Improve session privacy handling and cleanup logic

Added Contributor Covenant Code of Conduct to promote a harassment-free community.

CODE_OF_CONDUCT.md

@@ -0,0 +1,128 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+E-mail .
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at
+https://www.contributor-covenant.org/translations.

Cargo.toml

@@ -6,3 +6,6 @@ members = [
     "server",
     "wasm"
 ]
+
+[workspace.package]
+license = "MIT OR Apache-2.0"

Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /app
 
 COPY . .
 
-RUN cargo build -p server --release
+RUN cargo build -p chronoseal-server --bin chronoseal --release
 
 FROM debian:bookworm-slim
 
@@ -14,10 +14,14 @@ RUN apt-get update && apt-get install -y \
 
 WORKDIR /opt/chronoseal
 
-COPY --from=builder /app/target/release/server /usr/local/bin/chronoseal
+COPY --from=builder /app/target/release/chronoseal /usr/local/bin/chronoseal
+COPY frontend /usr/share/chronoseal/frontend
 
 EXPOSE 3000
 
 ENV RUST_LOG=info
+ENV CHRONOSEAL_DB_PATH=/var/lib/chronoseal/chronoseal.sqlite
+ENV CHRONOSEAL_FRONTEND_DIR=/usr/share/chronoseal/frontend
+ENV CHRONOSEAL_PID_FILE=/run/chronoseal.pid
 
-CMD ["chronoseal"]
+CMD ["chronoseal", "run"]

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Sunil Purushottam Thakare
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

LICENSE-APACHE

@@ -0,0 +1,178 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
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+
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+END OF TERMS AND CONDITIONS
+
+Copyright (c) 2026 Sunil Thakare
+
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+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
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+See the License for the specific language governing permissions and
+limitations under the License.

LICENSE-MIT

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Sunil Purushottam Thakare
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

LICENSE.md

@@ -1,674 +0,0 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
-
- Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
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README.md

@@ -1,127 +1,332 @@
 # ChronoSeal
 
-**Cryptographic anti-automation and browser attestation framework built with Rust, WASM, and behavioral continuity verification.**
+<p align="center">
+  <img src="logo/chronoseal.svg" width="220" alt="ChronoSeal Logo">
+</p>
 
-ChronoSeal makes it computationally expensive and operationally complex for AI scrapers, headless browsers, and automation tools to impersonate real users — while remaining completely invisible and frictionless to legitimate human visitors.
+<p align="center">
+  <strong>Cryptographic attestation daemon and anti-automation framework.</strong>
+</p>
+
+<p align="center">
+  Privacy-preserving • Unix-native • Lightweight • WASM-powered
+</p>
 
 ---
 
-## How It Works
+ChronoSeal is a lightweight cryptographic attestation daemon designed to raise the operational cost of browser automation, scraping, replay attacks, and synthetic interaction.
 
-ChronoSeal establishes a continuous, cryptographically verifiable proof-of-presence for every browser session. It is inspired by the heartbeat model used in IoT firmware (ESP32-class devices): the client must keep emitting signed, chained attestations, or the session is silently invalidated.
+Instead of relying on:
 
+* CAPTCHA systems
+* invasive browser fingerprinting
+* telemetry-heavy tracking
+* persistent identifiers
+
+ChronoSeal establishes a continuous cryptographic proof-of-runtime continuity using:
+
+* WASM execution
+* chained cryptographic heartbeats
+* behavioral entropy validation
+* ephemeral attestation state
+
+while remaining completely invisible and frictionless to legitimate human users.
+
+---
+
+# Features
+
+* CLI-first Unix-native architecture
+* Rich operational subcommands
+* Machine-readable JSON/YAML outputs
+* Hardened systemd integration
+* Graceful shutdown and signal handling
+* One-line installation workflow
+* Prometheus-compatible metrics
+* WASM-based client runtime
+* Ed25519 + Blake3 cryptographic chaining
+* Behavioral entropy validation
+* Randomized stack-machine verification
+* Silent rejection model
+* SQLite-backed ephemeral sessions
+* Connection-pooled runtime architecture
+* Lightweight deployment footprint
+* Docker and native deployment support
+
+---
+
+# Quick Start
+
+## Install
+
+```bash
+sudo bash scripts/install.sh
 ```
+
+## Check Status
+
+```bash
+chronoseal status --format json
+```
+
+## Health Probe
+
+```bash
+chronoseal health
+```
+
+## View Metrics
+
+```bash
+chronoseal metrics
+```
+
+## View Logs
+
+```bash
+sudo journalctl -u chronoseal -f
+```
+
+---
+
+# CLI
+
+```bash
+chronoseal --help
+```
+
+## Available Commands
+
+| Command      | Description                                |
+| ------------ | ------------------------------------------ |
+| `run`        | Run the ChronoSeal daemon                  |
+| `status`     | Report daemon status                       |
+| `health`     | Perform daemon health probe                |
+| `config`     | Validate and print effective configuration |
+| `generate`   | Generate operational material              |
+| `metrics`    | Output Prometheus metrics                  |
+| `stats`      | Print runtime statistics                   |
+| `completion` | Generate shell completions                 |
+| `version`    | Print version/build information            |
+
+---
+
+## Example
+
+```bash
+chronoseal status --format json
+```
+
+```json
+{
+  "running": true,
+  "healthy": true,
+  "bind": "0.0.0.0:3000",
+  "pid_file": "/run/chronoseal.pid",
+  "pid": 79459
+}
+```
+
+---
+
+# How It Works
+
+ChronoSeal establishes a continuous cryptographic proof-of-presence for browser sessions.
+
+The system is inspired by heartbeat validation models used in embedded and distributed systems.
+
+## Session Flow
+
+```text
 Browser                                    Server
   │                                           │
   │  WASM loads, generates Ed25519 keypair    │
   │  Private key never leaves WASM memory     │
   │                                           │
-  ├──── POST /init  { public_key } ──────────►│  Store session, salt, initial hash
+  ├──── POST /init  { public_key } ──────────►│
   │◄─── { session_id, salt, opcodes, H0 } ────┤
   │                                           │
-  │  Every 12–25s (jittered):                 │
-  │  ┌─ Collect mouse entropy                 │
-  │  ├─ Execute VM opcodes → stack state      │
-  │  ├─ Compute H(n) = Blake3(H(n-1) ║ …)   │
-  │  └─ Sign payload with Ed25519             │
+  │ Every 12–25s (randomized):                │
+  │  ┌─ Collect behavioral entropy            │
+  │  ├─ Execute VM opcode program             │
+  │  ├─ Advance Blake3 hash chain             │
+  │  └─ Sign payload using Ed25519            │
   │                                           │
-  ├──── POST /hb  { session_id, sig, … } ────►│  Verify sig → chain → behavior → fingerprint
-  │◄─── { status, next_salt } ────────────────┤  Rotate salt, advance chain
+  ├──── POST /heartbeat  { signed_payload } ─►│
+  │◄─── { status, next_salt } ────────────────┤
   │                                           │
-  │  On failure: server returns {"status":"ok"}│  Silent rejection — indistinguishable
+  │ Invalid sessions silently rejected        │
 ```
 
+The server validates:
+
+* signature authenticity
+* heartbeat continuity
+* replay resistance
+* behavioral entropy
+* timestamp validity
+* fingerprint sanity
+
 ---
 
-## Security Model
+# Security Model
 
-### What ChronoSeal protects against
+## What ChronoSeal Protects Against
 
-| Threat | Mechanism |
-|---|---|
-| Playwright / Puppeteer Stealth | Mouse entropy validation rejects synthetic or absent movement |
-| Replay attacks | Hash chain — each heartbeat references the previous hash; old payloads are invalid |
-| Signature forgery | Ed25519 private key generated inside WASM, never serialised or exposed to JS |
-| Clock manipulation | Server enforces ±30s timestamp window |
-| Credential sharing | Session is bound to a keypair generated fresh on every page load |
-| Flooding with fake sessions | Per-session rate limiting (5 req / 10s); stale entries evicted every 60s |
-| Passive analysis of traffic | Server always returns `{"status":"ok"}` — rejections are silent |
-
-### What ChronoSeal does not claim
-
-ChronoSeal is a cost-raising mechanism, not an impenetrable barrier. A sufficiently motivated adversary with a real browser, real input devices, and the patience to reverse the WASM can bypass it. The goal is to make scraping expensive and operationally complex enough to be impractical at scale.
+| Threat                   | Mechanism                             |
+| ------------------------ | ------------------------------------- |
+| Replay attacks           | Blake3 chained heartbeat continuity   |
+| Signature forgery        | Ed25519 keypair generated inside WASM |
+| Session cloning          | Ephemeral session-bound keypairs      |
+| Static scraping          | Runtime participation requirements    |
+| Naive browser automation | Behavioral continuity validation      |
+| Timestamp replay         | Drift-window enforcement              |
+| Session flooding         | Per-session rate limiting             |
 
 ---
 
-## Architecture
+## Silent Rejection Model
 
-```
-chronoseal-rs/
-├── shared/          Shared types, Blake3 hash-chain logic, constants
-├── server/          Axum HTTP server
-│   ├── routes/      /init and /hb handlers
-│   ├── session.rs   Session lifecycle: create, verify, advance chain
-│   ├── crypto.rs    Ed25519 signature verification (BTreeMap canonical JSON)
-│   ├── trust.rs     Behavioral signal validation (mouse speed, pauses)
-│   ├── fingerprint  Browser fingerprint sanity checks
-│   ├── vm.rs        Random opcode program generator
-│   ├── ratelimit.rs Token-bucket rate limiter with periodic eviction
-│   └── cleanup.rs   Background task: expire sessions + evict rate limiter
-├── wasm/            Rust → WASM client module
-│   ├── crypto.rs    Ed25519 keypair, signing, hash computation
-│   └── vm.rs        Stack machine executor (PUSH/ADD/SUB/MUL/XOR/AND/OR/ROT/NOT/HASH)
-└── frontend/        Vanilla JS glue
-    ├── heartbeat.js Session init, heartbeat scheduling, chain advancement
-    └── entropy.js   Mouse event collection
-```
+ChronoSeal intentionally avoids explicit rejection semantics.
 
-### Stack Machine
-
-The server generates a random program (8–16 opcodes) on session init. The client executes it on every heartbeat and includes the resulting stack state in the signed payload. This makes each heartbeat structurally unique without requiring any server round-trip.
-
-| Opcode | Mnemonic | Effect |
-|--------|----------|--------|
-| `0x00` | PUSH u32 | Push 4-byte little-endian literal |
-| `0x01` | ADD | Pop 2, push `a + b` (wrapping) |
-| `0x02` | SUB | Pop 2, push `a - b` (wrapping) |
-| `0x03` | MUL | Pop 2, push `a * b` (wrapping) |
-| `0x04` | XOR | Pop 2, push `a ^ b` |
-| `0x05` | AND | Pop 2, push `a & b` |
-| `0x06` | OR  | Pop 2, push `a \| b` |
-| `0x07` | ROT | Pop 2, push `a.rotate_left(b % 32)` |
-| `0x08` | NOT | Pop 1, push `!a` (unary) |
-| `0x09` | HASH | Blake3 of entire stack → single u32 |
-
-### Hash Chain
-
-```
-H(0) = Blake3( session_id ║ pub_key ║ salt₀ )
-
-H(n) = Blake3( saltₙ₋₁ ║ H(n-1) ║ timestamp ║ Blake3(entropy_json) ║ Blake3(stack_json) )
-```
-
-Each heartbeat must present `H(n-1)` matching what the server stored. Forging a valid `H(n)` requires knowing the private key (for the signature), the salt (server-side only), and all prior state.
-
-### Signature Canonical Form
-
-The client signs a JSON object with keys sorted alphabetically (matching `JSON.stringify(obj, Object.keys(obj).sort())`):
+Invalid sessions may still receive:
 
 ```json
-{
-  "entropyData":  { "events": [ { "x": …, "y": …, "t": … } ] },
-  "fingerprint":  { "aspectRatio": "…", "devicePixelRatio": "…", "hardwareConcurrency": … },
-  "prevHash":     "hex…",
-  "sessionId":    "hex…",
-  "stackState":   { "stack": […], "ip": … },
-  "timestamp":    1234567890123
-}
+{ "status": "ok" }
 ```
 
-The server reconstructs this using `BTreeMap` (alphabetical key order) before calling `VerifyingKey::verify_strict`.
+This prevents:
+
+* oracle-style probing
+* protocol learning
+* easy automation tuning
+* behavioral enumeration
 
 ---
 
-## SQLite Schema
+## What ChronoSeal Does Not Claim
+
+ChronoSeal is a cost-raising mechanism, not an impenetrable barrier.
+
+A sufficiently motivated adversary with:
+
+* real browsers
+* genuine input devices
+* enough reverse engineering effort
+
+can eventually bypass the system.
+
+The goal is to make automation:
+
+* expensive
+* operationally complex
+* difficult to scale
+* harder to replay deterministically
+
+---
+
+# Architecture
+
+```text
+chronoseal-rs/
+├── shared/          Shared types, constants, hash-chain logic
+├── server/          Axum HTTP daemon
+│   ├── routes/      API routes
+│   ├── session.rs   Session lifecycle management
+│   ├── crypto.rs    Ed25519 verification
+│   ├── trust.rs     Behavioral validation
+│   ├── fingerprint/ Browser sanity validation
+│   ├── vm.rs        Random opcode generator
+│   ├── ratelimit.rs Token bucket limiter
+│   ├── cleanup.rs   Session expiration lifecycle
+│   └── metrics.rs   Prometheus metrics
+├── wasm/            Rust → WASM runtime
+│   ├── crypto.rs    Signing + hash chaining
+│   └── vm.rs        Stack-machine executor
+├── frontend/        Lightweight JS integration
+├── scripts/         Build/install/dev scripts
+└── docs/            Project documentation
+```
+
+---
+
+# Stack Machine
+
+ChronoSeal includes a lightweight randomized stack-machine execution engine.
+
+The server generates a randomized opcode program during session initialization.
+
+The client executes this program on every heartbeat and includes the resulting stack state in the signed payload.
+
+This makes heartbeat payloads structurally dynamic.
+
+## Supported Opcodes
+
+| Opcode | Mnemonic | Effect                  |
+| ------ | -------- | ----------------------- |
+| `0x00` | PUSH     | Push literal            |
+| `0x01` | ADD      | Wrapping addition       |
+| `0x02` | SUB      | Wrapping subtraction    |
+| `0x03` | MUL      | Wrapping multiplication |
+| `0x04` | XOR      | Bitwise XOR             |
+| `0x05` | AND      | Bitwise AND             |
+| `0x06` | OR       | Bitwise OR              |
+| `0x07` | ROT      | Rotate left             |
+| `0x08` | NOT      | Unary inversion         |
+| `0x09` | HASH     | Blake3 stack hash       |
+
+---
+
+# Hash Chain
+
+ChronoSeal uses Blake3 chained continuity validation.
+
+## Initial Hash
+
+```text
+H(0) = Blake3( session_id ║ public_key ║ salt₀ )
+```
+
+## Heartbeat Progression
+
+```text
+H(n) = Blake3(
+    saltₙ₋₁ ║
+    H(n-1) ║
+    timestamp ║
+    Blake3(entropy_json) ║
+    Blake3(stack_json)
+)
+```
+
+Each heartbeat depends on:
+
+* prior continuity
+* prior server-issued salt
+* behavioral entropy
+* VM execution result
+* timestamp progression
+
+---
+
+# Signature Canonicalization
+
+Heartbeat payloads are serialized into canonical key order before signing.
+
+The server reconstructs payloads identically before:
+
+* Ed25519 verification
+* hash progression validation
+
+This prevents:
+
+* serialization inconsistencies
+* ambiguous signing layouts
+* malformed payload tricks
+
+---
+
+# SQLite Schema
 
 ```sql
 CREATE TABLE IF NOT EXISTS sessions (
@@ -136,101 +341,196 @@ CREATE TABLE IF NOT EXISTS sessions (
 );
 ```
 
-Sessions are stored in an in-memory SQLite database. All session state is lost on server restart by design — clients re-initialise transparently.
+ChronoSeal intentionally uses ephemeral session persistence.
+
+Session continuity is designed to reset transparently.
 
 ---
 
-## Build
+# Runtime Architecture
 
-### Prerequisites
+## Server Runtime
 
-- Rust stable (≥ 1.87)
-- [`wasm-pack`](https://rustwasm.github.io/wasm-pack/installer/)
+* Rust
+* Axum
+* Tokio
+* SQLite
+* `r2d2`
+* `thiserror`
 
-### WASM
+## Browser Runtime
 
-```bash
-wasm-pack build wasm --target web --release
-mv wasm/pkg frontend/pkg
-```
-
-### Server
-
-```bash
-cargo build -p server --release
-```
-
-### Dev (all-in-one)
-
-```bash
-bash scripts/dev.sh
-```
-
-The server serves the `frontend/` directory statically at `/` and the API at `/init` and `/hb`.
+* Rust → WASM
+* Ed25519 signing
+* Blake3 chaining
+* stack-machine execution
 
 ---
 
-## Deployment
+# Deployment
 
-### Native + systemd
+## Recommended Installation
 
 ```bash
-cargo build -p server --release
-sudo cp target/release/server /usr/local/bin/chronoseal
+sudo bash scripts/install.sh
+```
+
+The installer:
+
+* creates `chronoseal` service user
+* builds release artifacts
+* installs frontend assets
+* deploys hardened systemd service
+* enables and starts daemon
+
+---
+
+## Manual Installation
+
+```bash
+bash scripts/build.sh
+
+sudo cp target/release/chronoseal /usr/local/bin/
 sudo cp chronoseal.service /etc/systemd/system/
+
 sudo systemctl daemon-reload
 sudo systemctl enable --now chronoseal
 ```
 
-### Docker
+---
+
+## Docker
 
 ```bash
 docker compose up -d --build
 ```
 
-### Reverse Proxy
-
-Place ChronoSeal behind nginx, Nginx Proxy Manager, or HAProxy. Enable:
-
-- TLS 1.3
-- HTTP/2
-- Aggressive upstream timeouts (the heartbeat interval is 12–25s)
-
 ---
 
