Sir Frederick Norton Kay Menzies (2 November 1875 – 14 May 1949) was a British physician and public health expert. He was Honorary Physician to King George VI. Early life He was born in Caernarvon on
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 0x5d283d28a937c4eb31a06e8f377143bc73dfa24c1de63550500319066b7a73c9. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a609bc99-206d-47a4-9551-27c35a19c3a6.json and https://artists.proofprofile.net/proofs/artist/a609bc99-206d-47a4-9551-27c35a19c3a6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).