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 0xf94e72261b5da17815db0f832f295fba2fca2ad9d58564dcc12ae8a9fc83a6c8. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/620e641d-8757-46f6-8e01-febd3c8b4ac8.json and https://artists.proofprofile.net/proofs/artist/620e641d-8757-46f6-8e01-febd3c8b4ac8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
15 Grande Exitos Muy Mexicano y Son Arribeno, Vol. 2
15 Exitos de Hoy y Siempre (Edicion 30 Aniversario)