Mixed By: M.Braccagni & Roberto Gallo Salsotto
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 0xef1627c40e06d1f066a5b0b513d2d994297671b35c7e1c58086ec5448fe7f0ac. 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/bdad5587-d5c6-46b4-aa3b-00958fca6e98.json and https://artists.proofprofile.net/proofs/artist/bdad5587-d5c6-46b4-aa3b-00958fca6e98.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).