Knockout Kings is a series of boxing video games produced by EA Sports for various platforms yearly between 1998 and 2003, and was replaced by the Fight Night series in 2004. Before releasing the fir
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 0xeee5110035375e2804d501902af19c02ff98dc4037605f615a79e28e58c75483. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d1d4b08-612b-4db3-9e62-071750c95a6d.json and https://artists.proofprofile.net/proofs/artist/7d1d4b08-612b-4db3-9e62-071750c95a6d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).