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 0xff172981776d96b8819ed42671e4dd847ddc09140043053d4ccec834c1bb6a53. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12202be4-fb3d-4638-8bd3-600d89c625b0.json and https://artists.proofprofile.net/proofs/artist/12202be4-fb3d-4638-8bd3-600d89c625b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La poésie des roses (with Emily Loizeau)