The Last Don is a 1996 novel by American author Mario Puzo, best known as the author of the 1969 novel The Godfather. The story follows an aging Mafia Don and his family as they try to retain power.
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 0x78bcf8de0b1b616be40f7526c85138bfcf04a94d2d8e69183bbabcff0ed26530. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69332c2e-2468-4638-aede-a1d75bc9904c.json and https://artists.proofprofile.net/proofs/artist/69332c2e-2468-4638-aede-a1d75bc9904c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).