thumb|Les McCann Trio, Ron Jefferson on the right (1962) Ron Jefferson (February 13, 1926, in New York City Guillon, Roland (2005), Anthologie du hard bop: L'éclat du jazz noir américain, Editions L'H
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 0x866fac4f4f3b56322db90d6140a1703c96788d2ee1972ebf291b9f2d94e2f95f. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b65b605d-4164-4ed6-a8f0-50cdf2a68f6b.json and https://artists.proofprofile.net/proofs/artist/b65b605d-4164-4ed6-a8f0-50cdf2a68f6b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ron Jefferson & Tricky Lofton. Love Lifted Me / Brass Bag