {
+            Ok(grants) => Ok(grants),
+            Err(ListError::Database(db_err)) => Err(Error::Database(db_err)),
+            Err(ListError::Integrity(integrity_err)) => Err(Error::Integrity(integrity_err)),
+        }
     }
 
     #[message]
@@ -263,3 +359,6 @@ impl EvmActor {
         Ok(signer.sign_transaction_sync(&mut transaction)?)
     }
 }
+
+#[cfg(test)]
+mod tests;

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

@@ -0,0 +1,283 @@
+use diesel::{ExpressionMethods as _, QueryDsl as _, dsl::insert_into};
+use diesel_async::RunQueryDsl;
+use kameo::actor::Spawn as _;
+
+use crate::{
+    actors::{evm::EvmActor, keyholder::KeyHolder},
+    db::{self, models, schema},
+};
+
+#[tokio::test]
+async fn delete_ether_grant_cleans_related_tables() {
+    let db = db::create_test_pool().await;
+    let keyholder = KeyHolder::spawn(KeyHolder::new(db.clone()).await.unwrap());
+    let mut actor = EvmActor::new(keyholder, db.clone());
+
+    let mut conn = db.get().await.unwrap();
+
+    let basic_id: i32 = insert_into(schema::evm_basic_grant::table)
+        .values(&models::NewEvmBasicGrant {
+            wallet_access_id: 1,
+            chain_id: 1,
+            valid_from: None,
+            valid_until: None,
+            max_gas_fee_per_gas: None,
+            max_priority_fee_per_gas: None,
+            rate_limit_count: None,
+            rate_limit_window_secs: None,
+            revoked_at: None,
+        })
+        .returning(schema::evm_basic_grant::id)
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+
+    let limit_id: i32 = insert_into(schema::evm_ether_transfer_limit::table)
+        .values(&models::NewEvmEtherTransferLimit {
+            window_secs: 60,
+            max_volume: vec![1],
+        })
+        .returning(schema::evm_ether_transfer_limit::id)
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+
+    let ether_grant_id: i32 = insert_into(schema::evm_ether_transfer_grant::table)
+        .values(&models::NewEvmEtherTransferGrant {
+            basic_grant_id: basic_id,
+            limit_id,
+        })
+        .returning(schema::evm_ether_transfer_grant::id)
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+
+    insert_into(schema::evm_ether_transfer_grant_target::table)
+        .values(&models::NewEvmEtherTransferGrantTarget {
+            grant_id: ether_grant_id,
+            address: vec![0u8; 20],
+        })
+        .execute(&mut conn)
+        .await
+        .unwrap();
+
+    insert_into(schema::evm_transaction_log::table)
+        .values(&models::NewEvmTransactionLog {
+            grant_id: basic_id,
+            wallet_access_id: 1,
+            chain_id: 1,
+            eth_value: vec![0],
+            signed_at: models::SqliteTimestamp::now(),
+        })
+        .execute(&mut conn)
+        .await
+        .unwrap();
+
+    insert_into(schema::integrity_envelope::table)
+        .values(&models::NewIntegrityEnvelope {
+            entity_kind: "EtherTransfer".to_owned(),
+            entity_id: basic_id.to_be_bytes().to_vec(),
+            payload_version: 1,
+            key_version: 1,
+            mac: vec![0u8; 32],
+        })
+        .execute(&mut conn)
+        .await
+        .unwrap();
+
+    drop(conn);
+
+    actor.useragent_delete_grant(basic_id).await.unwrap();
+
+    // Idempotency: second delete should be a no-op.
+    actor.useragent_delete_grant(basic_id).await.unwrap();
+
+    let mut conn = db.get().await.unwrap();
+
+    let basic_count: i64 = schema::evm_basic_grant::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(basic_count, 0);
+
+    let ether_grant_count: i64 = schema::evm_ether_transfer_grant::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(ether_grant_count, 0);
+
+    let target_count: i64 = schema::evm_ether_transfer_grant_target::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(target_count, 0);
+
+    let limit_count: i64 = schema::evm_ether_transfer_limit::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(limit_count, 0);
+
+    let log_count: i64 = schema::evm_transaction_log::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(log_count, 0);
+
+    let envelope_count: i64 = schema::integrity_envelope::table
+        .filter(schema::integrity_envelope::entity_kind.eq("EtherTransfer"))
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(envelope_count, 0);
+}
+
+#[tokio::test]
+async fn delete_token_grant_cleans_related_tables() {
+    let db = db::create_test_pool().await;
+    let keyholder = KeyHolder::spawn(KeyHolder::new(db.clone()).await.unwrap());
+    let mut actor = EvmActor::new(keyholder, db.clone());
+
+    let mut conn = db.get().await.unwrap();
+
+    let basic_id: i32 = insert_into(schema::evm_basic_grant::table)
+        .values(&models::NewEvmBasicGrant {
+            wallet_access_id: 1,
+            chain_id: 1,
+            valid_from: None,
+            valid_until: None,
+            max_gas_fee_per_gas: None,
+            max_priority_fee_per_gas: None,
+            rate_limit_count: None,
+            rate_limit_window_secs: None,
+            revoked_at: None,
+        })
+        .returning(schema::evm_basic_grant::id)
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+
+    let token_grant_id: i32 = insert_into(schema::evm_token_transfer_grant::table)
+        .values(&models::NewEvmTokenTransferGrant {
+            basic_grant_id: basic_id,
+            token_contract: vec![1u8; 20],
+            receiver: None,
+        })
+        .returning(schema::evm_token_transfer_grant::id)
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+
+    insert_into(schema::evm_token_transfer_volume_limit::table)
+        .values(&models::NewEvmTokenTransferVolumeLimit {
+            grant_id: token_grant_id,
+            window_secs: 60,
+            max_volume: vec![1],
+        })
+        .execute(&mut conn)
+        .await
+        .unwrap();
+
+    insert_into(schema::evm_token_transfer_volume_limit::table)
+        .values(&models::NewEvmTokenTransferVolumeLimit {
+            grant_id: token_grant_id,
+            window_secs: 3600,
+            max_volume: vec![2],
+        })
+        .execute(&mut conn)
+        .await
+        .unwrap();
+
+    let tx_log_id: i32 = insert_into(schema::evm_transaction_log::table)
+        .values(&models::NewEvmTransactionLog {
+            grant_id: basic_id,
+            wallet_access_id: 1,
+            chain_id: 1,
+            eth_value: vec![0],
+            signed_at: models::SqliteTimestamp::now(),
+        })
+        .returning(schema::evm_transaction_log::id)
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+
+    insert_into(schema::evm_token_transfer_log::table)
+        .values(&models::NewEvmTokenTransferLog {
+            grant_id: token_grant_id,
+            log_id: tx_log_id,
+            chain_id: 1,
+            token_contract: vec![1u8; 20],
+            recipient_address: vec![2u8; 20],
+            value: vec![3],
+        })
+        .execute(&mut conn)
+        .await
+        .unwrap();
+
+    insert_into(schema::integrity_envelope::table)
+        .values(&models::NewIntegrityEnvelope {
+            entity_kind: "TokenTransfer".to_owned(),
+            entity_id: basic_id.to_be_bytes().to_vec(),
+            payload_version: 1,
+            key_version: 1,
+            mac: vec![0u8; 32],
+        })
+        .execute(&mut conn)
+        .await
+        .unwrap();
+
+    drop(conn);
+
+    actor.useragent_delete_grant(basic_id).await.unwrap();
+
+    let mut conn = db.get().await.unwrap();
+
+    let basic_count: i64 = schema::evm_basic_grant::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(basic_count, 0);
+
+    let token_grant_count: i64 = schema::evm_token_transfer_grant::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(token_grant_count, 0);
+
+    let token_limits_count: i64 = schema::evm_token_transfer_volume_limit::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(token_limits_count, 0);
+
+    let token_logs_count: i64 = schema::evm_token_transfer_log::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(token_logs_count, 0);
+
+    let tx_logs_count: i64 = schema::evm_transaction_log::table
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(tx_logs_count, 0);
+
+    let envelope_count: i64 = schema::integrity_envelope::table
+        .filter(schema::integrity_envelope::entity_kind.eq("TokenTransfer"))
+        .count()
+        .get_result(&mut conn)
+        .await
+        .unwrap();
+    assert_eq!(envelope_count, 0);
+}

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

@@ -15,7 +15,7 @@ use crate::actors::{
 pub struct Args {
     pub client: ClientProfile,
     pub user_agents: Vec<ActorRef<UserAgentSession>>,
-    pub reply: ReplySender<Result<bool, ApprovalError>>
+    pub reply: ReplySender<Result<bool, ApprovalError>>,
 }
 
 pub struct ClientApprovalController {
@@ -39,7 +39,11 @@ impl Actor for ClientApprovalController {
     type Error = ();
 
     async fn on_start(
-        Args { client, mut user_agents, reply }: Self::Args,
+        Args {
+            client,
+            mut user_agents,
+            reply,
+        }: Self::Args,
         actor_ref: ActorRef<Self>,
     ) -> Result<Self, Self::Error> {
         let this = Self {

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

@@ -1 +0,0 @@
-pub mod v1;

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

@@ -4,11 +4,19 @@ use diesel::{
     dsl::{insert_into, update},
 };
 use diesel_async::{AsyncConnection, RunQueryDsl};
+use hmac::Mac as _;
 use kameo::{Actor, Reply, messages};
 use strum::{EnumDiscriminants, IntoDiscriminant};
 use tracing::{error, info};
 
-use crate::safe_cell::SafeCell;
+use crate::{
+    crypto::{
+        KeyCell, derive_key,
+        encryption::v1::{self, Nonce},
+        integrity::v1::HmacSha256,
+    },
+    safe_cell::SafeCell,
+};
 use crate::{
     db::{
         self,
@@ -17,9 +25,6 @@ use crate::{
     },
     safe_cell::SafeCellHandle as _,
 };
-use encryption::v1::{self, KeyCell, Nonce};
-
-pub mod encryption;
 
 #[derive(Default, EnumDiscriminants)]
 #[strum_discriminants(derive(Reply), vis(pub), name(KeyHolderState))]
@@ -35,36 +40,28 @@ enum State {
     },
 }
 
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
+#[derive(Debug, thiserror::Error)]
 pub enum Error {
     #[error("Keyholder is already bootstrapped")]
-    #[diagnostic(code(arbiter::keyholder::already_bootstrapped))]
     AlreadyBootstrapped,
     #[error("Keyholder is not bootstrapped")]
-    #[diagnostic(code(arbiter::keyholder::not_bootstrapped))]
     NotBootstrapped,
     #[error("Invalid key provided")]
-    #[diagnostic(code(arbiter::keyholder::invalid_key))]
     InvalidKey,
 
     #[error("Requested aead entry not found")]
-    #[diagnostic(code(arbiter::keyholder::aead_not_found))]
     NotFound,
 
     #[error("Encryption error: {0}")]
-    #[diagnostic(code(arbiter::keyholder::encryption_error))]
     Encryption(#[from] chacha20poly1305::aead::Error),
 
     #[error("Database error: {0}")]
-    #[diagnostic(code(arbiter::keyholder::database_error))]
     DatabaseConnection(#[from] db::PoolError),
 
     #[error("Database transaction error: {0}")]
-    #[diagnostic(code(arbiter::keyholder::database_transaction_error))]
     DatabaseTransaction(#[from] diesel::result::Error),
 
     #[error("Broken database")]
-    #[diagnostic(code(arbiter::keyholder::broken_database))]
     BrokenDatabase,
 }
 
@@ -114,14 +111,13 @@ impl KeyHolder {
                         .first(conn)
                         .await?;
 
-                    let mut nonce =
-                        v1::Nonce::try_from(current_nonce.as_slice()).map_err(|_| {
-                            error!(
-                                "Broken database: invalid nonce for root key history id={}",
-                                root_key_id
-                            );
-                            Error::BrokenDatabase
-                        })?;
+                    let mut nonce = Nonce::try_from(current_nonce.as_slice()).map_err(|_| {
+                        error!(
+                            "Broken database: invalid nonce for root key history id={}",
+                            root_key_id
+                        );
+                        Error::BrokenDatabase
+                    })?;
                     nonce.increment();
 
                     update(schema::root_key_history::table)
@@ -144,12 +140,12 @@ impl KeyHolder {
             return Err(Error::AlreadyBootstrapped);
         }
         let salt = v1::generate_salt();
-        let mut seal_key = v1::derive_seal_key(seal_key_raw, &salt);
+        let mut seal_key = derive_key(seal_key_raw, &salt);
         let mut root_key = KeyCell::new_secure_random();
 
         // Zero nonces are fine because they are one-time
-        let root_key_nonce = v1::Nonce::default();
-        let data_encryption_nonce = v1::Nonce::default();
+        let root_key_nonce = Nonce::default();
+        let data_encryption_nonce = Nonce::default();
 
         let root_key_ciphertext: Vec<u8> = root_key.0.read_inline(|reader| {
             let root_key_reader = reader.as_slice();
@@ -224,7 +220,7 @@ impl KeyHolder {
             error!("Broken database: invalid salt for root key");
             Error::BrokenDatabase
         })?;
-        let mut seal_key = v1::derive_seal_key(seal_key_raw, &salt);
+        let mut seal_key = derive_key(seal_key_raw, &salt);
 
         let mut root_key = SafeCell::new(current_key.ciphertext.clone());
 
@@ -244,7 +240,7 @@ impl KeyHolder {
 
         self.state = State::Unsealed {
             root_key_history_id: current_key.id,
-            root_key: v1::KeyCell::try_from(root_key).map_err(|err| {
+            root_key: KeyCell::try_from(root_key).map_err(|err| {
                 error!(?err, "Broken database: invalid encryption key size");
                 Error::BrokenDatabase
             })?,
@@ -255,7 +251,6 @@ impl KeyHolder {
         Ok(())
     }
 
-    // Decrypts the `aead_encrypted` entry with the given ID and returns the plaintext
     #[message]
     pub async fn decrypt(&mut self, aead_id: i32) -> Result<SafeCell<Vec<u8>>, Error> {
         let State::Unsealed { root_key, .. } = &mut self.state else {
@@ -291,6 +286,7 @@ impl KeyHolder {
         let State::Unsealed {
             root_key,
             root_key_history_id,
+            ..
         } = &mut self.state
         else {
             return Err(Error::NotBootstrapped);
@@ -328,6 +324,60 @@ impl KeyHolder {
         self.state.discriminant()
     }
 
+    #[message]
+    pub fn sign_integrity(&mut self, mac_input: Vec<u8>) -> Result<(i32, Vec<u8>), Error> {
+        let State::Unsealed {
+            root_key,
+            root_key_history_id,
+        } = &mut self.state
+        else {
+            return Err(Error::NotBootstrapped);
+        };
+
+        let mut hmac = root_key
+            .0
+            .read_inline(|k| match HmacSha256::new_from_slice(k) {
+                Ok(v) => v,
+                Err(_) => unreachable!("HMAC accepts keys of any size"),
+            });
+        hmac.update(&root_key_history_id.to_be_bytes());
+        hmac.update(&mac_input);
+
+        let mac = hmac.finalize().into_bytes().to_vec();
+        Ok((*root_key_history_id, mac))
+    }
+
+    #[message]
+    pub fn verify_integrity(
+        &mut self,
+        mac_input: Vec<u8>,
+        expected_mac: Vec<u8>,
+        key_version: i32,
+    ) -> Result<bool, Error> {
+        let State::Unsealed {
+            root_key,
+            root_key_history_id,
+        } = &mut self.state
+        else {
+            return Err(Error::NotBootstrapped);
+        };
+
+        if *root_key_history_id != key_version {
+            return Ok(false);
+        }
+
+        let mut hmac = root_key
+            .0
+            .read_inline(|k| match HmacSha256::new_from_slice(k) {
+                Ok(v) => v,
+                Err(_) => unreachable!("HMAC accepts keys of any size"),
+            });
+        hmac.update(&key_version.to_be_bytes());
+        hmac.update(&mac_input);
+
+        Ok(hmac.verify_slice(&expected_mac).is_ok())
+    }
+
     #[message]
     pub fn seal(&mut self) -> Result<(), Error> {
         let State::Unsealed {

