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 0xb3372d37cdcc87f36133633f7cb782b8b6ba9ba595df5595ac84dd9552b882a5. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d8607da-9157-41f7-8919-6ffeff369815.json and https://artists.proofprofile.net/proofs/artist/9d8607da-9157-41f7-8919-6ffeff369815.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Johann Sebastian Bach, Trio Sonata No. 1 In E Flat, BWV 525
Johann Sebastian Bach, Antonio Vivaldi, Organ Concerto In D Minor, BWV 596 / Rv 565