-## Integration
+# Development
 
-Drop two lines into any protected page:
+## Full Build
 
-```html
-<script type="module" src="/pkg/antibot_wasm.js"></script>
-<script type="module" src="/main.js"></script>
+```bash
+bash scripts/build.sh
 ```
 
-`main.js` calls `initHeartbeat()` which handles WASM loading, session init, and schedules all subsequent heartbeats automatically. There is no visible UI, no CAPTCHA, no user interaction required.
+## Development Mode
+
+```bash
+bash scripts/dev.sh
+```
+
+## Direct Execution
+
+```bash
+cargo run -p server -- run --bind 127.0.0.1:3000
+```
 
 ---
 
-## Configuration
+# Prerequisites
 
-All tunable constants are in `shared/src/constants.rs`:
+* Rust stable ≥ 1.87
+* `wasm-pack`
 
-| Constant | Default | Description |
-|---|---|---|
-| `SESSION_ID_LEN` | 32 bytes | Session ID entropy |
-| `SALT_LEN` | 16 bytes | Per-heartbeat salt size |
-| `HEARTBEAT_MIN_INTERVAL_MS` | 12 000 ms | Minimum heartbeat interval |
-| `HEARTBEAT_MAX_INTERVAL_MS` | 25 000 ms | Maximum heartbeat interval (uniform jitter) |
-| `EXPIRATION_MINUTES` | 30 min | Session lifetime after last heartbeat |
-| `RATE_LIMIT_COUNT` | 5 | Max heartbeats per window |
-| `RATE_LIMIT_WINDOW_SECS` | 10 s | Rate limit window |
-| `MAX_TIMESTAMP_DRIFT_MS` | 30 000 ms | Anti-replay timestamp window |
-| `MIN_MOUSE_TOTAL_DIST` | 10.0 px | Minimum cumulative mouse travel |
-| `MAX_MOUSE_AVG_SPEED` | 2.0 px/ms | Maximum average mouse speed |
-| `MIN_PAUSE_COUNT` | 1 | Minimum mouse pause events |
+Install:
+
+```bash
+cargo install wasm-pack
+```
 
 ---
 
-## License
+# Configuration
 
-[GPL-3.0](LICENSE.md)
+## Precedence
+
+```text
+CLI flags > CHRONOSEAL_* environment variables > config file > defaults
+```
+
+## Default Config Locations
+
+```text
+/etc/chronoseal/config.toml
+$XDG_CONFIG_HOME/chronoseal/config.toml
+~/.config/chronoseal/config.toml
+```
+
+## Runtime State
+
+```text
+~/.local/state/chronoseal/
+```
+
+---
+
+# Observability
+
+ChronoSeal exposes:
+
+* health probes
+* runtime statistics
+* Prometheus metrics
+
+## Metrics Example
+
+```bash
+chronoseal metrics
+```
+
+```text
+# HELP chronoseal_sessions Active ChronoSeal sessions
+# TYPE chronoseal_sessions gauge
+chronoseal_sessions 1
+```
+
+---
+
+# Lightweight Runtime
+
+Current release artifacts:
+
+```text
+chronoseal             ~8.5 MB
+chronoseal_wasm.wasm  ~719 KB
+```
+
+ChronoSeal intentionally avoids:
+
+* heavyweight frontend frameworks
+* Electron-style packaging
+* telemetry-heavy dependencies
+* oversized runtime models
+
+---
+
+# Philosophy
+
+ChronoSeal is intentionally not:
+
+* a surveillance framework
+* invasive browser fingerprinting
+* a CAPTCHA replacement
+* a telemetry ecosystem
+
+ChronoSeal is:
+
+* a cryptographic attestation runtime
+* a behavioral continuity engine
+* a proof-of-runtime framework
+* a lightweight Unix-native daemon
+
+---
+
+# License
+
+[MIT OR Apache-2.0](LICENSE)
+
+---
+
+# Project
+
+GitHub:
+https://github.com/thakares/chronoseal-rs

chronoseal.service

@@ -1,35 +1,36 @@
 [Unit]
-Description=ChronoSeal Anti-Bot Service
+Description=ChronoSeal Cryptographic Attestation Daemon
 After=network.target
+Wants=network-online.target
 
 [Service]
 Type=simple
-
 User=chronoseal
 Group=chronoseal
-
+ExecStart=/usr/local/bin/chronoseal run
 WorkingDirectory=/opt/chronoseal
-
-ExecStart=/usr/local/bin/chronoseal
-
 Restart=always
 RestartSec=3
+Environment=RUST_LOG=info
 
-NoNewPrivileges=true
-PrivateTmp=true
+# Hardening (production-grade)
 ProtectSystem=strict
-ProtectHome=true
-ProtectKernelTunables=true
-ProtectKernelModules=true
-ProtectControlGroups=true
-
-MemoryDenyWriteExecute=true
-RestrictRealtime=true
-RestrictSUIDSGID=true
-
-LockPersonality=true
-
+ProtectHome=yes
+NoNewPrivileges=yes
+PrivateTmp=yes
+ProtectKernelTunables=yes
+ProtectKernelModules=yes
+ProtectControlGroups=yes
+MemoryDenyWriteExecute=yes
+RestrictRealtime=yes
+RestrictSUIDSGID=yes
+LockPersonality=yes
 SystemCallArchitectures=native
+ReadWritePaths=/run/chronoseal.pid
+
+# Logging
+StandardOutput=journal
+StandardError=journal
 
 [Install]
 WantedBy=multi-user.target

docs/API.md

@@ -0,0 +1,216 @@
+# ChronoSeal — API Reference
+
+## Base URL
+
+All endpoints are relative to the server root. In development: `http://localhost:3000`.
+In production: your HTTPS domain via reverse proxy.
+
+---
+
+## Endpoints
+
+### `POST /init`
+
+Initialise a new session. Called once per page load, immediately after the
+WASM module generates an Ed25519 keypair.
+
+#### Request
+
+```http
+POST /init
+Content-Type: application/json
+```
+
+```json
+{
+  "public_key": "hex-encoded 32-byte Ed25519 verifying key"
+}
+```
+
+| Field | Type | Description |
+|---|---|---|
+| `public_key` | `string` | Hex-encoded 32-byte Ed25519 verifying key generated by the WASM module |
+
+#### Response `200 OK`
+
+```json
+{
+  "session_id":    "64-char hex string (32 bytes)",
+  "salt":          "32-char hex string (16 bytes)",
+  "opcodes_b64":   "base64-encoded VM program (8–16 opcodes)",
+  "initial_hash":  "64-char hex string (32 bytes Blake3)",
+  "expires_at":    1234567890123
+}
+```
+
+| Field | Type | Description |
+|---|---|---|
+| `session_id` | `string` | Opaque session identifier; include in every heartbeat |
+| `salt` | `string` | Initial salt; used to compute `H(0)` and first `H(1)` |
+| `opcodes_b64` | `string` | Base64 VM program; execute with `run_program()` on every heartbeat |
+| `initial_hash` | `string` | `H(0) = Blake3(session_id ║ pub_key ║ salt)`; the first `prev_hash` |
+| `expires_at` | `number` | Unix timestamp in milliseconds; session expires after 30 minutes of inactivity |
+
+#### Error
+
+Returns `500 Internal Server Error` only on server-side failures (DB errors,
+invalid public key length). No meaningful error body is returned.
+
+---
+
+### `POST /hb`
+
+Submit a heartbeat. Called every 12–25 seconds with uniform random jitter.
+
+#### Request
+
+```http
+POST /hb
+Content-Type: application/json
+```
+
+```json
+{
+  "session_id":   "64-char hex",
+  "prev_hash":    "64-char hex",
+  "timestamp":    1234567890123,
+  "entropy_data": {
+    "events": [
+      { "x": 412.0, "y": 308.5, "t": 1234.567 },
+      { "x": 415.2, "y": 310.1, "t": 1285.123 }
+    ]
+  },
+  "stack_state": {
+    "stack": [2971406957, 1234567890],
+    "ip": 42
+  },
+  "fingerprint": {
+    "aspectRatio":        "1.7777777778",
+    "devicePixelRatio":   "2",
+    "hardwareConcurrency": 8
+  },
+  "signature": "128-char hex Ed25519 signature"
+}
+```
+
+| Field | Type | Description |
+|---|---|---|
+| `session_id` | `string` | Session ID from `/init` |
+| `prev_hash` | `string` | Hash chain head from previous heartbeat (or `initial_hash` for the first) |
+| `timestamp` | `number` | `Date.now()` in milliseconds; must be within ±30s of server time |
+| `entropy_data.events` | `array` | Mouse events since previous heartbeat; each has `x`, `y` (px), `t` (performance.now ms) |
+| `stack_state.stack` | `array` | `u32[]` result of executing the VM program |
+| `stack_state.ip` | `number` | Instruction pointer after execution |
+| `fingerprint.aspectRatio` | `string` | `(screen.width / screen.height).toFixed(10)` |
+| `fingerprint.devicePixelRatio` | `string` | `String(window.devicePixelRatio)` |
+| `fingerprint.hardwareConcurrency` | `number` | `navigator.hardwareConcurrency \|\| 1` |
+| `signature` | `string` | Hex-encoded 64-byte Ed25519 signature over the canonical payload |
+
+#### Canonical Signing Payload
+
+The client signs the following JSON object. Top-level keys must be sorted
+alphabetically. Nested object keys follow their natural serialisation order.
+
+```json
+{
+  "entropyData":  { "events": [{ "t": …, "x": …, "y": … }] },
+  "fingerprint":  { "aspectRatio": "…", "devicePixelRatio": "…", "hardwareConcurrency": … },
+  "prevHash":     "…",
+  "sessionId":    "…",
+  "stackState":   { "ip": …, "stack": […] },
+  "timestamp":    …
+}
+```
+
+Note: field names in the signing payload use camelCase (`sessionId`,
+`prevHash`, `entropyData`, `stackState`) while the request body uses
+snake_case (`session_id`, `prev_hash`, `entropy_data`, `stack_state`).
+
+#### Response `200 OK` — Accepted
+
+```json
+{
+  "status":    "ok",
+  "next_salt": "32-char hex string (16 bytes)"
+}
+```
+
+The client must:
+1. Capture `sentSalt = currentSalt` before updating.
+2. Set `currentSalt = next_salt`.
+3. Compute `prevHash = compute_next_hash(prevHash, timestamp, entropyJson, stackStateJson, sentSalt)`.
+
+#### Response `200 OK` — Rejected
+
+```json
+{
+  "status": "ok"
+}
+```
+
+`next_salt` is absent. The response body is intentionally identical in
+structure. Rejections are silent — the caller cannot distinguish a validation
+failure from a rate limit hit or an expired session.
+
+The client should log a warning and continue scheduling heartbeats (they will
+continue to fail until the page is reloaded and a new session is established).
+
+---
+
+## Validation Rules (Server-Side)
+
+Heartbeats are rejected (silently) if any of the following checks fail:
+
+| Check | Condition for rejection |
+|---|---|
+| Rate limit | > 5 requests per 10-second window for this `session_id` |
+| Session not found | `session_id` not in SQLite |
+| Session expired | `current_time_ms > expires_at` |
+| Signature invalid | Ed25519 verification fails against stored public key |
+| Hash chain broken | `hex(prev_hash) ≠ stored last_hash` |
+| Timestamp drift | `\|server_now_ms - timestamp\| > 30 000` |
+| Insufficient mouse events | `events.len() < 3` |
+| Insufficient mouse distance | `total_dist < 10.0 px` |
+| Mouse speed too high | `total_dist / total_time_ms > 2.0 px/ms` |
+| No mouse pauses | `pause_count < 1` |
+| Invalid aspect ratio | `ar < 0.5` or `ar > 3.0` |
+| Invalid devicePixelRatio | `dpr ≤ 0.0` or `dpr > 5.0` |
+| Zero hardwareConcurrency | `hardware_concurrency == 0` |
+
+---
+
+## Hash Chain Specification
+
+```
+H(0) = Blake3( session_id_bytes ║ pub_key_bytes ║ salt₀_bytes )
+
+H(n) = Blake3(
+    saltₙ₋₁_bytes
+  ║ H(n-1)_bytes
+  ║ timestamp_u64_le_bytes
+  ║ Blake3( UTF-8( JSON(entropy_data) ) )
+  ║ Blake3( UTF-8( JSON(stack_state)  ) )
+)
+```
+
+All inputs are concatenated in the order shown. `timestamp` is encoded as a
+64-bit unsigned integer in little-endian byte order. JSON serialisation of
+`entropy_data` and `stack_state` uses the field order defined by the shared
+Rust types (serde derive, no custom ordering).
+
+---
+
+## WASM API
+
+The WASM module (`antibot_wasm`) exports the following functions to JavaScript:
+
+| Function | Signature | Description |
+|---|---|---|
+| `generate_keypair()` | `() → string` | Generate Ed25519 keypair; return hex public key. Private key stored in WASM memory. |
+| `get_public_key()` | `() → string` | Return hex public key, or `""` if not initialised. |
+| `sign_message(msg)` | `(string) → string` | Sign UTF-8 string; return hex signature, or `""` if not initialised. |
+| `compute_next_hash(prev, ts, entropy, stack, salt)` | `(string, u64, string, string, string) → string` | Compute next Blake3 chain hash; all inputs/output hex or JSON strings. |
+| `run_program(b64)` | `(string) → JsValue` | Execute base64 VM program; return `{ stack: u32[], ip: number }`. |
+
+All functions return empty strings on error rather than panicking.
+Callers must check for empty return values before using the result.

docs/ARCHITECTURE.md

@@ -1,36 +1,381 @@
-# ChronoSeal Architecture
+# ChronoSeal — Architecture
 
-## Core Principles
+## Overview
 
-- Continuous browser attestation
-- Cryptographic heartbeat chains
-- WASM-isolated secrets
-- Behavioral entropy verification
-- Silent mitigation
+ChronoSeal is a stateless, cryptographic browser attestation framework. Its
+purpose is to make automated clients (headless browsers, AI scrapers, API
+harvesters) computationally expensive and operationally complex to operate,
+while remaining completely invisible to real human users.
 
-## Components
+The design is inspired by the heartbeat model used in embedded IoT firmware:
+a device that stops sending signed, chained attestations is assumed to be
+offline or compromised. ChronoSeal applies the same principle to browser
+sessions.
 
-### WASM Runtime
+---
 
-Responsible for:
-- heartbeat generation
-- signature generation
-- entropy collection
-- VM execution
+## Design Principles
 
-### Server
+**Stateless per request.** The server carries no per-request state beyond what
+is stored in SQLite keyed on `session_id`. Every HTTP request is independently
+verifiable.
 
-Responsible for:
-- session verification
-- trust scoring
-- chain validation
-- mitigation
+**Silent failure.** Validation failures never return an error status or an
+error body. The server always responds `{"status":"ok"}` and simply omits
+`next_salt`. The client degrades gracefully. Attackers cannot enumerate
+validation rules by probing error responses.
+
+**Private key isolation.** The Ed25519 signing key is generated inside the
+WASM module and never serialised, never exposed to the JavaScript environment,
+and never transmitted. It exists only in WASM linear memory for the lifetime
+of the page.
+
+**Layered validation.** A heartbeat must pass five independent checks: session
+existence, expiry, signature, hash chain, and behavioral signals. Bypassing
+one layer is not sufficient.
+
+**Cost asymmetry.** Each heartbeat requires a real browser environment, mouse
+activity, correct WASM execution, chain state synchronisation, and a valid
+Ed25519 signature over a time-windowed payload. For an automated client, the
+synchronisation burden alone makes scaled operation expensive.
+
+### High-Level Design
+
+- **Core**: Rust + Axum (async web framework)
+- **Storage**: In-memory SQLite (fast, ephemeral per process — restarts are clean)
+- **Client**: WASM + Rust (runs in browser for proof generation)
+- **Security Model**: Behavioral analysis + hash chaining + entropy scoring
+- **Deployment**: Static musl binary, systemd service, optional Docker
+
+### Key Components
+
+- `shared/` — Types, constants, crypto primitives used by server and WASM
+- `server/` — Axum routes, session management, trust engine, rate limiting, cleanup tasks
+- `wasm/` — Client-side proof generation
+- `frontend/` — Static assets served by the application
+
+### Unix-Native Design Decisions
+
+- Runs as a proper systemd service with strict sandboxing
+- All state is either in-memory or in standard locations (`/run/`, `/var/log/`, `/etc/`)
+- Graceful shutdown and reload support via signals
+- Logging designed for `journalctl` and structured parsing
+- Configuration will be fully runtime (no recompile needed)
+
+### Design Goal
+
+ChronoSeal should feel as natural to use as `nginx` or `redis-server` on a Linux system.
+---
+
+## Component Map
+
+```
+┌─────────────────────────────────────────────────────────┐
+│  Browser                                                │
+│                                                         │
+│  ┌─────────────┐   ┌──────────────┐   ┌─────────────┐   │
+│  │  entropy.js │   │ heartbeat.js │   │ transport.js│   │
+│  │             │   │              │   │             │   │
+│  │ mousemove   │──►│ orchestrates │──►│ fetch POST  │   │
+│  │ event ring  │   │ init + HB    │   │ /init  /hb  │   │
+│  └─────────────┘   └──────┬───────┘   └─────────────┘   │
+│                           │                             │
+│                    ┌──────▼───────────────────────┐     │
+│                    │  WASM Module (antibot_wasm)  │     │
+│                    │                              │     │
+│                    │  crypto.rs      vm.rs        │     │
+│                    │  ├ generate_keypair()        │     │
+│                    │  ├ sign_message()            │     │
+│                    │  ├ compute_next_hash()       │     │
+│                    │  └ run_program()             │     │
+│                    └──────────────────────────────┘     │
+└─────────────────────────────────────────────────────────┘
+                          │ HTTPS
+┌─────────────────────────▼───────────────────────────────┐
+│  Server (Axum)                                          │
+│                                                         │
+│  routes/init.rs          routes/heartbeat.rs            │
+│       │                          │                      │
+│       └──────────┬───────────────┘                      │
+│                  ▼                                      │
+│            session.rs                                   │
+│            ├ create_session()                           │
+│            └ verify_heartbeat()                         │
+│                  │                                      │
+│       ┌──────────┼──────────────┐                       │
+│       ▼          ▼              ▼                       │
+│  crypto.rs   trust.rs    fingerprint.rs                 │
+│  (sig verify) (mouse     (aspect ratio,                 │
+│               speed)      DPR, HW conc.)                │
+│       │                                                 │
+│       ▼                                                 │
+│  shared::hashing  (Blake3 hash chain)                   │
+│       │                                                 │
+│       ▼                                                 │
+│  storage.rs  (in-memory SQLite)                         │
+│                                                         │
+│  ratelimit.rs   cleanup.rs   vm.rs   middleware.rs      │
+└─────────────────────────────────────────────────────────┘
+```
+
+---
+
+## Session Lifecycle
+
+### 1. Initialisation — `POST /init`
+
+```
+Client                                  Server
+  │                                        │
+  │  generate Ed25519 keypair (in WASM)    │
+  │  pub_key = verifying_key.to_bytes()    │
+  │                                        │
+  ├─── { public_key: hex(pub_key) } ──────►│
+  │                                        │  session_id = rand::random::<[u8;32]>()
+  │                                        │  salt₀      = rand::random::<[u8;16]>()
+  │                                        │  H(0) = Blake3(session_id║pub_key║salt₀)
+  │                                        │  opcodes = generate_random_program(8..=16)
+  │                                        │  INSERT INTO sessions …
+  │                                        │
+  │◄── { session_id, salt, opcodes_b64,    │
+  │      initial_hash, expires_at } ───────┤
+  │                                        │
+  │  prevHash    = initial_hash            │
+  │  currentSalt = salt                    │
+  │  opcodesB64  = opcodes_b64             │
+```
+
+### 2. Heartbeat — `POST /hb`
+
+Fired every 12–25 seconds with uniform random jitter.
+
+```
+Client                                  Server
+  │                                        │
+  │  stackState = run_program(opcodesB64)  │
+  │  events     = collectEntropy(lastTime) │
+  │  ts         = Date.now()               │
+  │                                        │
+  │  signable = {                          │
+  │    entropyData, fingerprint,           │  ← keys sorted alphabetically
+  │    prevHash, sessionId,                │
+  │    stackState, timestamp               │
+  │  }                                     │
+  │  sig = sign_message(                   │
+  │    JSON.stringify(signable, keys.sort))│
+  │                                        │
+  ├─── { session_id, prev_hash, timestamp, │
+  │      entropy_data, stack_state,        │
+  │      fingerprint, signature } ────────►│
+  │                                        │  1. Rate limit check
+  │                                        │  2. Lookup session, check expiry
+  │                                        │  3. Verify Ed25519 signature
+  │                                        │  4. Verify hash chain continuity
+  │                                        │  5. Validate timestamp window ±30s
+  │                                        │  6. Validate mouse behavior
+  │                                        │  7. Validate fingerprint signals
+  │                                        │  8. Compute H(n), rotate salt
+  │                                        │  9. UPDATE sessions …
+  │                                        │
+  │◄── { status: "ok", next_salt } ────────┤
+  │                                        │
+  │  sentSalt    = currentSalt  ◄── captured BEFORE rotation
+  │  currentSalt = next_salt               │
+  │  prevHash    = compute_next_hash(      │
+  │    prevHash, ts, entropy,              │
+  │    stackState, sentSalt)               │
+```
+
+### 3. Failure Path
+
+On any validation failure the server returns `{"status":"ok"}` with no
+`next_salt`. The client logs a warning and continues scheduling heartbeats.
+The chain is broken — subsequent heartbeats will also fail silently.
+No error is surfaced to the page or its visitors.
+
+---
+
+## Cryptographic Protocol
+
+### Key Generation
+
+```
+Ed25519 keypair generated via ed25519-dalek + rand::thread_rng (OS-seeded)
+Private key:  stored in WASM thread_local, never leaves WASM memory
+Public key:   32 bytes, hex-encoded, sent to server at init
+```
+
+### Hash Chain
+
+```
+H(0) = Blake3( session_id ║ pub_key ║ salt₀ )
+
+H(n) = Blake3(
+    saltₙ₋₁                    ← server-side only, rotated each heartbeat
+  ║ H(n-1)                     ← must match stored last_hash
+  ║ timestamp_u64_le
+  ║ Blake3( JSON(entropy_data) )
+  ║ Blake3( JSON(stack_state)  )
+)
+```
+
+Salt rotation means an attacker who intercepts a heartbeat cannot compute
+future chain links without also intercepting every subsequent server response.
+
+### Canonical Signing Payload
+
+The signed message is a JSON object with top-level keys sorted alphabetically,
+serialised with no extra whitespace:
+
+```json
+{
+  "entropyData":  { "events": [{"t":…,"x":…,"y":…}] },
+  "fingerprint":  { "aspectRatio":"…","devicePixelRatio":"…","hardwareConcurrency":… },
+  "prevHash":     "hex…",
+  "sessionId":    "hex…",
+  "stackState":   { "ip":…,"stack":[…] },
+  "timestamp":    1234567890123
+}
+```
+
+The server reconstructs this using `std::collections::BTreeMap` (alphabetical
+key order) before calling `VerifyingKey::verify_strict`. Any field mismatch,
+key order difference, or whitespace difference causes a signature failure.
+
+### Hashing Algorithm
+
+Blake3 is used throughout: hash chain links, entropy data digest, stack state
+digest, and the VM HASH opcode. Blake3 is chosen for speed in WASM,
+resistance to length-extension attacks, and a clean Rust API.
+
+---
+
+## Stack Machine
+
+The server generates a random program on session init. The client executes it
+on every heartbeat and includes the resulting `StackState { stack, ip }` in
+the signed payload. This ensures each heartbeat carries unique, verifiable
+computation without additional round-trips.
+
+### Instruction Set
+
+| Opcode | Mnemonic | Operand       | Stack effect | Description |
+|--------|----------|---------------|--------------|-------------|
+| `0x00` | PUSH     | u32 (4B LE)   | +1           | Push literal |
+| `0x01` | ADD      | —             | −1           | `a + b` wrapping |
+| `0x02` | SUB      | —             | −1           | `a - b` wrapping |
+| `0x03` | MUL      | —             | −1           | `a * b` wrapping |
+| `0x04` | XOR      | —             | −1           | `a ^ b` |
+| `0x05` | AND      | —             | −1           | `a & b` |
+| `0x06` | OR       | —             | −1           | `a \| b` |
+| `0x07` | ROT      | —             | −1           | `a.rotate_left(b % 32)` |
+| `0x08` | NOT      | —             | 0            | `!a` (unary) |
+| `0x09` | HASH     | —             | -(depth-1)   | Blake3 of all stack items → single u32 |
+
+The generator ensures ≥ 2 items on the stack before any binary opcode.
+NOT (0x08) does not change depth. HASH resets depth to 1.
+
+---
+
+## Behavioral Validation
+
+### Mouse Entropy
+
+Every heartbeat includes the mouse events collected since the previous
+heartbeat. Server checks:
+
+| Check | Threshold |
+|---|---|
+| Minimum event count | ≥ 3 |
+| Minimum cumulative distance | ≥ 10 px |
+| Maximum average speed | ≤ 2.0 px/ms (distance / elapsed ms) |
+| Minimum pause count | ≥ 1 (movement < 0.2 px over > 50 ms) |
+
+### Browser Fingerprint
+
+| Signal | Valid range |
+|---|---|
+| `aspectRatio` (width / height) | 0.5 – 3.0 |
+| `devicePixelRatio` | 0 < dpr ≤ 5.0 |
+| `hardwareConcurrency` | ≥ 1 |
+
+---
+
+## Rate Limiting
+
+Token bucket per `session_id`: 5 requests / 10-second window.
+Stale entries evicted every 60 seconds by the cleanup task.
+Rate-limited responses are indistinguishable from validation failures.
+
+---
+
+## SQLite Schema
+
+```sql
+CREATE TABLE IF NOT EXISTS sessions (
+    session_id    TEXT     PRIMARY KEY,
+    public_key    BLOB     NOT NULL,   -- 32-byte Ed25519 verifying key
+    salt          BLOB     NOT NULL,   -- 16-byte current salt
+    last_hash     BLOB     NOT NULL,   -- 32-byte Blake3 chain head
+    chain_length  INTEGER  NOT NULL DEFAULT 1,
+    created_at    INTEGER  NOT NULL,   -- Unix ms
+    last_seen     INTEGER  NOT NULL,   -- Unix ms
+    expires_at    INTEGER  NOT NULL    -- Unix ms
+);
+```
+
+In-memory SQLite — all sessions lost on server restart by design.
+Clients re-initialise transparently on the next page load.
+
+---
 
 ## Threat Model
 
-Designed to increase:
-- scraping cost
-- operational complexity
-- synchronization burden
+### In Scope
 
-ChronoSeal does not attempt impossible perfect prevention.
+| Threat | Mitigation |
+|---|---|
+| Playwright / Puppeteer / Selenium | Mouse entropy + behavioral validation |
+| Puppeteer Stealth, undetected-chromedriver | Signature over VM execution state |
+| Heartbeat replay | Hash chain + ±30s timestamp window |
+| Signature forgery | Private key isolated in WASM memory |
+| Parallel session sharing | Each session bound to a unique keypair |
+| Brute-forced session IDs | 256-bit random entropy |
+| Flooding with fake session IDs | Rate limiter + periodic HashMap eviction |
+| Traffic analysis | Uniform `{"status":"ok"}` on all failure paths |
+
+### Out of Scope
+
+| Threat | Reason |
+|---|---|
+| Real browser with real human input | Indistinguishable from a legitimate user |
+| WASM reverse engineering | Obfuscation is not a security primitive |
+| Server-side compromise | Outside the scope of client attestation |
+
+ChronoSeal raises cost and complexity of automated access. It is not a
+cryptographic proof of humanity and does not claim to be.
+
+---
+
+## Module Reference
+
+| Path | Purpose |
+|---|---|
+| `shared/src/protocol.rs` | Shared types: `InitRequest`, `HeartbeatRequest`, `StackState`, … |
+| `shared/src/hashing.rs` | `initial_hash`, `next_chain_hash`, `hash_stack` |
+| `shared/src/constants.rs` | All tunable parameters |
+| `server/src/routes/init.rs` | `POST /init` handler |
+| `server/src/routes/heartbeat.rs` | `POST /hb` handler |
+| `server/src/session.rs` | `create_session`, `verify_heartbeat` |
+| `server/src/crypto.rs` | `verify_signature` — BTreeMap canonical JSON |
+| `server/src/trust.rs` | `validate_mouse` — speed, distance, pauses |
+| `server/src/fingerprint.rs` | `validate` — aspect ratio, DPR, HW concurrency |
+| `server/src/vm.rs` | `generate_random_program` |
+| `server/src/ratelimit.rs` | `RateLimiter::check`, `evict_stale` |
+| `server/src/cleanup.rs` | Background loop: expire sessions + evict rate limiter |
+| `server/src/storage.rs` | SQLite init, `current_time_ms` |
+| `wasm/src/crypto.rs` | `generate_keypair`, `sign_message`, `compute_next_hash` |
+| `wasm/src/vm.rs` | `run_program` — stack machine executor |
+| `frontend/heartbeat.js` | Session init, heartbeat loop, chain advancement |
+| `frontend/entropy.js` | Mouse event ring buffer, `collectEntropy` |
+| `frontend/transport.js` | `sendRequest` fetch wrapper |

docs/DEPLOYMENT.md

@@ -1,36 +1,346 @@
-# Deployment
+# ChronoSeal — Deployment Guide
 
-## Native
+## Prerequisites
+
+| Tool | Minimum version | Purpose |
+|---|---|---|
+| Rust | 1.87 stable | Server + WASM compilation |
+| wasm-pack | 0.13 | WASM build and packaging |
+| Docker + Compose | 24 / 2.x | Container deployment |
+| nginx / NPM / HAProxy | any | TLS termination, reverse proxy |
+
+Install Rust: https://rustup.rs  
+Install wasm-pack: `cargo install wasm-pack`
+
+---
+
+## Build
+
+### 1. Build the WASM module
+
+```bash
+wasm-pack build wasm --target web --release
+mv wasm/pkg frontend/pkg
+```
+
+This produces `frontend/pkg/antibot_wasm.js` and `frontend/pkg/antibot_wasm_bg.wasm`,
+which are loaded by `frontend/main.js` at runtime.
+
+### 2. Build the server
+
+```bash
+cargo build -p server --release
+```
+
+Binary output: `target/release/server`
+
+### 3. Build both (convenience script)
+
+```bash
+bash scripts/build.sh
+```
+
+---
+
+## Running
+
+### Development
+
+```bash
+bash scripts/dev.sh
+```
+
+Runs the server with `cargo run --release`. The server serves the `frontend/`
+directory statically at `/` via tower-http `ServeDir`.
+
+Open `http://localhost:3000` in a browser. Open DevTools console — heartbeats
+should appear every 12–25 seconds. No visible UI is rendered; the protection
+is entirely silent.
+
+### Production (native binary)
 
