Terry Durham (24 September 1936 – 6 December 2013) was an internationally known abstract and figurative artist and poet. Durham was born on 24 September 1936 in East Ardsley, West Yorkshire, where he
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 0xc56b3610076ab638c547cd5ac9582e18b1934e14cbdd684c3107a7edd14d58f4. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e76f32a-c61b-49b1-8bb1-fe17f5051190.json and https://artists.proofprofile.net/proofs/artist/6e76f32a-c61b-49b1-8bb1-fe17f5051190.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.