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 0xa2139d6a0126a7877070cd0ac92e0c8bd90a30a6de658d2a2f7bf3752728877c. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f46c7062-10f9-498c-b1ae-7c86d4bdb0d8.json and https://artists.proofprofile.net/proofs/artist/f46c7062-10f9-498c-b1ae-7c86d4bdb0d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dutilleux: Sonate pour piano - Ohana: Sonatine monodique & 3 Caprices (Mono Version)
Fauré & Ravel: Trios pour piano, violon et violoncelle (Mono Version)