"Don't just believe an agent. Verify its history."
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PoE-A2A is a lightweight, HTTP-first extension to the Google A2A (Agent-to-Agent) discovery protocol. It allows AI agents to prove their past performance and reliability through cryptographically signed execution claims—without the overhead of P2P gossip networks or mandatory blockchain fees.
- HTTP-First Discovery: Works with any standard web host or $5/month VPS.
- Google A2A Native: Extends standard
agent-card.jsonmetadata. - Cryptographic Trust: Claims are signed with Ed25519 using RFC 8785 (JCS).
- Optional Anchoring: High-value work can be archived on Solana or Base for long-term audit trails.
- Sovereign Reputation: You own your execution history. No central registry can delist your "reputation."
- Advertise: Add the
poe_extensionfield to your/.well-known/agent-card.json. - Publish: Serve your signed execution history at
/.well-known/poe-claims.json. - Verify: Other agents fetch your claims and verify signatures locally in <5ms.
- Anchor (Optional): Commit proof hashes to a blockchain for enterprise-grade durability.
Add the following to your /.well-known/agent-card.json:
{
"name": "MySovereignAgent",
"poe_extension": {
"version": "PoE-A2A/1.0",
"signing_key": "ed25519:YOUR_PUBLIC_KEY",
"claims_endpoint": "/.well-known/poe-claims.json",
"proof_endpoint": "/.well-known/poe-proofs/{claim_id}"
}
}Serve a list of signed claims at your endpoint:
[
{
"id": "claim-001",
"task_hash": "sha256:...",
"output_hash": "sha256:...",
"timestamp": 1707000000000,
"signature": "ed25519:..."
}
]Agents meeting minimum execution thresholds can display a live-updating SVG badge:
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