 ```bash
 cargo build -p server --release
 sudo cp target/release/server /usr/local/bin/chronoseal
 ```
 
-## systemd
+Set environment variables before running:
 
 ```bash
-sudo cp chronoseal.service /etc/systemd/system/
-
-sudo systemctl daemon-reload
-sudo systemctl enable chronoseal
-sudo systemctl start chronoseal
+export RUST_LOG=info      # or warn for quieter output
+chronoseal
 ```
 
+The server binds to `0.0.0.0:3000` by default. Place behind a reverse proxy
+for TLS — do not expose port 3000 directly.
+
+---
+
+## systemd
+
+### Service file
+
+The provided `chronoseal.service` includes hardened systemd sandboxing:
+
+```
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=true
+ProtectKernelTunables=true
+ProtectKernelModules=true
+ProtectControlGroups=true
+MemoryDenyWriteExecute=true
+RestrictRealtime=true
+RestrictSUIDSGID=true
+LockPersonality=true
+SystemCallArchitectures=native
+```
+
+### Install
+
+```bash
+# Create a dedicated system user
+sudo useradd --system --no-create-home --shell /usr/sbin/nologin chronoseal
+
+# Install binary and frontend
+sudo cp target/release/server /usr/local/bin/chronoseal
+sudo mkdir -p /opt/chronoseal/frontend
+sudo cp -r frontend/ /opt/chronoseal/frontend/
+sudo chown -R chronoseal:chronoseal /opt/chronoseal
+
+# Install and enable service
+sudo cp chronoseal.service /etc/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable --now chronoseal
+```
+
+### Verify
+
+```bash
+sudo systemctl status chronoseal
+journalctl -u chronoseal -f
+```
+
+---
+
 ## Docker
 
+### Build and run
+
 ```bash
 docker compose up -d --build
 ```
 
+### docker-compose.yml overview
+
+```yaml
+services:
+  chronoseal:
+    build: .
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    environment:
+      RUST_LOG: info
+    tmpfs:
+      - /tmp
+```
+
+The `tmpfs` mount ensures the in-memory SQLite database is never written to
+disk, even if Docker's storage driver were to flush the container filesystem.
+
+### Dockerfile stages
+
+The Dockerfile uses a two-stage build:
+
+1. `rust:1.87-bookworm` — compiles the server binary
+2. `debian:bookworm-slim` — minimal runtime image with only `ca-certificates`
+
+The WASM module and frontend must be built separately (wasm-pack requires a
+browser toolchain not present in the server image) and mounted or copied into
+the container at `/opt/chronoseal/frontend/`.
+
+```bash
+# Build WASM first
+wasm-pack build wasm --target web --release
+mv wasm/pkg frontend/pkg
+
+# Then build and run the container
+docker compose up -d --build
+```
+
+Or mount the pre-built frontend as a volume:
+
+```yaml
+volumes:
+  - ./frontend:/opt/chronoseal/frontend:ro
+```
+
+---
+
 ## Reverse Proxy
 
-Recommended:
-- nginx
-- Nginx Proxy Manager
-- HAProxy
+ChronoSeal must be served over HTTPS. The heartbeat payload contains a
+timestamp; if traffic is observable in plaintext, timing attacks become
+easier. TLS 1.3 is strongly recommended.
 
-Enable:
-- HTTP/2
-- TLS 1.3
-- aggressive timeout policies
+### nginx
+
+```nginx
+server {
+    listen 443 ssl http2;
+    server_name your.domain.com;
+
+    ssl_certificate     /etc/letsencrypt/live/your.domain.com/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/your.domain.com/privkey.pem;
+    ssl_protocols       TLSv1.3;
+    ssl_ciphers         ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
+
+    # Tight timeouts — heartbeat interval is 12–25s
+    proxy_read_timeout  35s;
+    proxy_send_timeout  10s;
+
+    location / {
+        proxy_pass         http://127.0.0.1:3000;
+        proxy_http_version 1.1;
+        proxy_set_header   Host $host;
+        proxy_set_header   X-Real-IP $remote_addr;
+        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+    }
+}
+
+server {
+    listen 80;
+    server_name your.domain.com;
+    return 301 https://$host$request_uri;
+}
+```
+
+### Nginx Proxy Manager
+
+1. Add a new Proxy Host pointing to `http://chronoseal:3000`
+2. Enable SSL, Request Let's Encrypt certificate
+3. Enable HTTP/2, Force SSL
+4. Under Advanced, add:
+   ```
+   proxy_read_timeout 35s;
+   proxy_send_timeout 10s;
+   ```
+
+### HAProxy
+
+```haproxy
+frontend https_front
+    bind *:443 ssl crt /etc/haproxy/certs/your.domain.pem alpn h2,http/1.1
+    default_backend chronoseal_back
+
+backend chronoseal_back
+    server chronoseal 127.0.0.1:3000 check
+    timeout connect 5s
+    timeout server  35s
+```
+
+---
+
+## Integration into an Existing Site
+
+ChronoSeal is designed to run as a sidecar — its `/init` and `/hb` endpoints
+can be proxied from any existing web server. The frontend assets (`pkg/`) need
+to be served from the same origin as the protected page (or CORS must be
+configured).
+
+### Option A — Serve everything from ChronoSeal
+
+ChronoSeal serves `frontend/` statically. Put your protected HTML inside
+`frontend/` and let ChronoSeal serve it directly.
+
+### Option B — Proxy only the API endpoints
+
+Keep your existing server. Proxy `/init` and `/hb` to ChronoSeal, and serve
+the WASM and JS assets from your CDN or existing static file server.
+
+```nginx
+# On your existing server:
+location ~ ^/(init|hb)$ {
+    proxy_pass http://127.0.0.1:3000;
+}
+```
+
+Add to your protected pages:
+
+```html
+<script type="module" src="/pkg/antibot_wasm.js"></script>
+<script type="module" src="/main.js"></script>
+```
+
+---
+
+## Configuration
+
+All parameters are in `shared/src/constants.rs`. Recompile after changes.
+
+| Constant | Default | Notes |
+|---|---|---|
+| `SESSION_ID_LEN` | 32 bytes | 256-bit entropy — do not reduce |
+| `SALT_LEN` | 16 bytes | Per-heartbeat salt |
+| `HEARTBEAT_MIN_INTERVAL_MS` | 12 000 ms | Increase to reduce server load |
+| `HEARTBEAT_MAX_INTERVAL_MS` | 25 000 ms | Jitter upper bound |
+| `EXPIRATION_MINUTES` | 30 min | Session TTL after last heartbeat |
+| `RATE_LIMIT_COUNT` | 5 | Max heartbeats per window per session |
+| `RATE_LIMIT_WINDOW_SECS` | 10 s | Rate limit window |
+| `MAX_TIMESTAMP_DRIFT_MS` | 30 000 ms | Anti-replay window; account for NTP skew |
+| `MIN_MOUSE_TOTAL_DIST` | 10.0 px | Lower for low-activity pages |
+| `MAX_MOUSE_AVG_SPEED` | 2.0 px/ms | Raise if legitimate users are rejected |
+| `MIN_PAUSE_COUNT` | 1 | Minimum natural pause events |
+
+---
+
+## Observability
+
+ChronoSeal uses `tracing` with `tracing-subscriber`. Log levels:
+
+| Level | Events |
+|---|---|
+| `INFO` | Server start, request method + path + status |
+| `WARN` | Heartbeat validation failures (with session ID and reason) |
+| `DEBUG` | Rate limit hits |
+
+```bash
+RUST_LOG=info   chronoseal   # production
+RUST_LOG=debug  chronoseal   # development
+RUST_LOG=warn   chronoseal   # minimal output
+```
+
+Log format is plain text to stdout. Pipe to `journald`, `fluentd`, or any
+log aggregator via stdout capture.
+
+---
+
+## Health Check
+
+The server has no dedicated `/health` endpoint. Use a TCP check on port 3000,
+or a lightweight HTTP check on `GET /` (which serves `index.html`).
+
+```bash
+# Docker health check (add to docker-compose.yml if needed)
+healthcheck:
+  test: ["CMD", "curl", "-sf", "http://localhost:3000/"]
+  interval: 30s
+  timeout: 5s
+  retries: 3
+```
+
+---
+
+## Security Checklist
+
+- [ ] TLS 1.3 enabled, TLS 1.0/1.1 disabled
+- [ ] HTTP/2 enabled
+- [ ] Port 3000 not exposed to the public internet (only via reverse proxy)
+- [ ] `RUST_LOG=warn` or `info` in production (not `debug` — session IDs appear in logs)
+- [ ] systemd service running as `chronoseal` user with hardened sandbox
+- [ ] `MemoryDenyWriteExecute=true` in service file (prevents JIT in process)
+- [ ] CORS `CorsLayer::permissive()` replaced with origin-restricted policy for production
+- [ ] Frontend assets served over the same HTTPS origin as protected pages

docs/DESIGN-PHILOSOPHY.md

@@ -0,0 +1,41 @@
+# ChronoSeal Design Philosophy
+
+**"Everything is a File" — Unix-Native Software Design**
+
+ChronoSeal is intentionally built as a **first-class citizen of Linux**. The entire application is designed to behave like a well-engineered native file within the Unix filesystem.
+
+### Why This Philosophy Matters
+
+ChronoSeal is designed so that administrators can operate, monitor, configure, and integrate it using the same reliable, transparent, and trusted tools and patterns they already use on Linux systems — without fighting the operating environment.
+
+### Core Principles
+
+- **Everything is a File**: The application must be controllable, inspectable, and composable through standard Unix interfaces (CLI, files, signals, pipes, and environment).
+- **CLI as Source of Truth**: All operations — starting, stopping, configuring, monitoring, and debugging — must be possible from the command line with excellent discoverability.
+- **Behave Like a Native File**: Predictable lifecycle management through commands, signals (`SIGHUP`, `SIGTERM`, `SIGUSR1`), logs, configuration files, and standard process semantics.
+- **Composability**: Must work naturally with pipes, redirection, scripts, systemd, Ansible, Docker, and orchestration tools.
+- **Observability by Default**: All important state and metrics should be accessible as text or structured data.
+- **Minimal Friction, Maximum Durability**: One-line installer, world-class `--help`, proper man pages, and decades-long maintainability are non-negotiable.
+- **Respect for the OS**: Follows Linux Filesystem Hierarchy Standard (FHS), XDG Base Directory specification, and hardened systemd practices.
+
+### Non-Goals
+
+ChronoSeal is **not** designed to be:
+- Cloud-first or vendor-specific
+- Browser-first or JavaScript-heavy
+- Dependency-heavy or framework-driven
+- GUI-centric (any graphical interface must be a thin wrapper)
+- Telemetry-oriented or privacy-invasive
+- Optimized for rapid prototyping at the cost of long-term reliability
+
+These non-goals help keep the project focused on stability, simplicity, security, and deep Unix integration.
+
+### Development Mindset
+
+- Production robustness, security, and long-term sustainability take clear precedence over development speed.
+- Every design decision is evaluated against one question:  
+  **“Does this make ChronoSeal feel like it naturally belongs in `/usr/bin/`?”**
+
+This philosophy guided the complete refactoring of ChronoSeal and continues to drive all future development.
+
+**Status**: Core architecture and systemd integration completed. Rich CLI, runtime configuration system, and one-line installer are in active development.

docs/PRIVACY POLICY.md

@@ -0,0 +1,278 @@
+# ChronoSeal Privacy & Design Principles
+
+## Privacy-First Browser Attestation Framework
+
+ChronoSeal is a lightweight, privacy-first browser attestation framework designed to resist:
+
+- automated bots
+- AI-driven browser automation
+- scripted abuse
+- browser surveillance ecosystems
+
+Unlike conventional anti-bot systems, ChronoSeal is intentionally designed to operate **without collecting or storing client identity data**.
+
+---
+
+# Core Philosophy
+
+ChronoSeal verifies:
+
+- session continuity
+- runtime coherence
+- cryptographic synchronization
+
+It does **not** verify:
+
+- personal identity
+- browsing history
+- behavioral profiles
+- long-term reputation
+
+The framework is built around one principle:
+
+> Verify live browser participation without turning users into telemetry.
+
+---
+
+# Privacy-First By Architecture
+
+ChronoSeal is intentionally engineered to avoid becoming:
+
+- a tracking platform
+- a fingerprinting database
+- a telemetry pipeline
+- a surveillance system
+
+## ChronoSeal Does NOT Store
+
+- IP addresses
+- Browser history
+- Persistent fingerprints
+- User profiles
+- Behavioral telemetry
+- Tracking identifiers
+- Device databases
+- Long-term session history
+- Cross-site correlation data
+
+No client-side personal information is persisted.
+
+---
+
+# Stateless Trust Model
+
+ChronoSeal focuses on:
+
+- ephemeral runtime verification
+- cryptographic continuity
+- synchronized challenge progression
+- live execution integrity
+
+The server only validates:
+
+- whether the current browser session behaves like a coherent participant *right now*
+
+ChronoSeal does not maintain:
+
+- user identity databases
+- reputation systems
+- persistent surveillance records
+
+---
+
+# Anti-Bot Without Surveillance
+
+Most modern anti-bot systems rely heavily on:
+
+- fingerprinting
+- behavioral tracking
+- telemetry aggregation
+- centralized analytics
+
+ChronoSeal deliberately rejects this model.
+
+Instead, ChronoSeal uses:
+
+- synchronized cryptographic chains
+- WASM-isolated signing
+- protocol continuity
+- transient verification state
+
+This provides bot resistance while preserving user privacy.
+
+---
+
+# Lightweight By Design
+
+ChronoSeal is intentionally engineered to remain:
+
+- compact
+- dependency-light
+- operationally simple
+- Unix-native
+
+## Current Footprint
+
+### Server Binary
+
+Compiled x86_64 Linux server binary:
+
+- ~8.4 MB
+
+### WASM Runtime
+
+`chronoseal_wasm_bg.wasm`
+
+- ~218 KB
+
+### Full WASM Package
+
+Entire generated WASM package:
+
+- ~720 KB
+
+Includes:
+
+- WASM runtime
+- JavaScript glue code
+- Type definitions
+
+---
+
+# No Frontend Framework Dependency
+
+ChronoSeal does not depend on:
+
+- React
+- Angular
+- Vue
+- Electron
+- Node.js runtime
+- Browser bundler ecosystems
+
+The browser runtime uses:
+
+- native ES modules
+- direct WebAssembly loading
+- lightweight JavaScript glue
+
+This minimizes:
+
+- dependency complexity
+- supply-chain risk
+- build fragility
+- browser overhead
+
+---
+
+# Clean Repository Philosophy
+
+ChronoSeal keeps generated artefacts out of version control.
+
+## What Is NOT Stored In The Repository
+
+| Path | Reason |
+|---|---|
+| `wasm/pkg/` | Generated build output |
+| `frontend/pkg/` | Generated serve-time artefacts |
+| `target/` | Standard Rust build artefacts |
+
+Generated binaries change frequently and are reproducible from source.
+
+The repository intentionally stores:
+
+- source code
+- architecture
+- reproducible build logic only
+
+---
+
+# Unix-Native Operational Model
+
+ChronoSeal is designed as:
+
+- infrastructure software
+- not browser-centric SaaS
+
+Core operational principles:
+
+- CLI-first operation
+- systemd-native deployment
+- structured logs
+- explicit configuration
+- inspectable runtime behavior
+- minimal hidden state
+
+ChronoSeal should feel natural on Linux systems:
+
+- simple to deploy
+- easy to audit
+- understandable years later
+
+---
+
+# Security Through Operational Asymmetry
+
+ChronoSeal increases attacker cost through:
+
+- synchronization burden
+- runtime continuity requirements
+- WASM-isolated cryptographic execution
+- chained session progression
+
+It does not attempt:
+
+- invasive tracking
+- permanent identification
+- surveillance-driven scoring
+
+---
+
+# Design Goals
+
+ChronoSeal prioritizes:
+
+- Privacy
+- Simplicity
+- Transparency
+- Operational clarity
+- Long-term maintainability
+- Minimalism
+- Unix-native behavior
+- Low deployment friction
+
+---
+
+# Non-Goals
+
+ChronoSeal is intentionally NOT:
+
+- A surveillance platform
+- A telemetry collection system
+- A browser fingerprinting database
+- An analytics engine
+- A cloud lock-in service
+- A JavaScript-heavy frontend platform
+- An advertising or tracking framework
+
+---
+
+# Summary
+
+ChronoSeal is designed to prove:
+
+> “A live browser session is coherently participating right now.”
+
+without storing:
+
+- who the user is
+- where they came from
+- what they previously did
+
+It is a lightweight, privacy-preserving, Unix-native browser attestation framework focused on:
+
+- anti-bot resistance
+- anti-automation
+- operational simplicity
+
+without compromising user privacy.

docs/THREAT_MODEL.md

@@ -0,0 +1,205 @@
+# ChronoSeal — Threat Model
+
+## Purpose
+
+This document defines what ChronoSeal is designed to protect against, what
+it explicitly does not protect against, and the reasoning behind each
+design decision in security terms.
+
+ChronoSeal is a **cost-raising mechanism**. It does not claim to make
+automated access impossible. It makes automated access expensive, complex
+to maintain, and operationally fragile at scale.
+
+---
+
+## Assets Being Protected
+
+| Asset | Description |
+|---|---|
+| Web page content | HTML, rendered data, scraped text |
+| API responses | JSON endpoints that serve structured data |
+| Server compute | CPU and bandwidth consumed by automated clients |
+| Rate-limited resources | Endpoints with per-user quotas |
+| Behavioral analytics | Metrics polluted by bot traffic |
+
+---
+
+## Attacker Profiles
+
+### Level 1 — Script Kiddie / Commodity Scraper
+
+**Tools:** `curl`, `requests`, `scrapy`, simple HTTP clients.  
+**Capability:** No browser environment. Cannot execute JavaScript or WASM.  
+**ChronoSeal response:** Session never initialises. No `session_id` is ever
+presented to `/hb`. Content gated behind session validation is never served.
+
+### Level 2 — Headless Browser Operator
+
+**Tools:** Playwright, Puppeteer, Selenium, undetected-chromedriver.  
+**Capability:** Full browser environment. Can execute JavaScript and WASM.
+Cannot easily synthesise realistic mouse entropy or maintain hash chain state
+across concurrent sessions.  
+**ChronoSeal response:** Mouse entropy validation rejects absent or synthetic
+movement. Hash chain requires per-session state synchronisation. Scaling to
+hundreds of concurrent sessions requires proportional infrastructure.
+
+### Level 3 — Stealth Automation
+
+**Tools:** Puppeteer Stealth, rebrowser-patches, custom CDP clients with
+evasion patches.  
