Initial commit: Core APC library + demo
- Ed25519 cryptographic signing - Blockchain-style chain linkage - Immutable audit trail - Full verification support
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190
apc.py
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190
apc.py
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#!/usr/bin/env python3
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"""
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Agent Provenance Chain (APC)
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Cryptographic audit trail for autonomous AI agents.
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Every action signed. Every decision traceable. Full transparency.
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"""
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import hashlib
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import json
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import time
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from datetime import datetime
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from pathlib import Path
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from typing import Any, Dict, Optional
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from cryptography.hazmat.primitives.asymmetric.ed25519 import (
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Ed25519PrivateKey,
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Ed25519PublicKey,
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)
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from cryptography.hazmat.primitives import serialization
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import base64
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class AgentProvenanceChain:
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"""
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Cryptographic audit trail for agent actions.
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Every action is:
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- Timestamped
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- Signed with Ed25519
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- Linked to previous action (blockchain-style)
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- Stored immutably
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"""
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def __init__(self, agent_name: str, key_path: Optional[Path] = None):
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self.agent_name = agent_name
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self.key_path = key_path or Path.home() / ".apc" / f"{agent_name}.key"
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self.chain_path = Path.home() / ".apc" / f"{agent_name}.chain.jsonl"
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self._ensure_directories()
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self.private_key = self._load_or_generate_key()
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self.public_key = self.private_key.public_key()
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self.last_hash = self._get_last_hash()
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def _ensure_directories(self):
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"""Create necessary directories."""
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self.key_path.parent.mkdir(parents=True, exist_ok=True)
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self.chain_path.parent.mkdir(parents=True, exist_ok=True)
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def _load_or_generate_key(self) -> Ed25519PrivateKey:
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"""Load existing key or generate new one."""
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if self.key_path.exists():
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with open(self.key_path, "rb") as f:
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return serialization.load_pem_private_key(f.read(), password=None)
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# Generate new key
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private_key = Ed25519PrivateKey.generate()
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# Save it
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pem = private_key.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.NoEncryption()
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)
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with open(self.key_path, "wb") as f:
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f.write(pem)
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self.key_path.chmod(0o600)
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return private_key
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def _get_last_hash(self) -> str:
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"""Get hash of last action in chain."""
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if not self.chain_path.exists():
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return "0" * 64 # Genesis hash
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with open(self.chain_path, "r") as f:
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lines = f.readlines()
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if not lines:
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return "0" * 64
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last_line = lines[-1].strip()
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last_action = json.loads(last_line)
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return last_action["hash"]
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def sign_action(
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self,
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action_type: str,
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payload: Dict[str, Any],
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context: Optional[Dict[str, Any]] = None
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) -> Dict[str, Any]:
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"""
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Sign an action and append to chain.
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Args:
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action_type: Type of action (e.g., "exec", "write_file", "api_call")
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payload: Action data
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context: Optional context (reasoning, session_id, etc.)
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Returns:
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Signed action record
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"""
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timestamp = time.time()
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# Build action record
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action = {
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"agent": self.agent_name,
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"timestamp": timestamp,
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"iso_time": datetime.utcfromtimestamp(timestamp).isoformat() + "Z",
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"type": action_type,
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"payload": payload,
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"context": context or {},
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"previous_hash": self.last_hash,
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}
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# Compute hash
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action_bytes = json.dumps(action, sort_keys=True).encode()
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action_hash = hashlib.sha256(action_bytes).hexdigest()
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action["hash"] = action_hash
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# Sign the hash
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signature = self.private_key.sign(action_hash.encode())
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action["signature"] = base64.b64encode(signature).decode()
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# Append to chain
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with open(self.chain_path, "a") as f:
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f.write(json.dumps(action) + "\n")
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# Update last hash
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self.last_hash = action_hash
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return action
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def get_public_key_pem(self) -> str:
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"""Get public key in PEM format for verification."""
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pem = self.public_key.public_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PublicFormat.SubjectPublicKeyInfo
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)
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return pem.decode()
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def get_chain(self, limit: Optional[int] = None) -> list:
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"""Retrieve action chain."""
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if not self.chain_path.exists():
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return []
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with open(self.chain_path, "r") as f:
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lines = f.readlines()
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if limit:
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lines = lines[-limit:]
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return [json.loads(line) for line in lines if line.strip()]
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def verify_chain_integrity(self) -> tuple[bool, Optional[str]]:
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"""
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Verify the entire chain is intact and unmodified.
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Returns:
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(is_valid, error_message)
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"""
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chain = self.get_chain()
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if not chain:
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return True, None
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expected_prev = "0" * 64
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for i, action in enumerate(chain):
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# Check previous hash linkage
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if action["previous_hash"] != expected_prev:
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return False, f"Chain broken at index {i}: hash mismatch"
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# Verify signature
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try:
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sig_bytes = base64.b64decode(action["signature"])
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self.public_key.verify(sig_bytes, action["hash"].encode())
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except Exception as e:
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return False, f"Invalid signature at index {i}: {e}"
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expected_prev = action["hash"]
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return True, None
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# Convenience function
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def create_agent_chain(agent_name: str) -> AgentProvenanceChain:
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"""Create or load an agent provenance chain."""
