William Cole (born 10 February 1965) is a male British former track and field athlete who specialised in the shot put. His personal best for the event was .Billy Cole . All Athletics. Retrieved on 201
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 0x3c624a9681b6ce54cd3a7d62e559ad33dcc2a60cd3024945e4e45add34ce1682. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0051ae6-b5ad-45f3-942a-97f1249ee1f6.json and https://artists.proofprofile.net/proofs/artist/f0051ae6-b5ad-45f3-942a-97f1249ee1f6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).