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 0xd10c30723bc5f9d3a4b6b419f78a02f2a5783d4d58755ed4b535a8ecd881c5a6. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a50ef302-599f-4feb-865e-44b3bb42d613.json and https://artists.proofprofile.net/proofs/artist/a50ef302-599f-4feb-865e-44b3bb42d613.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Giovan Battista Grazioli: Sonate Op. 3 per cembalo e violino obbligato