The Last Detail is a 1973 American comedy-drama film directed by Hal Ashby, from a screenplay by Robert Towne, based on the 1970 novel by Darryl Ponicsan. The film stars Jack Nicholson, Otis Young, Ra
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 0xeec070f0b912d0740119ca74977c07170c3e9b7958f044a2bceca20cfa8a67a7. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a44b537-2a51-4585-82c0-697d44d8dcf8.json and https://artists.proofprofile.net/proofs/artist/1a44b537-2a51-4585-82c0-697d44d8dcf8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).