Abdallah Khaled Sheikh (; born 10 April 1998) is a Yemeni professional footballer who plays as a forward for Qatar Stars League side Umm Salal. References External links Category:1998 births Cate
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 0x05da309d0a933576d2667966426aa2ea930006421d4a0db368242667334a895a. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f669840-7fa1-4112-9f9d-81d7b6aba3d1.json and https://artists.proofprofile.net/proofs/artist/1f669840-7fa1-4112-9f9d-81d7b6aba3d1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).