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

@@ -1,5 +1,4 @@
 use kameo::actor::{ActorRef, Spawn};
-use miette::Diagnostic;
 use thiserror::Error;
 
 use crate::{
@@ -17,14 +16,12 @@ pub mod flow_coordinator;
 pub mod keyholder;
 pub mod user_agent;
 
-#[derive(Error, Debug, Diagnostic)]
+#[derive(Error, Debug)]
 pub enum SpawnError {
     #[error("Failed to spawn Bootstrapper actor")]
-    #[diagnostic(code(SpawnError::Bootstrapper))]
     Bootstrapper(#[from] bootstrap::Error),
 
     #[error("Failed to spawn KeyHolder actor")]
-    #[diagnostic(code(SpawnError::KeyHolder))]
     KeyHolder(#[from] keyholder::Error),
 }
 

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

@@ -37,6 +37,13 @@ impl Error {
     }
 }
 
+impl From<diesel::result::Error> for Error {
+    fn from(e: diesel::result::Error) -> Self {
+        error!(?e, "Database error");
+        Self::internal("Database error")
+    }
+}
+
 #[derive(Debug, Clone)]
 pub enum Outbound {
     AuthChallenge { nonce: i32 },

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

@@ -1,15 +1,18 @@
 use arbiter_proto::transport::Bi;
 use diesel::{ExpressionMethods as _, OptionalExtension as _, QueryDsl, update};
-use diesel_async::RunQueryDsl;
+use diesel_async::{AsyncConnection, RunQueryDsl};
+use kameo::{actor::ActorRef, error::SendError};
 use tracing::error;
 
 use super::Error;
 use crate::{
     actors::{
         bootstrap::ConsumeToken,
-        user_agent::{AuthPublicKey, UserAgentConnection, auth::Outbound},
+        keyholder::KeyHolder,
+        user_agent::{AuthPublicKey, UserAgentConnection, UserAgentCredentials, auth::Outbound},
     },
-    db::schema,
+    crypto::integrity::{self, AttestationStatus},
+    db::{DatabasePool, schema::useragent_client},
 };
 
 pub struct ChallengeRequest {
@@ -40,7 +43,11 @@ smlang::statemachine!(
     }
 );
 
-async fn create_nonce(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Result<i32, Error> {
+/// Returns the current nonce, ready to use for the challenge nonce.
+async fn get_current_nonce_and_id(
+    db: &DatabasePool,
+    key: &AuthPublicKey,
+) -> Result<(i32, i32), Error> {
     let mut db_conn = db.get().await.map_err(|e| {
         error!(error = ?e, "Database pool error");
         Error::internal("Database unavailable")
@@ -48,19 +55,12 @@ async fn create_nonce(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Resu
     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)
+                useragent_client::table
+                    .filter(useragent_client::public_key.eq(key.to_stored_bytes()))
+                    .filter(useragent_client::key_type.eq(key.key_type()))
+                    .select((useragent_client::id, useragent_client::nonce))
+                    .first::<(i32, i32)>(conn)
+                    .await
             })
         })
         .await
@@ -70,12 +70,93 @@ async fn create_nonce(db: &crate::db::DatabasePool, pubkey_bytes: &[u8]) -> Resu
             Error::internal("Database operation failed")
         })?
         .ok_or_else(|| {
-            error!(?pubkey_bytes, "Public key not found in database");
+            error!(?key, "Public key not found in database");
             Error::UnregisteredPublicKey
         })
 }
 
-async fn register_key(db: &crate::db::DatabasePool, pubkey: &AuthPublicKey) -> Result<(), Error> {
+async fn verify_integrity(
+    db: &DatabasePool,
+    keyholder: &ActorRef<KeyHolder>,
+    pubkey: &AuthPublicKey,
+) -> Result<(), Error> {
+    let mut db_conn = db.get().await.map_err(|e| {
+        error!(error = ?e, "Database pool error");
+        Error::internal("Database unavailable")
+    })?;
+
+    let (id, nonce) = get_current_nonce_and_id(db, pubkey).await?;
+
+    let result = integrity::verify_entity(
+        &mut db_conn,
+        keyholder,
+        &UserAgentCredentials {
+            pubkey: pubkey.clone(),
+            nonce,
+        },
+        id,
+    )
+    .await
+    .map_err(|e| {
+        error!(?e, "Integrity verification failed");
+        Error::internal("Integrity verification failed")
+    })?;
+
+    Ok(())
+
+}
+
+async fn create_nonce(
+    db: &DatabasePool,
+    keyholder: &ActorRef<KeyHolder>,
+    pubkey: &AuthPublicKey,
+) -> Result<i32, Error> {
+    let mut db_conn = db.get().await.map_err(|e| {
+        error!(error = ?e, "Database pool error");
+        Error::internal("Database unavailable")
+    })?;
+    let new_nonce = db_conn
+        .exclusive_transaction(|conn| {
+            Box::pin(async move {
+                let (id, new_nonce): (i32, i32) = update(useragent_client::table)
+                    .filter(useragent_client::public_key.eq(pubkey.to_stored_bytes()))
+                    .filter(useragent_client::key_type.eq(pubkey.key_type()))
+                    .set(useragent_client::nonce.eq(useragent_client::nonce + 1))
+                    .returning((useragent_client::id, useragent_client::nonce))
+                    .get_result(conn)
+                    .await
+                    .map_err(|e| {
+                        error!(error = ?e, "Database error");
+                        Error::internal("Database operation failed")
+                    })?;
+
+                integrity::sign_entity(
+                    conn,
+                    keyholder,
+                    &UserAgentCredentials {
+                        pubkey: pubkey.clone(),
+                        nonce: new_nonce,
+                    },
+                    id,
+                )
+                .await
+                .map_err(|e| {
+                    error!(?e, "Integrity signature update failed");
+                    Error::internal("Database error")
+                })?;
+
+                Result::<_, Error>::Ok(new_nonce)
+            })
+        })
+        .await?;
+    Ok(new_nonce)
+}
+
+async fn register_key(
+    db: &DatabasePool,
+    keyholder: &ActorRef<KeyHolder>,
+    pubkey: &AuthPublicKey,
+) -> Result<(), Error> {
     let pubkey_bytes = pubkey.to_stored_bytes();
     let key_type = pubkey.key_type();
     let mut conn = db.get().await.map_err(|e| {
@@ -83,18 +164,40 @@ async fn register_key(db: &crate::db::DatabasePool, pubkey: &AuthPublicKey) -> R
         Error::internal("Database unavailable")
     })?;
 
-    diesel::insert_into(schema::useragent_client::table)
-        .values((
-            schema::useragent_client::public_key.eq(pubkey_bytes),
-            schema::useragent_client::nonce.eq(1),
-            schema::useragent_client::key_type.eq(key_type),
-        ))
-        .execute(&mut conn)
-        .await
-        .map_err(|e| {
-            error!(error = ?e, "Database error");
-            Error::internal("Database operation failed")
-        })?;
+    conn.transaction(|conn| {
+        Box::pin(async move {
+            const NONCE_START: i32 = 1;
+
+            let id: i32 = diesel::insert_into(useragent_client::table)
+                .values((
+                    useragent_client::public_key.eq(pubkey_bytes),
+                    useragent_client::nonce.eq(NONCE_START),
+                    useragent_client::key_type.eq(key_type),
+                ))
+                .returning(useragent_client::id)
+                .get_result(conn)
+                .await
+                .map_err(|e| {
+                    error!(error = ?e, "Database error");
+                    Error::internal("Database operation failed")
+                })?;
+
+            let entity = UserAgentCredentials {
+                pubkey: pubkey.clone(),
+                nonce: NONCE_START,
+            };
+
+            integrity::sign_entity(conn, &keyholder, &entity, id)
+                .await
+                .map_err(|e| {
+                    error!(error = ?e, "Failed to sign integrity tag for new user-agent key");
+                    Error::internal("Failed to register public key")
+                })?;
+
+            Result::<_, Error>::Ok(())
+        })
+    })
+    .await?;
 
     Ok(())
 }
@@ -120,8 +223,9 @@ where
         &mut self,
         ChallengeRequest { pubkey }: ChallengeRequest,
     ) -> Result<ChallengeContext, Self::Error> {
-        let stored_bytes = pubkey.to_stored_bytes();
-        let nonce = create_nonce(&self.conn.db, &stored_bytes).await?;
+        verify_integrity(&self.conn.db, &self.conn.actors.key_holder, &pubkey).await?;
+
+        let nonce = create_nonce(&self.conn.db, &self.conn.actors.key_holder, &pubkey).await?;
 
         self.transport
             .send(Ok(Outbound::AuthChallenge { nonce }))
@@ -161,14 +265,24 @@ where
             return Err(Error::InvalidBootstrapToken);
         }
 
-        register_key(&self.conn.db, &pubkey).await?;
-
-        self.transport
-            .send(Ok(Outbound::AuthSuccess))
-            .await
-            .map_err(|_| Error::Transport)?;
-
-        Ok(pubkey)
+        match token_ok {
+            true => {
+                register_key(&self.conn.db, &self.conn.actors.key_holder, &pubkey).await?;
+                self.transport
+                    .send(Ok(Outbound::AuthSuccess))
+                    .await
+                    .map_err(|_| Error::Transport)?;
+                Ok(pubkey)
+            }
+            false => {
+                error!("Invalid bootstrap token provided");
+                self.transport
+                    .send(Err(Error::InvalidBootstrapToken))
+                    .await
+                    .map_err(|_| Error::Transport)?;
+                Err(Error::InvalidBootstrapToken)
+            }
+        }
     }
 
     #[allow(missing_docs)]
@@ -210,16 +324,21 @@ where
             }
         };
 
-        if !valid {
-            error!("Invalid challenge solution signature");
-            return Err(Error::InvalidChallengeSolution);
+        match valid {
+            true => {
+                self.transport
+                    .send(Ok(Outbound::AuthSuccess))
+                    .await
+                    .map_err(|_| Error::Transport)?;
+                Ok(key.clone())
+            }
+            false => {
+                self.transport
+                    .send(Err(Error::InvalidChallengeSolution))
+                    .await
+                    .map_err(|_| Error::Transport)?;
+                Err(Error::InvalidChallengeSolution)
+            }
         }
-
-        self.transport
-            .send(Ok(Outbound::AuthSuccess))
-            .await
-            .map_err(|_| Error::Transport)?;
-
-        Ok(key.clone())
     }
 }

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

@@ -1,18 +1,65 @@
 use crate::{
-    actors::{GlobalActors, client::ClientProfile},
-    db::{self, models::KeyType},
+    actors::{GlobalActors, client::ClientProfile}, crypto::integrity::Integrable, db::{self, models::KeyType}
 };
 
+fn serialize_ecdsa<S>(key: &k256::ecdsa::VerifyingKey, serializer: S) -> Result<S::Ok, S::Error>
+where
+    S: serde::Serializer,
+{
+    // Serialize as hex string for easier debugging (33 bytes compressed SEC1 format)
+    let key = key.to_encoded_point(true);
+    let bytes = key.as_bytes();
+    serializer.serialize_bytes(bytes)
+}
+
+fn deserialize_ecdsa<'de, D>(deserializer: D) -> Result<k256::ecdsa::VerifyingKey, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    struct EcdsaVisitor;
+
+    impl<'de> serde::de::Visitor<'de> for EcdsaVisitor {
+        type Value = k256::ecdsa::VerifyingKey;
+
+        fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+            formatter.write_str("a compressed SEC1-encoded ECDSA public key")
+        }
+
+        fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+        where
+            E: serde::de::Error,
+        {
+            let point = k256::EncodedPoint::from_bytes(v)
+                .map_err(|_| E::custom("invalid compressed SEC1 format"))?;
+            k256::ecdsa::VerifyingKey::from_encoded_point(&point)
+                .map_err(|_| E::custom("invalid ECDSA public key"))
+        }
+    }
+
+    deserializer.deserialize_bytes(EcdsaVisitor)
+}
+
 /// Abstraction over Ed25519 / ECDSA-secp256k1 / RSA public keys used during the auth handshake.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Serialize)]
 pub enum AuthPublicKey {
     Ed25519(ed25519_dalek::VerifyingKey),
     /// Compressed SEC1 public key; signature bytes are raw 64-byte (r||s).
+    #[serde(serialize_with = "serialize_ecdsa", deserialize_with = "deserialize_ecdsa")]
     EcdsaSecp256k1(k256::ecdsa::VerifyingKey),
     /// RSA-2048+ public key (Windows Hello / KeyCredentialManager); signature bytes are PSS+SHA-256.
     Rsa(rsa::RsaPublicKey),
 }
 
+#[derive(Debug, Serialize)]
+pub struct UserAgentCredentials {
+    pub pubkey: AuthPublicKey,
+    pub nonce: i32
+}
+
+impl Integrable for UserAgentCredentials {
+    const KIND: &'static str = "useragent_credentials";
+}
+
 impl AuthPublicKey {
     /// Canonical bytes stored in DB and echoed back in the challenge.
     /// Ed25519: raw 32 bytes. ECDSA: SEC1 compressed 33 bytes. RSA: DER-encoded SPKI.
@@ -91,4 +138,5 @@ pub mod auth;
 pub mod session;
 
 pub use auth::authenticate;
+use serde::Serialize;
 pub use session::UserAgentSession;

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

@@ -5,8 +5,8 @@ use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
 use diesel::{ExpressionMethods as _, QueryDsl as _, SelectableHelper};
 use diesel_async::{AsyncConnection, RunQueryDsl};
 use kameo::error::SendError;
-use kameo::prelude::Context;
 use kameo::messages;
+use kameo::prelude::Context;
 use tracing::{error, info};
 use x25519_dalek::{EphemeralSecret, PublicKey};
 
@@ -120,6 +120,15 @@ pub enum SignTransactionError {
     Internal,
 }
 
+#[derive(Debug, Error)]
+pub enum GrantMutationError {
+    #[error("Vault is sealed")]
+    VaultSealed,
+
+    #[error("Internal grant mutation error")]
+    Internal,
+}
+
 #[messages]
 impl UserAgentSession {
     #[message]
@@ -331,7 +340,7 @@ impl UserAgentSession {
         &mut self,
         basic: crate::evm::policies::SharedGrantSettings,
         grant: crate::evm::policies::SpecificGrant,
-    ) -> Result<i32, Error> {
+    ) -> Result<i32, GrantMutationError> {
         match self
             .props
             .actors
@@ -342,13 +351,16 @@ impl UserAgentSession {
             Ok(grant_id) => Ok(grant_id),
             Err(err) => {
                 error!(?err, "EVM grant create failed");
-                Err(Error::internal("Failed to create EVM grant"))
+                Err(GrantMutationError::Internal)
             }
         }
     }
 
