Paul John Buckmaster (13 June 1946 – 7 November 2017) was a British cellist, arranger, conductor and composer, with a career spanning five decades. He is best known for his orchestral collaborations
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 0x2350277332edfc46a500f3e7ce9c9a0469ac966feae7461ec82369d3df0d1b57. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d59e15c5-d062-484a-b5ed-34bc18a2b019.json and https://artists.proofprofile.net/proofs/artist/d59e15c5-d062-484a-b5ed-34bc18a2b019.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).