public bool Verify(ICoin coin)
{
// Verify that the coin has a valid signature using our public key.
byte[] id = coin.GetID();
byte[] signature = coin.GetSignature();
PssSigner signer = new PssSigner(new RsaEngine(), new Sha1Digest(), 20);
signer.Init(false, keys.Public);
signer.BlockUpdate(id, 0, id.Length);
return(signer.VerifySignature(signature));
}