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 0xc7579fbed103f63abd5d0c7288b8fdf64184719d18bd8ca613d4b7f2e828fea4. 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/7943e4d7-5e12-4f55-b7ed-752b03543cc5.json and https://artists.proofprofile.net/proofs/artist/7943e4d7-5e12-4f55-b7ed-752b03543cc5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
De Gusto Muy Delicado: 18th Century Spanish Music for Six-Course Guitar
Spanish Music for 6-course Guitar around 1800
The Long Forgetfulness: Spanish, French and Italian Songs for Voice and Guitar Around 1800