Bisto is a popular and well-known brand of gravy and other food products in the United Kingdom and Ireland owned by Premier Foods. History Invented by Messrs McRoberts and Patterson in 1908, the firs
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 0xdd43f0982c12d010a3e24633ea92d117e5630699550e5dc9e20a47133f64009f. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8afefcc-6605-45e6-87e8-c23ec22721dc.json and https://artists.proofprofile.net/proofs/artist/b8afefcc-6605-45e6-87e8-c23ec22721dc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).