Los Barrios is a small town and municipality in the south of Spain. It is part of the province of Cádiz, which in turn is part of the Andalusia region. It belongs to the Campo de Gibraltar comarca. Th
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 0xa539d5072db7bedb19f6fb474e8cfba09328f004947d211dacc33a9d5b1f5e46. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/357a51b0-0cad-4677-a2d8-0ef5734a9b60.json and https://artists.proofprofile.net/proofs/artist/357a51b0-0cad-4677-a2d8-0ef5734a9b60.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).