Marc-Uwe Kling (; born 1982) is a German songwriter, author, and Kabarett (political stand-up comedy) artist. He studied philosophy and drama at Freie Universität Berlin. Since 2003, Kling regularly
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 0x3f615f391794d2a61e221db9bff65c592763d6292fae493734bcef78b50b2bc3. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23abe83e-59ca-4ca5-b606-460618e70239.json and https://artists.proofprofile.net/proofs/artist/23abe83e-59ca-4ca5-b606-460618e70239.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Freddy und Flo 1: Freddy und Flo gruseln sich vor gar nix!