fun KeyPair.verify(signatureData: ByteArray, clearData: ByteArray): Boolean
Helper function for the signers to verify their own signature.
signatureData - the signature on a message.
clearData - the clear data/message that was signed (usually the Merkle root).
InvalidKeyException - if the key is invalid.
SignatureException - if this signatureData object is not initialized properly,
the passed-in signatureData is improperly encoded or of the wrong type,
if this signatureData algorithm is unable to process the input data provided, etc.
IllegalArgumentException - if the signature scheme is not supported for this private key or if any of the clear or signature data is empty.