The Five Du-Tones were an American soul vocal group, who enjoyed success in the dance craze era of the early 1960s. The group comprised Willie Guest, Robert Hopkins, LeRoy Joyce, Oscar Watson and Jame
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 0x128f91cdf896352c7e4c90b5b9633d684f06ca3ce8191869d08f8ef8c7d85e84. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f70caa3-fc0a-4485-b7e8-17e13c2c5f55.json and https://artists.proofprofile.net/proofs/artist/8f70caa3-fc0a-4485-b7e8-17e13c2c5f55.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).