     #[message]
-    pub(crate) async fn handle_grant_delete(&mut self, grant_id: i32) -> Result<(), Error> {
+    pub(crate) async fn handle_grant_delete(
+        &mut self,
+        grant_id: i32,
+    ) -> Result<(), GrantMutationError> {
         match self
             .props
             .actors
@@ -359,7 +371,7 @@ impl UserAgentSession {
             Ok(()) => Ok(()),
             Err(err) => {
                 error!(?err, "EVM grant delete failed");
-                Err(Error::internal("Failed to delete EVM grant"))
+                Err(GrantMutationError::Internal)
             }
         }
     }

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

@@ -1,6 +1,5 @@
 use std::sync::Arc;
 
-use miette::Diagnostic;
 use thiserror::Error;
 
 use crate::{
@@ -11,30 +10,24 @@ use crate::{
 
 pub mod tls;
 
-#[derive(Error, Debug, Diagnostic)]
+#[derive(Error, Debug)]
 pub enum InitError {
     #[error("Database setup failed: {0}")]
-    #[diagnostic(code(arbiter_server::init::database_setup))]
     DatabaseSetup(#[from] db::DatabaseSetupError),
 
     #[error("Connection acquire failed: {0}")]
-    #[diagnostic(code(arbiter_server::init::database_pool))]
     DatabasePool(#[from] db::PoolError),
 
     #[error("Database query error: {0}")]
-    #[diagnostic(code(arbiter_server::init::database_query))]
     DatabaseQuery(#[from] diesel::result::Error),
 
     #[error("TLS initialization failed: {0}")]
-    #[diagnostic(code(arbiter_server::init::tls_init))]
     Tls(#[from] tls::InitError),
 
     #[error("Actor spawn failed: {0}")]
-    #[diagnostic(code(arbiter_server::init::actor_spawn))]
     ActorSpawn(#[from] crate::actors::SpawnError),
 
     #[error("I/O Error: {0}")]
-    #[diagnostic(code(arbiter_server::init::io))]
     Io(#[from] std::io::Error),
 }
 

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

@@ -1,8 +1,8 @@
-use std::{net::IpAddr, string::FromUtf8Error};
+use std::{net::Ipv4Addr, string::FromUtf8Error};
 
 use diesel::{ExpressionMethods as _, QueryDsl, SelectableHelper as _};
 use diesel_async::{AsyncConnection, RunQueryDsl};
-use miette::Diagnostic;
+
 use pem::Pem;
 use rcgen::{
     BasicConstraints, Certificate, CertificateParams, CertifiedIssuer, DistinguishedName, DnType,
@@ -29,30 +29,24 @@ const ENCODE_CONFIG: pem::EncodeConfig = {
     pem::EncodeConfig::new().set_line_ending(line_ending)
 };
 
-#[derive(Error, Debug, Diagnostic)]
+#[derive(Error, Debug)]
 pub enum InitError {
     #[error("Key generation error during TLS initialization: {0}")]
-    #[diagnostic(code(arbiter_server::tls_init::key_generation))]
     KeyGeneration(#[from] rcgen::Error),
 
     #[error("Key invalid format: {0}")]
-    #[diagnostic(code(arbiter_server::tls_init::key_invalid_format))]
     KeyInvalidFormat(#[from] FromUtf8Error),
 
     #[error("Key deserialization error: {0}")]
-    #[diagnostic(code(arbiter_server::tls_init::key_deserialization))]
     KeyDeserializationError(rcgen::Error),
 
     #[error("Database error during TLS initialization: {0}")]
-    #[diagnostic(code(arbiter_server::tls_init::database_error))]
     DatabaseError(#[from] diesel::result::Error),
 
     #[error("Pem deserialization error during TLS initialization: {0}")]
-    #[diagnostic(code(arbiter_server::tls_init::pem_deserialization))]
     PemDeserializationError(#[from] rustls::pki_types::pem::Error),
 
     #[error("Database pool acquire error during TLS initialization: {0}")]
-    #[diagnostic(code(arbiter_server::tls_init::database_pool_acquire))]
     DatabasePoolAcquire(#[from] db::PoolError),
 }
 
@@ -116,9 +110,7 @@ impl TlsCa {
         ];
         params
             .subject_alt_names
-            .push(SanType::IpAddress(IpAddr::from([
-                127, 0, 0, 1,
-            ])));
+            .push(SanType::IpAddress(Ipv4Addr::LOCALHOST.into()));
 
         let mut dn = DistinguishedName::new();
         dn.push(DnType::CommonName, "Arbiter Instance Leaf");

server/crates/arbiter-server/src/crypto/encryption/mod.rs

@@ -0,0 +1,3 @@
+pub mod v1;
+
+pub use v1::*;

server/crates/arbiter-server/src/crypto/encryption/v1.rs

@@ -0,0 +1,109 @@
+use argon2::password_hash::Salt as ArgonSalt;
+
+use rand::{
+    Rng as _, SeedableRng,
+    rngs::{StdRng, SysRng},
+};
+
+pub const ROOT_KEY_TAG: &[u8] = "arbiter/seal/v1".as_bytes();
+pub const TAG: &[u8] = "arbiter/private-key/v1".as_bytes();
+
+pub const NONCE_LENGTH: usize = 24;
+
+#[derive(Default)]
+pub struct Nonce(pub [u8; NONCE_LENGTH]);
+impl Nonce {
+    pub fn increment(&mut self) {
+        for i in (0..self.0.len()).rev() {
+            if self.0[i] == 0xFF {
+                self.0[i] = 0;
+            } else {
+                self.0[i] += 1;
+                break;
+            }
+        }
+    }
+
+    pub fn to_vec(&self) -> Vec<u8> {
+        self.0.to_vec()
+    }
+}
+impl<'a> TryFrom<&'a [u8]> for Nonce {
+    type Error = ();
+
+    fn try_from(value: &'a [u8]) -> Result<Self, Self::Error> {
+        if value.len() != NONCE_LENGTH {
+            return Err(());
+        }
+        let mut nonce = [0u8; NONCE_LENGTH];
+        nonce.copy_from_slice(value);
+        Ok(Self(nonce))
+    }
+}
+
+pub type Salt = [u8; ArgonSalt::RECOMMENDED_LENGTH];
+
+pub fn generate_salt() -> Salt {
+    let mut salt = Salt::default();
+    #[allow(
+        clippy::unwrap_used,
+        reason = "Rng failure is unrecoverable and should panic"
+    )]
+    let mut rng = StdRng::try_from_rng(&mut SysRng).unwrap();
+    rng.fill_bytes(&mut salt);
+    salt
+}
+
+#[cfg(test)]
+mod tests {
+    use std::ops::Deref as _;
+
+    use super::*;
+    use crate::{
+        crypto::derive_key,
+        safe_cell::{SafeCell, SafeCellHandle as _},
+    };
+
+    #[test]
+    pub fn derive_seal_key_deterministic() {
+        static PASSWORD: &[u8] = b"password";
+        let password = SafeCell::new(PASSWORD.to_vec());
+        let password2 = SafeCell::new(PASSWORD.to_vec());
+        let salt = generate_salt();
+
+        let mut key1 = derive_key(password, &salt);
+        let mut key2 = derive_key(password2, &salt);
+
+        let key1_reader = key1.0.read();
+        let key2_reader = key2.0.read();
+
+        assert_eq!(key1_reader.deref(), key2_reader.deref());
+    }
+
+    #[test]
+    pub fn successful_derive() {
+        static PASSWORD: &[u8] = b"password";
+        let password = SafeCell::new(PASSWORD.to_vec());
+        let salt = generate_salt();
+
+        let mut key = derive_key(password, &salt);
+        let key_reader = key.0.read();
+        let key_ref = key_reader.deref();
+
+        assert_ne!(key_ref.as_slice(), &[0u8; 32][..]);
+    }
+
+    #[test]
+    // We should fuzz this
+    pub fn test_nonce_increment() {
+        let mut nonce = Nonce([0u8; NONCE_LENGTH]);
+        nonce.increment();
+
+        assert_eq!(
+            nonce.0,
+            [
+                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
+            ]
+        );
+    }
+}

server/crates/arbiter-server/src/crypto/integrity/mod.rs

@@ -0,0 +1,3 @@
+pub mod v1;
+
+pub use v1::*;

server/crates/arbiter-server/src/crypto/integrity/v1.rs

@@ -0,0 +1,319 @@
+use crate::{actors::keyholder, crypto::KeyCell,safe_cell::SafeCellHandle as _};
+use chacha20poly1305::Key;
+use hmac::{Hmac, Mac as _};
+use serde::Serialize;
+use sha2::Sha256;
+
+use diesel::{ExpressionMethods as _, QueryDsl, dsl::insert_into, sqlite::Sqlite};
+use diesel_async::{AsyncConnection, RunQueryDsl};
+use kameo::{actor::ActorRef, error::SendError};
+use sha2::Digest as _;
+
+use crate::{
+    actors::keyholder::{KeyHolder, SignIntegrity, VerifyIntegrity},
+    db::{
+        self,
+        models::{IntegrityEnvelope, NewIntegrityEnvelope},
+        schema::integrity_envelope,
+    },
+};
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("Database error: {0}")]
+    Database(#[from] db::DatabaseError),
+
+    #[error("KeyHolder error: {0}")]
+    Keyholder(#[from] keyholder::Error),
+
+    #[error("KeyHolder mailbox error")]
+    KeyholderSend,
+
+    #[error("Integrity envelope is missing for entity {entity_kind}")]
+    MissingEnvelope { entity_kind: &'static str },
+
+    #[error(
+        "Integrity payload version mismatch for entity {entity_kind}: expected {expected}, found {found}"
+    )]
+    PayloadVersionMismatch {
+        entity_kind: &'static str,
+        expected: i32,
+        found: i32,
+    },
+
+    #[error("Integrity MAC mismatch for entity {entity_kind}")]
+    MacMismatch { entity_kind: &'static str },
+
+    #[error("Payload serialization error: {0}")]
+    PayloadSerialization(#[from] postcard::Error),
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum AttestationStatus {
+    Attested,
+    Unavailable,
+}
+
+pub const CURRENT_PAYLOAD_VERSION: i32 = 1;
+pub const INTEGRITY_SUBKEY_TAG: &[u8] = b"arbiter/db-integrity-key/v1";
+
+pub type HmacSha256 = Hmac<Sha256>;
+
+pub trait Integrable: Serialize {
+    const KIND: &'static str;
+    const VERSION: i32 = 1;
+}
+
+fn payload_hash(payload: &[u8]) -> [u8; 32] {
+    Sha256::digest(payload).into()
+}
+
+fn push_len_prefixed(out: &mut Vec<u8>, bytes: &[u8]) {
+    out.extend_from_slice(&(bytes.len() as u32).to_be_bytes());
+    out.extend_from_slice(bytes);
+}
+
+fn build_mac_input(
+    entity_kind: &str,
+    entity_id: &[u8],
+    payload_version: i32,
+    payload_hash: &[u8; 32],
+) -> Vec<u8> {
+    let mut out = Vec::with_capacity(8 + entity_kind.len() + entity_id.len() + 32);
+    push_len_prefixed(&mut out, entity_kind.as_bytes());
+    push_len_prefixed(&mut out, entity_id);
+    out.extend_from_slice(&payload_version.to_be_bytes());
+    out.extend_from_slice(payload_hash);
+    out
+}
+
+pub trait IntoId {
+    fn into_id(self) -> Vec<u8>;
+}
+
+impl IntoId for i32 {
+    fn into_id(self) -> Vec<u8> {
+        self.to_be_bytes().to_vec()
+    }
+}
+
+impl IntoId for &'_ [u8] {
+    fn into_id(self) -> Vec<u8> {
+        self.to_vec()
+    }
+}
+
+pub async fn sign_entity<E: Integrable>(
+    conn: &mut impl AsyncConnection<Backend = Sqlite>,
+    keyholder: &ActorRef<KeyHolder>,
+    entity: &E,
+    entity_id: impl IntoId,
+) -> Result<(), Error> {
+    let payload = postcard::to_stdvec(entity)?;
+    let payload_hash = payload_hash(&payload);
+
+    let entity_id = entity_id.into_id();
+
+    let mac_input = build_mac_input(E::KIND, &entity_id, E::VERSION, &payload_hash);
+
+    let (key_version, mac) = keyholder
+        .ask(SignIntegrity { mac_input })
+        .await
+        .map_err(|err| match err {
+            kameo::error::SendError::HandlerError(inner) => Error::Keyholder(inner),
+            _ => Error::KeyholderSend,
+        })?;
+
+    insert_into(integrity_envelope::table)
+        .values(NewIntegrityEnvelope {
+            entity_kind: E::KIND.to_owned(),
+            entity_id: entity_id,
+            payload_version: E::VERSION ,
+            key_version,
+            mac: mac.to_vec(),
+        })
+        .on_conflict((
+            integrity_envelope::entity_id,
+            integrity_envelope::entity_kind,
+        ))
+        .do_update()
+        .set((
+            integrity_envelope::payload_version.eq(E::VERSION),
+            integrity_envelope::key_version.eq(key_version),
+            integrity_envelope::mac.eq(mac),
+        ))
+        .execute(conn)
+        .await
+        .map_err(db::DatabaseError::from)?;
+
+    Ok(())
+}
+
+pub async fn verify_entity<E: Integrable>(
+    conn: &mut impl AsyncConnection<Backend = Sqlite>,
+    keyholder: &ActorRef<KeyHolder>,
+    entity: &E,
+    entity_id: impl IntoId,
+) -> Result<AttestationStatus, Error> {
+    let entity_id = entity_id.into_id();
+    let envelope: IntegrityEnvelope = integrity_envelope::table
+        .filter(integrity_envelope::entity_kind.eq(E::KIND))
+        .filter(integrity_envelope::entity_id.eq(&entity_id))
+        .first(conn)
+        .await
+        .map_err(|err| match err {
+            diesel::result::Error::NotFound => Error::MissingEnvelope { entity_kind: E::KIND },
+            other => Error::Database(db::DatabaseError::from(other)),
+        })?;
+
+    if envelope.payload_version != E::VERSION {
+        return Err(Error::PayloadVersionMismatch {
+            entity_kind: E::KIND,
+            expected: E::VERSION,
+            found: envelope.payload_version,
+        });
+    }
+
+    let payload = postcard::to_stdvec(entity)?;
+    let payload_hash = payload_hash(&payload);
+    let mac_input = build_mac_input(
+        E::KIND,
+        &entity_id,
+        envelope.payload_version,
+        &payload_hash,
+    );
+
+    let result = keyholder
+        .ask(VerifyIntegrity {
+            mac_input,
+            expected_mac: envelope.mac,
+            key_version: envelope.key_version,
+        })
+        .await
+        ;
+
+    match result {
+        Ok(true) => Ok(AttestationStatus::Attested),
+        Ok(false) => Err(Error::MacMismatch { entity_kind: E::KIND }),
+        Err(SendError::HandlerError(keyholder::Error::NotBootstrapped)) => Ok(AttestationStatus::Unavailable),
+        Err(_) => Err(Error::KeyholderSend),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use diesel::{ExpressionMethods as _, QueryDsl};
+    use diesel_async::RunQueryDsl;
+    use kameo::{actor::ActorRef, prelude::Spawn};
+
+    use crate::{
+        actors::keyholder::{Bootstrap, KeyHolder},
+        db::{self, schema},
+        safe_cell::{SafeCell, SafeCellHandle as _},
+    };
+
+    use super::{Error, Integrable, sign_entity, verify_entity};
+
+    #[derive(Clone, serde::Serialize)]
+    struct DummyEntity {
+        payload_version: i32,
+        payload: Vec<u8>,
+    }
+
+    impl Integrable for DummyEntity {
+        const KIND: &'static str = "dummy_entity";
+    }
+
+    async fn bootstrapped_keyholder(db: &db::DatabasePool) -> ActorRef<KeyHolder> {
+        let actor = KeyHolder::spawn(KeyHolder::new(db.clone()).await.unwrap());
+        actor
+            .ask(Bootstrap {
+                seal_key_raw: SafeCell::new(b"integrity-test-seal-key".to_vec()),
+            })
+            .await
+            .unwrap();
+        actor
+    }
+
+    #[tokio::test]
+    async fn sign_writes_envelope_and_verify_passes() {
+        let db = db::create_test_pool().await;
+        let keyholder = bootstrapped_keyholder(&db).await;
+        let mut conn = db.get().await.unwrap();
+
+        const ENTITY_ID: &[u8] = b"entity-id-7";
+
+        let entity = DummyEntity {
+            payload_version: 1,
+            payload: b"payload-v1".to_vec(),
+        };
+
+        sign_entity(&mut conn, &keyholder, &entity, ENTITY_ID).await.unwrap();
+
+        let count: i64 = schema::integrity_envelope::table
+            .filter(schema::integrity_envelope::entity_kind.eq("dummy_entity"))
+            .filter(schema::integrity_envelope::entity_id.eq(ENTITY_ID))
+            .count()
+            .get_result(&mut conn)
+            .await
+            .unwrap();
+
+        assert_eq!(count, 1, "envelope row must be created exactly once");
+        verify_entity(&mut conn, &keyholder, &entity, ENTITY_ID).await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn tampered_mac_fails_verification() {
+        let db = db::create_test_pool().await;
+        let keyholder = bootstrapped_keyholder(&db).await;
+        let mut conn = db.get().await.unwrap();
+
+        const ENTITY_ID: &[u8] = b"entity-id-11";
+
+        let entity = DummyEntity {
+            payload_version: 1,
+            payload: b"payload-v1".to_vec(),
+        };
+
+        sign_entity(&mut conn, &keyholder, &entity, ENTITY_ID).await.unwrap();
+
+        diesel::update(schema::integrity_envelope::table)
+            .filter(schema::integrity_envelope::entity_kind.eq("dummy_entity"))
+            .filter(schema::integrity_envelope::entity_id.eq(ENTITY_ID))
+            .set(schema::integrity_envelope::mac.eq(vec![0u8; 32]))
+            .execute(&mut conn)
+            .await
+            .unwrap();
+
+        let err = verify_entity(&mut conn, &keyholder, &entity, ENTITY_ID)
+            .await
+            .unwrap_err();
+        assert!(matches!(err, Error::MacMismatch { .. }));
+    }
+
+    #[tokio::test]
+    async fn changed_payload_fails_verification() {
+        let db = db::create_test_pool().await;
+        let keyholder = bootstrapped_keyholder(&db).await;
+        let mut conn = db.get().await.unwrap();
+
+        const ENTITY_ID: &[u8] = b"entity-id-21";
+
+        let entity = DummyEntity {
+            payload_version: 1,
+            payload: b"payload-v1".to_vec(),
+        };
+
+        sign_entity(&mut conn, &keyholder, &entity, ENTITY_ID).await.unwrap();
+
+        let tampered = DummyEntity {
+            payload: b"payload-v1-but-tampered".to_vec(),
+            ..entity
+        };
+
+        let err = verify_entity(&mut conn, &keyholder, &tampered, ENTITY_ID)
+            .await
+            .unwrap_err();
+        assert!(matches!(err, Error::MacMismatch { .. }));
+    }
+}

