Artur "Atze" Brauner (born Abraham Brauner; 1 August 1918 – 7 July 2019) was a German film producer and entrepreneur of Polish origin. He produced more than 300 films from 1946. Life and career
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 0x8f87b950aaecebedfe86f5f0bbb147e9be536ef8f3b2d3743fae3b39df3a8064. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c166f72d-35e3-4dc6-97c0-8b1994396dd0.json and https://artists.proofprofile.net/proofs/artist/c166f72d-35e3-4dc6-97c0-8b1994396dd0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.