Deep Red (), also known as The Hatchet Murders, is a 1975 Italian giallo film directed by Dario Argento, written by Argento and Bernardino Zapponi, and starring David Hemmings, Daria Nicolodi, Gabriel
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 0x974b93a81658f7102408d0814544331653adbc9e02fadc65c7e54c5f5aec67f7. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4bdcfad6-02a8-4847-8fb8-44589c791443.json and https://artists.proofprofile.net/proofs/artist/4bdcfad6-02a8-4847-8fb8-44589c791443.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).