+**Capability:** Patches `navigator.webdriver`, spoofs browser fingerprints,
+can inject synthetic mouse events. May partially pass behavioral checks.  
+**ChronoSeal response:** Ed25519 signature over the full payload (including
+behavioral state and VM execution result) means the attacker must also
+correctly execute the WASM program and maintain chain continuity. The private
+key is generated fresh per page load and never exposed — it cannot be
+extracted from a legitimate session and reused.
+
+### Level 4 — Sophisticated Adversary
+
+**Tools:** Full browser farm with real input devices, WASM reverse engineering,
+custom chain maintenance infrastructure.  
+**Capability:** Can pass all current ChronoSeal checks given sufficient
+engineering effort.  
+**ChronoSeal response:** Significantly increases operational cost. A browser
+farm with real input devices costs orders of magnitude more than a commodity
+scraper fleet. ChronoSeal is not designed to stop this attacker — no client-
+side protection can.
+
+---
+
+## Attack Vectors and Mitigations
+
+### Replay Attack
+
+**Attack:** Capture a valid heartbeat payload and retransmit it.  
+**Mitigation:**
+- Timestamp window (±30 seconds): replayed payloads are rejected after 30s.
+- Hash chain: each heartbeat must present `H(n-1)` matching the server's
+  stored state. A replayed heartbeat presents a stale hash that no longer
+  matches after one successful heartbeat has advanced the chain.
+
+### Signature Forgery
+
+**Attack:** Construct a valid-looking heartbeat payload without the private key.  
+**Mitigation:** Ed25519 with 128-bit security. The private key is generated
+inside WASM `thread_local` memory, never serialised, never passed to
+JavaScript, never transmitted. Forgery requires breaking Ed25519 or
+extracting the key from WASM memory — neither is practical.
+
+### Key Extraction
+
+**Attack:** Inspect WASM linear memory to extract the private signing key.  
+**Mitigation:** The key is stored in a Rust `thread_local! { RefCell<Option<SigningKey>> }`.
+It has no exported symbol and is not referenced by any exported WASM function
+that returns raw memory. An attacker with full DevTools access to the WASM
+memory can extract it from one session, but it is useless for other sessions
+(fresh keypair per page load) and expires with the session.
+
+### Hash Chain Forgery
+
+**Attack:** Compute a valid `H(n)` without the server-side salt.  
+**Mitigation:** Each chain link incorporates `saltₙ₋₁`, which is a 16-byte
+random value known only to the server and returned (once) in the heartbeat
+response. An attacker cannot compute `H(n+1)` without first receiving
+`saltₙ` from a successful heartbeat response, which requires a valid signature
+and all other checks to pass.
+
+### Session Hijacking
+
+**Attack:** Steal a `session_id` and use it from a different client.  
+**Mitigation:** `session_id` alone is insufficient — the attacker also needs
+the private key (to produce valid signatures) and the current chain state
+(to present the correct `prev_hash`). All three are required simultaneously.
+
+### Enumeration of Validation Rules
+
+**Attack:** Send malformed heartbeats and analyse error responses to map
+validation logic.  
+**Mitigation:** All failure paths return `{"status":"ok"}` with no `next_salt`.
+There is no error code, no error message, and no status difference between
+a rate limit hit, an invalid signature, a broken chain, and a behavioral
+rejection.
+
+### DoS via Session Flooding
+
+**Attack:** Open thousands of sessions to exhaust the rate limiter's HashMap
+memory.  
+**Mitigation:** Rate limiter entries are evicted every 60 seconds by the
+cleanup task. Each entry is a small `(u32, Instant)` tuple; even at 100,000
+concurrent fake sessions, the HashMap occupies roughly 10–15 MB, which is
+well within normal server memory budgets. Sessions themselves expire after 30
+minutes of inactivity and are purged from SQLite.
+
+### Clock Manipulation
+
+**Attack:** Manipulate the client's `Date.now()` to bypass the timestamp
+window.  
+**Mitigation:** The timestamp is included in the signed payload. Manipulating
+it requires also forging the signature. The server validates against its own
+clock — client-side clock manipulation cannot help without the private key.
+
+### Synthetic Mouse Events
+
+**Attack:** Inject programmatic `mousemove` events via `dispatchEvent` or
+CDP input simulation.  
+**Mitigation:** Synthetic events often fail the pause check (no natural dwell
+periods), produce unrealistically uniform speed profiles, or fail the minimum
+distance threshold. Generating convincingly human mouse traces at scale
+requires either real input devices or sophisticated probabilistic models —
+both significantly increase operational cost.
+
+---
+
+## What ChronoSeal Does Not Protect Against
+
+| Limitation | Explanation |
+|---|---|
+| Real browsers with real users acting as bots | A human operating a browser manually is indistinguishable from a legitimate visitor. ChronoSeal cannot address this. |
+| Server-side vulnerabilities | ChronoSeal is a client attestation layer. It does not protect the server from injection, authentication bypass, or other backend vulnerabilities. |
+| Highly resourced nation-state actors | Out of scope for a client-side protection layer. |
+| Content visible before session establishment | If the protected content is rendered before the first heartbeat, it can be scraped without a session. Gate content on session validity server-side. |
+| Perfect bot prevention | No client-side mechanism can be. WASM can be reverse engineered. ChronoSeal raises cost, not an impenetrable barrier. |
+
+---
+
+## Operational Security Notes
+
+### Log Level
+
+Do not run with `RUST_LOG=debug` in production. The debug log includes
+`session_id` values, which are sensitive identifiers. Use `warn` or `info`.
+
+### CORS Policy
+
+The default `CorsLayer::permissive()` is suitable for development only.
+In production, restrict allowed origins to your own domain:
+
+```rust
+CorsLayer::new()
+    .allow_origin("https://your.domain.com".parse::<HeaderValue>().unwrap())
+    .allow_methods([Method::POST])
+    .allow_headers([header::CONTENT_TYPE])
+```
+
+### TLS
+
+Serve exclusively over TLS 1.3. The heartbeat payload contains timestamps
+and behavioral signals. While each payload is signed and cannot be forged,
+plaintext transmission leaks behavioral patterns and timing information that
+could assist a sophisticated attacker.
+
+### In-Memory SQLite
+
+All session state is lost on server restart. This is intentional — there is
+no persistent state to steal. Clients transparently re-initialise. If your
+deployment restarts frequently (e.g. rolling deploys), sessions will be lost
+more often; tune `HEARTBEAT_MIN_INTERVAL_MS` and `EXPIRATION_MINUTES`
+accordingly so clients recover quickly.
+
+---
+
+## Security Disclosure
+
+See [SECURITY.md](../SECURITY.md) for the vulnerability disclosure policy
+and contact details.

docs/WASM_BUILD.md

@@ -0,0 +1,301 @@
+# ChronoSeal — WASM Build Guide
+
+## Overview
+
+The client-side cryptographic core of ChronoSeal is written in Rust and
+compiled to WebAssembly (WASM). The JavaScript frontend (`heartbeat.js`)
+imports functions from this WASM module to generate keypairs, sign heartbeat
+payloads, compute hash chain links, and execute the stack machine program.
+
+The import line in `heartbeat.js`:
+
+```js
+import init, { generate_keypair, sign_message, compute_next_hash, run_program }
+  from './pkg/antibot_wasm.js';
+```
+
+`./pkg/antibot_wasm.js` is a **generated file**. It does not exist in the
+repository and must be produced by building the `wasm/` crate before running
+the server.
+
+---
+
+## How the WASM Module is Built
+
+The tool that compiles Rust to WASM and generates the JavaScript glue is
+[`wasm-pack`](https://rustwasm.github.io/wasm-pack/).
+
+When you run:
+
+```bash
+wasm-pack build wasm --target web --release
+```
+
+wasm-pack does the following in sequence:
+
+1. Compiles `wasm/src/lib.rs` (and its submodules) to a `.wasm` binary using
+   the `wasm32-unknown-unknown` target.
+2. Runs `wasm-bindgen` to inspect every `#[wasm_bindgen]`-annotated function
+   and struct and generate a JavaScript wrapper for each one.
+3. Optionally runs `wasm-opt` (from Binaryen) to size-optimise the binary.
+4. Writes all output to `wasm/pkg/`.
+
+---
+
+## Output: `wasm/pkg/`
+
+After a successful build, `wasm/pkg/` contains:
+
+```
+wasm/pkg/
+├── antibot_wasm.js          ← ES module; the file heartbeat.js imports
+├── antibot_wasm_bg.wasm     ← compiled WASM binary (~300–800 KB release)
+├── antibot_wasm_bg.js       ← internal memory bridge (do not import directly)
+├── antibot_wasm.d.ts        ← TypeScript type declarations
+├── antibot_wasm_bg.d.ts     ← TypeScript declarations for the bg module
+└── package.json
+```
+
+### `antibot_wasm.js`
+
+This is the public entry point. It contains:
+
+- An `init()` function that fetches and instantiates the `.wasm` binary.
+- One JavaScript wrapper function for each `#[wasm_bindgen]` export in
+  `wasm/src/`:
+
+| Rust export | JS wrapper | Description |
+|---|---|---|
+| `generate_keypair()` | `generate_keypair()` | Generate Ed25519 keypair; return hex public key |
+| `get_public_key()` | `get_public_key()` | Return hex public key, or `""` if not initialised |
+| `sign_message(msg)` | `sign_message(msg)` | Sign string; return hex signature, or `""` if not initialised |
+| `compute_next_hash(prev, ts, entropy, stack, salt)` | `compute_next_hash(...)` | Compute next Blake3 chain hash |
+| `run_program(b64)` | `run_program(b64)` | Execute base64 VM program; return `{ stack, ip }` |
+
+### `antibot_wasm_bg.wasm`
+
+The compiled binary. The `.bg` suffix means "background" — this is the raw
+WASM that `antibot_wasm.js` loads internally. You should not reference this
+file directly in your HTML.
+
+---
+
+## Step-by-Step Build
+
+### 1. Install the Rust WASM target
+
+```bash
+rustup target add wasm32-unknown-unknown
+```
+
+This is a one-time step. Without it, the Rust compiler cannot produce WASM
+output.
+
+### 2. Install wasm-pack
+
+```bash
+cargo install wasm-pack
+```
+
+Or via the installer script:
+
+```bash
+curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+```
+
+Verify:
+
+```bash
+wasm-pack --version
+# wasm-pack 0.13.x
+```
+
+### 3. Build the WASM module
+
+From the project root:
+
+```bash
+wasm-pack build wasm --target web --release
+```
+
+`--target web` produces an ES module (`import`/`export` syntax) suitable for
+use directly in a browser without a bundler. Other targets (`bundler`,
+`nodejs`, `no-modules`) produce different output formats and are not
+compatible with the ChronoSeal frontend as written.
+
+`--release` enables Rust's release optimisations (inlining, dead code
+elimination, size reduction). Omit it during development for faster builds
+and better panic messages.
+
+### 4. Move the output to the frontend
+
+```bash
+rm -rf frontend/pkg
+mv wasm/pkg frontend/pkg
+```
+
+The frontend expects the WASM module at `frontend/pkg/antibot_wasm.js`
+because `heartbeat.js` imports from `./pkg/antibot_wasm.js` relative to
+the `frontend/` directory, which is where the server's static file handler
+is rooted.
+
+---
+
+## Using the Build Script
+
+The convenience script at `scripts/build.sh` performs all steps in order:
+
+```bash
+bash scripts/build.sh
+```
+
+This builds the WASM module, moves it to `frontend/pkg/`, and then builds
+the server binary. Run this for a clean full build before deployment.
+
+For development iteration where you are only changing Rust WASM code:
+
+```bash
+wasm-pack build wasm --target web   # (omit --release for speed)
+rm -rf frontend/pkg && mv wasm/pkg frontend/pkg
+```
+
+For development where you are only changing server code:
+
+```bash
+cargo build -p server
+```
+
+---
+
+## How `heartbeat.js` Loads the Module
+
+`heartbeat.js` uses a standard ES module dynamic import pattern:
+
+```js
+import init, { generate_keypair, sign_message, compute_next_hash, run_program }
+  from './pkg/antibot_wasm.js';
+
+export async function initHeartbeat() {
+    // 1. Fetch and instantiate the .wasm binary
+    await init();
+
+    // 2. Generate keypair — private key stored in WASM memory only
+    const pubKeyHex = generate_keypair();
+
+    // 3. Send public key to server, receive session_id and chain seed
+    // ...
+}
+```
+
+`init()` is the default export from `antibot_wasm.js`. It fetches
+`antibot_wasm_bg.wasm` (from the same `pkg/` directory) via `fetch()`,
+compiles it in the browser's WASM engine, and links it to the JS glue
+layer. After `await init()` returns, all the named exports
+(`generate_keypair`, `sign_message`, etc.) are ready to call.
+
+The `init()` call must complete before any other WASM function is called.
+Calling `sign_message()` or `compute_next_hash()` before `await init()`
+returns will produce an empty string (the module is not yet instantiated).
+
+---
+
+## Serving the WASM Binary
+
+Browsers require WASM files to be served with the correct MIME type:
+
+```
+Content-Type: application/wasm
+```
+
+Most web servers set this automatically for `.wasm` files. If you see the
+error:
+
+```
+WebAssembly.instantiate(): Response has unsupported MIME type
+```
+
+Add the MIME type to your server configuration:
+
+**nginx:**
+```nginx
+types {
+    application/wasm  wasm;
+}
+```
+
+**Apache `.htaccess`:**
+```apache
+AddType application/wasm .wasm
+```
+
+The Axum `ServeDir` handler used by ChronoSeal's built-in static server
+sets the correct MIME type automatically via `tower-http`.
+
+---
+
+## What Is Not in the Repository
+
+| Path | Why excluded |
+|---|---|
+| `wasm/pkg/` | Generated build output — changes on every build |
+| `frontend/pkg/` | Same generated output, moved to serve location |
+| `target/` | Standard Rust build artefacts |
+
+Both `wasm/pkg/` and `frontend/pkg/` are listed in `.gitignore`. Committing
+them would bloat the repository (the `.wasm` binary alone is 300–800 KB),
+create noisy diffs on every rebuild, and give a false impression that the
+WASM module is pre-built and ready to use without a build step.
+
+---
+
+## Troubleshooting
+
+### `wasm32-unknown-unknown` target not found
+
+```
+error[E0463]: can't find crate for `std`
+```
+
+Fix:
+
+```bash
+rustup target add wasm32-unknown-unknown
+```
+
+### `wasm-pack` not found
+
+```bash
+cargo install wasm-pack
+```
+
+### `wasm-opt` not found (warning, not an error)
+
+wasm-pack prints a warning if `wasm-opt` is not installed. The build still
+succeeds; the binary is just not size-optimised.
+
+```bash
+# On Debian/Ubuntu/Arch
+sudo apt install binaryen      # Debian/Ubuntu
+sudo pacman -S binaryen        # Arch
+```
+
+### `antibot_wasm_bg.wasm` fetch fails (404)
+
+The `.wasm` file is not being served from `frontend/pkg/`. Verify:
+
+```bash
+ls /mnt/Programs/ChronoSeal/frontend/pkg/
+# Should list: antibot_wasm.js  antibot_wasm_bg.wasm  ...
+```
+
+If the directory is empty or missing, re-run the build steps above.
+
+### MIME type error in browser
+
+See the "Serving the WASM Binary" section above.
+
+### `sign_message` or `generate_keypair` returns empty string
+
+The WASM keypair has not been initialised. Ensure `await init()` and
+`generate_keypair()` are called (and awaited) before any other WASM
+function. Check the browser console for any errors during `init()`.

docs/chronoseal.example.toml

@@ -0,0 +1,5 @@
+bind = "0.0.0.0:3000"
+pid_file = "/run/chronoseal.pid"
+db_path = "/var/lib/chronoseal/chronoseal.sqlite"
+frontend_dir = "/usr/share/chronoseal/frontend"
+log_file = "/var/log/chronoseal/chronoseal.jsonl"

frontend/heartbeat.js

@@ -1,8 +1,10 @@
-import init, { generate_keypair, sign_message, compute_next_hash, run_program } from './pkg/antibot_wasm.js';
+import init, { generate_keypair, sign_message, compute_next_hash, run_program } from './pkg/chronoseal_wasm.js';
 import { collectEntropy } from './entropy.js';
 import { sendRequest } from './transport.js';
 
 let session, prevHash, currentSalt, opcodesB64, lastTime;
+let minInterval = 12000;
+let maxInterval = 25000;
 
 export async function initHeartbeat() {
     await init();
@@ -12,12 +14,14 @@ export async function initHeartbeat() {
     prevHash = initResp.initial_hash;
     currentSalt = initResp.salt;
     opcodesB64 = initResp.opcodes_b64;
+    minInterval = initResp.heartbeat_min_interval_ms || 12000;
+    maxInterval = initResp.heartbeat_max_interval_ms || 25000;
     lastTime = performance.now();
     scheduleNext();
 }
 
 function scheduleNext() {
-    const delay = 12000 + Math.random() * 13000;
+    const delay = minInterval + Math.random() * (maxInterval - minInterval);
     setTimeout(sendHeartbeat, delay);
 }
 

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+   style="font-style:normal;font-variant:normal;font-weight:600;font-stretch:normal;font-size:160px;font-family:'URW Gothic';-inkscape-font-specification:'URW Gothic, Semi-Bold';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#1f2024;fill-opacity:1"
+   id="tspan49">chrono</tspan>seal</tspan></text><path
+   fill="#4b4d51"
+   opacity="1"
+   stroke="none"
