F. Lehar - V. Leon - L. Stein - F. Fontana - L. Ramo
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7560a562faedfe783010e62fb62f6add3a93eefe7f8b56c0764cfda38a7152. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/adca3f16-147f-4cbe-8cd3-45b5a40c4fc0.json and https://artists.proofprofile.net/proofs/artist/adca3f16-147f-4cbe-8cd3-45b5a40c4fc0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).