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 artist was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c02abf0a3de80cdb9cb32be4ec353c4d09763d010b63b41f7ce6a70609c4ea9. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89444d7a-c8dc-4b6d-99f8-30d07ddd7bd9.json and https://artists.proofprofile.net/proofs/artist/89444d7a-c8dc-4b6d-99f8-30d07ddd7bd9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).