Steven Isserlis, Michael Tilson Thomas, and Dudley Moore
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 0x618147f5e7372376e8e6321aa529726c166607f3bd96231ebd83584535e1f531. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2990e0b7-8510-44a4-80ad-c40d02a3a8e1.json and https://artists.proofprofile.net/proofs/artist/2990e0b7-8510-44a4-80ad-c40d02a3a8e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).