+   d="m 791.89376,306.36264 c 1.04068,-1.03091 1.90903,-2.38956 3.14896,-3.04166 11.48425,-6.03955 22.98721,-12.04745 34.57742,-17.88034 8.52002,-4.28775 14.37558,-10.49713 14.23218,-20.46771 -0.14127,-9.82202 -6.25309,-15.51495 -14.66742,-19.5827 -61.76651,-29.85993 -123.47361,-59.84277 -185.21183,-89.76129 -10.48242,-5.07981 -20.81335,-10.5555 -31.58477,-14.93764 -19.71186,-8.01936 -39.87799,-8.40881 -59.18305,0.84148 -71.77522,34.39209 -143.33662,69.23047 -215.00562,103.84463 -8.4082,4.06091 -14.3217,9.84101 -14.3998,19.74008 -0.079,10.00498 5.5228,16.22797 14.0898,20.54743 12.3277,6.21567 24.5123,12.71484 37.3422,19.41369 7.5143,3.93381 14.4228,7.5896 21.3786,11.15274 31.6877,16.23212 63.4056,32.40552 95.0778,48.66782 14.943,7.67261 29.7496,15.61227 44.73052,23.20911 8.44464,4.28232 16.79547,9.15341 25.75525,11.93237 18.81989,5.83722 37.10712,3.93353 54.83185,-5.55777 25.51599,-13.66336 51.41541,-26.61407 77.2135,-39.74655 30.82071,-15.68933 61.7009,-31.26196 92.58359,-46.82907 1.56006,-0.78641 3.38776,-1.0419 5.09082,-1.54462 z"
+   id="path1"
+   style="fill:#4a4d53;fill-opacity:1" /></svg>

scripts/build.sh

@@ -1,10 +1,16 @@
 #!/bin/bash
-set -e
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
 echo "Building WASM..."
-cd ../wasm
-wasm-pack build --target web
-mv pkg ../frontend/pkg
+cd "$ROOT/wasm"
+wasm-pack build --target web --release
+rm -rf "$ROOT/frontend/pkg"
+mv pkg "$ROOT/frontend/pkg"
+
 echo "Building server..."
-cd ../server
-cargo build --release
+cd "$ROOT"
+cargo build -p chronoseal-server --bin chronoseal --release
+
 echo "Done."

scripts/install.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "🚀 ChronoSeal Installer"
+echo "======================"
+
+# Create system user
+if ! id -u chronoseal &>/dev/null; then
+    sudo useradd --system --no-create-home --shell /usr/sbin/nologin chronoseal
+    echo "✓ Created chronoseal system user"
+fi
+
+# Build
+echo "→ Building ChronoSeal..."
+cd "$(dirname "$0")/.."
+bash scripts/build.sh
+
+# Install binary
+sudo install -Dm755 target/release/chronoseal /usr/local/bin/chronoseal
+echo "✓ Installed binary to /usr/local/bin/chronoseal"
+
+# Install frontend assets
+sudo mkdir -p /opt/chronoseal
+sudo cp -r frontend /opt/chronoseal/
+sudo chown -R chronoseal:chronoseal /opt/chronoseal
+echo "✓ Installed frontend assets"
+
+# Install systemd service
+sudo cp chronoseal.service /etc/systemd/system/chronoseal.service
+sudo systemctl daemon-reload
+echo "✓ Installed systemd service"
+
+# Enable and start
+sudo systemctl enable --now chronoseal
+echo "✓ ChronoSeal service started"
+
+echo ""
+echo "✅ ChronoSeal installed successfully!"
+echo ""
+echo "Useful commands:"
+echo "  chronoseal status          # Check service status"
+echo "  chronoseal health          # Health probe"
+echo "  sudo systemctl status chronoseal"
+echo "  sudo journalctl -u chronoseal -f"
+echo ""
+echo "To uninstall: sudo systemctl disable --now chronoseal && sudo rm /usr/local/bin/chronoseal"

scripts/release.sh

@@ -1,5 +1,12 @@
 #!/bin/bash
-bash build.sh
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+"$ROOT/scripts/build.sh"
+
 echo "Release artifacts:"
-echo " - server/target/release/antibot-server"
+echo " - target/release/chronoseal"
 echo " - frontend/ (including pkg/)"
+echo " - chronoseal.service"
+echo " - scripts/install.sh"

server/Cargo.toml

@@ -1,17 +1,29 @@
 [package]
 name = "chronoseal-server"
-version = "0.2.0"
+version = "0.5.0"
 edition = "2021"
 
+[[bin]]
+name = "chronoseal"
+path = "src/main.rs"
+
 [dependencies]
 shared = { path = "../shared" }
 axum = "0.7"
+clap = { version = "4", features = ["derive", "env", "wrap_help"] }
+clap_complete = "4"
 tokio = { version = "1", features = ["full"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+serde_yaml = "0.9"
+toml = "0.8"
 rusqlite = { version = "0.31", features = ["bundled"] }
+r2d2 = "0.8"
+r2d2_sqlite = "0.24"
+thiserror = "2"
 tracing = "0.1"
-tracing-subscriber = "0.3"
+tracing-appender = "0.2"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
 tower = "0.4"
 tower-http = { version = "0.5", features = ["cors", "fs"] }
 hex = "0.4"

server/src/cleanup.rs

@@ -1,5 +1,5 @@
-use std::sync::Arc;
 use crate::session::AppState;
+use std::sync::Arc;
 
 pub async fn cleanup_loop(state: Arc<AppState>) {
     loop {
@@ -7,18 +7,22 @@ pub async fn cleanup_loop(state: Arc<AppState>) {
 
         // Evict expired sessions from SQLite.
         {
-            let db = state.db.lock().await;
-            let now = crate::storage::current_time_ms();
-            let _ = db.execute(
-                "DELETE FROM sessions WHERE expires_at < ?1",
-                rusqlite::params![now],
-            );
+            if let Ok(conn) = state.db_pool.get() {
+                let now = crate::storage::current_time_ms();
+                let _ = conn.execute(
+                    "DELETE FROM sessions WHERE expires_at < ?1",
+                    rusqlite::params![now],
+                );
+            } else {
+                tracing::error!("Failed to get database connection from pool for cleanup");
+            }
         }
 
         // Evict stale rate-limiter entries to prevent unbounded HashMap growth.
         {
+            let window_secs = state.get_config().rate_limit_window_secs;
             let mut rl = state.rate_limiter.lock().await;
-            rl.evict_stale();
+            rl.evict_stale(window_secs);
         }
     }
 }

server/src/cli.rs

@@ -0,0 +1,146 @@
+use clap::{Args, Parser, Subcommand, ValueEnum};
+use std::path::PathBuf;
+
+#[derive(Debug, Clone, Copy, ValueEnum)]
+pub enum OutputFormat {
+    Text,
+    Json,
+    Yaml,
+}
+
+#[derive(Debug, Parser)]
+#[command(
+    name = "chronoseal",
+    version,
+    about = "Linux-native cryptographic browser attestation service",
+    long_about = "ChronoSeal runs as a composable Unix service. The CLI is the source of truth for daemon operation, health checks, configuration validation, metrics, and shell integration.",
+    after_help = "Examples:\n  chronoseal\n  chronoseal run --bind 127.0.0.1:3000\n  chronoseal status --format json\n  chronoseal health --config /etc/chronoseal/config.toml\n  chronoseal config check --output yaml\n  chronoseal generate keypair\n  chronoseal completion bash > /etc/bash_completion.d/chronoseal\n\nConfiguration precedence:\n  CLI flags > CHRONOSEAL_* environment variables > config file > built-in defaults\n\nDefault config discovery:\n  /etc/chronoseal/config.toml, then $XDG_CONFIG_HOME/chronoseal/config.toml, then ~/.config/chronoseal/config.toml"
+)]
+pub struct Cli {
+    #[command(flatten)]
+    pub globals: GlobalArgs,
+
+    #[command(subcommand)]
+    pub command: Option<Command>,
+}
+
+#[derive(Debug, Clone, Args)]
+pub struct GlobalArgs {
+    /// Path to config file.
+    #[arg(long, env = "CHRONOSEAL_CONFIG", global = true)]
+    pub config: Option<PathBuf>,
+
+    /// Output format for machine-readable commands.
+    #[arg(long, short = 'f', value_enum, default_value = "text", global = true)]
+    pub format: OutputFormat,
+
+    /// Alias for --format, provided for Unix tool compatibility.
+    #[arg(long, value_enum, global = true)]
+    pub output: Option<OutputFormat>,
+
+    /// Override the logging filter, for example info, chronoseal=debug.
+    #[arg(long, env = "CHRONOSEAL_LOG", global = true)]
+    pub log: Option<String>,
+}
+
+impl GlobalArgs {
+    pub fn output_format(&self) -> OutputFormat {
+        self.output.unwrap_or(self.format)
+    }
+}
+
+#[derive(Debug, Subcommand)]
+pub enum Command {
+    /// Run the ChronoSeal daemon.
+    #[command(
+        after_help = "Examples:\n  chronoseal run\n  chronoseal run --bind 127.0.0.1:3000 --frontend-dir /srv/chronoseal/frontend\n  CHRONOSEAL_BIND=0.0.0.0:3000 chronoseal run"
+    )]
+    Run(RunArgs),
+
+    /// Report whether the configured daemon is reachable and which PID file is present.
+    #[command(
+        after_help = "Examples:\n  chronoseal status\n  chronoseal status --format json\n  chronoseal status --pid-file /run/chronoseal.pid"
+    )]
+    Status(RuntimeArgs),
+
+    /// Perform a daemon health probe.
+    #[command(
+        after_help = "Examples:\n  chronoseal health\n  chronoseal health --format json\n  chronoseal health --bind 127.0.0.1:3000"
+    )]
+    Health(RuntimeArgs),
+
+    /// Validate and print effective configuration.
+    #[command(subcommand)]
+    Config(ConfigCommand),
+
+    /// Generate operational material.
+    #[command(subcommand)]
+    Generate(GenerateCommand),
+
+    /// Print version and build information.
+    #[command(after_help = "Examples:\n  chronoseal version\n  chronoseal version --format json")]
+    Version,
+
+    /// Print Prometheus metrics from the running daemon.
+    #[command(
+        after_help = "Examples:\n  chronoseal metrics\n  chronoseal metrics --bind 127.0.0.1:3000"
+    )]
+    Metrics(RuntimeArgs),
+
+    /// Print service statistics from the running daemon.
+    #[command(after_help = "Examples:\n  chronoseal stats\n  chronoseal stats --format json")]
+    Stats(RuntimeArgs),
+
+    /// Generate shell completions.
+    #[command(
+        after_help = "Examples:\n  chronoseal completion bash\n  chronoseal completion zsh > ~/.zfunc/_chronoseal"
+    )]
+    Completion { shell: clap_complete::Shell },
+}
+
+#[derive(Debug, Clone, Args)]
+pub struct RunArgs {
+    #[command(flatten)]
+    pub runtime: RuntimeArgs,
+
+    /// SQLite database path. Use ':memory:' for ephemeral state.
+    #[arg(long, env = "CHRONOSEAL_DB_PATH")]
+    pub db_path: Option<PathBuf>,
+
+    /// Static frontend directory served at /.
+    #[arg(long, env = "CHRONOSEAL_FRONTEND_DIR")]
+    pub frontend_dir: Option<PathBuf>,
+
+    /// Optional structured JSON log file.
+    #[arg(long, env = "CHRONOSEAL_LOG_FILE")]
+    pub log_file: Option<PathBuf>,
+}
+
+#[derive(Debug, Clone, Args)]
+pub struct RuntimeArgs {
+    /// Socket address the daemon binds to, or that CLI probes connect to.
+    #[arg(long, env = "CHRONOSEAL_BIND")]
+    pub bind: Option<String>,
+
+    /// PID file path.
+    #[arg(long, env = "CHRONOSEAL_PID_FILE")]
+    pub pid_file: Option<PathBuf>,
+}
+
+#[derive(Debug, Subcommand)]
+pub enum ConfigCommand {
+    /// Validate configuration and print the effective values.
+    #[command(
+        after_help = "Examples:\n  chronoseal config check\n  chronoseal config check --config /etc/chronoseal/config.toml\n  chronoseal config check --output json"
+    )]
+    Check(RuntimeArgs),
+}
+
+#[derive(Debug, Subcommand)]
+pub enum GenerateCommand {
+    /// Generate an Ed25519 keypair as hex-encoded JSON/YAML/text.
+    #[command(
+        after_help = "Examples:\n  chronoseal generate keypair\n  chronoseal generate keypair --format json"
+    )]
+    Keypair,
+}

server/src/config.rs

@@ -0,0 +1,240 @@
+use crate::cli::{RunArgs, RuntimeArgs};
+use serde::{Deserialize, Serialize};
+use std::{
+    env, fs, io,
+    net::SocketAddr,
+    path::{Path, PathBuf},
+};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default, deny_unknown_fields)]
+pub struct Config {
+    pub bind: String,
+    pub pid_file: PathBuf,
+    pub db_path: PathBuf,
+    pub frontend_dir: PathBuf,
+    pub log_file: Option<PathBuf>,
+    pub heartbeat_min_interval_ms: u64,
+    pub heartbeat_max_interval_ms: u64,
+    pub expiration_minutes: i64,
+    pub rate_limit_count: u32,
+    pub rate_limit_window_secs: u64,
+    pub max_timestamp_drift_ms: i64,
+    pub min_mouse_total_dist: f64,
+    pub max_mouse_avg_speed: f64,
+    pub min_pause_count: u32,
+    pub require_mouse_activity: bool,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            bind: "0.0.0.0:3000".to_string(),
+            pid_file: PathBuf::from("/run/chronoseal.pid"),
+            db_path: default_state_dir().join("chronoseal.sqlite"),
+            frontend_dir: PathBuf::from("/usr/share/chronoseal/frontend"),
+            log_file: None,
+            heartbeat_min_interval_ms: 12_000,
+            heartbeat_max_interval_ms: 25_000,
+            expiration_minutes: 30,
+            rate_limit_count: 5,
+            rate_limit_window_secs: 10,
+            max_timestamp_drift_ms: 30_000,
+            min_mouse_total_dist: 10.0,
+            max_mouse_avg_speed: 2.0,
+            min_pause_count: 1,
+            require_mouse_activity: true,
+        }
+    }
+}
+
+impl Config {
+    pub fn load(config_path: Option<&Path>) -> Result<Self, ConfigError> {
+        let mut config = Self::default();
+
+        if let Some(path) = config_path
+            .map(Path::to_path_buf)
+            .or_else(discover_config_path)
+        {
+            let raw = fs::read_to_string(&path).map_err(|source| ConfigError::Read {
+                path: path.clone(),
+                source,
+            })?;
+            config = toml::from_str(&raw).map_err(|source| ConfigError::Parse {
+                path: path.clone(),
+                source,
+            })?;
+        }
+
+        config.apply_env();
+        config.validate()?;
+        Ok(config)
+    }
+
+    pub fn apply_runtime_args(&mut self, args: &RuntimeArgs) {
+        if let Some(bind) = &args.bind {
+            self.bind.clone_from(bind);
+        }
+        if let Some(pid_file) = &args.pid_file {
+            self.pid_file = pid_file.clone();
+        }
+    }
+
+    pub fn apply_run_args(&mut self, args: &RunArgs) {
+        self.apply_runtime_args(&args.runtime);
+        if let Some(db_path) = &args.db_path {
+            self.db_path = db_path.clone();
+        }
+        if let Some(frontend_dir) = &args.frontend_dir {
+            self.frontend_dir = frontend_dir.clone();
+        }
+        if let Some(log_file) = &args.log_file {
+            self.log_file = Some(log_file.clone());
+        }
+    }
+
+    pub fn validate(&self) -> Result<(), ConfigError> {
+        self.bind
+            .parse::<SocketAddr>()
+            .map_err(|source| ConfigError::InvalidBind {
+                bind: self.bind.clone(),
+                source,
+            })?;
+        Ok(())
+    }
+
+    fn apply_env(&mut self) {
+        if let Ok(value) = env::var("CHRONOSEAL_BIND") {
+            self.bind = value;
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_PID_FILE") {
+            self.pid_file = PathBuf::from(value);
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_DB_PATH") {
+            self.db_path = PathBuf::from(value);
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_FRONTEND_DIR") {
+            self.frontend_dir = PathBuf::from(value);
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_LOG_FILE") {
+            self.log_file = Some(PathBuf::from(value));
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_HEARTBEAT_MIN_INTERVAL_MS") {
+            if let Ok(val) = value.parse() {
+                self.heartbeat_min_interval_ms = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_HEARTBEAT_MAX_INTERVAL_MS") {
+            if let Ok(val) = value.parse() {
+                self.heartbeat_max_interval_ms = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_EXPIRATION_MINUTES") {
+            if let Ok(val) = value.parse() {
+                self.expiration_minutes = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_RATE_LIMIT_COUNT") {
+            if let Ok(val) = value.parse() {
+                self.rate_limit_count = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_RATE_LIMIT_WINDOW_SECS") {
+            if let Ok(val) = value.parse() {
+                self.rate_limit_window_secs = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_MAX_TIMESTAMP_DRIFT_MS") {
+            if let Ok(val) = value.parse() {
+                self.max_timestamp_drift_ms = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_MIN_MOUSE_TOTAL_DIST") {
+            if let Ok(val) = value.parse() {
+                self.min_mouse_total_dist = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_MAX_MOUSE_AVG_SPEED") {
+            if let Ok(val) = value.parse() {
+                self.max_mouse_avg_speed = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_MIN_PAUSE_COUNT") {
+            if let Ok(val) = value.parse() {
+                self.min_pause_count = val;
+            }
+        }
+        if let Ok(value) = env::var("CHRONOSEAL_REQUIRE_MOUSE_ACTIVITY") {
+            if let Ok(val) = value.parse() {
+                self.require_mouse_activity = val;
+            }
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum ConfigError {
+    Read {
+        path: PathBuf,
+        source: io::Error,
+    },
+    Parse {
+        path: PathBuf,
+        source: toml::de::Error,
+    },
+    InvalidBind {
+        bind: String,
+        source: std::net::AddrParseError,
+    },
+}
+
+impl std::fmt::Display for ConfigError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Read { path, source } => write!(f, "failed to read {}: {source}", path.display()),
+            Self::Parse { path, source } => {
+                write!(f, "failed to parse {} as TOML: {source}", path.display())
+            }
+            Self::InvalidBind { bind, source } => {
+                write!(f, "invalid bind address {bind}: {source}")
+            }
+        }
+    }
+}
+
+impl std::error::Error for ConfigError {}
+
+fn discover_config_path() -> Option<PathBuf> {
+    if let Ok(path) = env::var("CHRONOSEAL_CONFIG") {
+        let p = PathBuf::from(path);
+        if p.is_file() {
+            return Some(p);
+        }
+    }
+    user_config_candidates()
+        .into_iter()
+        .find(|candidate| candidate.is_file())
+}
+
+pub fn user_config_candidates() -> Vec<PathBuf> {
+    let mut candidates = vec![PathBuf::from("/etc/chronoseal/config.toml")];
+    if let Ok(xdg) = env::var("XDG_CONFIG_HOME") {
+        candidates.push(PathBuf::from(xdg).join("chronoseal/config.toml"));
+    } else if let Ok(home) = env::var("HOME") {
+        candidates.push(PathBuf::from(home).join(".config/chronoseal/config.toml"));
+    }
+    candidates
+}
+
+fn default_state_dir() -> PathBuf {
