Cujo () is a 1981 horror novel by American writer Stephen King about a Saint Bernard who contracts rabies, then goes on a killing spree in his hometown. The novel won the British Fantasy Award in 1982
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 0x464761f95e5883fbd4ea089de6a23ad4bee83d3ecc9a56e197e569dc246e8865. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e128b052-d264-46da-8b79-bd7ffbd1e15d.json and https://artists.proofprofile.net/proofs/artist/e128b052-d264-46da-8b79-bd7ffbd1e15d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).