Bonaci (Italian: Bonazzi) is a village in the municipality of Poreč-Parenzo, Istria in Croatia. The total area of Bonaci-Bonazzi is 2.5 km2. Demographics According to the 2021 census, the village's p
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 0xeef93237c8b734d7d6ccc5b53db312c1927f4445a55284b81e8de10ac1c59a33. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e5590d35-3c60-4a5e-a7cf-f1ec74856945.json and https://artists.proofprofile.net/proofs/artist/e5590d35-3c60-4a5e-a7cf-f1ec74856945.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.