Sarah L. Thornton (born 1965) is a writer, ethnographer and sociologist of culture.'Website of Sarah Thornton'. Retrieved 28 June 2009 Thornton has authored four books and many articles about artists,
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 0x695f1858f6604b4b4a97fe4b2eb1abaad53526eba4e5876b5f06c9f3175f107d. Chain 2 (Bitcoin): anchored in block 954729 (2026-06-21T18:16:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb01f5a8-5658-4d14-856d-8dce1e822932.json and https://artists.proofprofile.net/proofs/artist/fb01f5a8-5658-4d14-856d-8dce1e822932.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).