Hello,
I was looking for a recent and legitimate bitcoin doubler,
https://x2bit.com has paid me 0.02 (altogether 2.4 btc) btc so I will continue to win with small amounts until it falls.
The system works because there are many users depositing, then it takes a long time for the system to fail, just try with a small amount like me.
https://x2bit.comGood luck everyone!