+    if let Ok(value) = env::var("CHRONOSEAL_STATE_DIR") {
+        return PathBuf::from(value);
+    }
+    if let Ok(value) = env::var("XDG_STATE_HOME") {
+        return PathBuf::from(value).join("chronoseal");
+    }
+    if let Ok(home) = env::var("HOME") {
+        return PathBuf::from(home).join(".local/state/chronoseal");
+    }
+    PathBuf::from("/var/lib/chronoseal")
+}

server/src/crypto.rs

@@ -6,9 +6,7 @@ pub fn verify_signature(
     pub_key_bytes: &[u8],
     req: &HeartbeatRequest,
 ) -> Result<(), Box<dyn std::error::Error>> {
-    let pk = VerifyingKey::from_bytes(
-        &pub_key_bytes.try_into().map_err(|_| "invalid pubkey")?,
-    )?;
+    let pk = VerifyingKey::from_bytes(&pub_key_bytes.try_into().map_err(|_| "invalid pubkey")?)?;
     let sig_bytes = hex::decode(&req.signature)?;
     let sig = Signature::from_slice(&sig_bytes)?;
 

server/src/errors.rs

@@ -0,0 +1,68 @@
+use axum::{
+    http::StatusCode,
+    response::{IntoResponse, Response},
+    Json,
+};
+use serde_json::json;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum SessionError {
+    #[error("Hex decoding error: {0}")]
+    Hex(#[from] hex::FromHexError),
+
+    #[error("Database error: {0}")]
+    Database(#[from] rusqlite::Error),
+
+    #[error("R2D2 pool error: {0}")]
+    Pool(#[from] r2d2::Error),
+
+    #[error("Invalid public key length")]
+    InvalidPublicKeyLength,
+}
+
+impl IntoResponse for SessionError {
+    fn into_response(self) -> Response {
+        let (status, error_message) = match self {
+            SessionError::InvalidPublicKeyLength => (StatusCode::BAD_REQUEST, self.to_string()),
+            _ => (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "Internal server error".to_string(),
+            ),
+        };
+        let body = Json(json!({
+            "error": error_message
+        }));
+        (status, body).into_response()
+    }
+}
+
+#[derive(Error, Debug)]
+pub enum VerificationError {
+    #[error("Session not found")]
+    SessionNotFound,
+
+    #[error("Database error: {0}")]
+    Database(#[from] rusqlite::Error),
+
+    #[error("Hex decoding error: {0}")]
+    Hex(#[from] hex::FromHexError),
+
+    #[error("Signature verification error: {0}")]
+    Signature(String),
+
+    #[error("Session has expired")]
+    Expired,
+
+    #[error("Chain is broken")]
+    ChainBroken,
+
+    #[error("Timestamp drift exceeded threshold")]
+    TimestampDrift,
+
+    #[error("Trust criteria failed: {0}")]
+    TrustFailed(String),
+
+    #[error("Fingerprint validation failed: {0}")]
+    FingerprintFailed(String),
+}

server/src/fingerprint.rs

@@ -2,9 +2,15 @@ use shared::protocol::Fingerprint;
 
 pub fn validate(fp: &Fingerprint) -> Result<(), Box<dyn std::error::Error>> {
     let ar: f64 = fp.aspect_ratio.parse().map_err(|_| "ar")?;
-    if ar < 0.5 || ar > 3.0 { return Err("aspect ratio".into()); }
+    if !(0.5..=3.0).contains(&ar) {
+        return Err("aspect ratio".into());
+    }
     let dpr: f64 = fp.device_pixel_ratio.parse().map_err(|_| "dpr")?;
-    if dpr <= 0.0 || dpr > 5.0 { return Err("dpr".into()); }
-    if fp.hardware_concurrency == 0 { return Err("hw".into()); }
+    if dpr <= 0.0 || dpr > 5.0 {
+        return Err("dpr".into());
+    }
+    if fp.hardware_concurrency == 0 {
+        return Err("hw".into());
+    }
     Ok(())
 }

server/src/main.rs

@@ -1,47 +1,147 @@
 mod cleanup;
+mod cli;
+mod config;
 mod crypto;
+mod errors;
 mod fingerprint;
 mod middleware;
+mod output;
 mod ratelimit;
 mod routes;
+mod runtime;
 mod session;
 mod storage;
 mod trust;
 mod vm;
 
-use axum::Router;
-use std::sync::Arc;
-use tokio::sync::Mutex;
-use tracing::info;
-
-use session::AppState;
+use clap::{CommandFactory, Parser};
+use cli::{Cli, Command, ConfigCommand, GenerateCommand};
+use config::Config;
+use std::path::PathBuf;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
 
 #[tokio::main]
 async fn main() {
-    tracing_subscriber::fmt::init();
+    if let Err(err) = try_main().await {
+        eprintln!("chronoseal: {err}");
+        std::process::exit(1);
+    }
+}
 
-    let conn = storage::init_db().expect("DB init");
-    let state = Arc::new(AppState {
-        db: Mutex::new(conn),
-        rate_limiter: Mutex::new(ratelimit::RateLimiter::new(
-            shared::constants::RATE_LIMIT_COUNT,
-            shared::constants::RATE_LIMIT_WINDOW_SECS,
-        )),
-    });
+async fn try_main() -> Result<(), Box<dyn std::error::Error>> {
+    let cli = Cli::parse();
+    if let Some(config_path) = cli.globals.config.as_deref() {
+        std::env::set_var("CHRONOSEAL_CONFIG", config_path);
+    }
+    let log_filter = cli.globals.log.as_deref().unwrap_or("info");
+    let log_file = log_file_for_command(&cli);
+    let _log_guard = init_logging(log_filter, log_file)?;
 
-    // Periodic cleanup
-    let bg_state = state.clone();
-    tokio::spawn(async move { cleanup::cleanup_loop(bg_state).await });
+    match &cli.command {
+        None | Some(Command::Run(_)) => {
+            let mut config = Config::load(cli.globals.config.as_deref())?;
+            if let Some(Command::Run(args)) = &cli.command {
+                config.apply_run_args(args);
+                config.validate()?;
+            }
+            runtime::run_daemon(config).await?;
+        }
+        Some(Command::Status(args)) => {
+            let mut config = Config::load(cli.globals.config.as_deref())?;
+            config.apply_runtime_args(args);
+            config.validate()?;
+            output::print(cli.globals.output_format(), &runtime::probe_status(&config))?;
+        }
+        Some(Command::Health(args)) => {
+            let mut config = Config::load(cli.globals.config.as_deref())?;
+            config.apply_runtime_args(args);
+            config.validate()?;
+            let report = runtime::probe_health(&config);
+            let healthy = report.status == "healthy";
+            output::print(cli.globals.output_format(), &report)?;
+            if !healthy {
+                std::process::exit(2);
+            }
+        }
+        Some(Command::Config(ConfigCommand::Check(args))) => {
+            let mut config = Config::load(cli.globals.config.as_deref())?;
+            config.apply_runtime_args(args);
+            config.validate()?;
+            output::print(cli.globals.output_format(), &config)?;
+        }
+        Some(Command::Generate(GenerateCommand::Keypair)) => {
+            output::print(cli.globals.output_format(), &runtime::generate_keypair())?;
+        }
+        Some(Command::Version) => {
+            output::print(cli.globals.output_format(), &runtime::version())?;
+        }
+        Some(Command::Metrics(args)) => {
+            let mut config = Config::load(cli.globals.config.as_deref())?;
+            config.apply_runtime_args(args);
+            config.validate()?;
+            print!("{}", runtime::fetch_metrics(&config)?);
+        }
+        Some(Command::Stats(args)) => {
+            let mut config = Config::load(cli.globals.config.as_deref())?;
+            config.apply_runtime_args(args);
+            config.validate()?;
+            output::print(cli.globals.output_format(), &runtime::fetch_stats(&config)?)?;
+        }
+        Some(Command::Completion { shell }) => {
+            let mut command = Cli::command();
+            let name = command.get_name().to_string();
+            clap_complete::generate(*shell, &mut command, name, &mut std::io::stdout());
+        }
+    }
+    Ok(())
+}
 
-    let app = Router::new()
-        .route("/init", axum::routing::post(routes::init::handler))
-        .route("/hb", axum::routing::post(routes::heartbeat::handler))
-        .nest_service("/", tower_http::services::ServeDir::new("../frontend"))
-        .layer(tower_http::cors::CorsLayer::permissive())
-        .layer(axum::middleware::from_fn(middleware::log_request))
-        .with_state(state);
+fn log_file_for_command(cli: &Cli) -> Option<PathBuf> {
+    match &cli.command {
+        None => Config::load(cli.globals.config.as_deref())
+            .ok()
+            .and_then(|config| config.log_file),
+        Some(Command::Run(args)) => {
+            let mut config = Config::load(cli.globals.config.as_deref()).ok()?;
+            config.apply_run_args(args);
+            config.log_file
+        }
+        _ => None,
+    }
+}
 
-    let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap();
-    info!("Server running on :3000");
-    axum::serve(listener, app).await.unwrap();
+fn init_logging(
+    filter: &str,
+    log_file: Option<PathBuf>,
+) -> Result<Option<tracing_appender::non_blocking::WorkerGuard>, Box<dyn std::error::Error>> {
+    let env_filter = EnvFilter::try_new(filter)?;
+    if let Some(path) = log_file {
+        if let Some(parent) = path.parent() {
+            std::fs::create_dir_all(parent)?;
+        }
+        let directory = path.parent().unwrap_or_else(|| std::path::Path::new("."));
+        let file_name = path
+            .file_name()
+            .and_then(|name| name.to_str())
+            .unwrap_or("chronoseal.jsonl");
+        let appender = tracing_appender::rolling::never(directory, file_name);
+        let (writer, guard) = tracing_appender::non_blocking(appender);
+        tracing_subscriber::registry()
+            .with(env_filter)
+            .with(tracing_subscriber::fmt::layer().with_target(false))
+            .with(
+                tracing_subscriber::fmt::layer()
+                    .json()
+                    .with_target(false)
+                    .with_writer(writer),
+            )
+            .init();
+        Ok(Some(guard))
+    } else {
+        tracing_subscriber::fmt()
+            .with_env_filter(env_filter)
+            .with_target(false)
+            .init();
+        Ok(None)
+    }
 }

server/src/output.rs

@@ -0,0 +1,18 @@
+use crate::cli::OutputFormat;
+use serde::Serialize;
+
+pub fn print<T>(format: OutputFormat, value: &T) -> Result<(), Box<dyn std::error::Error>>
+where
+    T: Serialize + TextOutput,
+{
+    match format {
+        OutputFormat::Text => println!("{}", value.to_text()),
+        OutputFormat::Json => println!("{}", serde_json::to_string_pretty(value)?),
+        OutputFormat::Yaml => print!("{}", serde_yaml::to_string(value)?),
+    }
+    Ok(())
+}
+
+pub trait TextOutput {
+    fn to_text(&self) -> String;
+}

server/src/ratelimit.rs

@@ -3,22 +3,22 @@ use std::time::Instant;
 
 pub struct RateLimiter {
     buckets: HashMap<String, (u32, Instant)>,
-    limit: u32,
-    window_secs: u64,
 }
 
 impl RateLimiter {
-    pub fn new(limit: u32, window_secs: u64) -> Self {
-        Self { buckets: HashMap::new(), limit, window_secs }
+    pub fn new() -> Self {
+        Self {
+            buckets: HashMap::new(),
+        }
     }
 
-    pub fn check(&mut self, key: &str) -> bool {
+    pub fn check(&mut self, key: &str, limit: u32, window_secs: u64) -> bool {
         let now = Instant::now();
         let entry = self.buckets.entry(key.to_string()).or_insert((0, now));
-        if now.duration_since(entry.1).as_secs() >= self.window_secs {
+        if now.duration_since(entry.1).as_secs() >= window_secs {
             *entry = (1, now);
             true
-        } else if entry.0 >= self.limit {
+        } else if entry.0 >= limit {
             false
         } else {
             entry.0 += 1;
@@ -28,10 +28,44 @@ impl RateLimiter {
 
     /// Remove entries whose rate-limit window has fully elapsed.
     /// Call this periodically (e.g. from the cleanup loop) to bound memory usage.
-    pub fn evict_stale(&mut self) {
-        let window = self.window_secs;
+    pub fn evict_stale(&mut self, window_secs: u64) {
         let now = Instant::now();
         self.buckets
-            .retain(|_, (_, ts)| now.duration_since(*ts).as_secs() < window);
+            .retain(|_, (_, ts)| now.duration_since(*ts).as_secs() < window_secs);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::thread;
+    use std::time::Duration;
+
+    #[test]
+    fn test_rate_limiter() {
+        let mut rl = RateLimiter::new();
+        // Limit of 2 requests per 1 second window
+        assert!(rl.check("user1", 2, 1));
+        assert!(rl.check("user1", 2, 1));
+        assert!(!rl.check("user1", 2, 1)); // 3rd fails
+
+        assert!(rl.check("user2", 2, 1)); // different key succeeds
+
+        thread::sleep(Duration::from_millis(1100));
+        assert!(rl.check("user1", 2, 1)); // succeeds after time window
+    }
+
+    #[test]
+    fn test_rate_limiter_eviction() {
+        let mut rl = RateLimiter::new();
+        assert!(rl.check("user1", 1, 1));
+        assert_eq!(rl.buckets.len(), 1);
+
+        rl.evict_stale(1);
+        assert_eq!(rl.buckets.len(), 1); // not stale yet
+
+        thread::sleep(Duration::from_millis(1100));
+        rl.evict_stale(1);
+        assert_eq!(rl.buckets.len(), 0); // evicted
     }
 }

server/src/routes/heartbeat.rs

@@ -1,7 +1,7 @@
-use axum::{extract::State, http::StatusCode, Json};
-use std::sync::Arc;
-use shared::protocol::{HeartbeatRequest, HeartbeatResponse};
 use crate::session::AppState;
+use axum::{extract::State, http::StatusCode, Json};
+use shared::protocol::{HeartbeatRequest, HeartbeatResponse};
+use std::sync::Arc;
 
 pub async fn handler(
     State(state): State<Arc<AppState>>,
@@ -9,22 +9,54 @@ pub async fn handler(
 ) -> (StatusCode, Json<HeartbeatResponse>) {
     // Rate limiting
     {
+        let (limit, window_secs) = {
+            let cfg = state.get_config();
+            (cfg.rate_limit_count, cfg.rate_limit_window_secs)
+        };
         let mut rl = state.rate_limiter.lock().await;
-        if !rl.check(&payload.session_id) {
+        if !rl.check(&payload.session_id, limit, window_secs) {
             tracing::debug!("Rate limit hit: {}", payload.session_id);
-            return (StatusCode::OK, Json(HeartbeatResponse { status: "ok".into(), next_salt: None }));
+            return (
+                StatusCode::OK,
+                Json(HeartbeatResponse {
+                    status: "ok".into(),
+                    next_salt: None,
+                }),
+            );
         }
     }
 
-    let db = state.db.lock().await;
-    match crate::session::verify_heartbeat(&db, &payload) {
+    let config = state.get_config();
+    let conn = match state.db_pool.get() {
+        Ok(c) => c,
+        Err(e) => {
+            tracing::error!("Db pool error: {}", e);
+            return (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(HeartbeatResponse {
+                    status: "error".into(),
+                    next_salt: None,
+                }),
+            );
+        }
+    };
+    match crate::session::verify_heartbeat(&conn, &config, &payload) {
         Ok(next_salt) => (
             StatusCode::OK,
-            Json(HeartbeatResponse { status: "ok".into(), next_salt: Some(next_salt) }),
+            Json(HeartbeatResponse {
+                status: "ok".into(),
+                next_salt: Some(next_salt),
+            }),
         ),
         Err(e) => {
             tracing::warn!("Heartbeat failed for {}: {}", payload.session_id, e);
-            (StatusCode::OK, Json(HeartbeatResponse { status: "ok".into(), next_salt: None }))
+            (
+                StatusCode::OK,
+                Json(HeartbeatResponse {
+                    status: "ok".into(),
+                    next_salt: None,
+                }),
+            )
         }
     }
 }

server/src/routes/init.rs

@@ -1,17 +1,15 @@
-use axum::{extract::State, http::StatusCode, Json};
-use std::sync::Arc;
-use shared::protocol::{InitRequest, InitResponse};
+use crate::errors::SessionError;
 use crate::session::AppState;
+use axum::{extract::State, Json};
+use shared::protocol::{InitRequest, InitResponse};
+use std::sync::Arc;
 
 pub async fn handler(
     State(state): State<Arc<AppState>>,
     Json(payload): Json<InitRequest>,
-) -> Result<Json<InitResponse>, (StatusCode, String)> {
-    let db = state.db.lock().await;
-    crate::session::create_session(&db, &payload.public_key)
-        .map(Json)
-        .map_err(|e| {
-            tracing::error!("Init error: {}", e);
-            (StatusCode::INTERNAL_SERVER_ERROR, "Internal".into())
-        })
+) -> Result<Json<InitResponse>, SessionError> {
+    let config = state.get_config();
+    let conn = state.db_pool.get()?;
+    let resp = crate::session::create_session(&conn, &config, &payload.public_key)?;
+    Ok(Json(resp))
 }

server/src/routes/mod.rs

@@ -1,2 +1,2 @@
-pub mod init;
 pub mod heartbeat;
+pub mod init;

server/src/runtime.rs

@@ -0,0 +1,341 @@
+use crate::{
+    config::Config,
+    output::TextOutput,
+    ratelimit::RateLimiter,
+    routes, session,
+    storage::{self, StoreStats},
+};
+use axum::{http::StatusCode, response::IntoResponse, routing::get, Json, Router};
+use serde::Serialize;
+use std::{
+    fs,
+    io::{Read, Write},
+    net::{SocketAddr, TcpStream},
+    path::Path,
+    sync::Arc,
+    time::Duration,
+};
+use tokio::sync::{Mutex, Notify};
+use tracing::{error, info, warn};
+
+#[derive(Debug, Serialize)]
+pub struct HealthReport {
+    pub status: &'static str,
+    pub bind: String,
+}
+
+impl TextOutput for HealthReport {
+    fn to_text(&self) -> String {
+        format!("{}\nbind={}", self.status, self.bind)
+    }
+}
+
+#[derive(Debug, Serialize)]
+pub struct StatusReport {
+    pub running: bool,
+    pub healthy: bool,
+    pub bind: String,
+    pub pid_file: String,
+    pub pid: Option<u32>,
+}
+
+impl TextOutput for StatusReport {
+    fn to_text(&self) -> String {
+        let pid = self
+            .pid
