Slixs (styled SLIXS) is a German a cappella sextet with members from Essen, Dresden, Leipzig and Halle. When the formed a group around 1996, they called it Stouxingers. The present formation of Kathar
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 0xd64fdec6c410363a4b24d6474a037a6254a45d5a44c22e4c85a2772e63f6c2ac. Chain 2 (Bitcoin): anchored in block 953871 (2026-06-16T01:46:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05f2541c-96b6-47ac-8f65-bbd06112c6fc.json and https://artists.proofprofile.net/proofs/artist/05f2541c-96b6-47ac-8f65-bbd06112c6fc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Human (with Gregorio D' Clouet Hernández (GOJO), Karsten Müller, Katharina Debus, Konrad Zeiner, Michael Eimann & Thomas Piontek)