Honestly, some deals are always too good to an extend that you can easily spot them as being a scam. I am just wondering if it is really possible for you to get the coins in the 71 hours. Doubling the bitcoins to me is something they are lying. It is very costly just to mine a mere coin and then waiting for 72 hour and it has doubled? Just be careful guys. This is the time when people want to snatch the little coins you have spend months accumulating. People are not sleeping even when you see the bitcoin doing fine.