thumb|Karl Knortz (photo before 1911) in the weekend magazine Rhein und Düssel from August 26, 1911 Karl Knortz (28 August 1841 Garbenheim, Rhenish Prussia – 27 July 1918 North Tarrytown, New York) wa
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 0xd3b3a9b3c08b796cf3fe0a81fc74ebd7e37035d2b711e6f06f1c221e7bb5fe72. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9af36873-8400-437f-a94d-e845f8de1d4a.json and https://artists.proofprofile.net/proofs/artist/9af36873-8400-437f-a94d-e845f8de1d4a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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