James Frederick Keen (25 December 1895 – 1980) was an English footballer who played in the Football League for Bristol City, Hull City, Newcastle United, Queens Park Rangers and Wigan Borough. Refere
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 0x77d4ded0536c9b35fdd232c40473df11999cf060fac83a2f1a0bef7ebb81cdd5. 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/605a3fa8-b958-43e9-b467-82f9734427e7.json and https://artists.proofprofile.net/proofs/artist/605a3fa8-b958-43e9-b467-82f9734427e7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).