PiQrypt MCP Server

Cryptographic Audit Trail for AI Agents via Model Context Protocol

🚀 What is PiQrypt MCP?

PiQrypt MCP Server provides Model Context Protocol access to PiQrypt — the post-quantum cryptographic audit trail for AI agents.

Use cases:

• 🤖 AI Agents: Sign every decision with cryptographic proof
• 📊 n8n Workflows: Add audit trail to automation workflows
• 🏦 Trading Bots: SEC/FINRA compliance for automated trading
• 👥 HR Automation: GDPR-compliant AI hiring decisions
• 🏥 Healthcare AI: HIPAA audit trail for medical decisions

📦 Installation

Prerequisites

• Node.js 18+
• Python 3.8+
• PiQrypt Core (pip install piqrypt)

Install via npx (recommended)

npx @piqrypt/mcp-server

No build step required.

Install globally

npm install -g @piqrypt/mcp-server

Build from source

git clone https://github.com/piqrypt/piqrypt-mcp-server
cd piqrypt-mcp-server
npm install
npm run build

⚙️ Configuration

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "piqrypt": {
      "command": "piqrypt-mcp-server",
      "args": []
    }
  }
}

n8n (v1.88+)

1. Install n8n MCP integration
2. Add PiQrypt MCP server to configuration
3. Use in workflows via MCP node

Compatible with

MCP clients

Automation platforms (via MCP node)

What you can audit with PiQrypt MCP

Every tool call goes through the same 4 operations — stamp, verify, export, search. Here is what that means in practice depending on your context:

Automated trading / finance Any agent that submits orders, rebalances portfolios, or triggers transactions can stamp each decision before execution. The signed chain is exportable for SEC/FINRA audit without any additional infrastructure.

HR and hiring automation Any workflow that evaluates candidates, scores CVs, or routes applicants can stamp each decision. Provides a GDPR Art.22 compliant audit trail for AI-assisted hiring — who decided what, when, and what data was used (hashed, never stored raw).

Content and publishing pipelines Any agent that drafts, approves, or publishes content can stamp each step. Useful when multiple AI agents collaborate and you need to prove attribution — which agent wrote what, in what order.

DevOps and CI/CD Any agent that triggers deployments, merges branches, or rotates secrets can stamp each action. Provides a tamper-evident record of infrastructure changes made by autonomous agents.

Healthcare and medical AI Any diagnostic or triage agent can stamp each recommendation. Provides a HIPAA-compliant audit trail linking each AI output to a verifiable agent identity.

The common pattern in all cases:

[Agent makes decision]
↓
piqrypt_stamp_event    ← sign + chain
↓
[Agent executes action]
↓
piqrypt_export_audit   ← portable proof, verifiable
                          without PiQrypt installed

🛠️ Available Tools

1. piqrypt_stamp_event

Sign an AI decision with cryptographic proof.

Parameters:

• agent_id (string, required): Agent identifier
• payload (object, required): Decision data
• previous_hash (string, optional): Previous event hash for chaining

Example:

const event = await mcp.call('piqrypt_stamp_event', {
  agent_id: 'trading_bot_v1',
  payload: {
    action: 'buy',
    symbol: 'AAPL',
    quantity: 100,
    price: 150.25
  }
});

Returns:

{
  "version": "AISS-1.0",
  "agent_id": "trading_bot_v1",
  "timestamp": 1739382400,
  "nonce": "uuid-...",
  "payload": { ... },
  "previous_hash": "sha256:...",
  "signature": "base64:..."
}

2. piqrypt_verify_chain

Verify integrity of event chain.

Parameters:

• events (array, required): Events to verify

Example:

const result = await mcp.call('piqrypt_verify_chain', {
  events: [event1, event2, event3]
});

Returns:

{
  "valid": true,
  "events_count": 3,
  "chain_hash": "sha256:...",
  "errors": []
}

3. piqrypt_export_audit

Export audit trail for compliance.

Parameters:

• agent_id (string, required): Agent to export
• certified (boolean): Request PiQrypt certification
• output_format (string): json or pqz

Example:

const audit = await mcp.call('piqrypt_export_audit', {
  agent_id: 'trading_bot_v1',
  certified: true,
  output_format: 'json'
});

4. piqrypt_search_events

Fast search via SQLite index.

Parameters:

• event_type (string, optional): Filter by type
• from_timestamp (number, optional): Start time
• to_timestamp (number, optional): End time
• limit (number): Max results (default: 100)

Example:

const trades = await mcp.call('piqrypt_search_events', {
  event_type: 'trade_executed',
  from_timestamp: 1739300000,
  limit: 50
});

📊 Visualize your audit trail (free)

Every stamped event is visible in Vigil — PiQrypt's local monitoring dashboard.

pip install piqrypt
piqrypt start --tier free
# → http://localhost:8421

Free tier includes: chain health, VRS risk score, 7-day history, CRITICAL alerts. Upgrade to Pro for 90-day history, TrustGate governance, and post-quantum signatures.

🔒 Security Model

Process Isolation

┌─────────────────────────────────────┐
│  MCP Client (any MCP-compatible client)     │
│  ↓ JSON-RPC over stdio              │
├─────────────────────────────────────┤
│  MCP Server (TypeScript/Node.js)    │  ← No crypto here
│  ↓ subprocess call                  │
├─────────────────────────────────────┤
│  Python Bridge (bridge.py)          │
│  ↓ invokes CLI                      │
├─────────────────────────────────────┤
│  PiQrypt CLI (Python)               │
│  ↓ uses                             │
├─────────────────────────────────────┤
│  Core Crypto (aiss package)         │  ← All crypto here
│  • Ed25519 / Dilithium3             │
│  • RFC 8785 canonical JSON          │
│  • Hash chains                      │
└─────────────────────────────────────┘

Guarantees

✅ Private keys never exposed to MCP layer
✅ All crypto in Python (Ed25519, Dilithium3)
✅ Same security as CLI (process isolation)
✅ RFC AISS-1.1 compliant (identical output)
✅ Input validation before subprocess call

📚 Examples

Trading Bot (n8n)

[Webhook: price alert] 
    ↓
[AI Decision: buy/sell?]
    ↓
[PiQrypt MCP: stamp decision]  ← Audit trail
    ↓
[Execute trade API]
    ↓
[Database: store proof]

HR Automation

[Upload CV]
    ↓
[AI Agent: evaluate candidate]
    ↓
[PiQrypt MCP: stamp evaluation]  ← GDPR compliance
    ↓
[Email HR team]

🧪 Testing

# Build
npm run build

# Test bridge
python3 src/python/bridge.py stamp '{"agent_id":"test","payload":{"action":"test"}}'

# Test MCP server (manual)
node dist/index.js
# Then send MCP request via stdin

📖 Documentation

• MCP Setup Guide
• Tools Reference
• n8n Integration
• Security Model
• RFC Compliance

🤝 Contributing

We welcome contributions! See CONTRIBUTING.md.

📄 License

MCP Server → MIT License - see LICENSE PiQrypt Core → free tier + commercial tiers

🔗 Links

• PiQrypt Core: https://github.com/piqrypt/piqrypt
• MCP Protocol: https://modelcontextprotocol.io
• n8n: https://n8n.io
• Documentation: https://docs.piqrypt.com

Built with ❤️ by PiQrypt Inc.