Bonny "Mack" Rice (November 10, 1933 – June 27, 2016), sometimes credited as Sir Mack Rice, was an American songwriter and singer. His best-known composition and biggest hit as a solo performer was "M
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 0x5bf00d933c2583a29735a1b5471cd1cc232ecfaf32a65ea60c83abff780c569b. Chain 2 (Bitcoin): anchored in block 953780 (2026-06-15T12:02:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3dfd43d-b79e-4389-b1bb-b415c31c000e.json and https://artists.proofprofile.net/proofs/artist/d3dfd43d-b79e-4389-b1bb-b415c31c000e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).