def test_signmessage_low_s(self):
        """`$ bitcoin-cli verifymessage` does NOT enforce the low-S rule for ecdsa sigs. This tests we do the same."""
        addr = "15hETetDmcXm1mM4sEf7U2KXC9hDHFMSzz"
        sig_low_s = b'Hzsu0U/THAsPz/MSuXGBKSULz2dTfmrg1NsAhFp+wH5aKfmX4Db7ExLGa7FGn0m6Mf43KsbEOWpvUUUBTM3Uusw='
        sig_high_s = b'IDsu0U/THAsPz/MSuXGBKSULz2dTfmrg1NsAhFp+wH5a1gZoH8kE7O05lE65YLZFzLx3sh/rDzXMbo1dQAJhhnU='
        msg = b'Chancellor on brink of second bailout for banks'
        self.assertTrue(bitcoin.verify_usermessage_with_address(address=addr, sig65=base64.b64decode(sig_low_s), message=msg))
        self.assertTrue(bitcoin.verify_usermessage_with_address(address=addr, sig65=base64.b64decode(sig_high_s), message=msg))
`$ bitcoin-cli verifymessage` does NOT enforce the low-S rule for ecdsa sigs. This tests we do the same.
tests/test_bitcoin.py