John Warren may refer to: Entertainment John F. Warren (1909–2000), American cinematographer John Warren (actor) (1916–1977), British screenwriter and actor John Warren (musician) (born 1938), Can
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 0xd0e4be8f387e3247c31e54e2088c4c68b6b988b3dabc994db196830b6b3861d8. Chain 2 (Bitcoin): anchored in block 954019 (2026-06-16T23:44:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3519f7b8-8f5c-49bd-8611-454201544b40.json and https://artists.proofprofile.net/proofs/artist/3519f7b8-8f5c-49bd-8611-454201544b40.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).