Isabel Gülck (born 11 February 1991), known professionally as Isi Glück, is a German partyschlager singer. Since 2017, she has performed regularly at the Mega-Park in Mallorca and, in winter, at the "
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 0x91dff40209ba5691ffb02b3ee992e63e0bc302fe8eb4a657f1d6c60297663b58. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99ef7dcd-3d28-40dd-bfc5-d9d54cd4d133.json and https://artists.proofprofile.net/proofs/artist/99ef7dcd-3d28-40dd-bfc5-d9d54cd4d133.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).