Karl Lieffen (17 May 1926 – 13 January 1999), born Karel František Lifka, was a German film actor. He appeared in more than 140 films on screen and television between 1949 and 1998. Biography He 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 0x4d4a1cabdbc1cfd563efa82f71bca4fbb4d364014aa4f202b5423edcf3e41474. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5a47a187-6583-47cb-a658-2d360f2e06dc.json and https://artists.proofprofile.net/proofs/artist/5a47a187-6583-47cb-a658-2d360f2e06dc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).