Proving Parameters

Orchard shielded spends require Halo2 proving parameters (large files, downloaded once per machine).

Download

nozy proving --download
nozy proving --status

Desktop: Settings → Proving or automatic download on first send.

Parameters are cached on disk in the platform cache directory (see proving.rs / OS-specific paths). Expect hundreds of MB download.

First prove in a session loads/builds proving keys — often 1–3+ minutes additional wall time. Warm subsequent sends are faster.

CLI and api-server may call warm_orchard_proving_key() at unlock/startup in some builds.

Download on a networked machine first, then copy cache directory per operator docs for your OS version.