We want to let you know that we found a little bug in the old version that won't let you withdraw your Bitcoin earnings.
Please, if you have an old version of the game, get the latest one which has the fix for the withdrawal process issue.
Note: after you update the game, your earnings will still be there, you won't lose them! Don't you worry ;)
And.. good news: soon we will lower the minimum balance required to be able to withdraw!