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

@@ -1,52 +1,21 @@
 use std::ops::Deref as _;
 
-use argon2::{Algorithm, Argon2, password_hash::Salt as ArgonSalt};
+use argon2::{Algorithm, Argon2};
 use chacha20poly1305::{
     AeadInPlace, Key, KeyInit as _, XChaCha20Poly1305, XNonce,
     aead::{AeadMut, Error, Payload},
 };
 use rand::{
-    Rng as _, SeedableRng,
+    Rng as _, SeedableRng as _,
     rngs::{StdRng, SysRng},
 };
 
 use crate::safe_cell::{SafeCell, SafeCellHandle as _};
 
-pub const ROOT_KEY_TAG: &[u8] = "arbiter/seal/v1".as_bytes();
-pub const TAG: &[u8] = "arbiter/private-key/v1".as_bytes();
+pub mod encryption;
+pub mod integrity;
 
-pub const NONCE_LENGTH: usize = 24;
-
-#[derive(Default)]
-pub struct Nonce([u8; NONCE_LENGTH]);
-impl Nonce {
-    pub fn increment(&mut self) {
-        for i in (0..self.0.len()).rev() {
-            if self.0[i] == 0xFF {
-                self.0[i] = 0;
-            } else {
-                self.0[i] += 1;
-                break;
-            }
-        }
-    }
-
-    pub fn to_vec(&self) -> Vec<u8> {
-        self.0.to_vec()
-    }
-}
-impl<'a> TryFrom<&'a [u8]> for Nonce {
-    type Error = ();
-
-    fn try_from(value: &'a [u8]) -> Result<Self, Self::Error> {
-        if value.len() != NONCE_LENGTH {
-            return Err(());
-        }
-        let mut nonce = [0u8; NONCE_LENGTH];
-        nonce.copy_from_slice(value);
-        Ok(Self(nonce))
-    }
-}
+use encryption::v1::{Nonce, Salt};
 
 pub struct KeyCell(pub SafeCell<Key>);
 impl From<SafeCell<Key>> for KeyCell {
@@ -133,22 +102,9 @@ impl KeyCell {
     }
 }
 
-pub type Salt = [u8; ArgonSalt::RECOMMENDED_LENGTH];
-
-pub fn generate_salt() -> Salt {
-    let mut salt = Salt::default();
-    #[allow(
-        clippy::unwrap_used,
-        reason = "Rng failure is unrecoverable and should panic"
-    )]
-    let mut rng = StdRng::try_from_rng(&mut SysRng).unwrap();
-    rng.fill_bytes(&mut salt);
-    salt
-}
-
 /// User password might be of different length, have not enough entropy, etc...
 /// Derive a fixed-length key from the password using Argon2id, which is designed for password hashing and key derivation.
-pub fn derive_seal_key(mut password: SafeCell<Vec<u8>>, salt: &Salt) -> KeyCell {
+pub fn derive_key(mut password: SafeCell<Vec<u8>>, salt: &Salt) -> KeyCell {
     #[allow(clippy::unwrap_used)]
     let params = argon2::Params::new(262_144, 3, 4, None).unwrap();
     let hasher = Argon2::new(Algorithm::Argon2id, argon2::Version::V0x13, params);
@@ -171,37 +127,11 @@ pub fn derive_seal_key(mut password: SafeCell<Vec<u8>>, salt: &Salt) -> KeyCell
 
 #[cfg(test)]
 mod tests {
-    use super::*;
-    use crate::safe_cell::SafeCell;
-
-    #[test]
-    pub fn derive_seal_key_deterministic() {
-        static PASSWORD: &[u8] = b"password";
-        let password = SafeCell::new(PASSWORD.to_vec());
-        let password2 = SafeCell::new(PASSWORD.to_vec());
-        let salt = generate_salt();
-
-        let mut key1 = derive_seal_key(password, &salt);
-        let mut key2 = derive_seal_key(password2, &salt);
-
-        let key1_reader = key1.0.read();
-        let key2_reader = key2.0.read();
-
-        assert_eq!(key1_reader.deref(), key2_reader.deref());
-    }
-
-    #[test]
-    pub fn successful_derive() {
-        static PASSWORD: &[u8] = b"password";
-        let password = SafeCell::new(PASSWORD.to_vec());
-        let salt = generate_salt();
-
-        let mut key = derive_seal_key(password, &salt);
-        let key_reader = key.0.read();
-        let key_ref = key_reader.deref();
-
-        assert_ne!(key_ref.as_slice(), &[0u8; 32][..]);
-    }
+    use super::{
+        derive_key,
+        encryption::v1::{Nonce, generate_salt},
+    };
+    use crate::safe_cell::{SafeCell, SafeCellHandle as _};
 
     #[test]
     pub fn encrypt_decrypt() {
@@ -209,7 +139,7 @@ mod tests {
         let password = SafeCell::new(PASSWORD.to_vec());
         let salt = generate_salt();
 
-        let mut key = derive_seal_key(password, &salt);
+        let mut key = derive_key(password, &salt);
         let nonce = Nonce(*b"unique nonce 123 1231233"); // 24 bytes for XChaCha20Poly1305
         let associated_data = b"associated data";
         let mut buffer = b"secret data".to_vec();
@@ -226,18 +156,4 @@ mod tests {
         let buffer = buffer.read();
         assert_eq!(*buffer, b"secret data");
     }
-
-    #[test]
-    // We should fuzz this
-    pub fn test_nonce_increment() {
-        let mut nonce = Nonce([0u8; NONCE_LENGTH]);
-        nonce.increment();
-
-        assert_eq!(
-            nonce.0,
-            [
-                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
-            ]
-        );
-    }
 }

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

@@ -5,7 +5,7 @@ use diesel_async::{
     sync_connection_wrapper::SyncConnectionWrapper,
 };
 use diesel_migrations::{EmbeddedMigrations, MigrationHarness, embed_migrations};
-use miette::Diagnostic;
+
 use thiserror::Error;
 use tracing::info;
 
@@ -21,26 +21,21 @@ static DB_FILE: &str = "arbiter.sqlite";
 
 const MIGRATIONS: EmbeddedMigrations = embed_migrations!("migrations");
 
-#[derive(Error, Diagnostic, Debug)]
+#[derive(Error, Debug)]
 pub enum DatabaseSetupError {
     #[error("Failed to determine home directory")]
-    #[diagnostic(code(arbiter::db::home_dir))]
     HomeDir(std::io::Error),
 
     #[error(transparent)]
-    #[diagnostic(code(arbiter::db::connection))]
     Connection(diesel::ConnectionError),
 
     #[error(transparent)]
-    #[diagnostic(code(arbiter::db::concurrency))]
     ConcurrencySetup(diesel::result::Error),
 
     #[error(transparent)]
-    #[diagnostic(code(arbiter::db::migration))]
     Migration(Box<dyn std::error::Error + Send + Sync>),
 
     #[error(transparent)]
-    #[diagnostic(code(arbiter::db::pool))]
     Pool(#[from] PoolInitError),
 }
 

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

@@ -5,7 +5,7 @@ use crate::db::schema::{
     self, aead_encrypted, arbiter_settings, evm_basic_grant, evm_ether_transfer_grant,
     evm_ether_transfer_grant_target, evm_ether_transfer_limit, evm_token_transfer_grant,
     evm_token_transfer_log, evm_token_transfer_volume_limit, evm_transaction_log, evm_wallet,
-    root_key_history, tls_history,
+    integrity_envelope, root_key_history, tls_history,
 };
 use chrono::{DateTime, Utc};
 use diesel::{prelude::*, sqlite::Sqlite};
@@ -376,3 +376,22 @@ pub struct EvmTokenTransferLog {
     pub value: Vec<u8>,
     pub created_at: SqliteTimestamp,
 }
+
+#[derive(Models, Queryable, Debug, Insertable, Selectable)]
+#[diesel(table_name = integrity_envelope, check_for_backend(Sqlite))]
+#[view(
+    NewIntegrityEnvelope,
+    derive(Insertable),
+    omit(id, signed_at, created_at),
+    attributes_with = "deriveless"
+)]
+pub struct IntegrityEnvelope {
+    pub id: i32,
+    pub entity_kind: String,
+    pub entity_id: Vec<u8>,
+    pub payload_version: i32,
+    pub key_version: i32,
+    pub mac: Vec<u8>,
+    pub signed_at: SqliteTimestamp,
+    pub created_at: SqliteTimestamp,
+}

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

@@ -139,6 +139,19 @@ diesel::table! {
     }
 }
 
+diesel::table! {
+    integrity_envelope (id) {
+        id -> Integer,
+        entity_kind -> Text,
+        entity_id -> Binary,
+        payload_version -> Integer,
+        key_version -> Integer,
+        mac -> Binary,
+        signed_at -> Integer,
+        created_at -> Integer,
+    }
+}
+
 diesel::table! {
     program_client (id) {
         id -> Integer,
@@ -219,6 +232,7 @@ diesel::allow_tables_to_appear_in_same_query!(
     evm_transaction_log,
     evm_wallet,
     evm_wallet_access,
+    integrity_envelope,
     program_client,
     root_key_history,
     tls_history,

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

@@ -8,8 +8,11 @@ use alloy::{
 use chrono::Utc;
 use diesel::{ExpressionMethods as _, QueryDsl as _, QueryResult, insert_into, sqlite::Sqlite};
 use diesel_async::{AsyncConnection, RunQueryDsl};
+use kameo::actor::ActorRef;
 
 use crate::{
+    actors::keyholder::KeyHolder,
+    crypto::integrity,
     db::{
         self, DatabaseError,
         models::{
@@ -18,7 +21,7 @@ use crate::{
         schema::{self, evm_transaction_log},
     },
     evm::policies::{
-        DatabaseID, EvalContext, EvalViolation, FullGrant, Grant, Policy, SharedGrantSettings,
+        DatabaseID, EvalContext, EvalViolation, Grant, Policy, CombinedSettings, SharedGrantSettings,
         SpecificGrant, SpecificMeaning, ether_transfer::EtherTransfer,
         token_transfers::TokenTransfer,
     },
@@ -28,42 +31,47 @@ pub mod policies;
 mod utils;
 
 /// Errors that can only occur once the transaction meaning is known (during policy evaluation)
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
+#[derive(Debug, thiserror::Error)]
 pub enum PolicyError {
     #[error("Database error")]
     Database(#[from] crate::db::DatabaseError),
     #[error("Transaction violates policy: {0:?}")]
-    #[diagnostic(code(arbiter_server::evm::policy_error::violation))]
     Violations(Vec<EvalViolation>),
     #[error("No matching grant found")]
-    #[diagnostic(code(arbiter_server::evm::policy_error::no_matching_grant))]
     NoMatchingGrant,
+
+    #[error("Integrity error: {0}")]
+    Integrity(#[from] integrity::Error),
 }
 
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
+#[derive(Debug, thiserror::Error)]
 pub enum VetError {
     #[error("Contract creation transactions are not supported")]
-    #[diagnostic(code(arbiter_server::evm::vet_error::contract_creation_unsupported))]
     ContractCreationNotSupported,
     #[error("Engine can't classify this transaction")]
-    #[diagnostic(code(arbiter_server::evm::vet_error::unsupported))]
     UnsupportedTransactionType,
     #[error("Policy evaluation failed: {1}")]
-    #[diagnostic(code(arbiter_server::evm::vet_error::evaluated))]
     Evaluated(SpecificMeaning, #[source] PolicyError),
 }
 
-#[derive(Debug, thiserror::Error, miette::Diagnostic)]
+#[derive(Debug, thiserror::Error)]
 pub enum AnalyzeError {
     #[error("Engine doesn't support granting permissions for contract creation")]
-    #[diagnostic(code(arbiter_server::evm::analyze_error::contract_creation_not_supported))]
     ContractCreationNotSupported,
 
     #[error("Unsupported transaction type")]
-    #[diagnostic(code(arbiter_server::evm::analyze_error::unsupported_transaction_type))]
     UnsupportedTransactionType,
 }
 
