Warren Anderson Mathis (born March 6, 1977), better known by his stage name Bubba Sparxxx, is an American rapper. His 2001 single, "Ugly" (featuring Timbaland) peaked at number 15 on the Billboard Hot
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 0xc0dfaf5d005dcd95b25b653b6ba5ed45857061467989ecb794ec9f9163a71371. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6f3e5b0-9ac1-4187-b963-5b56791be951.json and https://artists.proofprofile.net/proofs/artist/a6f3e5b0-9ac1-4187-b963-5b56791be951.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).