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 0xfdb5d14b3e1607ab294500444ab7cac4b6e28892e9df0d25f5990316258f8f34. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ea62968-1878-4019-91f7-7d9e55224445.json and https://artists.proofprofile.net/proofs/artist/1ea62968-1878-4019-91f7-7d9e55224445.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
W. A. Mozart: Sinfonia Concertante in E flat Major / Concertone in C Major / Sinfonia Concertante in A Major