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 0x30123da9744c5ab67df653a75ac2fa4a6e7dbb84c29264c2e4ae3b69ea1efeab. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a90dbcb1-eb56-41d7-b5fc-bacd8438ee48.json and https://artists.proofprofile.net/proofs/artist/a90dbcb1-eb56-41d7-b5fc-bacd8438ee48.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vintage Flamenco Cante Nº48 - EPs Collectors "Canto A Manolete"
Vintage Flamenco Cante Nº29 - EPs Collectors
Vintage Spanish Song Nº62 - EPs Collectors "Sevillanas De La Cava"