Reply from our coder:

"It's currently very simple how the pick winner script works. We first create an array of all the tickets that are entered for the draw and then generate a random integer between 0 and the end of the array. The ticket at that random position is chosen as the winner and is sent their funds. Currently we are using the rand() function by PHP, but we will soon be adding a "more" random function. Possibly use random.org or something similar.

As to proving fairness in picking the winner, we'd hope to do that through reputation and transparency on any part of our process. If you have any suggestions we'd be happy to hear them."