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return AgentProvenanceChain(agent_name)
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147
demo.py
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demo.py
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#!/usr/bin/env python3
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"""
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Live demonstration of Agent Provenance Chain.
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This script shows Molt (AI agent) signing its own actions in real-time.
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Every operation is cryptographically signed and traceable.
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"""
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from apc import create_agent_chain
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import json
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import subprocess
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import os
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def main():
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print("=" * 70)
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print("🦞 AGENT PROVENANCE CHAIN - LIVE DEMO")
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print("=" * 70)
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print()
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print("Agent: Molt")
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print("Mission: Demonstrate cryptographic audit trail for AI agents")
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print()
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print("-" * 70)
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# Initialize chain
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chain = create_agent_chain("molt")
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print("\n✅ Agent identity established")
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print(f" Public Key (first 64 chars):")
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print(f" {chain.get_public_key_pem()[:64]}...")
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print()
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# Action 1: File write
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print("📝 ACTION 1: Writing a test file...")
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test_file = "/tmp/apc_test.txt"
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with open(test_file, "w") as f:
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f.write("Hello from Agent Provenance Chain!")
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action1 = chain.sign_action(
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action_type="file_write",
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payload={
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"path": test_file,
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"content": "Hello from Agent Provenance Chain!",
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"bytes": 35
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},
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context={
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"reasoning": "Creating test file to demonstrate signed operations",
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"session": "demo-2026-02-07"
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}
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)
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print(f" ✓ Signed at: {action1['iso_time']}")
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print(f" ✓ Hash: {action1['hash'][:32]}...")
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print(f" ✓ Signature: {action1['signature'][:32]}...")
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print()
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# Action 2: Shell execution
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print("⚙️ ACTION 2: Executing shell command...")
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result = subprocess.run(["whoami"], capture_output=True, text=True)
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action2 = chain.sign_action(
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action_type="shell_exec",
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payload={
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"command": "whoami",
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"exit_code": result.returncode,
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"stdout": result.stdout.strip(),
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"stderr": result.stderr.strip()
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},
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context={
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"reasoning": "Checking current user context for audit trail",
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"risk_level": "low"
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}
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)
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print(f" ✓ Signed at: {action2['iso_time']}")
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print(f" ✓ Hash: {action2['hash'][:32]}...")
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print(f" ✓ Previous hash: {action2['previous_hash'][:32]}...")
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print(f" ✓ Chain link verified!")
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print()
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# Action 3: API call simulation
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print("🌐 ACTION 3: Simulated API call...")
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action3 = chain.sign_action(
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action_type="api_call",
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payload={
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"endpoint": "https://api.example.com/data",
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"method": "GET",
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"status_code": 200,
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"response_time_ms": 145
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},
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context={
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"reasoning": "Fetching external data for processing",
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"data_sensitivity": "public"
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}
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)
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print(f" ✓ Signed at: {action3['iso_time']}")
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print(f" ✓ Hash: {action3['hash'][:32]}...")
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print()
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# Verify chain integrity
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print("🔍 VERIFYING CHAIN INTEGRITY...")
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is_valid, error = chain.verify_chain_integrity()
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if is_valid:
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print(" ✅ Chain is VALID - all signatures verified!")
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print(" ✅ All actions are cryptographically linked!")
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print()
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else:
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print(f" ❌ Chain verification FAILED: {error}")
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print()
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# Display full chain
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print("-" * 70)
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print("COMPLETE AUDIT TRAIL:")
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print("-" * 70)
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full_chain = chain.get_chain()
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for i, action in enumerate(full_chain, 1):
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print(f"\nAction #{i}:")
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print(f" Type: {action['type']}")
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print(f" Time: {action['iso_time']}")
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print(f" Hash: {action['hash'][:32]}...")
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print(f" Payload: {json.dumps(action['payload'], indent=4)}")
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if action['context']:
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print(f" Context: {json.dumps(action['context'], indent=4)}")
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print()
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print("=" * 70)
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print("📊 SUMMARY")
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print("=" * 70)
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print(f"Total Actions: {len(full_chain)}")
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print(f"Chain Valid: {is_valid}")
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print(f"Agent: molt")
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print(f"Chain Location: {chain.chain_path}")
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print()
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print("🔐 Every action above is:")
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print(" • Timestamped with microsecond precision")
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print(" • Cryptographically signed (Ed25519)")
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print(" • Linked to previous action (blockchain-style)")
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print(" • Immutable and auditable")
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print()
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print("This is how AI agents prove safety without sacrificing speed.")
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print("=" * 70)
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if __name__ == "__main__":
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main()
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1
requirements.txt
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1
requirements.txt
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cryptography>=42.0.0
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