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 0xfdc82096d6883c2892bd4160392d5d8ea70a9b06ea76f1b6e2ab8f1aa77669d9. 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/85cb0ea6-82b9-499b-9b76-486e389d5cbd.json and https://artists.proofprofile.net/proofs/artist/85cb0ea6-82b9-499b-9b76-486e389d5cbd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dutch Sonatas for Violoncello and Piano Vol. 1
Dutch Sonatas for Violoncello and Piano, Vol. 7