Ahmed Tawhid Mahmoud Bahij Zaher (, born 13 December 1989 in Cairo), known as Ahmed Zaher, is an Egyptian trap shooter. He competed in the trap event at the 2012 Summer Olympics and placed 22nd in th
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 0xe93122dd4cdedd66b875bb59195d73961156f8f6604ec2d613419b9ace22d79d. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48f363e6-c7be-41a6-90a2-2d46fc5cc6af.json and https://artists.proofprofile.net/proofs/artist/48f363e6-c7be-41a6-90a2-2d46fc5cc6af.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).