public function byHash($hash)
    {
        $params = ["hash" => $hash];
        $apiUrl = $this->getPath('get', $params);
        $response = $this->api->getJSON($apiUrl);

        //XXX include Error checks
        $object = json_decode($response, true);
        return $this->createTransactionModel($object['data']); //XXX brr => error/content validation first
    }