thumb|"cempa" or "cempan" stood for 'warrior' in the ancient Anglo-Saxon texts. A champion (from the late Latin campio) is the victor in a challenge, contest or competition. There can be a territo
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 0x409caea1a94df1ebbe2fc341d85218e75957ee223ebbdd1b324c974fb0c68171. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/230d0433-070e-4f2f-bb23-2ae1a82d09ec.json and https://artists.proofprofile.net/proofs/artist/230d0433-070e-4f2f-bb23-2ae1a82d09ec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).