Calvin Lewis Barton (1874 – May 10, 1939) was a one-term Republican mayor of Norwalk, Connecticut. He was the son of Lewis Barton and Caroline C. Bebee. He graduated from Cornell University in 1899 in
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 0xc952c06e515e3d94403723c058d00759cd2c175c8f17e1031ad6af065855fa50. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bbeb9c87-bc00-433c-bdf4-6f3d1bb8d3b2.json and https://artists.proofprofile.net/proofs/artist/bbeb9c87-bc00-433c-bdf4-6f3d1bb8d3b2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).