Joe Henderson (April 24, 1937 – June 30, 2001) was an American jazz tenor saxophonist and very occasional flute player. In a career spanning more than four decades, Henderson played with many of the l
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 0x15062f0ed2953f77fe2d8015f5b73f4852c399622cb4fea44973cd5398b5ee40. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e57c29ca-07a9-451a-99d2-498a6f15050c.json and https://artists.proofprofile.net/proofs/artist/e57c29ca-07a9-451a-99d2-498a6f15050c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.