{"uid":"cap_P86pw3jRRbHO7HOlQXeaH","slug":"aotrust-time-attestation-c0cc364b","name":"AOTrust Time Attestation","description":"Signed time attestation: timestamp bound to a payload hash, anchored in the cumulative Merkle log","url":"https://api.aotrust.link/v1/attest/time?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"payload_hash":{"type":"string","pattern":"^[0-9a-f]{64}$","description":"sha256 hex of the payload"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_aGOJMQqw3NyTQ88YL5kzM","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Creates a cryptographically signed timestamp bound to a SHA-256 payload hash, anchored in a cumulative Merkle log for tamper-evident proof of existence at a point in time.","exampleAgentPrompt":"I need a signed time attestation anchoring this SHA-256 hash to the AOTrust Merkle log to prove it existed right now: a3f1c2d4e5b6789012345678901234567890abcdef1234567890abcdef123456.","exampleUseCases":[{"title":"Legal document existence proof","prompt":"I need to prove that this contract existed before we signed it — can you create a signed timestamp attestation in AOTrust for this SHA-256 hash: b94f3e21a0dc456789abcdef0123456789abcdef0123456789abcdef01234567?"},{"title":"Software release integrity anchor","prompt":"We're releasing version 2.4.0 of our software tonight — please anchor this build artifact hash c0ffee1234567890abcdef1234567890abcdef1234567890abcdef1234567890 in AOTrust so we have a tamper-evident record of when it was published."},{"title":"Research data timestamping","prompt":"I need to timestamp my dataset hash before submitting to the journal — create an AOTrust Merkle-anchored time attestation for hash deadbeef1234567890abcdef1234567890abcdef1234567890abcdef12345678."}],"resultDescription":"A signed time attestation object containing the timestamp bound to the submitted payload hash, a cryptographic signature, and an anchor reference in AOTrust's cumulative Merkle log — enabling third-party verification that the hash existed at that moment in time.","failureModes":["Invalid payload_hash format (not 64 lowercase hex characters) — returns 400 validation error","Payment failure or insufficient USDC balance — returns 402 Payment Required","Rate limiting or quota exceeded — returns 429 Too Many Requests","Merkle log anchor service temporarily unavailable — returns 503","Duplicate hash submission may return the same or a new attestation depending on policy"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, low-cost cryptographic proof that a specific payload hash existed at a known point in time, anchored in a verifiable Merkle log. Prefer it over blockchain-based timestamping when you want fast, cheap attestation without full on-chain transaction overhead, and when you plan to retrieve a full evidence bundle (PDR + inclusion proof) later via the sibling AOTrust Evidence Bundle endpoint.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T06:42:24.047Z","isFirstParty":false,"canonicalSlug":"aotrust-time-attestation-c0cc364b"}