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 0xf70b19184342f67d537e280df0e29a5e05e046926500ef4c01360fea2c1d453c. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f7b2222-e6d5-4032-8e40-406f2cf7011f.json and https://artists.proofprofile.net/proofs/artist/8f7b2222-e6d5-4032-8e40-406f2cf7011f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sheremetyev Ensemble - Mitchell in Moscow
John Mitchell: Music for Woodwind, Vol. 1
John Mitchell: Invocations, Preludes & Color Pieces