Matteo Carcassi (8 April 1792 – 16 January 1853)Raffaele Carpino, Mario dell'Ara: "Matteo Carcassi. Un nuovo aggiornamento biografico", in: Il Fronimo no. 184 (2018), p. 5–9. was an Italian guitarist,
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 0x00c403733f0f7ba210ab96cfe832b4526f07b694133ca276a719f26ce41da788. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/043993a1-388b-4f69-abcf-10d89d997ead.json and https://artists.proofprofile.net/proofs/artist/043993a1-388b-4f69-abcf-10d89d997ead.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).