Tergu () is a comune (municipality) in the Metropolitan City of Sassari in the Italian region Sardinia, located about north of Cagliari and about northeast of Sassari in the Anglona historical regio
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 0xa9390d575b61a69d9db25269b8205c2137f9eda29ec76aaa76dd4fc39c8d5dcf. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c22a4682-b083-45fc-b461-ee03d1b294c8.json and https://artists.proofprofile.net/proofs/artist/c22a4682-b083-45fc-b461-ee03d1b294c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).