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 0xeb73933abb5ca2afa47a6c6707ba98605d568e3ece42d7c1baf8d8f74615113c. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c72ddf25-f320-4264-9f20-32d658d9267e.json and https://artists.proofprofile.net/proofs/artist/c72ddf25-f320-4264-9f20-32d658d9267e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Fantasia - Mendelssohn: Fugue - Langlais: Mosaique, 8 Préludes - Carleton: A Verse - Johnstone: Shack-up and Feud - Leighton: Martyrs