thumb|Australian soldiers in a front-line trench during World War I. Photograph taken by Capt. F. Hurley, sometime between August 1917 and August 1918. A front line (alternatively front-line or frontl
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 0xff39e1b4080e7dc7fb434ba55bb63d9fe1bfcd9b6ab7e9dd0c2c79be56062a03. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2922c135-143a-40da-adaf-ce6bd75dd50b.json and https://artists.proofprofile.net/proofs/artist/2922c135-143a-40da-adaf-ce6bd75dd50b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).