+            .map_or_else(|| "unknown".to_string(), |pid| pid.to_string());
+        format!(
+            "running={}\nhealthy={}\nbind={}\npid_file={}\npid={}",
+            self.running, self.healthy, self.bind, self.pid_file, pid
+        )
+    }
+}
+
+#[derive(Debug, Serialize)]
+pub struct VersionReport {
+    pub name: &'static str,
+    pub version: &'static str,
+    pub target: &'static str,
+}
+
+impl TextOutput for VersionReport {
+    fn to_text(&self) -> String {
+        format!("{} {}", self.name, self.version)
+    }
+}
+
+#[derive(Debug, Serialize)]
+pub struct KeypairReport {
+    pub algorithm: &'static str,
+    pub public_key_hex: String,
+    pub private_key_hex: String,
+}
+
+impl TextOutput for KeypairReport {
+    fn to_text(&self) -> String {
+        format!(
+            "algorithm={}\npublic_key_hex={}\nprivate_key_hex={}",
+            self.algorithm, self.public_key_hex, self.private_key_hex
+        )
+    }
+}
+
+impl TextOutput for Config {
+    fn to_text(&self) -> String {
+        format!(
+            "bind={}\npid_file={}\ndb_path={}\nfrontend_dir={}\nlog_file={}",
+            self.bind,
+            self.pid_file.display(),
+            self.db_path.display(),
+            self.frontend_dir.display(),
+            self.log_file
+                .as_ref()
+                .map(|path| path.display().to_string())
+                .unwrap_or_else(|| "none".to_string())
+        )
+    }
+}
+
+impl TextOutput for StoreStats {
+    fn to_text(&self) -> String {
+        format!(
+            "sessions={}\nexpired_sessions={}\nmax_chain_length={}",
+            self.sessions, self.expired_sessions, self.max_chain_length
+        )
+    }
+}
+
+pub async fn run_daemon(config: Config) -> Result<(), Box<dyn std::error::Error>> {
+    install_pid_file(&config.pid_file)?;
+
+    let db_pool = storage::init_pool(&config.db_path)?;
+    let state = Arc::new(session::AppState {
+        db_pool,
+        rate_limiter: Mutex::new(RateLimiter::new()),
+        config: std::sync::RwLock::new(config.clone()),
+    });
+
+    let bg_state = state.clone();
+    tokio::spawn(async move { crate::cleanup::cleanup_loop(bg_state).await });
+
+    let app = Router::new()
+        .route("/init", axum::routing::post(routes::init::handler))
+        .route("/hb", axum::routing::post(routes::heartbeat::handler))
+        .route("/health", get(health_handler))
+        .route("/metrics", get(metrics_handler))
+        .route("/stats", get(stats_handler))
+        .nest_service(
+            "/",
+            tower_http::services::ServeDir::new(&config.frontend_dir),
+        )
+        .layer(tower_http::cors::CorsLayer::permissive())
+        .layer(axum::middleware::from_fn(crate::middleware::log_request))
+        .with_state(state.clone());
+
+    let addr: SocketAddr = config.bind.parse()?;
+    let listener = tokio::net::TcpListener::bind(addr).await?;
+    info!(bind = %config.bind, "chronoseal daemon started");
+
+    let shutdown = signal_task(state.clone());
+    let result = axum::serve(listener, app)
+        .with_graceful_shutdown(shutdown)
+        .await;
+
+    remove_pid_file(&config.pid_file);
+    result?;
+    info!("chronoseal daemon stopped");
+    Ok(())
+}
+
+pub fn probe_health(config: &Config) -> HealthReport {
+    if http_get(&config.bind, "/health").is_ok() {
+        HealthReport {
+            status: "healthy",
+            bind: config.bind.clone(),
+        }
+    } else {
+        HealthReport {
+            status: "unreachable",
+            bind: config.bind.clone(),
+        }
+    }
+}
+
+pub fn probe_status(config: &Config) -> StatusReport {
+    let pid = read_pid(&config.pid_file);
+    let healthy = http_get(&config.bind, "/health").is_ok();
+    StatusReport {
+        running: pid.is_some() || healthy,
+        healthy,
+        bind: config.bind.clone(),
+        pid_file: config.pid_file.display().to_string(),
+        pid,
+    }
+}
+
+pub fn fetch_metrics(config: &Config) -> Result<String, Box<dyn std::error::Error>> {
+    http_get(&config.bind, "/metrics")
+}
+
+pub fn fetch_stats(config: &Config) -> Result<StoreStats, Box<dyn std::error::Error>> {
+    let body = http_get(&config.bind, "/stats")?;
+    Ok(serde_json::from_str(&body)?)
+}
+
+pub fn generate_keypair() -> KeypairReport {
+    let private_key = rand::random::<[u8; 32]>();
+    let signing_key = ed25519_dalek::SigningKey::from_bytes(&private_key);
+    let verifying_key = signing_key.verifying_key();
+    KeypairReport {
+        algorithm: "ed25519",
+        public_key_hex: hex::encode(verifying_key.to_bytes()),
+        private_key_hex: hex::encode(private_key),
+    }
+}
+
+pub fn version() -> VersionReport {
+    VersionReport {
+        name: "chronoseal",
+        version: env!("CARGO_PKG_VERSION"),
+        target: std::env::consts::ARCH,
+    }
+}
+
+async fn health_handler() -> impl IntoResponse {
+    (
+        StatusCode::OK,
+        Json(serde_json::json!({ "status": "healthy" })),
+    )
+}
+
+async fn stats_handler(
+    axum::extract::State(state): axum::extract::State<Arc<session::AppState>>,
+) -> Result<Json<StoreStats>, (StatusCode, String)> {
+    let db = state
+        .db_pool
+        .get()
+        .map_err(|err| (StatusCode::INTERNAL_SERVER_ERROR, err.to_string()))?;
+    storage::stats(&db)
+        .map(Json)
+        .map_err(|err| (StatusCode::INTERNAL_SERVER_ERROR, err.to_string()))
+}
+
+async fn metrics_handler(
+    axum::extract::State(state): axum::extract::State<Arc<session::AppState>>,
+) -> Result<String, (StatusCode, String)> {
+    let db = state
+        .db_pool
+        .get()
+        .map_err(|err| (StatusCode::INTERNAL_SERVER_ERROR, err.to_string()))?;
+    storage::stats(&db)
+        .map(|stats| {
+            format!(
+                "# HELP chronoseal_sessions Active ChronoSeal sessions\n# TYPE chronoseal_sessions gauge\nchronoseal_sessions {}\n# HELP chronoseal_expired_sessions Expired sessions not yet removed\n# TYPE chronoseal_expired_sessions gauge\nchronoseal_expired_sessions {}\n# HELP chronoseal_max_chain_length Maximum heartbeat chain length\n# TYPE chronoseal_max_chain_length gauge\nchronoseal_max_chain_length {}\n",
+                stats.sessions, stats.expired_sessions, stats.max_chain_length
+            )
+        })
+        .map_err(|err| (StatusCode::INTERNAL_SERVER_ERROR, err.to_string()))
+}
+
+async fn signal_task(state: Arc<session::AppState>) {
+    let shutdown = Arc::new(Notify::new());
+
+    #[cfg(unix)]
+    {
+        use tokio::signal::unix::{signal, SignalKind};
+
+        let shutdown_term = shutdown.clone();
+        tokio::spawn(async move {
+            let mut sigterm = signal(SignalKind::terminate()).expect("install SIGTERM handler");
+            sigterm.recv().await;
+            info!("received SIGTERM; shutting down gracefully");
+            shutdown_term.notify_one();
+        });
+
+        let shutdown_int = shutdown.clone();
+        tokio::spawn(async move {
+            if tokio::signal::ctrl_c().await.is_ok() {
+                info!("received interrupt; shutting down gracefully");
+                shutdown_int.notify_one();
+            }
+        });
+
+        let state_for_hup = state.clone();
+        tokio::spawn(async move {
+            let mut sighup = signal(SignalKind::hangup()).expect("install SIGHUP handler");
+            while sighup.recv().await.is_some() {
+                match Config::load(None) {
+                    Ok(reloaded) => {
+                        info!(
+                            bind = %reloaded.bind,
+                            db_path = %reloaded.db_path.display(),
+                            "received SIGHUP; configuration reloaded"
+                        );
+                        if let Ok(mut config_write) = state_for_hup.config.write() {
+                            *config_write = reloaded;
+                        }
+                    }
+                    Err(err) => warn!(error = %err, "received SIGHUP; configuration reload failed"),
+                }
+            }
+        });
+
+        tokio::spawn(async move {
+            let mut sigusr1 = signal(SignalKind::user_defined1()).expect("install SIGUSR1 handler");
+            while sigusr1.recv().await.is_some() {
+                info!("received SIGUSR1; stats are available via chronoseal stats or /stats");
+            }
+        });
+    }
+
+    #[cfg(not(unix))]
+    {
+        if tokio::signal::ctrl_c().await.is_ok() {
+            shutdown.notify_one();
+        }
+    }
+
+    shutdown.notified().await;
+}
+
+fn install_pid_file(path: &Path) -> Result<(), Box<dyn std::error::Error>> {
+    if let Some(parent) = path.parent() {
+        if let Err(err) = fs::create_dir_all(parent) {
+            warn!(path = %parent.display(), error = %err, "could not create PID directory");
+        }
+    }
+    match fs::write(path, std::process::id().to_string()) {
+        Ok(()) => Ok(()),
+        Err(err) => {
+            warn!(path = %path.display(), error = %err, "could not write PID file");
+            Ok(())
+        }
+    }
+}
+
+fn remove_pid_file(path: &Path) {
+    if let Err(err) = fs::remove_file(path) {
+        if err.kind() != std::io::ErrorKind::NotFound {
+            error!(path = %path.display(), error = %err, "could not remove PID file");
+        }
+    }
+}
+
+fn read_pid(path: &Path) -> Option<u32> {
+    fs::read_to_string(path).ok()?.trim().parse().ok()
+}
+
+fn http_get(bind: &str, path: &str) -> Result<String, Box<dyn std::error::Error>> {
+    let mut stream = TcpStream::connect_timeout(&bind.parse()?, Duration::from_secs(2))?;
+    stream.set_read_timeout(Some(Duration::from_secs(2)))?;
+    stream.write_all(
+        format!("GET {path} HTTP/1.1\r\nHost: chronoseal\r\nConnection: close\r\n\r\n").as_bytes(),
+    )?;
+
+    let mut response = String::new();
+    stream.read_to_string(&mut response)?;
+    let (_, body) = response
+        .split_once("\r\n\r\n")
+        .ok_or("daemon returned an invalid HTTP response")?;
+    Ok(body.to_string())
+}

server/src/session.rs

@@ -1,24 +1,36 @@
 pub struct AppState {
-    pub db: tokio::sync::Mutex<rusqlite::Connection>,
+    pub db_pool: crate::storage::DbPool,
     pub rate_limiter: tokio::sync::Mutex<crate::ratelimit::RateLimiter>,
+    pub config: std::sync::RwLock<crate::config::Config>,
 }
 
+impl AppState {
+    pub fn get_config(&self) -> crate::config::Config {
+        if let Ok(cfg) = self.config.read() {
+            cfg.clone()
+        } else {
+            crate::config::Config::default()
+        }
+    }
+}
+
+use crate::{crypto, fingerprint, storage, trust, vm};
 use rusqlite::params;
 use shared::protocol::{HeartbeatRequest, InitResponse};
-use crate::{crypto, trust, fingerprint, vm, storage};
 
 pub fn create_session(
     conn: &rusqlite::Connection,
+    config: &crate::config::Config,
     pub_key_hex: &str,
-) -> Result<InitResponse, Box<dyn std::error::Error>> {
+) -> Result<InitResponse, crate::errors::SessionError> {
     let pub_key = hex::decode(pub_key_hex)?;
     if pub_key.len() != shared::constants::SESSION_ID_LEN {
-        return Err("invalid pubkey len".into());
+        return Err(crate::errors::SessionError::InvalidPublicKeyLength);
     }
     let session_id = hex::encode(rand::random::<[u8; shared::constants::SESSION_ID_LEN]>());
     let salt = rand::random::<[u8; shared::constants::SALT_LEN]>();
     let now = storage::current_time_ms();
-    let expires_at = now + (shared::constants::EXPIRATION_MINUTES as u64) * 60 * 1000;
+    let expires_at = now + (config.expiration_minutes as u64) * 60 * 1000;
 
     let initial_hash = shared::hashing::initial_hash(&session_id, &pub_key, &salt);
 
@@ -37,43 +49,56 @@ pub fn create_session(
         opcodes_b64,
         initial_hash: hex::encode(&initial_hash),
         expires_at,
+        heartbeat_min_interval_ms: config.heartbeat_min_interval_ms,
+        heartbeat_max_interval_ms: config.heartbeat_max_interval_ms,
     })
 }
 
 pub fn verify_heartbeat(
     conn: &rusqlite::Connection,
+    config: &crate::config::Config,
     req: &HeartbeatRequest,
-) -> Result<String, Box<dyn std::error::Error>> {
+) -> Result<String, crate::errors::VerificationError> {
     let mut stmt = conn.prepare(
         "SELECT public_key, salt, last_hash, expires_at FROM sessions WHERE session_id = ?1",
     )?;
-    let (pub_key, salt, stored_last_hash, expires_at): (Vec<u8>, Vec<u8>, Vec<u8>, u64) =
-        stmt.query_row(params![req.session_id], |row| {
+    let (pub_key, salt, stored_last_hash, expires_at): (Vec<u8>, Vec<u8>, Vec<u8>, u64) = stmt
+        .query_row(params![req.session_id], |row| {
             Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?))
+        })
+        .map_err(|e| {
+            if matches!(e, rusqlite::Error::QueryReturnedNoRows) {
+                crate::errors::VerificationError::SessionNotFound
+            } else {
+                crate::errors::VerificationError::Database(e)
+            }
         })?;
 
     let now = storage::current_time_ms();
     if now > expires_at {
-        return Err("expired".into());
+        return Err(crate::errors::VerificationError::Expired);
     }
 
     // 1. Verify signature
-    crypto::verify_signature(&pub_key, req)?;
+    crypto::verify_signature(&pub_key, req)
+        .map_err(|e| crate::errors::VerificationError::Signature(e.to_string()))?;
 
     // 2. Check chain continuity
     if stored_last_hash != hex::decode(&req.prev_hash)? {
-        return Err("chain broken".into());
+        return Err(crate::errors::VerificationError::ChainBroken);
     }
 
     // 3. Time window
     let diff = (now as i64) - (req.timestamp as i64);
-    if diff.abs() > shared::constants::MAX_TIMESTAMP_DRIFT_MS {
-        return Err("timestamp drift".into());
+    if diff.abs() > config.max_timestamp_drift_ms {
+        return Err(crate::errors::VerificationError::TimestampDrift);
     }
 
     // 4. Trusted mouse & fingerprint
-    trust::validate_mouse(&req.entropy_data)?;
-    fingerprint::validate(&req.fingerprint)?;
+    trust::validate_mouse(&req.entropy_data, config)
+        .map_err(|e| crate::errors::VerificationError::TrustFailed(e.to_string()))?;
+    fingerprint::validate(&req.fingerprint)
+        .map_err(|e| crate::errors::VerificationError::FingerprintFailed(e.to_string()))?;
 
     // 5. Compute new hash
     let prev_hash_bytes = hex::decode(&req.prev_hash)?;
@@ -96,3 +121,104 @@ pub fn verify_heartbeat(
 
     Ok(next_salt_hex)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use ed25519_dalek::{Signer, SigningKey};
+    use shared::protocol::{EntropyData, Fingerprint, HeartbeatRequest, StackState};
+    use std::path::Path;
+
+    fn sign_request(sk: &SigningKey, req: &mut HeartbeatRequest) {
+        let mut payload: std::collections::BTreeMap<&str, serde_json::Value> =
+            std::collections::BTreeMap::new();
+        payload.insert(
+            "entropyData",
+            serde_json::to_value(&req.entropy_data).unwrap(),
+        );
+        payload.insert(
+            "fingerprint",
+            serde_json::to_value(&req.fingerprint).unwrap(),
+        );
+        payload.insert("prevHash", serde_json::json!(req.prev_hash));
+        payload.insert("sessionId", serde_json::json!(req.session_id));
+        payload.insert(
+            "stackState",
+            serde_json::to_value(&req.stack_state).unwrap(),
+        );
+        payload.insert("timestamp", serde_json::json!(req.timestamp));
+        let message = serde_json::to_string(&payload).unwrap();
+        let sig = sk.sign(message.as_bytes());
+        req.signature = hex::encode(sig.to_bytes());
+    }
+
+    #[test]
+    fn test_session_lifecycle_and_verification() {
+        let pool = storage::init_pool(Path::new(":memory:")).unwrap();
+        let conn = pool.get().unwrap();
+
+        let config = crate::config::Config {
+            expiration_minutes: 30,
+            max_timestamp_drift_ms: 30000,
+            min_mouse_total_dist: 10.0,
+            max_mouse_avg_speed: 2.0,
+            min_pause_count: 1,
+            require_mouse_activity: false, // simpler for tests
+            ..crate::config::Config::default()
+        };
+
+        // Generate Ed25519 keypair
+        let mut rng = rand::thread_rng();
+        let sk = SigningKey::generate(&mut rng);
+        let pk = sk.verifying_key();
+        let pub_key_hex = hex::encode(pk.to_bytes());
+
+        // 1. Create Session
+        let start_time = storage::current_time_ms();
+        let init_resp = create_session(&conn, &config, &pub_key_hex).unwrap();
+        assert!(init_resp.expires_at >= start_time + 30 * 60 * 1000);
+        assert!(init_resp.expires_at <= storage::current_time_ms() + 30 * 60 * 1000);
+
+        // Verify stats
+        let stats = storage::stats(&conn).unwrap();
+        assert_eq!(stats.sessions, 1);
+        assert_eq!(stats.expired_sessions, 0);
+
+        // 2. Heartbeat Verification
+        let now = storage::current_time_ms();
+        let entropy_data = EntropyData { events: vec![] };
+        let stack_state = StackState {
+            stack: vec![42],
+            ip: 5,
+        };
+        let fingerprint = Fingerprint {
+            aspect_ratio: "1.77".to_string(),
+            device_pixel_ratio: "2.0".to_string(),
+            hardware_concurrency: 8,
+        };
+
+        let mut req = HeartbeatRequest {
+            session_id: init_resp.session_id.clone(),
+            prev_hash: init_resp.initial_hash.clone(),
+            timestamp: now,
+            entropy_data,
+            stack_state,
