Function sp_runtime::verify_encoded_lazy

pub fn verify_encoded_lazy<V: Verify, T: Encode>(
    sig: &V, 
    item: &T, 
    signer: &<V::Signer as IdentifyAccount>::AccountId
) -> bool

Verify a signature on an encoded value in a lazy manner. This can be an optimization if the signature scheme has an "unsigned" escape hash.