Duke Tumatoe, born William “Bill" Severen Fiorio in 1947, is an American blues guitarist, vocalist and songwriter. He has performed with Muddy Waters, Bo Diddley, B.B. King, Willie Dixon, Buddy Guy, J
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 0x99f2f91f5a0932b1284702272ef26529808e56bfd69dc33504c78c706917bfd1. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/783dae1f-0739-483f-bac4-e19368f49932.json and https://artists.proofprofile.net/proofs/artist/783dae1f-0739-483f-bac4-e19368f49932.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).