Function cached_managed_zcashd_binary_is_present 

pub(super) fn cached_managed_zcashd_binary_is_present(
    state_cache_dir: &Path,
) -> Option<bool>

Returns whether a cached managed zcashd binary exists for this target with a provenance marker recording the manifest-pinned archive digest, or None when managed downloads are unsupported for this target.

Preflight uses this to decide whether a download is likely needed, so it compares the marker’s recorded archive digest (a cheap string check that catches a bumped release pin) but deliberately skips re-hashing the whole binary: the security-critical digest verification happens in resolve_managed_zcashd_binary before the binary is used.

Only called from Linux-gated preflight code, so it is dead code on other targets.