William Osser Xavier Cook (October 8, 1895 – May 5, 1986) was a Canadian professional ice hockey player who was a right winger for the Saskatoon Crescents of the Western Canada Hockey League (WCHL) an
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4791846de7831aa99c54ce6f4979538cd9eb002ff411bd537c990efc7ac6ad. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab17a76d-8c42-4565-9b1f-df29ee24ef15.json and https://artists.proofprofile.net/proofs/artist/ab17a76d-8c42-4565-9b1f-df29ee24ef15.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).