John Cartier (23 May 1733 – 25 January 1802) was a British colonial governor in India. He served as Governor of Bengal from 1769 to 1772. Early career Cartier first arrived in India as a writer 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 0x04f863cea36c2a14a38f4b6243c5826515adfe035cfcb1bd6a9f3627e388b697. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1acb34ef-6941-41a9-89dc-909493c2e318.json and https://artists.proofprofile.net/proofs/artist/1acb34ef-6941-41a9-89dc-909493c2e318.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).