Christopher Andrew Barker (2 March 1980 – 1 January 2020) was an English professional footballer who played as a defender. He represented Alfreton Town, Barnsley, Cardiff City, Stoke City, Colchester
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 0x97927dead31580edc63042d5368d5c2b5d216aaccfd0c3b2c72101459c926529. 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/6d13567b-bb00-451c-93f7-2cd831fc0f90.json and https://artists.proofprofile.net/proofs/artist/6d13567b-bb00-451c-93f7-2cd831fc0f90.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.