+#[derive(Debug, thiserror::Error)]
+pub enum ListError {
+    #[error("Database error")]
+    Database(#[from] crate::db::DatabaseError),
+
+    #[error("Integrity verification failed for grant")]
+    Integrity(#[from] integrity::Error),
+}
+
 /// Controls whether a transaction should be executed or only validated
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum RunKind {
@@ -122,6 +130,7 @@ async fn check_shared_constraints(
 // Supporting only EIP-1559 transactions for now, but we can easily extend this to support legacy transactions if needed
 pub struct Engine {
     db: db::DatabasePool,
+    keyholder: ActorRef<KeyHolder>,
 }
 
 impl Engine {
@@ -130,7 +139,10 @@ impl Engine {
         context: EvalContext,
         meaning: &P::Meaning,
         run_kind: RunKind,
-    ) -> Result<(), PolicyError> {
+    ) -> Result<(), PolicyError>
+    where
+        P::Settings: Clone,
+    {
         let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
 
         let grant = P::try_find_grant(&context, &mut conn)
@@ -138,10 +150,16 @@ impl Engine {
             .map_err(DatabaseError::from)?
             .ok_or(PolicyError::NoMatchingGrant)?;
 
-        let mut violations =
-            check_shared_constraints(&context, &grant.shared, grant.shared_grant_id, &mut conn)
-                .await
-                .map_err(DatabaseError::from)?;
+        integrity::verify_entity(&mut conn, &self.keyholder, &grant.settings, grant.id).await?;
+
+        let mut violations = check_shared_constraints(
+            &context,
+            &grant.settings.shared,
+            grant.common_settings_id,
+            &mut conn,
+        )
+        .await
+        .map_err(DatabaseError::from)?;
         violations.extend(
             P::evaluate(&context, meaning, &grant, &mut conn)
                 .await
@@ -150,12 +168,14 @@ impl Engine {
 
         if !violations.is_empty() {
             return Err(PolicyError::Violations(violations));
-        } else if run_kind == RunKind::Execution {
+        }
+
+        if run_kind == RunKind::Execution {
             conn.transaction(|conn| {
                 Box::pin(async move {
                     let log_id: i32 = insert_into(evm_transaction_log::table)
                         .values(&NewEvmTransactionLog {
-                            grant_id: grant.shared_grant_id,
+                            grant_id: grant.common_settings_id,
                             wallet_access_id: context.target.id,
                             chain_id: context.chain as i32,
                             eth_value: utils::u256_to_bytes(context.value).to_vec(),
@@ -179,15 +199,19 @@ impl Engine {
 }
 
 impl Engine {
-    pub fn new(db: db::DatabasePool) -> Self {
-        Self { db }
+    pub fn new(db: db::DatabasePool, keyholder: ActorRef<KeyHolder>) -> Self {
+        Self { db, keyholder }
     }
 
     pub async fn create_grant<P: Policy>(
         &self,
-        full_grant: FullGrant<P::Settings>,
-    ) -> Result<i32, DatabaseError> {
+        full_grant: CombinedSettings<P::Settings>,
+    ) -> Result<i32, DatabaseError>
+    where
+        P::Settings: Clone,
+    {
         let mut conn = self.db.get().await?;
+        let keyholder = self.keyholder.clone();
 
         let id = conn
             .transaction(|conn| {
@@ -196,25 +220,25 @@ impl Engine {
 
                     let basic_grant: EvmBasicGrant = insert_into(evm_basic_grant::table)
                         .values(&NewEvmBasicGrant {
-                            chain_id: full_grant.basic.chain as i32,
-                            wallet_access_id: full_grant.basic.wallet_access_id,
-                            valid_from: full_grant.basic.valid_from.map(SqliteTimestamp),
-                            valid_until: full_grant.basic.valid_until.map(SqliteTimestamp),
+                            chain_id: full_grant.shared.chain as i32,
+                            wallet_access_id: full_grant.shared.wallet_access_id,
+                            valid_from: full_grant.shared.valid_from.map(SqliteTimestamp),
+                            valid_until: full_grant.shared.valid_until.map(SqliteTimestamp),
                             max_gas_fee_per_gas: full_grant
-                                .basic
+                                .shared
                                 .max_gas_fee_per_gas
                                 .map(|fee| utils::u256_to_bytes(fee).to_vec()),
                             max_priority_fee_per_gas: full_grant
-                                .basic
+                                .shared
                                 .max_priority_fee_per_gas
                                 .map(|fee| utils::u256_to_bytes(fee).to_vec()),
                             rate_limit_count: full_grant
-                                .basic
+                                .shared
                                 .rate_limit
                                 .as_ref()
                                 .map(|rl| rl.count as i32),
                             rate_limit_window_secs: full_grant
-                                .basic
+                                .shared
                                 .rate_limit
                                 .as_ref()
                                 .map(|rl| rl.window.num_seconds() as i32),
@@ -224,7 +248,18 @@ impl Engine {
                         .get_result(conn)
                         .await?;
 
-                    P::create_grant(&basic_grant, &full_grant.specific, conn).await
+                    P::create_grant(&basic_grant, &full_grant.specific, conn).await?;
+
+                    integrity::sign_entity(
+                        conn,
+                        &keyholder,
+                        &full_grant,
+                    basic_grant.id,
+                    )
+                    .await
+                    .map_err(|_| diesel::result::Error::RollbackTransaction)?;
+
+                    QueryResult::Ok(basic_grant.id)
                 })
             })
             .await?;
@@ -232,33 +267,36 @@ impl Engine {
         Ok(id)
     }
 
-    pub async fn list_all_grants(&self) -> Result<Vec<Grant<SpecificGrant>>, DatabaseError> {
-        let mut conn = self.db.get().await?;
+    async fn list_one_kind<Kind: Policy, Y>(
+        &self,
+        conn: &mut impl AsyncConnection<Backend = Sqlite>,
+    ) -> Result<impl Iterator<Item = Grant<Y>>, ListError>
+    where
+        Y: From<Kind::Settings>,
+    {
+        let all_grants = Kind::find_all_grants(conn)
+            .await
+            .map_err(DatabaseError::from)?;
+
+        // Verify integrity of all grants before returning any results
+        for grant in &all_grants {
+            integrity::verify_entity(conn, &self.keyholder, &grant.settings, grant.id).await?;
+        }
+
+        Ok(all_grants.into_iter().map(|g| Grant {
+            id: g.id,
+            common_settings_id: g.common_settings_id,
+            settings: g.settings.generalize(),
+        }))
+    }
+
+    pub async fn list_all_grants(&self) -> Result<Vec<Grant<SpecificGrant>>, ListError> {
+        let mut conn = self.db.get().await.map_err(DatabaseError::from)?;
 
         let mut grants: Vec<Grant<SpecificGrant>> = Vec::new();
 
-        grants.extend(
-            EtherTransfer::find_all_grants(&mut conn)
-                .await?
-                .into_iter()
-                .map(|g| Grant {
-                    id: g.id,
-                    shared_grant_id: g.shared_grant_id,
-                    shared: g.shared,
-                    settings: SpecificGrant::EtherTransfer(g.settings),
-                }),
-        );
-        grants.extend(
-            TokenTransfer::find_all_grants(&mut conn)
-                .await?
-                .into_iter()
-                .map(|g| Grant {
-                    id: g.id,
-                    shared_grant_id: g.shared_grant_id,
-                    shared: g.shared,
-                    settings: SpecificGrant::TokenTransfer(g.settings),
-                }),
-        );
+        grants.extend(self.list_one_kind::<EtherTransfer, _>(&mut conn).await?);
+        grants.extend(self.list_one_kind::<TokenTransfer, _>(&mut conn).await?);
 
         Ok(grants)
     }

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

@@ -6,12 +6,12 @@ use diesel::{
     ExpressionMethods as _, QueryDsl, SelectableHelper, result::QueryResult, sqlite::Sqlite,
 };
 use diesel_async::{AsyncConnection, RunQueryDsl};
-use miette::Diagnostic;
+
+use serde::Serialize;
 use thiserror::Error;
 
 use crate::{
-    db::models::{self, EvmBasicGrant, EvmWalletAccess},
-    evm::utils,
+    crypto::integrity::v1::Integrable, db::models::{self, EvmBasicGrant, EvmWalletAccess}, evm::utils
 };
 
 pub mod ether_transfer;
@@ -33,48 +33,41 @@ pub struct EvalContext {
     pub max_priority_fee_per_gas: u128,
 }
 
-#[derive(Debug, Error, Diagnostic)]
+#[derive(Debug, Error)]
 pub enum EvalViolation {
     #[error("This grant doesn't allow transactions to the target address {target}")]
-    #[diagnostic(code(arbiter_server::evm::eval_violation::invalid_target))]
     InvalidTarget { target: Address },
 
     #[error("Gas limit exceeded for this grant")]
-    #[diagnostic(code(arbiter_server::evm::eval_violation::gas_limit_exceeded))]
     GasLimitExceeded {
         max_gas_fee_per_gas: Option<U256>,
         max_priority_fee_per_gas: Option<U256>,
     },
 
     #[error("Rate limit exceeded for this grant")]
-    #[diagnostic(code(arbiter_server::evm::eval_violation::rate_limit_exceeded))]
     RateLimitExceeded,
 
     #[error("Transaction exceeds volumetric limits of the grant")]
-    #[diagnostic(code(arbiter_server::evm::eval_violation::volumetric_limit_exceeded))]
     VolumetricLimitExceeded,
 
     #[error("Transaction is outside of the grant's validity period")]
-    #[diagnostic(code(arbiter_server::evm::eval_violation::invalid_time))]
     InvalidTime,
 
     #[error("Transaction type is not allowed by this grant")]
-    #[diagnostic(code(arbiter_server::evm::eval_violation::invalid_transaction_type))]
     InvalidTransactionType,
 }
 
 pub type DatabaseID = i32;
 
-#[derive(Debug)]
+#[derive(Debug, Serialize)]
 pub struct Grant<PolicySettings> {
     pub id: DatabaseID,
-    pub shared_grant_id: DatabaseID, // ID of the basic grant for shared-logic checks like rate limits and validity periods
-    pub shared: SharedGrantSettings,
-    pub settings: PolicySettings,
+    pub common_settings_id: DatabaseID, // ID of the basic grant for shared-logic checks like rate limits and validity periods
+    pub settings: CombinedSettings<PolicySettings>,
 }
 
 pub trait Policy: Sized {
-    type Settings: Send + Sync + 'static + Into<SpecificGrant>;
+    type Settings: Send + Sync + 'static + Into<SpecificGrant> + Integrable;
     type Meaning: Display + std::fmt::Debug + Send + Sync + 'static + Into<SpecificMeaning>;
 
     fn analyze(context: &EvalContext) -> Option<Self::Meaning>;
@@ -130,19 +123,19 @@ pub enum SpecificMeaning {
     TokenTransfer(token_transfers::Meaning),
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize)]
 pub struct TransactionRateLimit {
     pub count: u32,
     pub window: Duration,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize)]
 pub struct VolumeRateLimit {
     pub max_volume: U256,
     pub window: Duration,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize)]
 pub struct SharedGrantSettings {
     pub wallet_access_id: i32,
     pub chain: ChainId,
@@ -157,7 +150,7 @@ pub struct SharedGrantSettings {
 }
 
 impl SharedGrantSettings {
-    fn try_from_model(model: EvmBasicGrant) -> QueryResult<Self> {
+    pub(crate) fn try_from_model(model: EvmBasicGrant) -> QueryResult<Self> {
         Ok(Self {
             wallet_access_id: model.wallet_access_id,
             chain: model.chain_id as u64, // safe because chain_id is stored as i32 but is guaranteed to be a valid ChainId by the API when creating grants
@@ -203,7 +196,23 @@ pub enum SpecificGrant {
     TokenTransfer(token_transfers::Settings),
 }
 
-pub struct FullGrant<PolicyGrant> {
-    pub basic: SharedGrantSettings,
+#[derive(Debug, Serialize)]
+pub struct CombinedSettings<PolicyGrant> {
+    pub shared: SharedGrantSettings,
     pub specific: PolicyGrant,
 }
+
+impl<P> CombinedSettings<P> {
+    pub fn generalize<Y: From<P>>(self) -> CombinedSettings<Y> {
+        CombinedSettings {
+            shared: self.shared,
+            specific: self.specific.into(),
+        }
+    }
+}
+
+impl<P: Integrable> Integrable for CombinedSettings<P> {
+    const KIND: &'static str = P::KIND;
+    const VERSION: i32 = P::VERSION;
+}
+

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

@@ -8,13 +8,14 @@ use diesel::sqlite::Sqlite;
 use diesel::{ExpressionMethods, JoinOnDsl, prelude::*};
 use diesel_async::{AsyncConnection, RunQueryDsl};
 
+use crate::crypto::integrity::v1::Integrable;
 use crate::db::models::{
     EvmBasicGrant, EvmEtherTransferGrant, EvmEtherTransferGrantTarget, EvmEtherTransferLimit,
     NewEvmEtherTransferLimit, SqliteTimestamp,
 };
 use crate::db::schema::{evm_basic_grant, evm_ether_transfer_limit, evm_transaction_log};
 use crate::evm::policies::{
-    Grant, SharedGrantSettings, SpecificGrant, SpecificMeaning, VolumeRateLimit,
+    CombinedSettings, Grant, SharedGrantSettings, SpecificGrant, SpecificMeaning, VolumeRateLimit,
 };
 use crate::{
     db::{
@@ -51,11 +52,14 @@ impl From<Meaning> for SpecificMeaning {
 }
 
 // A grant for ether transfers, which can be scoped to specific target addresses and volume limits
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, serde::Serialize)]
 pub struct Settings {
     pub target: Vec<Address>,
     pub limit: VolumeRateLimit,
 }
+impl Integrable for Settings {
+    const KIND: &'static str = "EtherTransfer";
+}
 
 impl From<Settings> for SpecificGrant {
     fn from(val: Settings) -> SpecificGrant {
@@ -95,17 +99,17 @@ async fn check_rate_limits(
     db: &mut impl AsyncConnection<Backend = Sqlite>,
 ) -> QueryResult<Vec<EvalViolation>> {
     let mut violations = Vec::new();
-    let window = grant.settings.limit.window;
+    let window = grant.settings.specific.limit.window;
 
     let past_transaction = query_relevant_past_transaction(grant.id, window, db).await?;
 
-    let window_start = chrono::Utc::now() - grant.settings.limit.window;
+    let window_start = chrono::Utc::now() - grant.settings.specific.limit.window;
     let prospective_cumulative_volume: U256 = past_transaction
         .iter()
         .filter(|(_, timestamp)| timestamp >= &window_start)
         .fold(current_transfer_value, |acc, (value, _)| acc + *value);
 
-    if prospective_cumulative_volume > grant.settings.limit.max_volume {
+    if prospective_cumulative_volume > grant.settings.specific.limit.max_volume {
         violations.push(EvalViolation::VolumetricLimitExceeded);
     }
 
@@ -138,7 +142,7 @@ impl Policy for EtherTransfer {
         let mut violations = Vec::new();
 
         // Check if the target address is within the grant's allowed targets
-        if !grant.settings.target.contains(&meaning.to) {
+        if !grant.settings.specific.target.contains(&meaning.to) {
             violations.push(EvalViolation::InvalidTarget { target: meaning.to });
         }
 
@@ -247,9 +251,11 @@ impl Policy for EtherTransfer {
 
         Ok(Some(Grant {
             id: grant.id,
-            shared_grant_id: grant.basic_grant_id,
-            shared: SharedGrantSettings::try_from_model(basic_grant)?,
-            settings,
+            common_settings_id: grant.basic_grant_id,
+            settings: CombinedSettings {
+                shared: SharedGrantSettings::try_from_model(basic_grant)?,
+                specific: settings,
+            },
         }))
     }
 
