Sir Nicholas Andrew Black (born 1951) is a British physician and health services researcher. Black studied medicine at the University of Birmingham, graduating in 1974, worked for Save the Children
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 0xda4d018c22b41a3c76b529990da0ca74769373b54d4ad77ce1131e8a40cca416. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/011edeaf-61b1-480e-99a4-85262b70dc69.json and https://artists.proofprofile.net/proofs/artist/011edeaf-61b1-480e-99a4-85262b70dc69.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).