crypto1xbit site is vulnerable. You can double your first bitcoin deposit and then instantly withdraw your money.

With this method you will be able to double your first Bitcoin deposit on a popular bookmaker site - crypto1xbit.

The only problem with this exploit is that you can use it only once. Crypto1xbit uses multiple recognization tools to find multi-accounts, therefore it's almost impossible to abuse this exploit. Just use it once for a good amount, then withdraw and you will be totally fine.

Guide: posted on this subreddit: /r/ManyVidsFree

How it works? The exploit will allow you to generate a second Bitcoin wallet on crypto1xbit, and when you make a deposit to the second address – your deposit will be doubled. Why? Because the website script doesn’t update the details instantly (it happens only after your refresh the page), so what it means is that when the new address receives a new deposit, the old one is still active, and since you have 2 addresses in their database, your deposit will count twice. It works only for the first deposit on the site.