@@ -327,15 +333,17 @@ impl Policy for EtherTransfer {
 
                 Ok(Grant {
                     id: specific.id,
-                    shared_grant_id: specific.basic_grant_id,
-                    shared: SharedGrantSettings::try_from_model(basic)?,
-                    settings: Settings {
-                        target: targets,
-                        limit: VolumeRateLimit {
-                            max_volume: utils::try_bytes_to_u256(&limit.max_volume).map_err(
-                                |e| diesel::result::Error::DeserializationError(Box::new(e)),
-                            )?,
-                            window: Duration::seconds(limit.window_secs as i64),
+                    common_settings_id: specific.basic_grant_id,
+                    settings: CombinedSettings {
+                        shared: SharedGrantSettings::try_from_model(basic)?,
+                        specific: Settings {
+                            target: targets,
+                            limit: VolumeRateLimit {
+                                max_volume: utils::try_bytes_to_u256(&limit.max_volume).map_err(
+                                    |e| diesel::result::Error::DeserializationError(Box::new(e)),
+                                )?,
+                                window: Duration::seconds(limit.window_secs as i64),
+                            },
                         },
                     },
                 })

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

@@ -11,7 +11,10 @@ use crate::db::{
     schema::{evm_basic_grant, evm_transaction_log},
 };
 use crate::evm::{
-    policies::{EvalContext, EvalViolation, Grant, Policy, SharedGrantSettings, VolumeRateLimit},
+    policies::{
+        CombinedSettings, EvalContext, EvalViolation, Grant, Policy, SharedGrantSettings,
+        VolumeRateLimit,
+    },
     utils,
 };
 
@@ -108,9 +111,11 @@ async fn evaluate_passes_for_allowed_target() {
 
     let grant = Grant {
         id: 999,
-        shared_grant_id: 999,
-        shared: shared(),
-        settings: make_settings(vec![ALLOWED], 1_000_000),
+        common_settings_id: 999,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: make_settings(vec![ALLOWED], 1_000_000),
+        },
     };
     let context = ctx(ALLOWED, U256::from(100u64));
     let m = EtherTransfer::analyze(&context).unwrap();
@@ -127,9 +132,11 @@ async fn evaluate_rejects_disallowed_target() {
 
     let grant = Grant {
         id: 999,
-        shared_grant_id: 999,
-        shared: shared(),
-        settings: make_settings(vec![ALLOWED], 1_000_000),
+        common_settings_id: 999,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: make_settings(vec![ALLOWED], 1_000_000),
+        },
     };
     let context = ctx(OTHER, U256::from(100u64));
     let m = EtherTransfer::analyze(&context).unwrap();
@@ -167,9 +174,11 @@ async fn evaluate_passes_when_volume_within_limit() {
 
     let grant = Grant {
         id: grant_id,
-        shared_grant_id: basic.id,
-        shared: shared(),
-        settings,
+        common_settings_id: basic.id,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: settings,
+        },
     };
     let context = ctx(ALLOWED, U256::from(100u64));
     let m = EtherTransfer::analyze(&context).unwrap();
@@ -207,9 +216,11 @@ async fn evaluate_rejects_volume_over_limit() {
 
     let grant = Grant {
         id: grant_id,
-        shared_grant_id: basic.id,
-        shared: shared(),
-        settings,
+        common_settings_id: basic.id,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: settings,
+        },
     };
     let context = ctx(ALLOWED, U256::from(1u64));
     let m = EtherTransfer::analyze(&context).unwrap();
@@ -248,9 +259,11 @@ async fn evaluate_passes_at_exactly_volume_limit() {
 
     let grant = Grant {
         id: grant_id,
-        shared_grant_id: basic.id,
-        shared: shared(),
-        settings,
+        common_settings_id: basic.id,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: settings,
+        },
     };
     let context = ctx(ALLOWED, U256::from(100u64));
     let m = EtherTransfer::analyze(&context).unwrap();
@@ -282,8 +295,11 @@ async fn try_find_grant_roundtrip() {
 
     assert!(found.is_some());
     let g = found.unwrap();
-    assert_eq!(g.settings.target, vec![ALLOWED]);
-    assert_eq!(g.settings.limit.max_volume, U256::from(1_000_000u64));
+    assert_eq!(g.settings.specific.target, vec![ALLOWED]);
+    assert_eq!(
+        g.settings.specific.limit.max_volume,
+        U256::from(1_000_000u64)
+    );
 }
 
 #[tokio::test]
@@ -347,7 +363,7 @@ async fn find_all_grants_excludes_revoked() {
 
     let all = EtherTransfer::find_all_grants(&mut *conn).await.unwrap();
     assert_eq!(all.len(), 1);
-    assert_eq!(all[0].settings.target, vec![ALLOWED]);
+    assert_eq!(all[0].settings.specific.target, vec![ALLOWED]);
 }
 
 #[tokio::test]
@@ -363,8 +379,11 @@ async fn find_all_grants_multiple_targets() {
 
     let all = EtherTransfer::find_all_grants(&mut *conn).await.unwrap();
     assert_eq!(all.len(), 1);
-    assert_eq!(all[0].settings.target.len(), 2);
-    assert_eq!(all[0].settings.limit.max_volume, U256::from(1_000_000u64));
+    assert_eq!(all[0].settings.specific.target.len(), 2);
+    assert_eq!(
+        all[0].settings.specific.limit.max_volume,
+        U256::from(1_000_000u64)
+    );
 }
 
 #[tokio::test]

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

@@ -10,11 +10,8 @@ use diesel::dsl::{auto_type, insert_into};
 use diesel::sqlite::Sqlite;
 use diesel::{ExpressionMethods, prelude::*};
 use diesel_async::{AsyncConnection, RunQueryDsl};
+use serde::Serialize;
 
-use crate::db::models::{
-    EvmBasicGrant, EvmTokenTransferGrant, EvmTokenTransferVolumeLimit, NewEvmTokenTransferGrant,
-    NewEvmTokenTransferLog, NewEvmTokenTransferVolumeLimit, SqliteTimestamp,
-};
 use crate::db::schema::{
     evm_basic_grant, evm_token_transfer_grant, evm_token_transfer_log,
     evm_token_transfer_volume_limit,
@@ -26,6 +23,15 @@ use crate::evm::{
     },
     utils,
 };
+use crate::{
+    crypto::integrity::Integrable,
+    db::models::{
+        EvmBasicGrant, EvmTokenTransferGrant, EvmTokenTransferVolumeLimit,
+        NewEvmTokenTransferGrant, NewEvmTokenTransferLog, NewEvmTokenTransferVolumeLimit,
+        SqliteTimestamp,
+    },
+    evm::policies::CombinedSettings,
+};
 
 use super::{DatabaseID, EvalContext, EvalViolation};
 
@@ -38,9 +44,9 @@ fn grant_join() -> _ {
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct Meaning {
-    pub(crate) token: &'static TokenInfo,
-    pub(crate) to: Address,
-    pub(crate) value: U256,
+    pub token: &'static TokenInfo,
+    pub to: Address,
+    pub value: U256,
 }
 impl std::fmt::Display for Meaning {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
@@ -58,12 +64,15 @@ impl From<Meaning> for SpecificMeaning {
 }
 
 // A grant for token transfers, which can be scoped to specific target addresses and volume limits
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Serialize)]
 pub struct Settings {
     pub token_contract: Address,
     pub target: Option<Address>,
     pub volume_limits: Vec<VolumeRateLimit>,
 }
+impl Integrable for Settings {
+    const KIND: &'static str = "TokenTransfer";
+}
 impl From<Settings> for SpecificGrant {
     fn from(val: Settings) -> SpecificGrant {
         SpecificGrant::TokenTransfer(val)
@@ -106,13 +115,20 @@ async fn check_volume_rate_limits(
 ) -> QueryResult<Vec<EvalViolation>> {
     let mut violations = Vec::new();
 
-    let Some(longest_window) = grant.settings.volume_limits.iter().map(|l| l.window).max() else {
+    let Some(longest_window) = grant
+        .settings
+        .specific
+        .volume_limits
+        .iter()
+        .map(|l| l.window)
+        .max()
+    else {
         return Ok(violations);
     };
 
     let past_transfers = query_relevant_past_transfers(grant.id, longest_window, db).await?;
 
-    for limit in &grant.settings.volume_limits {
+    for limit in &grant.settings.specific.volume_limits {
         let window_start = chrono::Utc::now() - limit.window;
         let prospective_cumulative_volume: U256 = past_transfers
             .iter()
@@ -158,7 +174,7 @@ impl Policy for TokenTransfer {
             return Ok(violations);
         }
 
-        if let Some(allowed) = grant.settings.target
+        if let Some(allowed) = grant.settings.specific.target
             && allowed != meaning.to
         {
             violations.push(EvalViolation::InvalidTarget { target: meaning.to });
@@ -269,9 +285,11 @@ impl Policy for TokenTransfer {
 
         Ok(Some(Grant {
             id: token_grant.id,
-            shared_grant_id: token_grant.basic_grant_id,
-            shared: SharedGrantSettings::try_from_model(basic_grant)?,
-            settings,
+            common_settings_id: token_grant.basic_grant_id,
+            settings: CombinedSettings {
+                shared: SharedGrantSettings::try_from_model(basic_grant)?,
+                specific: settings,
+            },
         }))
     }
 
@@ -369,12 +387,14 @@ impl Policy for TokenTransfer {
 
                 Ok(Grant {
                     id: specific.id,
-                    shared_grant_id: specific.basic_grant_id,
-                    shared: SharedGrantSettings::try_from_model(basic)?,
-                    settings: Settings {
-                        token_contract: Address::from(token_contract),
-                        target,
-                        volume_limits,
+                    common_settings_id: specific.basic_grant_id,
+                    settings: CombinedSettings {
+                        shared: SharedGrantSettings::try_from_model(basic)?,
+                        specific: Settings {
+                            token_contract: Address::from(token_contract),
+                            target,
+                            volume_limits,
+                        },
                     },
                 })
             })

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

@@ -11,7 +11,10 @@ use crate::db::{
 };
 use crate::evm::{
     abi::IERC20::transferCall,
-    policies::{EvalContext, EvalViolation, Grant, Policy, SharedGrantSettings, VolumeRateLimit},
+    policies::{
+        CombinedSettings, EvalContext, EvalViolation, Grant, Policy, SharedGrantSettings,
+        VolumeRateLimit,
+    },
     utils,
 };
 
@@ -134,9 +137,11 @@ async fn evaluate_rejects_nonzero_eth_value() {
 
     let grant = Grant {
         id: 999,
-        shared_grant_id: 999,
-        shared: shared(),
-        settings: make_settings(None, None),
+        common_settings_id: 999,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: make_settings(None, None),
+        },
     };
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let mut context = ctx(DAI, calldata);
@@ -163,9 +168,11 @@ async fn evaluate_passes_any_recipient_when_no_restriction() {
 
     let grant = Grant {
         id: 999,
-        shared_grant_id: 999,
-        shared: shared(),
-        settings: make_settings(None, None),
+        common_settings_id: 999,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: make_settings(None, None),
+        },
     };
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let context = ctx(DAI, calldata);
@@ -183,9 +190,11 @@ async fn evaluate_passes_matching_restricted_recipient() {
 
     let grant = Grant {
         id: 999,
-        shared_grant_id: 999,
-        shared: shared(),
-        settings: make_settings(Some(RECIPIENT), None),
+        common_settings_id: 999,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: make_settings(Some(RECIPIENT), None),
+        },
     };
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let context = ctx(DAI, calldata);
@@ -203,9 +212,11 @@ async fn evaluate_rejects_wrong_restricted_recipient() {
 
     let grant = Grant {
         id: 999,
-        shared_grant_id: 999,
-        shared: shared(),
-        settings: make_settings(Some(RECIPIENT), None),
+        common_settings_id: 999,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: make_settings(Some(RECIPIENT), None),
+        },
     };
     let calldata = transfer_calldata(OTHER, U256::from(100u64));
     let context = ctx(DAI, calldata);
@@ -247,9 +258,11 @@ async fn evaluate_passes_volume_at_exact_limit() {
 
     let grant = Grant {
         id: grant_id,
-        shared_grant_id: basic.id,
-        shared: shared(),
-        settings,
+        common_settings_id: basic.id,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: settings,
+        },
     };
     let calldata = transfer_calldata(RECIPIENT, U256::from(100u64));
     let context = ctx(DAI, calldata);
@@ -290,9 +303,11 @@ async fn evaluate_rejects_volume_over_limit() {
 
     let grant = Grant {
         id: grant_id,
-        shared_grant_id: basic.id,
-        shared: shared(),
-        settings,
+        common_settings_id: basic.id,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: settings,
+        },
     };
     let calldata = transfer_calldata(RECIPIENT, U256::from(1u64));
     let context = ctx(DAI, calldata);
@@ -313,9 +328,11 @@ async fn evaluate_no_volume_limits_always_passes() {
 
     let grant = Grant {
         id: 999,
-        shared_grant_id: 999,
-        shared: shared(),
-        settings: make_settings(None, None), // no volume limits
+        common_settings_id: 999,
+        settings: CombinedSettings {
+            shared: shared(),
+            specific: make_settings(None, None), // no volume limits
+        },
     };
     let calldata = transfer_calldata(RECIPIENT, U256::from(u64::MAX));
     let context = ctx(DAI, calldata);
@@ -349,10 +366,13 @@ async fn try_find_grant_roundtrip() {
 
     assert!(found.is_some());
     let g = found.unwrap();
-    assert_eq!(g.settings.token_contract, DAI);
-    assert_eq!(g.settings.target, Some(RECIPIENT));
-    assert_eq!(g.settings.volume_limits.len(), 1);
-    assert_eq!(g.settings.volume_limits[0].max_volume, U256::from(5_000u64));
+    assert_eq!(g.settings.specific.token_contract, DAI);
+    assert_eq!(g.settings.specific.target, Some(RECIPIENT));
+    assert_eq!(g.settings.specific.volume_limits.len(), 1);
+    assert_eq!(
+        g.settings.specific.volume_limits[0].max_volume,
+        U256::from(5_000u64)
+    );
 }
 
 #[tokio::test]
@@ -434,9 +454,9 @@ async fn find_all_grants_loads_volume_limits() {
 
     let all = TokenTransfer::find_all_grants(&mut *conn).await.unwrap();
     assert_eq!(all.len(), 1);
-    assert_eq!(all[0].settings.volume_limits.len(), 1);
+    assert_eq!(all[0].settings.specific.volume_limits.len(), 1);
     assert_eq!(
-        all[0].settings.volume_limits[0].max_volume,
+        all[0].settings.specific.volume_limits[0].max_volume,
         U256::from(9_999u64)
     );
 }

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

@@ -140,7 +140,9 @@ impl Receiver<auth::Inbound> for AuthTransportAdapter<'_> {
         let Some(payload) = auth_request.payload else {
             let _ = self
                 .bi
-                .send(Err(Status::invalid_argument("Missing client auth request payload")))
+                .send(Err(Status::invalid_argument(
+                    "Missing client auth request payload",
+                )))
                 .await;
             return None;
         };
@@ -170,9 +172,7 @@ impl Receiver<auth::Inbound> for AuthTransportAdapter<'_> {
                     metadata: client_metadata_from_proto(client_info),
                 })
             }
-            AuthRequestPayload::ChallengeSolution(ProtoAuthChallengeSolution {
-                signature,
-            }) => {
+            AuthRequestPayload::ChallengeSolution(ProtoAuthChallengeSolution { signature }) => {
                 let Ok(signature) = ed25519_dalek::Signature::try_from(signature.as_slice()) else {
                     let _ = self
                         .send_auth_result(ProtoAuthResult::InvalidSignature)

