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 0xf478da42bb5a0d8f2ab1edccc401ddf56378125473b550158009936f377807e5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01986e35-7ea7-4957-8ee0-facb5f8d2c38.json and https://artists.proofprofile.net/proofs/artist/01986e35-7ea7-4957-8ee0-facb5f8d2c38.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schubert, Gnattali & Vivaldi: Sonaten für Cello und Gitarre
Schubert, Gnattali & Vivaldi: Sonatas for Cello & Guitar
Notre amour – Stücke für Violoncello und Klavier