Mohamed Tarek (; born 19 October 1989) is an Egyptian professional footballer who plays as a right back. In 2017, Tarek signed a 2-year contract for Al-Assiouty in a free agent transfer from Petrojet.
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 0x85c3cf3f22068c408e3f4e3cd04425b2afa17488f449090aab296d96c3a1036c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c98f384-f843-4c8c-85ff-c1c6d1af597d.json and https://artists.proofprofile.net/proofs/artist/1c98f384-f843-4c8c-85ff-c1c6d1af597d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).