"Mr. Blue" is a popular song written by DeWayne Blackwell that was a hit for the Fleetwoods, reaching number one on the Billboard Hot 100 in November 1959, giving the group its second chart-topping hi
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 0xc43c40634dbe9da2712682b70bf776c38ededc2875ff351145609a8ead788d1e. 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/b3ed8df3-02a1-4f8a-a4f1-47eff8d66bfa.json and https://artists.proofprofile.net/proofs/artist/b3ed8df3-02a1-4f8a-a4f1-47eff8d66bfa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).