@Test
public void testSignedMessageToKey() throws SignatureException {

    Sign.SignatureData signatureData = Sign.signMessage(TEST_MESSAGE, KEY_PAIR);
    System.out.println(Numeric.toHexStringNoPrefix(signatureData.getConcatenated()));
    ECPublicKey key = Sign.signedMessageToKey(TEST_MESSAGE, signatureData);
    assertThat(key, equalTo(PUBLIC_KEY));
}