Walter Sittler is an American-German actor, producer, and writer. Early life thumb|Deutscher Fernsehpreis 2012 – Aglaia Szyszkowitz and Walter Sittler at the Deutscher Fernsehpreis 2012 Sittler was
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 0xf8c815fb9887d8f77a9965a49b684cc2c75f30c68357293d3bc8e0b24dff1a5a. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b3f8bf74-7496-4e54-8337-05bbd06d322a.json and https://artists.proofprofile.net/proofs/artist/b3f8bf74-7496-4e54-8337-05bbd06d322a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).