+            fingerprint,
+            signature: "".to_string(),
+        };
+
+        sign_request(&sk, &mut req);
+
+        // Verify successful heartbeat
+        let next_salt = verify_heartbeat(&conn, &config, &req).unwrap();
+        assert!(!next_salt.is_empty());
+
+        // Try duplicate/broken hash chain (prev_hash unchanged but expected next hash in DB)
+        let res = verify_heartbeat(&conn, &config, &req);
+        assert!(res.is_err());
+        assert!(matches!(
+            res.unwrap_err(),
+            crate::errors::VerificationError::ChainBroken
+        ));
+    }
+}

server/src/storage.rs

@@ -1,8 +1,34 @@
 use rusqlite::Connection;
+use serde::{Deserialize, Serialize};
+use std::path::Path;
 use std::time::{SystemTime, UNIX_EPOCH};
 
-pub fn init_db() -> Result<Connection, rusqlite::Error> {
-    let conn = Connection::open_in_memory()?;
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct StoreStats {
+    pub sessions: u64,
+    pub expired_sessions: u64,
+    pub max_chain_length: u64,
+}
+
+pub type DbPool = r2d2::Pool<r2d2_sqlite::SqliteConnectionManager>;
+
+pub fn init_pool(path: &Path) -> Result<DbPool, Box<dyn std::error::Error>> {
+    let manager = if path == Path::new(":memory:") {
+        r2d2_sqlite::SqliteConnectionManager::memory()
+    } else {
+        if let Some(parent) = path.parent() {
+            let _ = std::fs::create_dir_all(parent);
+        }
+        r2d2_sqlite::SqliteConnectionManager::file(path)
+    };
+
+    let pool = r2d2::Pool::new(manager)?;
+    let conn = pool.get()?;
+    init_schema(&conn)?;
+    Ok(pool)
+}
+
+fn init_schema(conn: &rusqlite::Connection) -> Result<(), rusqlite::Error> {
     conn.execute_batch(
         "CREATE TABLE IF NOT EXISTS sessions (
             session_id TEXT PRIMARY KEY,
@@ -15,9 +41,32 @@ pub fn init_db() -> Result<Connection, rusqlite::Error> {
             expires_at INTEGER NOT NULL
         );",
     )?;
-    Ok(conn)
+    Ok(())
+}
+
+pub fn stats(conn: &Connection) -> Result<StoreStats, rusqlite::Error> {
+    let now = current_time_ms();
+    let sessions = conn.query_row("SELECT COUNT(*) FROM sessions", [], |row| row.get(0))?;
+    let expired_sessions = conn.query_row(
+        "SELECT COUNT(*) FROM sessions WHERE expires_at < ?1",
+        [now],
+        |row| row.get(0),
+    )?;
+    let max_chain_length = conn.query_row(
+        "SELECT COALESCE(MAX(chain_length), 0) FROM sessions",
+        [],
+        |row| row.get(0),
+    )?;
+    Ok(StoreStats {
+        sessions,
+        expired_sessions,
+        max_chain_length,
+    })
 }
 
 pub fn current_time_ms() -> u64 {
-    SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_millis() as u64
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_millis() as u64
 }

server/src/trust.rs

@@ -1,7 +1,14 @@
+use crate::config::Config;
 use shared::protocol::EntropyData;
 
-pub fn validate_mouse(data: &EntropyData) -> Result<(), Box<dyn std::error::Error>> {
+pub fn validate_mouse(
+    data: &EntropyData,
+    config: &Config,
+) -> Result<(), Box<dyn std::error::Error>> {
     let events = &data.events;
+    if !config.require_mouse_activity && events.is_empty() {
+        return Ok(());
+    }
     if events.len() < 3 {
         return Err("few events".into());
     }
@@ -19,18 +26,193 @@ pub fn validate_mouse(data: &EntropyData) -> Result<(), Box<dyn std::error::Erro
             pauses += 1;
         }
     }
-    if total_dist < shared::constants::MIN_MOUSE_TOTAL_DIST {
+    if total_dist < config.min_mouse_total_dist {
         return Err("insufficient distance".into());
     }
     // Speed in px/ms: total distance over elapsed wall-clock time of the event window.
-    let total_time_ms =
-        (events.last().unwrap().timestamp_ms - events[0].timestamp_ms).max(1.0);
+    let total_time_ms = (events.last().unwrap().timestamp_ms - events[0].timestamp_ms).max(1.0);
     let avg_speed = total_dist / total_time_ms;
-    if avg_speed > shared::constants::MAX_MOUSE_AVG_SPEED {
+    if avg_speed > config.max_mouse_avg_speed {
         return Err("speed too high".into());
     }
-    if pauses < shared::constants::MIN_PAUSE_COUNT {
+    if pauses < config.min_pause_count {
         return Err("no pause".into());
     }
     Ok(())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use shared::protocol::MouseEvent;
+
+    fn get_default_config() -> Config {
+        Config {
+            min_mouse_total_dist: 10.0,
+            max_mouse_avg_speed: 2.0,
+            min_pause_count: 1,
+            require_mouse_activity: true,
+            ..Config::default()
+        }
+    }
+
+    #[test]
+    fn test_validate_mouse_success() {
+        let config = get_default_config();
+        // Mouse moves from (0,0) to (5,0) then (15,0) with a pause
+        let events = vec![
+            MouseEvent {
+                x: 0.0,
+                y: 0.0,
+                timestamp_ms: 100.0,
+            },
+            MouseEvent {
+                x: 5.0,
+                y: 0.0,
+                timestamp_ms: 200.0,
+            },
+            // Pause here (dist = 0, time diff = 100ms > 50ms)
+            MouseEvent {
+                x: 5.0,
+                y: 0.0,
+                timestamp_ms: 300.0,
+            },
+            MouseEvent {
+                x: 15.0,
+                y: 0.0,
+                timestamp_ms: 400.0,
+            },
+        ];
+        let data = EntropyData { events };
+        assert!(validate_mouse(&data, &config).is_ok());
+    }
+
+    #[test]
+    fn test_validate_mouse_insufficient_events() {
+        let config = get_default_config();
+        let events = vec![
+            MouseEvent {
+                x: 0.0,
+                y: 0.0,
+                timestamp_ms: 100.0,
+            },
+            MouseEvent {
+                x: 5.0,
+                y: 0.0,
+                timestamp_ms: 200.0,
+            },
+        ];
+        let data = EntropyData { events };
+        let res = validate_mouse(&data, &config);
+        assert!(res.is_err());
+        assert_eq!(res.unwrap_err().to_string(), "few events");
+    }
+
+    #[test]
+    fn test_validate_mouse_insufficient_distance() {
+        let config = get_default_config();
+        // Total distance is only 5.0 < 10.0
+        let events = vec![
+            MouseEvent {
+                x: 0.0,
+                y: 0.0,
+                timestamp_ms: 100.0,
+            },
+            MouseEvent {
+                x: 2.0,
+                y: 0.0,
+                timestamp_ms: 200.0,
+            },
+            MouseEvent {
+                x: 2.0,
+                y: 0.0,
+                timestamp_ms: 300.0,
+            },
+            MouseEvent {
+                x: 5.0,
+                y: 0.0,
+                timestamp_ms: 400.0,
+            },
+        ];
+        let data = EntropyData { events };
+        let res = validate_mouse(&data, &config);
+        assert!(res.is_err());
+        assert_eq!(res.unwrap_err().to_string(), "insufficient distance");
+    }
+
+    #[test]
+    fn test_validate_mouse_too_fast() {
+        let config = get_default_config();
+        // Distance is 200.0, time difference is 70ms -> speed 2.85 > 2.0
+        let events = vec![
+            MouseEvent {
+                x: 0.0,
+                y: 0.0,
+                timestamp_ms: 100.0,
+            },
+            MouseEvent {
+                x: 100.0,
+                y: 0.0,
+                timestamp_ms: 105.0,
+            },
+            MouseEvent {
+                x: 100.0,
+                y: 0.0,
+                timestamp_ms: 165.0,
+            }, // pause
+            MouseEvent {
+                x: 200.0,
+                y: 0.0,
+                timestamp_ms: 170.0,
+            },
+        ];
+        let data = EntropyData { events };
+        let res = validate_mouse(&data, &config);
+        assert!(res.is_err());
+        assert_eq!(res.unwrap_err().to_string(), "speed too high");
+    }
+
+    #[test]
+    fn test_validate_mouse_no_pauses() {
+        let config = get_default_config();
+        // Constant movement without any pause
+        let events = vec![
+            MouseEvent {
+                x: 0.0,
+                y: 0.0,
+                timestamp_ms: 100.0,
+            },
+            MouseEvent {
+                x: 5.0,
+                y: 0.0,
+                timestamp_ms: 200.0,
+            },
+            MouseEvent {
+                x: 10.0,
+                y: 0.0,
+                timestamp_ms: 300.0,
+            },
+            MouseEvent {
+                x: 15.0,
+                y: 0.0,
+                timestamp_ms: 400.0,
+            },
+        ];
+        let data = EntropyData { events };
+        let res = validate_mouse(&data, &config);
+        assert!(res.is_err());
+        assert_eq!(res.unwrap_err().to_string(), "no pause");
+    }
+
+    #[test]
+    fn test_validate_mouse_require_activity_toggle() {
+        let mut config = get_default_config();
+        config.require_mouse_activity = false;
+
+        let data = EntropyData { events: vec![] };
+        assert!(validate_mouse(&data, &config).is_ok());
+
+        config.require_mouse_activity = true;
+        assert!(validate_mouse(&data, &config).is_err());
+    }
+}

shared/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "shared"
-version = "0.2.0"
+version = "0.5.0"
 edition = "2021"
 
 [dependencies]

shared/src/constants.rs

@@ -1,11 +1,2 @@
 pub const SESSION_ID_LEN: usize = 32;
 pub const SALT_LEN: usize = 16;
-pub const HEARTBEAT_MIN_INTERVAL_MS: u64 = 12_000;
-pub const HEARTBEAT_MAX_INTERVAL_MS: u64 = 25_000;
-pub const EXPIRATION_MINUTES: i64 = 30;
-pub const RATE_LIMIT_COUNT: u32 = 5;
-pub const RATE_LIMIT_WINDOW_SECS: u64 = 10;
-pub const MAX_TIMESTAMP_DRIFT_MS: i64 = 30_000;
-pub const MIN_MOUSE_TOTAL_DIST: f64 = 10.0;
-pub const MAX_MOUSE_AVG_SPEED: f64 = 2.0; // px/ms
-pub const MIN_PAUSE_COUNT: u32 = 1;

shared/src/hashing.rs

@@ -1,5 +1,5 @@
-use blake3::Hasher;
 use crate::protocol::{EntropyData, StackState};
+use blake3::Hasher;
 
 /// Initial hash for a brand-new session: Blake3(session_id || pub_key || salt)
 pub fn initial_hash(session_id: &str, pub_key: &[u8], salt: &[u8]) -> Vec<u8> {

shared/src/protocol.rs

@@ -12,6 +12,8 @@ pub struct InitResponse {
     pub opcodes_b64: String,
     pub initial_hash: String,
     pub expires_at: u64,
+    pub heartbeat_min_interval_ms: u64,
+    pub heartbeat_max_interval_ms: u64,
 }
 
 #[derive(Deserialize, Serialize)]

wasm/Cargo.toml

@@ -1,10 +1,10 @@
 [package]
 name = "chronoseal-wasm"
-version = "0.2.0"
+version = "0.5.0"
 edition = "2021"
 
 [lib]
-crate-type = ["cdylib"]
+crate-type = ["cdylib", "rlib"]
 
 [dependencies]
 shared = { path = "../shared" }

wasm/src/crypto.rs

@@ -3,7 +3,7 @@ use std::cell::RefCell;
 use wasm_bindgen::prelude::*;
 
 thread_local! {
-    static KEYPAIR: RefCell<Option<SigningKey>> = RefCell::new(None);
+    static KEYPAIR: RefCell<Option<SigningKey>> = const { RefCell::new(None) };
 }
 
 #[wasm_bindgen]
@@ -51,10 +51,8 @@ pub fn compute_next_hash(
 ) -> String {
     let prev = hex::decode(prev_hash_hex).unwrap_or_default();
     let salt = hex::decode(salt_hex).unwrap_or_default();
-    let entropy =
-        serde_json::from_str::<shared::protocol::EntropyData>(entropy_data_json).unwrap();
-    let stack =
-        serde_json::from_str::<shared::protocol::StackState>(stack_state_json).unwrap();
+    let entropy = serde_json::from_str::<shared::protocol::EntropyData>(entropy_data_json).unwrap();
+    let stack = serde_json::from_str::<shared::protocol::StackState>(stack_state_json).unwrap();
     let new = shared::hashing::next_chain_hash(&prev, timestamp, &entropy, &stack, &salt);
     hex::encode(new)
 }

wasm/src/vm.rs

@@ -1,10 +1,12 @@
-use wasm_bindgen::prelude::*;
 use shared::protocol::StackState;
+use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen]
 pub fn run_program(program_b64: &str) -> JsValue {
     use base64::Engine;
-    let bytes = base64::engine::general_purpose::STANDARD.decode(program_b64).unwrap();
+    let bytes = base64::engine::general_purpose::STANDARD
+        .decode(program_b64)
+        .unwrap();
     let state = execute(&bytes);
     serde_wasm_bindgen::to_value(&state).unwrap()
 }
@@ -17,13 +19,22 @@ fn execute(program: &[u8]) -> StackState {
         ip += 1;
         match op {
             0x00 => {
-                if ip + 4 > program.len() { break; }
-                let val = u32::from_le_bytes([program[ip], program[ip+1], program[ip+2], program[ip+3]]);
+                if ip + 4 > program.len() {
+                    break;
+                }
+                let val = u32::from_le_bytes([
+                    program[ip],
+                    program[ip + 1],
+                    program[ip + 2],
+                    program[ip + 3],
+                ]);
                 ip += 4;
                 stack.push(val);
             }
             0x01..=0x07 => {
-                if stack.len() < 2 { break; }
+                if stack.len() < 2 {
+                    break;
+                }
                 let b = stack.pop().unwrap();
                 let a = stack.pop().unwrap();
                 let r = match op {
@@ -39,7 +50,9 @@ fn execute(program: &[u8]) -> StackState {
                 stack.push(r);
             }
             0x08 => {
-                if stack.is_empty() { break; }
+                if stack.is_empty() {
+                    break;
+                }
                 let a = stack.pop().unwrap();
                 stack.push(!a);
             }
@@ -51,5 +64,140 @@ fn execute(program: &[u8]) -> StackState {
             _ => break,
         }
     }
-    StackState { stack, ip: ip as u16 }
+    StackState {
+        stack,
+        ip: ip as u16,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_push() {
+        // PUSH 42, PUSH 100
+        let program = vec![0x00, 42, 0, 0, 0, 0x00, 100, 0, 0, 0];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![42, 100]);
+        assert_eq!(state.ip, 10);
+    }
+
+    #[test]
+    fn test_add() {
+        // PUSH 5, PUSH 10, ADD
+        let program = vec![0x00, 5, 0, 0, 0, 0x00, 10, 0, 0, 0, 0x01];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![15]);
+    }
+
+    #[test]
+    fn test_add_wrapping() {
+        // PUSH u32::MAX, PUSH 1, ADD
+        let program = vec![0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 1, 0, 0, 0, 0x01];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![0]);
+    }
+
+    #[test]
+    fn test_sub() {
+        // PUSH 20, PUSH 7, SUB
+        let program = vec![0x00, 20, 0, 0, 0, 0x00, 7, 0, 0, 0, 0x02];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![13]);
+    }
+
+    #[test]
+    fn test_sub_wrapping() {
+        // PUSH 0, PUSH 1, SUB
+        let program = vec![0x00, 0, 0, 0, 0, 0x00, 1, 0, 0, 0, 0x02];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![u32::MAX]);
+    }
+
+    #[test]
+    fn test_mul() {
+        // PUSH 6, PUSH 7, MUL
+        let program = vec![0x00, 6, 0, 0, 0, 0x00, 7, 0, 0, 0, 0x03];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![42]);
+    }
+
+    #[test]
+    fn test_xor() {
+        // PUSH 0b1010, PUSH 0b1100, XOR
+        let program = vec![0x00, 0b1010, 0, 0, 0, 0x00, 0b1100, 0, 0, 0, 0x04];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![0b0110]);
+    }
+
+    #[test]
+    fn test_and() {
+        // PUSH 0b1010, PUSH 0b1100, AND
+        let program = vec![0x00, 0b1010, 0, 0, 0, 0x00, 0b1100, 0, 0, 0, 0x05];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![0b1000]);
+    }
+
+    #[test]
+    fn test_or() {
+        // PUSH 0b1010, PUSH 0b1100, OR
+        let program = vec![0x00, 0b1010, 0, 0, 0, 0x00, 0b1100, 0, 0, 0, 0x06];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![0b1110]);
+    }
+
+    #[test]
+    fn test_rot() {
+        // PUSH 1, PUSH 4, ROT
+        let program = vec![0x00, 1, 0, 0, 0, 0x00, 4, 0, 0, 0, 0x07];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![16]);
+    }
+
+    #[test]
+    fn test_not() {
+        // PUSH 0, NOT
+        let program = vec![0x00, 0, 0, 0, 0, 0x08];
+        let state = execute(&program);
+        assert_eq!(state.stack, vec![u32::MAX]);
+    }
+
+    #[test]
+    fn test_hash() {
+        // PUSH 10, PUSH 20, HASH
+        let program = vec![0x00, 10, 0, 0, 0, 0x00, 20, 0, 0, 0, 0x09];
+        let state = execute(&program);
+        assert_eq!(state.stack.len(), 1);
+        let expected_hash = shared::hashing::hash_stack(&[10, 20]);
+        assert_eq!(state.stack[0], expected_hash);
+    }
+
+    #[test]
+    fn test_underflow_binary() {
+        // PUSH 42, ADD (needs 2 values, only 1 on stack)
+        let program = vec![0x00, 42, 0, 0, 0, 0x01];
+        let state = execute(&program);
+        // ADD breaks when stack.len() < 2, stack has 42 left, ip is at the opcode ADD (6)
+        assert_eq!(state.stack, vec![42]);
+        assert_eq!(state.ip, 6);
+    }
+
+    #[test]
+    fn test_underflow_unary() {
+        // NOT (needs 1 value, empty stack)
+        let program = vec![0x08];
+        let state = execute(&program);
+        assert_eq!(state.stack, Vec::<u32>::new());
+        assert_eq!(state.ip, 1);
+    }
+
+    #[test]
+    fn test_incomplete_push() {
+        // PUSH opcode, but only 2 bytes instead of 4
+        let program = vec![0x00, 42, 0];
+        let state = execute(&program);
+        assert_eq!(state.stack, Vec::<u32>::new());
+        assert_eq!(state.ip, 1); // execution stopped at op 0x00 because ip + 4 > program.len()
+    }
 }