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 0xe70a4b4d0f8b4ef48de019bdae066ba54f6788173ec16aea528bb25b58efbfb2. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b074f0b-bbeb-48a9-8056-63d6d4fc4761.json and https://artists.proofprofile.net/proofs/artist/6b074f0b-bbeb-48a9-8056-63d6d4fc4761.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Flute Concertos (Romantic) - Benoit, P. / Waelput, H. / Fetis, F.J.