Vengerov () is a Russian and Ukrainian surname derived from the word vengr (венгр), which means "Hungarian". It was given to the people who arrived from Hungary and their descendants, not necessarily
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 0x484f43c52a8f45840b05a0a4e0fc7218673331010da9eb6e48019617761ff530. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1680d4e2-3ee2-49b6-96a1-da7abd9ee1f2.json and https://artists.proofprofile.net/proofs/artist/1680d4e2-3ee2-49b6-96a1-da7abd9ee1f2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).