thumb|right | Celia Cruz in Havana, 1957 "Quimbara" is a song performed by Cuban recording artist Celia Cruz and Dominican recording artist Johnny Pacheco. The song, written by 20 year old Junior Cep
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 0xf89ddd8a7a645c9bf6eb1ea3887fe2a6b9e9761b9c284fab59a34bd1c82bad33. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6de4952-39ab-4340-bebd-b9b17b0a4c25.json and https://artists.proofprofile.net/proofs/artist/e6de4952-39ab-4340-bebd-b9b17b0a4c25.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).