1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0x3f30565ce4abb78b5d6ce5870feaf9254a764eed2dd835128a92bac5ec722731. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8894c712-27d6-4766-afd9-b05206965118.json and https://artists.proofprofile.net/proofs/artist/8894c712-27d6-4766-afd9-b05206965118.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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Kutmah presents: Sketchbook Radio Archives, Vol. 1