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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe4b7ba5e8c96d340db29df02cc7fb8a3c4a714821d63a06c90decbb82a7004. 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/f8492831-34bf-4dc8-89ac-be7324dfab64.json and https://artists.proofprofile.net/proofs/artist/f8492831-34bf-4dc8-89ac-be7324dfab64.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Caccini / Miniscalchi / Radesca / Strozzi: Madrigals and Songs
La Semaine Mystique: Chants de devotion du regne de Louis XIII
L'Astree: Musiques d'apres le roman d'Honore d'Urfe
Délire des lyres: Chant au luth et à la viole