William Duffy (February 1, 1958 – March 24, 2020) known professionally as William Dufris or Bill Dufris, was an American voice actor and audiobook narrator. Career Dufris began his audio career in
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 0xec44bbdf9de56cb66500b9f0a2019936d051ec76ef06129729a75b1402af3cb1. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b57cdd30-e533-4f41-9627-9a4f4a224873.json and https://artists.proofprofile.net/proofs/artist/b57cdd30-e533-4f41-9627-9a4f4a224873.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).