John Armor Bingham (January 21, 1815 – March 19, 1900) was an American politician who served as a Republican representative from Ohio and as the United States ambassador to Japan. In his time as a con
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 0x748f1c67893b6a0f901aa4c7df6a6e486468760d5e8a473a4d423d197477ae01. Chain 2 (Bitcoin): anchored in block 953706 (2026-06-14T23:14:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c7fcbf9-c75c-4361-b869-898ebdcc2921.json and https://artists.proofprofile.net/proofs/artist/7c7fcbf9-c75c-4361-b869-898ebdcc2921.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).