pub fn prove_session_membership<T: Config, D: AsRef<[u8]>>( session_index: SessionIndex, session_key: (KeyTypeId, D) ) -> Option<MembershipProof>
Create a proof based on the data available in the off-chain database.
Based on the yielded
MembershipProof the implementer may decide what
to do, i.e. in case of a failed proof, enqueue a transaction back on
chain reflecting that, with all its consequences such as i.e. slashing.