Zvana () is a rural locality (a village) in Nikiforovskoye Rural Settlement, Ustyuzhensky District, Vologda Oblast, Russia. The population was 37 as of 2002.Данные переписи 2002 года: таблица 2С. М.:
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 0xe8a9a5454ac2833525e2c99e90056ac762ba3f67f6783cf2209824fe11f58040. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2aa3e6c-24b5-4a82-a7d3-7beac2db8e63.json and https://artists.proofprofile.net/proofs/artist/b2aa3e6c-24b5-4a82-a7d3-7beac2db8e63.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).