Notary - signed timestamped receipts. Proof for the agent economy: submit content (or just its sha256) and receive an Ed25519-signed, timestamped receipt proving that exact content existed at that moment. Nothing is stored - we hash and sign. Verification is FREE for anyone, forever, at POST /machines/verify-receipt (or offline with the embedded public key). Tool receipts, not zero-knowledge: the trust primitive agents actually use.

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