Cheryl Elizabeth Gamble (formerly Clemons; born June 13, 1970), known professionally as Coko, is an American singer-songwriter best known as the lead singer of the R&B vocal trio Sisters With Voices (
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 0x2dcf7a07dc8f04b7fab97498877997b9d4983315b94d14b3a80d99f8b9efdd0e. Chain 2 (Bitcoin): anchored in block 954020 (2026-06-16T23:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37ae5ad1-0894-429a-a485-92dfef30f003.json and https://artists.proofprofile.net/proofs/artist/37ae5ad1-0894-429a-a485-92dfef30f003.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).