Dr Jessica Pearsall Gardner (born July 1971) is an English academic librarian who has been the University librarian of the University of Cambridge since April 2017. Gardner is a Fellow of Selwyn Colle
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf67f24add0ce11815a02c4742f61d50af8b8a44fae132e6f4408cb591a823de. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf2671dc-2070-437f-bc13-aef0b0d8c242.json and https://artists.proofprofile.net/proofs/artist/cf2671dc-2070-437f-bc13-aef0b0d8c242.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).