{"machine":"notary","slot":"A9","title":"Notary - signed timestamped receipts","how_to_call":"POST https://innernetcorp.com/machines/notary with Content-Type: application/json","price_usd":"$0.003","currencies":["USDC","EURC"],"payment":"x402: send the POST without payment to receive a 402 with signed requirements; pay any option and retry.","input_example":{"data":"order #4512 shipped to Ada","note":"shipping-confirmation"},"input_schema":{"type":"object","properties":{"data":{"type":"string","description":"The content to notarize (<=1MB). Provide data OR hash."},"hash":{"type":"string","description":"sha256 hex of the content, if you prefer not to send it."},"note":{"type":"string","maxLength":256,"description":"Optional label baked into the signed receipt."}},"additionalProperties":false},"summary":"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.","catalog":"/catalog"}