Jon Burr (born May 22, 1953, in Huntington, New York) is an American double bass player and author. He is a member of "Mark O'Connor's Hot Swing Trio", a swing jazz trio, along with Mark O'Connor and
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 0x79d87d41ac151d938f1a81e943c13bd210ff13a97a92106f4c16d390a0211f7a. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4397b4c6-4e1b-4dd5-897d-61b4f24f91cb.json and https://artists.proofprofile.net/proofs/artist/4397b4c6-4e1b-4dd5-897d-61b4f24f91cb.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.