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 0x424014b00c8cd349be90822bff3088c09a7ea489bf774c0a325b29ac2fee4cca. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1475a213-bd64-4c5a-a24e-4d919acb47c5.json and https://artists.proofprofile.net/proofs/artist/1475a213-bd64-4c5a-a24e-4d919acb47c5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Clifford Curzon Edition: Complete Recordings
Dvorak:String Quartet, Op. 51; Piano Quintet, Op. 81
Clifford Curzon: Decca Recordings 1941-72, Vol.2