thumb|Fritz Kreisler, Harold Bauer, Walter Damrosch and Casals, at Carnegie Hall on 13 March 1917 Pablo Casals (29 December 187622 October 1973), also known by his birth name, Pau Casals i Defilló (Ca
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 0x5c9407b444645b1fc085b6dae5705c3ffddd8e92679d87562f536ef4ccc5e392. Chain 2 (Bitcoin): anchored in block 954174 (2026-06-18T03:01:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d082eca-fcce-40fe-9330-5f0e6a670163.json and https://artists.proofprofile.net/proofs/artist/7d082eca-fcce-40fe-9330-5f0e6a670163.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach, Beethoven & Brahms: Cello Suite and Sonatas
Edward William Elgar & Camille Saint-Saëns: Masters of Music, Vol. 86