$apikey=$datos[$i]->api_key;
    $secreat_key=$datos[$i]->security_key;
    // $nonce = time();
    $uri='https://bittrex.com/api/v1.1/account/getbalances?apikey='.$apikey.'&nonce='.'';
    $sign = hash_hmac('sha512',$uri,$secreat_key);
    $ch = curl_init($uri);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('apisign:'.$sign));
    //$execResult = curl_exec($ch);
    $obj=json_decode(curl_exec($ch));