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 0xfc765b58d68b9f4aa3c262b4a6120cfe60b089b79404f876f488fc8a04224569. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d989baa5-2912-4c54-ac1c-87b95f117ff7.json and https://artists.proofprofile.net/proofs/artist/d989baa5-2912-4c54-ac1c-87b95f117ff7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schubert: Winterreise (Transcription for Baritone and String Quartet)