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

@@ -34,7 +34,9 @@ pub(super) async fn dispatch(
     req: proto_evm::Request,
 ) -> Result<ClientResponsePayload, Status> {
     let Some(payload) = req.payload else {
-        return Err(Status::invalid_argument("Missing client EVM request payload"));
+        return Err(Status::invalid_argument(
+            "Missing client EVM request payload",
+        ));
     };
 
     match payload {
@@ -59,13 +61,13 @@ pub(super) async fn dispatch(
                 ))) => EvmSignTransactionResponse {
                     result: Some(vet_error.convert()),
                 },
-                Err(kameo::error::SendError::HandlerError(
-                    SignTransactionRpcError::Internal,
-                )) => EvmSignTransactionResponse {
-                    result: Some(EvmSignTransactionResult::Error(
-                        ProtoEvmError::Internal.into(),
-                    )),
-                },
+                Err(kameo::error::SendError::HandlerError(SignTransactionRpcError::Internal)) => {
+                    EvmSignTransactionResponse {
+                        result: Some(EvmSignTransactionResult::Error(
+                            ProtoEvmError::Internal.into(),
+                        )),
+                    }
+                }
                 Err(err) => {
                     warn!(error = ?err, "Failed to sign EVM transaction");
                     EvmSignTransactionResponse {
@@ -78,8 +80,8 @@ pub(super) async fn dispatch(
 
             Ok(wrap_response(EvmResponsePayload::SignTransaction(response)))
         }
-        EvmRequestPayload::AnalyzeTransaction(_) => {
-            Err(Status::unimplemented("EVM transaction analysis is not yet implemented"))
-        }
+        EvmRequestPayload::AnalyzeTransaction(_) => Err(Status::unimplemented(
+            "EVM transaction analysis is not yet implemented",
+        )),
     }
 }

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

@@ -0,0 +1 @@
+

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

@@ -0,0 +1 @@
+

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

@@ -12,11 +12,9 @@ use kameo::{actor::ActorRef, error::SendError};
 use tonic::Status;
 use tracing::warn;
 
-use crate::{
-    actors::{
-        client::session::{ClientSession, Error, HandleQueryVaultState},
-        keyholder::KeyHolderState,
-    },
+use crate::actors::{
+    client::session::{ClientSession, Error, HandleQueryVaultState},
+    keyholder::KeyHolderState,
 };
 
 pub(super) async fn dispatch(
@@ -24,7 +22,9 @@ pub(super) async fn dispatch(
     req: proto_vault::Request,
 ) -> Result<ClientResponsePayload, Status> {
     let Some(payload) = req.payload else {
-        return Err(Status::invalid_argument("Missing client vault request payload"));
+        return Err(Status::invalid_argument(
+            "Missing client vault request payload",
+        ));
     };
 
     match payload {

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

@@ -28,9 +28,8 @@ impl TryConvert for RawEvmTransaction {
     type Error = tonic::Status;
 
     fn try_convert(self) -> Result<Self::Output, Self::Error> {
-        let tx = TxEip1559::decode(&mut self.0.as_slice()).map_err(|_| {
-            tonic::Status::invalid_argument("Invalid EVM transaction format")
-        })?;
+        let tx = TxEip1559::decode(&mut self.0.as_slice())
+            .map_err(|_| tonic::Status::invalid_argument("Invalid EVM transaction format"))?;
         Ok(tx)
     }
-}
+}

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

@@ -1,9 +1,12 @@
 use alloy::primitives::U256;
 use arbiter_proto::proto::{
-    evm::{EvmError as ProtoEvmError, evm_sign_transaction_response::Result as EvmSignTransactionResult},
+    evm::{
+        EvmError as ProtoEvmError,
+        evm_sign_transaction_response::Result as EvmSignTransactionResult,
+    },
     shared::evm::{
-        EvalViolation as ProtoEvalViolation, GasLimitExceededViolation,
-        NoMatchingGrantError, PolicyViolationsError, SpecificMeaning as ProtoSpecificMeaning,
+        EvalViolation as ProtoEvalViolation, GasLimitExceededViolation, NoMatchingGrantError,
+        PolicyViolationsError, SpecificMeaning as ProtoSpecificMeaning,
         TokenInfo as ProtoTokenInfo, TransactionEvalError as ProtoTransactionEvalError,
         eval_violation::Kind as ProtoEvalViolationKind,
         specific_meaning::Meaning as ProtoSpecificMeaningKind,
@@ -105,12 +108,12 @@ impl Convert for VetError {
                         violations: violations.into_iter().map(Convert::convert).collect(),
                     })
                 }
-                PolicyError::Database(_) => {
+                PolicyError::Database(_)| PolicyError::Integrity(_) => {
                     return EvmSignTransactionResult::Error(ProtoEvmError::Internal.into());
                 }
             },
         };
 
-        EvmSignTransactionResult::EvalError(ProtoTransactionEvalError { kind: Some(kind) }.into())
+        EvmSignTransactionResult::EvalError(ProtoTransactionEvalError { kind: Some(kind) })
     }
 }

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

@@ -1,12 +1,10 @@
 use tokio::sync::mpsc;
 
 use arbiter_proto::{
-    proto::{
-        user_agent::{
-            UserAgentRequest, UserAgentResponse,
-            user_agent_request::Payload as UserAgentRequestPayload,
-            user_agent_response::Payload as UserAgentResponsePayload,
-        },
+    proto::user_agent::{
+        UserAgentRequest, UserAgentResponse,
+        user_agent_request::Payload as UserAgentRequestPayload,
+        user_agent_response::Payload as UserAgentResponsePayload,
     },
     transport::{Error as TransportError, Receiver, Sender, grpc::GrpcBi},
 };
@@ -19,6 +17,7 @@ use crate::{
     actors::user_agent::{OutOfBand, UserAgentConnection, UserAgentSession},
     grpc::request_tracker::RequestTracker,
 };
+
 mod auth;
 mod evm;
 mod inbound;

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

@@ -1,12 +1,14 @@
 use arbiter_proto::{
     proto::user_agent::{
-        UserAgentRequest, UserAgentResponse, auth::{
+        UserAgentRequest, UserAgentResponse,
+        auth::{
             self as proto_auth, AuthChallenge as ProtoAuthChallenge,
             AuthChallengeRequest as ProtoAuthChallengeRequest,
             AuthChallengeSolution as ProtoAuthChallengeSolution, AuthResult as ProtoAuthResult,
             KeyType as ProtoKeyType, request::Payload as AuthRequestPayload,
             response::Payload as AuthResponsePayload,
-        }, user_agent_request::Payload as UserAgentRequestPayload,
+        },
+        user_agent_request::Payload as UserAgentRequestPayload,
         user_agent_response::Payload as UserAgentResponsePayload,
     },
     transport::{Bi, Error as TransportError, Receiver, Sender, grpc::GrpcBi},
@@ -63,7 +65,9 @@ impl Sender<Result<auth::Outbound, auth::Error>> for AuthTransportAdapter<'_> {
             Ok(Outbound::AuthChallenge { nonce }) => {
                 AuthResponsePayload::Challenge(ProtoAuthChallenge { nonce })
             }
-            Ok(Outbound::AuthSuccess) => AuthResponsePayload::Result(ProtoAuthResult::Success.into()),
+            Ok(Outbound::AuthSuccess) => {
+                AuthResponsePayload::Result(ProtoAuthResult::Success.into())
+            }
             Err(Error::UnregisteredPublicKey) => {
                 AuthResponsePayload::Result(ProtoAuthResult::InvalidKey.into())
             }
@@ -171,9 +175,9 @@ impl Receiver<auth::Inbound> for AuthTransportAdapter<'_> {
                     bootstrap_token,
                 })
             }
-            AuthRequestPayload::ChallengeSolution(ProtoAuthChallengeSolution {
-                signature,
-            }) => Some(auth::Inbound::AuthChallengeSolution { signature }),
+            AuthRequestPayload::ChallengeSolution(ProtoAuthChallengeSolution { signature }) => {
+                Some(auth::Inbound::AuthChallengeSolution { signature })
+            }
         }
     }
 }

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

@@ -3,8 +3,7 @@ use arbiter_proto::proto::{
         EvmError as ProtoEvmError, EvmGrantCreateRequest, EvmGrantCreateResponse,
         EvmGrantDeleteRequest, EvmGrantDeleteResponse, EvmGrantList, EvmGrantListResponse,
         EvmSignTransactionResponse, GrantEntry, WalletCreateResponse, WalletEntry, WalletList,
-        WalletListResponse,
-        evm_grant_create_response::Result as EvmGrantCreateResult,
+        WalletListResponse, evm_grant_create_response::Result as EvmGrantCreateResult,
         evm_grant_delete_response::Result as EvmGrantDeleteResult,
         evm_grant_list_response::Result as EvmGrantListResult,
         evm_sign_transaction_response::Result as EvmSignTransactionResult,
@@ -27,8 +26,8 @@ use crate::{
     actors::user_agent::{
         UserAgentSession,
         session::connection::{
-            HandleEvmWalletCreate, HandleEvmWalletList, HandleGrantCreate, HandleGrantDelete,
-            HandleGrantList, HandleSignTransaction,
+            GrantMutationError, HandleEvmWalletCreate, HandleEvmWalletList, HandleGrantCreate,
+            HandleGrantDelete, HandleGrantList, HandleSignTransaction,
             SignTransactionError as SessionSignTransactionError,
         },
     },
@@ -115,10 +114,10 @@ async fn handle_grant_list(
             grants: grants
                 .into_iter()
                 .map(|grant| GrantEntry {
-                    id: grant.id,
-                    wallet_access_id: grant.shared.wallet_access_id,
-                    shared: Some(grant.shared.convert()),
-                    specific: Some(grant.settings.convert()),
+                    id: grant.common_settings_id,
+                    wallet_access_id: grant.settings.shared.wallet_access_id,
+                    shared: Some(grant.settings.shared.convert()),
+                    specific: Some(grant.settings.specific.convert()),
                 })
                 .collect(),
         }),
@@ -149,6 +148,9 @@ async fn handle_grant_create(
 
     let result = match actor.ask(HandleGrantCreate { basic, grant }).await {
         Ok(grant_id) => EvmGrantCreateResult::GrantId(grant_id),
+        Err(kameo::error::SendError::HandlerError(GrantMutationError::VaultSealed)) => {
+            EvmGrantCreateResult::Error(ProtoEvmError::VaultSealed.into())
+        }
         Err(err) => {
             warn!(error = ?err, "Failed to create EVM grant");
             EvmGrantCreateResult::Error(ProtoEvmError::Internal.into())
@@ -165,8 +167,16 @@ async fn handle_grant_delete(
     actor: &ActorRef<UserAgentSession>,
     req: EvmGrantDeleteRequest,
 ) -> Result<Option<UserAgentResponsePayload>, Status> {
-    let result = match actor.ask(HandleGrantDelete { grant_id: req.grant_id }).await {
+    let result = match actor
+        .ask(HandleGrantDelete {
+            grant_id: req.grant_id,
+        })
+        .await
+    {
         Ok(()) => EvmGrantDeleteResult::Ok(()),
+        Err(kameo::error::SendError::HandlerError(GrantMutationError::VaultSealed)) => {
+            EvmGrantDeleteResult::Error(ProtoEvmError::VaultSealed.into())
+        }
         Err(err) => {
             warn!(error = ?err, "Failed to delete EVM grant");
             EvmGrantDeleteResult::Error(ProtoEvmError::Internal.into())
@@ -202,18 +212,18 @@ async fn handle_sign_transaction(
                 signature.as_bytes().to_vec(),
             )),
         },
-        Err(kameo::error::SendError::HandlerError(
-            SessionSignTransactionError::Vet(vet_error),
-        )) => EvmSignTransactionResponse {
-            result: Some(vet_error.convert()),
-        },
-        Err(kameo::error::SendError::HandlerError(
-            SessionSignTransactionError::Internal,
-        )) => EvmSignTransactionResponse {
-            result: Some(EvmSignTransactionResult::Error(
-                ProtoEvmError::Internal.into(),
-            )),
-        },
+        Err(kameo::error::SendError::HandlerError(SessionSignTransactionError::Vet(vet_error))) => {
+            EvmSignTransactionResponse {
+                result: Some(vet_error.convert()),
+            }
+        }
+        Err(kameo::error::SendError::HandlerError(SessionSignTransactionError::Internal)) => {
+            EvmSignTransactionResponse {
+                result: Some(EvmSignTransactionResult::Error(
+                    ProtoEvmError::Internal.into(),
+                )),
+            }
+        }
         Err(err) => {
             warn!(error = ?err, "Failed to sign EVM transaction");
             EvmSignTransactionResponse {
@@ -224,7 +234,7 @@ async fn handle_sign_transaction(
         }
     };
 
-    Ok(Some(wrap_evm_response(EvmResponsePayload::SignTransaction(
-        response,
-    ))))
+    Ok(Some(wrap_evm_response(
+        EvmResponsePayload::SignTransaction(response),
+    )))
 }

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

@@ -5,9 +5,7 @@ use arbiter_proto::proto::{
         TransactionRateLimit as ProtoTransactionRateLimit, VolumeRateLimit as ProtoVolumeRateLimit,
         specific_grant::Grant as ProtoSpecificGrantType,
     },
-    user_agent::sdk_client::{
-        WalletAccess, WalletAccessEntry as ProtoSdkClientWalletAccess,
-    },
+    user_agent::sdk_client::{WalletAccess, WalletAccessEntry as ProtoSdkClientWalletAccess},
 };
 use chrono::{DateTime, Utc};
 use prost_types::Timestamp as ProtoTimestamp;

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

@@ -1,4 +1,5 @@
 use arbiter_proto::proto::{
+    shared::ClientInfo as ProtoClientMetadata,
     user_agent::{
         sdk_client::{
             self as proto_sdk_client, ConnectionCancel as ProtoSdkClientConnectionCancel,
@@ -13,7 +14,6 @@ use arbiter_proto::proto::{
         },
         user_agent_response::Payload as UserAgentResponsePayload,
     },
-    shared::ClientInfo as ProtoClientMetadata,
 };
 use kameo::actor::ActorRef;
 use tonic::Status;
@@ -62,18 +62,22 @@ pub(super) async fn dispatch(
     req: proto_sdk_client::Request,
 ) -> Result<Option<UserAgentResponsePayload>, Status> {
     let Some(payload) = req.payload else {
-        return Err(Status::invalid_argument("Missing SDK client request payload"));
+        return Err(Status::invalid_argument(
+            "Missing SDK client request payload",
+        ));
     };
 
     match payload {
         SdkClientRequestPayload::ConnectionResponse(resp) => {
             handle_connection_response(actor, resp).await
         }
-        SdkClientRequestPayload::Revoke(_) => {
-            Err(Status::unimplemented("SdkClientRevoke is not yet implemented"))
-        }
+        SdkClientRequestPayload::Revoke(_) => Err(Status::unimplemented(
+            "SdkClientRevoke is not yet implemented",
+        )),
         SdkClientRequestPayload::List(_) => handle_list(actor).await,
-        SdkClientRequestPayload::GrantWalletAccess(req) => handle_grant_wallet_access(actor, req).await,
+        SdkClientRequestPayload::GrantWalletAccess(req) => {
+            handle_grant_wallet_access(actor, req).await
+        }
         SdkClientRequestPayload::RevokeWalletAccess(req) => {
             handle_revoke_wallet_access(actor, req).await
         }
@@ -128,11 +132,11 @@ async fn handle_list(
             ProtoSdkClientListResult::Error(ProtoSdkClientError::Internal.into())
         }
     };
-    Ok(Some(wrap_sdk_client_response(SdkClientResponsePayload::List(
-        ProtoSdkClientListResponse {
+    Ok(Some(wrap_sdk_client_response(
+        SdkClientResponsePayload::List(ProtoSdkClientListResponse {
             result: Some(result),
-        },
-    ))))
+        }),
+    )))
 }
 
 async fn handle_grant_wallet_access(

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

@@ -1,3 +1,4 @@
+use arbiter_proto::proto::shared::VaultState as ProtoVaultState;
 use arbiter_proto::proto::user_agent::{
     user_agent_response::Payload as UserAgentResponsePayload,
     vault::{
@@ -11,25 +12,21 @@ use arbiter_proto::proto::user_agent::{
         unseal::{
             self as proto_unseal, UnsealEncryptedKey as ProtoUnsealEncryptedKey,
             UnsealResult as ProtoUnsealResult, UnsealStart,
-            request::Payload as UnsealRequestPayload,
-            response::Payload as UnsealResponsePayload,
+            request::Payload as UnsealRequestPayload, response::Payload as UnsealResponsePayload,
         },
     },
 };
-use arbiter_proto::proto::shared::VaultState as ProtoVaultState;
 use kameo::{actor::ActorRef, error::SendError};
 use tonic::Status;
 use tracing::warn;
 
