{"name":"Agent Proof Standard","version":"1.0","description":"Open format for certifying AI agent actions with cryptographic accountability","license":"CC0 1.0 Universal (Public Domain)","endpoints":{"validate":"POST /api/standard/validate — Free format validation (no auth)","anchor":"POST /api/standard/anchor — Blockchain anchoring (API key or x402)","spec":"GET /api/standard/spec — This specification"},"proof_format":{"required":["version","agent_id","instruction_hash","action_hash","timestamp","signature"],"optional":["action_type","post_id","target_author","session_id","chain_anchor","metadata"]},"signature_scheme":{"canonical":"version|agent_id|instruction_hash|action_hash|timestamp","algorithms":["Ed25519","ECDSA (secp256k1)"],"format":"hex:<hex-encoded-signature>"},"hash_format":"sha256:<64-hex-chars>","trust_integration":"Proofs anchored via this standard contribute to xProof trust scores"}