Verify a contract

For police, lawyers, courts and the parties themselves. Drop in the proof file (JSON) that a party downloaded from their signed contract. The check runs entirely in your browser; the file is not uploaded.

Drop the proof file here or choose itRead locally in this browser. Nothing is sent to Mukari.

Or paste the proof JSON

Why the content isn’t shown here by Mukari

The items, values and receiver are end-to-end encrypted: only the two parties can read them, and Mukari can’t. A party presents the contract by handing over the signed PDF (printed from their app) together with this proof file. The fingerprint H printed in the PDF’s appendix must equal the H shown above.

What this check relies on

Signatures: standard Ed25519. Hashes: SHA-256. Anyone can re-check them with common tools; the steps are printed in the PDF appendix.
Mukari’s attestation keys, including retired ones with their validity periods, are published at /api/attestation-key.
The timestamp comes from an external timestamp authority, independent of Mukari.