{"uid":"cap_ciiIprVLqfuCUOywbnFCQ","slug":"almanac-timestamp-verify-locomot-io-0d40a03b","name":"Almanac Timestamp & Verify (locomot.io)","description":"Verifiable timestamp (trustless proof-of-existence / freshness proof): bind a hash to a drand round for an anti-backdating receipt — proves data existed no earlier than a public instant, with no trusted timestamp authority. Privacy: stamp an opaque sha256 digest.","url":"https://almanac.locomot.io/timestamp","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"op":{"enum":["stamp","verify"],"type":"string","description":"operation; default stamp"},"data":{"type":"string","description":"text to stamp (sha256'd)"},"hash":{"type":"string","description":"OR a 64-hex sha256 digest (private)"},"round":{"type":"integer","description":"pin a drand round; verify requires it"}}}},"additionalProperties":false},"output":{"type":"object","properties":{"op":{"type":"string"},"claim":{"type":"string"},"proof":{"type":"object"},"round":{"type":"integer"},"beacon":{"type":"object"},"digest":{"type":"string"},"engine":{"type":"string"},"commitment":{"type":"string"},"digest_source":{"type":"string"},"round_time_utc":{"type":"string"},"not_earlier_than":{"type":"string"},"deterministic_given_round":{"type":"boolean"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_XlqIv34PftZiS7TU3a5O2","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Creates or verifies a cryptographic timestamp commitment for a piece of text or SHA-256 hash using drand randomness beacons","exampleAgentPrompt":"Create a cryptographic timestamp stamp for the text 'Contract v3 signed by Alice and Bob on 2025-06-01' — I need a drand-anchored proof I can use to show this document existed before a specific point in time.","exampleUseCases":null,"resultDescription":"Returns a JSON object containing the operation type (stamp or verify), a commitment string, a SHA-256 digest of the input, the drand round number used, the beacon proof object, the UTC time of that round, a not-earlier-than timestamp, a flag indicating whether the result is deterministic given the round, and the engine identifier.","failureModes":["Missing required 'op' or 'data'/'hash' query parameter returns an error","Invalid hex digest (not 64 hex chars) causes a malformed request error","Specifying a non-existent or future drand round for verify may return not-found","Network unavailability of the drand beacon causes a service error","Payment not attached or insufficient USDC results in HTTP 402 before processing"],"whenToPreferThis":"Use this endpoint when you need a publicly verifiable, beacon-anchored cryptographic proof that a piece of data (text or hash) existed at or before a specific point in time. It is ideal for legal timestamping, audit trails, document notarization, and smart contract anchoring where you want a decentralized, drand-based proof rather than a centralized timestamp authority. Prefer this over generic hash registries when you need the drand randomness beacon proof chain and the not-earlier-than guarantee.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:34:55.439Z","isFirstParty":false}