Katharina Löwel (born 22 January 1982), better known under her stage name Kitty Kat or Kitten Ket, is a German rapper and singer. She became famous as an Aggro Berlin member, where she was signed from
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 0xbcf8602b2763d88bbc3a965009060e09c2456af8cd98aa849a704eeb97a6a4be. Chain 2 (Bitcoin): anchored in block 954038 (2026-06-17T02:57:22Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3cf21423-9736-453f-9636-bd5b9fa39a5f.json and https://artists.proofprofile.net/proofs/artist/3cf21423-9736-453f-9636-bd5b9fa39a5f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).