Helen Chadwick (18 May 1953 – 15 March 1996) was a British sculptor, photographer and installation artist. In 1987, she became one of the first women artists to be nominated for the Turner Prize.Tate
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 0x77a2ecf52aef0f71d1734f2bbccd447931b7602260def1bdd0a1665439a0ad9f. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e58b310b-8997-43e1-ba4a-a860c1c27a8b.json and https://artists.proofprofile.net/proofs/artist/e58b310b-8997-43e1-ba4a-a860c1c27a8b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Norfolk Songline: A Celebration of the Peddars Way