pub fn vrf_pre_digest<B, C>(
    client: &C,
    keystore: &KeystorePtr,
    nimbus_id: NimbusId,
    parent: H256
) -> Option<DigestItem>
where B: Block<Hash = H256>, C: ProvideRuntimeApi<B>, C::Api: VrfApi<B>,
Expand description

Uses the runtime API to get the VRF inputs and sign them with the VRF key that corresponds to the authoring NimbusId.