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 0x5c9e7a2e894c267ecd8c146e0553351cd009450d25dd187eb20e1986899f13f8. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa71249b-61f2-4796-877d-e9a8c8610829.json and https://artists.proofprofile.net/proofs/artist/fa71249b-61f2-4796-877d-e9a8c8610829.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Event Horizon (25th Anniversary Release)