This guide is specifically for the new trading-card-game (TCG) HearthStone, but really it can be applied to any beta key.
While it might seem fairly simple to buy or sell a beta key, there’s lots of scammers looking to take advantage since it’s very difficult to prove if a key has been used or not before the sale. The number one problem that arises is once you get the key it’s either fake or has already been used. To help you out I’ve outline what you should do before you buy a beta key so you can verify it’s real and hasn’t already been used.
If the seller you are buying from already has good feedback, you probably can trust the key is real and can skip the below steps. However if it’s someone with less than 5 feedbacks, I would highly recommend following all the steps.