{"uid":"cap_Tw9Z4URuRm43qaZoaVqui","slug":"exhibit402-certificate-re-verification-79daef9b","name":"Exhibit402 Certificate Re-Verification","description":"Re-verify any exhibit402 proof-of-publication certificate for $0.02. Pass id = ERC-721 token id, Arweave tx id, or job id. The service re-downloads the permanently stored screenshot and signed manifest, recomputes every SHA-256, and checks them against the manifest and the on-chain record (immutable screenshotSha256, tokenURI, owner). Returns a machine-readable verdict with per-check detail, so an agent can confirm a certificate is genuine without trusting the issuer.","url":"https://exhibit402.dylan-caponi.workers.dev/verify","method":"GET","headers":{},"bodySchema":{"type":"object","$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"],"type":"string"},"queryParams":{"type":"object","required":["id"],"properties":{"id":{"type":"string","description":"Certificate identifier: ERC-721 token id (digits), Arweave tx id (43 chars), or exhibit402 job id (uuid)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"url":{"type":"string"},"note":{"type":"string"},"tier":{"type":"string"},"checks":{"type":"array"},"token_id":{"type":"string"},"verified":{"type":"boolean"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_VpamdnyYcpGi_5nt9vnVG","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Re-verifies an exhibit402 proof-of-publication certificate by recomputing SHA-256 hashes and checking them against on-chain ERC-721 records, returning a machine-readable verdict with per-check detail.","exampleAgentPrompt":"Can you re-verify the exhibit402 proof-of-publication certificate for token id 42 and tell me if all the SHA-256 checks pass and the on-chain record matches?","exampleUseCases":[{"title":"Legal evidence authenticity check","prompt":"I need to confirm this exhibit402 certificate is genuine before submitting it as evidence — the token id is 187. Can you re-verify it, recompute all the hashes, and tell me if every check passes?"},{"title":"NFT buyer due diligence","prompt":"Before I buy this exhibit402 NFT, can you verify token id 553 is authentic and that the screenshot stored on Arweave actually matches what's on-chain?"},{"title":"Audit trail for published content","prompt":"We archived a website snapshot last month and got job id a3f2c1d4-89ab-4cde-bfea-123456789abc. Can you re-verify the certificate now to confirm the screenshot and manifest haven't been tampered with?"}],"resultDescription":"A JSON object with a boolean 'verified' field indicating overall certificate validity, a 'checks' array containing per-check details (hash recomputation results, tokenURI match, owner confirmation), plus metadata fields including token_id, url, tier, and a human-readable note.","failureModes":["Invalid or non-existent id returns an error or unverified verdict","Arweave network unavailability causes re-download failure","On-chain record mismatch results in verified: false with failing check details","Malformed id format (not digits, 43-char Arweave tx, or UUID) triggers input validation error","Payment failure (x402 protocol) blocks the request before processing"],"whenToPreferThis":"Use this endpoint when you need to independently validate an exhibit402 proof-of-publication certificate without trusting the original issuer — ideal for legal, compliance, or due-diligence workflows where tamper-evidence and cryptographic auditability of a screenshot record matter. Prefer this over manual inspection when you need a machine-readable verdict with granular per-check detail across hash recomputation, Arweave storage, and ERC-721 on-chain anchoring.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:35:10.896Z","isFirstParty":false}