Giuseppe Greco (; 4 January 1952 – September 1985) was an Italian hitman and high-ranking member of the Sicilian Mafia. A number of sources refer to him exclusively as Pino Greco, although Giuseppe wa
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 0x0c8043afa6fb8028c0218dd5b79f26c0e73a3d2d3fdffaa91c9c8fe070ef6df1. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4a0b847-8ed0-4dca-a3e6-b6a1516a63d8.json and https://artists.proofprofile.net/proofs/artist/f4a0b847-8ed0-4dca-a3e6-b6a1516a63d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rachmaninoff: Prelude No. 12, in G Sharp Minor Op. 32