Marco Marin (born 4 July 1963) is an Italian politician, dentist and fencer. He won a gold, two silvers and a bronze in sabre events at three Olympic Games between 1984 and 1992. He served as a Senato
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16da7c0c82e198968ebbca1e0cca90b7418699406f1856ad8a81439ff43f3eaf. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b58b78d0-29d8-4fc9-b26b-abc2f2b434fa.json and https://artists.proofprofile.net/proofs/artist/b58b78d0-29d8-4fc9-b26b-abc2f2b434fa.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.