Thomas Arnot Lumsden was a Scottish mathematician, who was educated at the University of Edinburgh, and lectured at Birmingham University. He published "A certain type of Fourier-Bessel Series", a p
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 0xc1e3504f5f390772bd93470b39563f75c6edb53e4a9af76f2e9f6a1be3476cd9. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/298fb6c5-5c67-4cec-8fc3-d914a379ad58.json and https://artists.proofprofile.net/proofs/artist/298fb6c5-5c67-4cec-8fc3-d914a379ad58.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).