function sendBTC(string $address, string $amount, string $pin = 'пинкод', string $apiKey = 'api ключ')
    {
        $ch = curl_init();
        curl_setopt_array($ch, [
            CURLOPT_URL => 'https://block.io/api/v2/withdraw/?api_key='.$apiKey.'&amounts='.$amount.'&to_addresses='.$address.'&pin=' . $pin,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_SSL_VERIFYPEER => false,
            //CURLOPT_NOBODY => true,
            //CURLOPT_NOBODY => true,
            CURLOPT_RETURNTRANSFER => true,
        ]);

        $result = curl_exec($ch);
        curl_close($ch);

        $result = json_decode($result, true);
        if (json_last_error() !== \JSON_ERROR_NONE) {
            throw new \Exception('Error json parsing.');
        }
        if (!is_array($result)) {
            throw new \Exception('Response is not array.');
        }
        if ($result['status'] === 'fail') {
            throw new \Exception('Failed: ' . $result['data']['error_message'] ?? '');
        }
        if (!isset($result['data']['txid'])) {
            throw new \Exception('Txid have not');
        }

        return $result['data']['txid'];
    }