Mohammed Ismail Sherif (born 9 January 2002), professionally known as Black Sherif and formerly Blacko, is a Ghanaian singer, rapper and fashion model. He initially gained popularity in 2021 with his
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 0x7ac8f28c9e875ad6e029ebd496e06672cf4326a920a4179819321de6f6bb2d6d. Chain 2 (Bitcoin): anchored in block 953743 (2026-06-15T04:52:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2fd7f6c-1144-467a-95d0-b8e27ceffd01.json and https://artists.proofprofile.net/proofs/artist/a2fd7f6c-1144-467a-95d0-b8e27ceffd01.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).