Function polkadot_node_subsystem_util::runtime::key_ownership_proof

pub async fn key_ownership_proof<Sender>(
    sender: &mut Sender,
    relay_parent: Hash,
    validator_id: ValidatorId
) -> Result<Option<OpaqueKeyOwnershipProof>, Error>where
    Sender: SubsystemSender<RuntimeApiMessage>,

Generate validator key ownership proof.

Note: The choice of relay_parent is important here, it needs to match the desired session index of the validator set in question.