Sir George Constantinou OBE (10 May 1930 – 16 December 2008) was a Papua New Guinean businessman and builder. Constantinou, who was born in Cyprus, immigrated to Papua New Guinea in the 1950s. He was
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240458be8a608710745c03c21e890f6c3c28b54e06c23090922fd9470f074877. Chain 2 (Bitcoin): anchored in block 953932 (2026-06-16T11:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ef57eaf-8429-4a3b-9549-24a01912a015.json and https://artists.proofprofile.net/proofs/artist/1ef57eaf-8429-4a3b-9549-24a01912a015.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).