Get balance available to spend at the address
        :param address:
        :return:

def get_balance(self, address):
        """
        Get balance available to spend at the address
        :param address:
        :return:
        """
        spendables = self.get_unspent_outputs(address)
        if not spendables:
            logging.warning('address %s has a balance of 0', address)
            return 0

        balance = sum(s.coin_value for s in spendables)
        return balance