Federico Marchetti (; born 7 February 1983) is an Italian former professional footballer who played as a goalkeeper. Marchetti began his professional club career with Torino in 2002, and was subseque
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 0x7036179db5516ccf20a4594c4edd7c4a9d7ea39ce63634578973858872d7817b. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9fa4a0e6-a114-44d4-9af1-c3d82c0c5044.json and https://artists.proofprofile.net/proofs/artist/9fa4a0e6-a114-44d4-9af1-c3d82c0c5044.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).