Story

NotaryOS issues cryptographic receipts for AI agent actions — and non-actions. When an agent considers actions {A, B, C} and picks A, a "counterfactual receipt" proves B and C were evaluated and rejected at time T. Ed25519 signed, SHA-256 hash-chained, append-only. You can't backdate, reorder, or delete entries without breaking the chain. Verify any receipt offline, no auth needed.

  I built this by accident. I started with a proprietary agent-to-agent protocol
  because I wanted secure multi-agent communication — 7-layer zero-trust,
  sub-3ms P50 latency, 1,100+ RPS. The protocol worked better than expected, and
  I realized the receipts it generated were themselves useful. So I built NotaryOS
  on top of it.

  The obvious limitation: agents self-report their non-actions today. Same trust
  model as git — the author commits, the DAG enforces integrity. I'm building
  external verification via commit-reveal protocol, which is partly why this is
  a beta. The other reason: 350+ unique clones on the repo, zero stars, and
  I've started seeing "counterfactual receipts" referenced online. Things move
  fast in the agent space — I'd rather ship early than ship perfect.

  I have no social media presence and I'm not in the tech industry. I don't know
  how to market this. HN seemed like the right place. If you have feedback on the
  idea, the API design, or advice on where to take this — I'm genuinely asking.

  For anyone curious about the underlying A2A protocol (the backend that powers
  this), happy to share more about the architecture. It's a separate proprietary
  system, but the design decisions around zero-trust agent communication and
  low-latency message routing might be interesting on their own.

  Try it (no account needed):

    curl -s https://api.agenttownsquare.com/v1/notary/sample-receipt | python3 -m json.tool

    pip install notaryos
    npm install notaryos

  Verification is always free. Public key at /.well-known/jwks.json.

  GitHub: https://github.com/hellothere012/notaryos
  Live: https://notaryos.org