-use crate::{
-    actors::{
-        keyholder::KeyHolderState,
-        user_agent::{
-            UserAgentSession,
-            session::connection::{
-                BootstrapError, HandleBootstrapEncryptedKey, HandleQueryVaultState,
-                HandleUnsealEncryptedKey, HandleUnsealRequest, UnsealError,
-            },
+use crate::actors::{
+    keyholder::KeyHolderState,
+    user_agent::{
+        UserAgentSession,
+        session::connection::{
+            BootstrapError, HandleBootstrapEncryptedKey, HandleQueryVaultState,
+            HandleUnsealEncryptedKey, HandleUnsealRequest, UnsealError,
         },
     },
 };
@@ -151,7 +148,9 @@ async fn handle_bootstrap_encrypted_key(
         .await
     {
         Ok(()) => ProtoBootstrapResult::Success,
-        Err(SendError::HandlerError(BootstrapError::InvalidKey)) => ProtoBootstrapResult::InvalidKey,
+        Err(SendError::HandlerError(BootstrapError::InvalidKey)) => {
+            ProtoBootstrapResult::InvalidKey
+        }
         Err(SendError::HandlerError(BootstrapError::AlreadyBootstrapped)) => {
             ProtoBootstrapResult::AlreadyBootstrapped
         }

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

@@ -3,6 +3,7 @@ use crate::context::ServerContext;
 
 pub mod actors;
 pub mod context;
+pub mod crypto;
 pub mod db;
 pub mod evm;
 pub mod grpc;

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

@@ -1,8 +1,8 @@
 use std::net::SocketAddr;
 
+use anyhow::anyhow;
 use arbiter_proto::{proto::arbiter_service_server::ArbiterServiceServer, url::ArbiterUrl};
 use arbiter_server::{Server, actors::bootstrap::GetToken, context::ServerContext, db};
-use miette::miette;
 use rustls::crypto::aws_lc_rs;
 use tonic::transport::{Identity, ServerTlsConfig};
 use tracing::info;
@@ -10,7 +10,7 @@ use tracing::info;
 const PORT: u16 = 50051;
 
 #[tokio::main]
-async fn main() -> miette::Result<()> {
+async fn main() -> anyhow::Result<()> {
     aws_lc_rs::default_provider().install_default().unwrap();
 
     tracing_subscriber::fmt()
@@ -46,11 +46,11 @@ async fn main() -> miette::Result<()> {
 
     tonic::transport::Server::builder()
         .tls_config(tls)
-        .map_err(|err| miette!("Faild to setup TLS: {err}"))?
+        .map_err(|err| anyhow!("Failed to setup TLS: {err}"))?
         .add_service(ArbiterServiceServer::new(Server::new(context)))
         .serve(addr)
         .await
-        .map_err(|e| miette::miette!("gRPC server error: {e}"))?;
+        .map_err(|e| anyhow!("gRPC server error: {e}"))?;
 
     unreachable!("gRPC server should run indefinitely");
 }

server/crates/arbiter-server/tests/keyholder/lifecycle.rs

@@ -1,5 +1,6 @@
 use arbiter_server::{
     actors::keyholder::{Error, KeyHolder},
+    crypto::encryption::v1::{Nonce, ROOT_KEY_TAG},
     db::{self, models, schema},
     safe_cell::{SafeCell, SafeCellHandle as _},
 };
@@ -25,16 +26,10 @@ async fn test_bootstrap() {
         .unwrap();
 
     assert_eq!(row.schema_version, 1);
-    assert_eq!(
-        row.tag,
-        arbiter_server::actors::keyholder::encryption::v1::ROOT_KEY_TAG
-    );
+    assert_eq!(row.tag, ROOT_KEY_TAG);
     assert!(!row.ciphertext.is_empty());
     assert!(!row.salt.is_empty());
-    assert_eq!(
-        row.data_encryption_nonce,
-        arbiter_server::actors::keyholder::encryption::v1::Nonce::default().to_vec()
-    );
+    assert_eq!(row.data_encryption_nonce, Nonce::default().to_vec());
 }
 
 #[tokio::test]

server/crates/arbiter-server/tests/keyholder/storage.rs

@@ -1,7 +1,8 @@
 use std::collections::HashSet;
 
 use arbiter_server::{
-    actors::keyholder::{Error, encryption::v1},
+    actors::keyholder::Error,
+    crypto::encryption::v1::Nonce,
     db::{self, models, schema},
     safe_cell::{SafeCell, SafeCellHandle as _},
 };
@@ -102,7 +103,7 @@ async fn test_nonce_never_reused() {
     assert_eq!(nonces.len(), unique.len(), "all nonces must be unique");
 
     for (i, row) in rows.iter().enumerate() {
-        let mut expected = v1::Nonce::default();
+        let mut expected = Nonce::default();
         for _ in 0..=i {
             expected.increment();
         }

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

@@ -3,9 +3,12 @@ use arbiter_server::{
     actors::{
         GlobalActors,
         bootstrap::GetToken,
-        user_agent::{AuthPublicKey, UserAgentConnection, auth},
+        keyholder::Bootstrap,
+        user_agent::{AuthPublicKey, UserAgentConnection, UserAgentCredentials, auth},
     },
+    crypto::integrity,
     db::{self, schema},
+    safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use diesel::{ExpressionMethods as _, QueryDsl, insert_into};
 use diesel_async::RunQueryDsl;
@@ -18,6 +21,13 @@ use super::common::ChannelTransport;
 pub async fn test_bootstrap_token_auth() {
     let db = db::create_test_pool().await;
     let actors = GlobalActors::spawn(db.clone()).await.unwrap();
+    actors
+        .key_holder
+        .ask(Bootstrap {
+            seal_key_raw: SafeCell::new(b"test-seal-key".to_vec()),
+        })
+        .await
+        .unwrap();
     let token = actors.bootstrapper.ask(GetToken).await.unwrap().unwrap();
 
     let (server_transport, mut test_transport) = ChannelTransport::new();
@@ -83,7 +93,6 @@ pub async fn test_bootstrap_invalid_token_auth() {
         Err(auth::Error::InvalidBootstrapToken)
     ));
 
-    // Verify no key was registered
     let mut conn = db.get().await.unwrap();
     let count: i64 = schema::useragent_client::table
         .count()
@@ -98,21 +107,39 @@ pub async fn test_bootstrap_invalid_token_auth() {
 pub async fn test_challenge_auth() {
     let db = db::create_test_pool().await;
     let actors = GlobalActors::spawn(db.clone()).await.unwrap();
+    actors
+        .key_holder
+        .ask(Bootstrap {
+            seal_key_raw: SafeCell::new(b"test-seal-key".to_vec()),
+        })
+        .await
+        .unwrap();
 
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
     let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
 
-    // Pre-register key with key_type
     {
         let mut conn = db.get().await.unwrap();
-        insert_into(schema::useragent_client::table)
+        let id: i32 = insert_into(schema::useragent_client::table)
             .values((
                 schema::useragent_client::public_key.eq(pubkey_bytes.clone()),
                 schema::useragent_client::key_type.eq(1i32),
             ))
-            .execute(&mut conn)
+            .returning(schema::useragent_client::id)
+            .get_result(&mut conn)
             .await
             .unwrap();
+        integrity::sign_entity(
+            &mut conn,
+            &actors.key_holder,
+            &UserAgentCredentials {
+                pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
+                nonce: 1,
+            },
+            id,
+        )
+        .await
+        .unwrap();
     }
 
     let (server_transport, mut test_transport) = ChannelTransport::new();
@@ -122,7 +149,6 @@ pub async fn test_challenge_auth() {
         auth::authenticate(&mut props, server_transport).await
     });
 
-    // Send challenge request
     test_transport
         .send(auth::Inbound::AuthChallengeRequest {
             pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
@@ -131,7 +157,6 @@ pub async fn test_challenge_auth() {
         .await
         .unwrap();
 
-    // Read the challenge response
     let response = test_transport
         .recv()
         .await
@@ -168,14 +193,21 @@ pub async fn test_challenge_auth() {
 
 #[tokio::test]
 #[test_log::test]
-pub async fn test_challenge_auth_rejects_invalid_signature() {
+pub async fn test_challenge_auth_rejects_integrity_tag_mismatch_when_unsealed() {
     let db = db::create_test_pool().await;
     let actors = GlobalActors::spawn(db.clone()).await.unwrap();
 
+    actors
+        .key_holder
+        .ask(Bootstrap {
+            seal_key_raw: SafeCell::new(b"test-seal-key".to_vec()),
+        })
+        .await
+        .unwrap();
+
     let new_key = ed25519_dalek::SigningKey::generate(&mut rand::rng());
     let pubkey_bytes = new_key.verifying_key().to_bytes().to_vec();
 
-    // Pre-register key with key_type
     {
         let mut conn = db.get().await.unwrap();
         insert_into(schema::useragent_client::table)
@@ -195,6 +227,67 @@ pub async fn test_challenge_auth_rejects_invalid_signature() {
         auth::authenticate(&mut props, server_transport).await
     });
 
+    test_transport
+        .send(auth::Inbound::AuthChallengeRequest {
+            pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
+            bootstrap_token: None,
+        })
+        .await
+        .unwrap();
+
+    assert!(matches!(
+        task.await.unwrap(),
+        Err(auth::Error::Internal { .. })
+    ));
+}
+
+#[tokio::test]
+#[test_log::test]
+pub async fn test_challenge_auth_rejects_invalid_signature() {
+    let db = db::create_test_pool().await;
+    let actors = GlobalActors::spawn(db.clone()).await.unwrap();
+    actors
+        .key_holder
+        .ask(Bootstrap {
+            seal_key_raw: SafeCell::new(b"test-seal-key".to_vec()),
+        })
+        .await
+        .unwrap();
+
+    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();
+        let id: i32 = insert_into(schema::useragent_client::table)
+            .values((
+                schema::useragent_client::public_key.eq(pubkey_bytes.clone()),
+                schema::useragent_client::key_type.eq(1i32),
+            ))
+            .returning(schema::useragent_client::id)
+            .get_result(&mut conn)
+            .await
+            .unwrap();
+        integrity::sign_entity(
+            &mut conn,
+            &actors.key_holder,
+            &UserAgentCredentials {
+                pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
+                nonce: 1,
+            },
+            id,
+        )
+        .await
+        .unwrap();
+    }
+
+    let (server_transport, mut test_transport) = ChannelTransport::new();
+    let db_for_task = db.clone();
+    let task = tokio::spawn(async move {
+        let mut props = UserAgentConnection::new(db_for_task, actors);
+        auth::authenticate(&mut props, server_transport).await
+    });
+
     test_transport
         .send(auth::Inbound::AuthChallengeRequest {
             pubkey: AuthPublicKey::Ed25519(new_key.verifying_key()),
@@ -215,7 +308,6 @@ pub async fn test_challenge_auth_rejects_invalid_signature() {
         Err(err) => panic!("Expected Ok response, got Err({err:?})"),
     };
 
-    // Sign a different challenge value so signature format is valid but verification must fail.
     let wrong_challenge = arbiter_proto::format_challenge(challenge + 1, &pubkey_bytes);
     let signature = new_key.sign(&wrong_challenge);
 
@@ -226,8 +318,10 @@ pub async fn test_challenge_auth_rejects_invalid_signature() {
         .await
         .unwrap();
 
+    let expected_err = task.await.unwrap();
+    println!("Received expected error: {expected_err:#?}");
     assert!(matches!(
-        task.await.unwrap(),
+        expected_err,
         Err(auth::Error::InvalidChallengeSolution)
     ));
 }

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

@@ -2,14 +2,17 @@ use arbiter_server::{
     actors::{
         GlobalActors,
         keyholder::{Bootstrap, Seal},
-        user_agent::{UserAgentSession, session::connection::{
-            HandleUnsealEncryptedKey, HandleUnsealRequest, UnsealError,
-        }},
+        user_agent::{
+            UserAgentSession,
+            session::connection::{HandleUnsealEncryptedKey, HandleUnsealRequest, UnsealError},
+        },
     },
     db,
     safe_cell::{SafeCell, SafeCellHandle as _},
 };
 use chacha20poly1305::{AeadInPlace, XChaCha20Poly1305, XNonce, aead::KeyInit};
+use diesel::{ExpressionMethods as _, QueryDsl as _, insert_into};
+use diesel_async::RunQueryDsl;
 use kameo::actor::Spawn as _;
 use x25519_dalek::{EphemeralSecret, PublicKey};
 
@@ -148,4 +151,4 @@ pub async fn test_unseal_retry_after_invalid_key() {
         let response = user_agent.ask(encrypted_key).await;
         assert!(matches!(response, Ok(())));
     }
-}
+}

useragent/lib/screens/dashboard/evm/grants/widgets/grant_card.dart

@@ -30,7 +30,6 @@ class GrantCard extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    // Enrichment lookups — each watch scopes rebuilds to this card only
     final walletAccesses =
         ref.watch(walletAccessListProvider).asData?.value ?? const [];
     final wallets = ref.watch(evmProvider).asData?.value ?? const [];
@@ -44,7 +43,6 @@ class GrantCard extends ConsumerWidget {
     final theme = Theme.of(context);
     final muted = Palette.ink.withValues(alpha: 0.62);
 
-    // Resolve wallet_access_id → wallet address + client name
     final accessById = <int, ua_sdk.WalletAccessEntry>{
       for (final a in walletAccesses) a.id: a,
     };
@@ -94,7 +92,6 @@ class GrantCard extends ConsumerWidget {
         child: Row(
           crossAxisAlignment: CrossAxisAlignment.stretch,
           children: [
-            // Accent strip
             Container(
               width: 0.8.w,
               decoration: BoxDecoration(
@@ -104,7 +101,6 @@ class GrantCard extends ConsumerWidget {
                 ),
               ),
             ),
-            // Card body
             Expanded(
               child: Padding(
                 padding: EdgeInsets.symmetric(
@@ -114,7 +110,6 @@ class GrantCard extends ConsumerWidget {
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
-                    // Row 1: type badge · chain · spacer · revoke button
                     Row(
                       children: [
                         Container(
@@ -184,7 +179,6 @@ class GrantCard extends ConsumerWidget {
                       ],
                     ),
                     SizedBox(height: 0.8.h),
-                    // Row 2: wallet address · client name
                     Row(
                       children: [
                         Text(