{"uid":"cap_LlpKvcKW6dN08GKPsBjLo","slug":"sellat-qualified-timestamp-issue-eidas-proof-1428abd3","name":"Sellat Qualified Timestamp – Issue eIDAS Proof","description":"Prueba de existencia para tus archivos: demuestra que ya existían, con sello de tiempo cualificado y presunción legal en toda la UE.","url":"https://sellat.app/api/v2/proofs/%7Bid%7D/qualified?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object"},"type":{"type":"string","const":"http"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"pathParams":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","additionalProperties":{"type":"string"}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"verify":"openssl ts -verify -in <file>.tsr -data <file> (any RFC 3161 tool); the .tsr is downloaded with the wallet’s key","created":true,"payment":{"charged":true,"amount_usd":"0.9","transaction":"<tx hash on Base>"},"proof_id":"<proof_id>","qualified":{"time":"<RFC 3161 time, UTC>","state":"issued","tsr_url":"https://sellat.app/api/v2/proofs/<id>/qualified.tsr","authority":"<EU qualified trust service provider>","policy_oid":"0.4.0.2023.1.1","serial_number":"<token serial>"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.9","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.9/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.9","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.9","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Yc0ytX2Ffq9PmFwgXjf6p","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.9","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Issues an EU eIDAS-qualified RFC 3161 electronic timestamp (.tsr) on a Sellat proof, legally demonstrating a file's existence at a specific point in time across the EU.","exampleAgentPrompt":"I need an EU eIDAS-qualified timestamp for my Sellat proof — can you issue a qualified RFC 3161 .tsr certificate for proof ID abc123 so I have legal proof of when this file existed?","exampleUseCases":[{"title":"IP protection before patent filing","prompt":"I'm about to file a patent and I need to prove my invention existed before today — can you issue a Sellat qualified eIDAS timestamp for proof ID proof_7f3a92 so I have legally recognized evidence of its existence across the EU?"},{"title":"Contract existence certification","prompt":"We signed a contract and I need an EU-legally-recognized timestamp proving it existed on today's date — please get a qualified RFC 3161 .tsr timestamp from Sellat for proof ID proof_44b810."},{"title":"Software release audit trail","prompt":"Before we push this release to production, I need a tamper-proof EU qualified timestamp certifying the exact moment this build existed — can you call Sellat and issue a qualified timestamp for proof ID proof_9c1de5?"}],"resultDescription":"Returns a JSON object confirming the qualified timestamp was issued, including: the RFC 3161 UTC time, a URL to download the .tsr file, the issuing EU qualified trust service authority name, the policy OID (0.4.0.2023.1.1), the serial number, and the on-chain payment transaction hash on Base. The .tsr can be verified with any RFC 3161 tool (e.g. openssl ts -verify).","failureModes":["Invalid or non-existent proof_id returns an error","Payment of 0.9 USDC not processed or wallet insufficient funds causes failure","Qualified TSP (Trust Service Provider) temporarily unavailable","Proof already has a qualified timestamp issued (duplicate request)","Malformed request body causes 400 error"],"whenToPreferThis":"Choose this endpoint when you need a legally recognized, EU eIDAS-qualified electronic timestamp — not just a blockchain hash. It's the right choice for regulatory compliance, legal proceedings, IP protection, or any scenario requiring a timestamp with legal presumption across EU member states. Prefer it over plain blockchain timestamping when eIDAS legal weight or RFC 3161 standard compatibility is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T12:32:51.616Z","isFirstParty":false,"canonicalSlug":"sellat-qualified-timestamp-issue-eidas-proof-1428abd3"}