Caroline Watson (1761?–1814) was an English stipple engraver. Life The daughter of the Irish engraver James Watson, she was born in London in 1760 or 1761, and studied under her father, who worked 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 0x86c059d370f3af2aeeec94b58b14c0f9eb927c81f0414f380482bf4964b12ece. 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/1d35442f-42de-44c3-9527-9168c385c49b.json and https://artists.proofprofile.net/proofs/artist/1d35442f-42de-44c3-9527-9168c385c49b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.