pub(super) fn from_rsv(r: &H256, s: &H256, v: u8) -> Self {
        let mut sig = [0u8; 65];
        sig[0..32].copy_from_slice(r.as_ref());
        sig[32..64].copy_from_slice(s.as_ref());
        sig[64] = v;
        Signature(sig)
    }
Create a signature object from the RSV triple.
core/lib/crypto_primitives/src/ecdsa_signature.rs