@classmethod
def get_transactions(cls, address):
    """Gets the ID of all transactions related to an address.

        :param address: The address in question.
        :type address: ``str``
        :raises ConnectionError: If all API services fail.
        :rtype: ``list`` of ``str``
        """
    for api_call in cls.GET_TRANSACTIONS_MAIN:
        try:
            return api_call(address)
        except cls.IGNORED_ERRORS:
            pass
    raise ConnectionError('All APIs are unreachable.')
