Sorry I had to disable log in for a few hours. http://xbtcontracts.org was attacked by a malicious user. The attacker affected his own row in the database to increase his balance to several thousand bitcoins in an effort to trigger payouts. I disabled log ins and new registrations until the flaw was found and fixed. Payouts are always performed manually for security.

Once the exploit was repaired I restored the website from backup. Log in and registration are now enabled.
Regular off site back ups of the website and all user data are made regularly so that in the event of an attack such as this one the website can be restored as it has.

Also I would like to announce that I have added a new feature. Now when you refer a new user, http://xbtcontracts.org will show you their http referrer on your referrals page. This will help you to see where your sign ups are coming from and in turn help you to build more successful referral campaigns.

EDIT : one more thing to fix - log in will be enabled once I have made the fix and i will remove this edit. FIXED.