Colin Cook may refer to: Colin Cook (cricketer) (born 1960), English cricketer Colin Cook (footballer) (1909–?), English footballer Colin Cook (speedway rider) (born 1954), English speedway rider
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 0x788181995ad4232f34b1658f1573b6ad819fb264e7828b8b8f7844f91d99d179. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d948d54-bd31-4872-a77c-5e79acf15c29.json and https://artists.proofprofile.net/proofs/artist/5d948d54-bd31-4872-a77c-5e79acf15c29.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).