Saber Bamatraf () is a Yemeni musician and cultural activist. He is a self-taught pianist and composer known for his activism and artistic collaboration with his wife the visual artist Shatha Altowai.
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 0x9ba87646d91bfece322a4c745dce9e4d7bd6d8c6530bf30e5a789fa2571a2989. Chain 2 (Bitcoin): anchored in block 953932 (2026-06-16T11:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1db6114e-97d2-474e-981e-c003847c0474.json and https://artists.proofprofile.net/proofs/artist/1db6114e-97d2-474e-981e-c003847c0474.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bella Ciao (La Casa De Papel El Profesor)
Dhabi AlYaman (Piano & Orchestral Variations)