I'm currently taking part in this competition with a couple friends (gentleman's "see who can win the most with .01" agreement) and was long during the rise, which was quite fun. I didn't want to tell anyone else about it because I wanted to win the prize all to myself, but I figure the trollbox would be more fun with some people in it .

However, this exchange is still new, and I would caution against using 50x leverage (I usually never go higher than 30x), with the way the order books move around I think it could be possible to get margin called when the price moves and they are refreshing the books if no humans have orders to protect that zone during the shift. I talked to the admin and they said this will soon be fixed, hopefully this week.

Full Disclosure: The owner of this website is a friend of a friend, and I believe it to be trustworthy.