Warrant Officer Class 2 Colin Thackery (born 9 March 1930) is a British Korean War veteran and singer who won the thirteenth series of Britain's Got Talent in June 2019. As the winner, he received £25
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 0xac037a9c6528885d64e7696bd5637bc7c320be3994460c7e3f6553bf91ee91af. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/468045d3-4cdb-4974-8360-99d34f02361c.json and https://artists.proofprofile.net/proofs/artist/468045d3-4cdb-4974-8360-99d34f02361c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.