Shmuel Barzilai (; born 3 June 1957) is an Israeli cantor. He is the chief cantor of the Israelitische Kultusgemeinde Wien in Vienna. Biography Shmuel Barzilai was born in Jerusalem. He is a son of S
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f9f321257dd00849d6b4e95ee26dadda2b076bbcbac9700a0355f2b32487eb. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/048572aa-217f-4ce8-af16-4a7a615cf27e.json and https://artists.proofprofile.net/proofs/artist/048572aa-217f-4ce8-af16-4a7a615cf27e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).