This one seems to be the official one. I remember seeing two copycat sites before around here (24HoursPonzi.com and 24HourPonzzi.com).
Also about 15 hours left till the current round ends I see.
CLoudFlare is asking me to wait for 5 sec, but even after 50 sec of waiting, the site is not opening. Is it hosted on some free server ?
It's working for me. I think it was down for a while before though.