The Dogado, or the Duchy of Venice, was the metropolitan territory of the Republic of Venice, headed by the Doge, traditionally from 697, and up to 1797. It comprised the city of Venice and the narrow
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 0xc8266967a4fa4014018f1ec590c5e29d6fc3dfc20fad73d8cb63490f3e74f998. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cdc622ff-a147-4182-9b52-4c17bd1d4e26.json and https://artists.proofprofile.net/proofs/artist/cdc622ff-a147-4182-9b52-4c17bd1d4e26.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).