Fatna Bent Lhoucine (in Arabic: فاطنة بنت الحسين) (born 1935 - died 6 April 2005 in Sidi Bennour, Morocco) was a Moroccan singer specialized in the Aita and Chaabi music. She was a prominent artist in
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c489ccbbd6dd0d0034caabbb5bb7c3f86661bc9c1f9c3c36c424bdad67b5c92. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9194c0f-9696-4772-9b91-807567dcd877.json and https://artists.proofprofile.net/proofs/artist/b9194c0f-9696-4772-9b91-807567dcd877.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).