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 0x0c6da48013b173bdc66bd28db79c40d6444c1d0069261226d8c06e8f02227e30. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a13220af-e8e5-4677-85aa-2f714a1de4ce.json and https://artists.proofprofile.net/proofs/artist/a13220af-e8e5-4677-85aa-2f714a1de4ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart, l'ami Stadler, et le cor de basset
Mozart et les bohémiens: La dernière journée à Prague