private static long checkBalance(List<String> addresses) throws IOException, InterruptedException {
        String urlbalance = "https://blockchain.info/balance?active=";
        BufferedReader in;
        URL url = new URL(urlbalance + Joiner.on(",").join(addresses));
        in = new BufferedReader(new InputStreamReader(url.openStream()));
        String json="";
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            json += inputLine;
        }
        boolean x = false;
        Map<String, LinkedTreeMap> addressBalance = GSON.fromJson(json, Map.class);
        long final_balance = 0L;
        for (Map.Entry<String, LinkedTreeMap> entry:addressBalance.entrySet()){
            final_balance = ((Double)entry.getValue().get("final_balance")).longValue();
            if (final_balance>0){
                if (!x){
                    System.out.println("");
                }
                System.out.println(Utils.SPACE_JOINER.join(addresses)+" "+entry.getKey()+" "+final_balance);
                x = true;
            }
        }
        Thread.sleep(2000);
        return final_balance;
    }