Function compute_shielded_verification_fee 

pub fn compute_shielded_verification_fee(
    num_actions: usize,
    platform_version: &PlatformVersion,
) -> Result<Credits, ProtocolError>

Computes the compute-only shielded fee (in credits): the ZK-compute portion (Halo 2 proof verification + per-action spend-auth/nullifier processing) that GroveDB metering cannot see.

Unlike compute_minimum_shielded_fee this carries no storage term. It is used by the transparent Shield, which meters its note/nullifier storage writes via GroveDB and adds only this compute fee on top (as the event’s additional_fixed_fee_cost), so storage is never double-counted.

Dispatches on the SAME version key (dpp.methods.compute_minimum_shielded_fee) as compute_minimum_shielded_fee so the two formulas evolve together across protocol versions.

Parameters

• num_actions — number of Orchard actions in the bundle
• platform_version — protocol version (determines the formula version and fee constants)