Urbina is a Basque (Spanish) surname. Notable people with the surname include: Abraham Alvarenga Urbina (born 1974), Honduran lawyer and politician Carlo Urbina (16th century), Italian painter, activ
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77813c10b2bc78cd0f797a4f519896c1e04907eeb31fcd4642cd616f083381b9. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbb3886b-2eec-4b1f-aa20-2f0e1fad4fe2.json and https://artists.proofprofile.net/proofs/artist/fbb3886b-2eec-4b1f-aa20-2f0e1fad4fe2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.