For doubling bitcoin best website is coince.com they gives 180% in 60 days and I had got full payment for 2 sessions but i can guarantee when they will run away (as no mining site 100% trusted) still i suggest you invest there because you could earn some extra till the company last
Coince?, the site is not paying, it is dead, can you show a recent payment proof?
I am also looking for that. There are no proofs that this site is paying. I have seen some and they are all fake just edited from photoshop. I want to see the real one. Hell, I hope he can provide if he really is into advertising it.
you should never go to these sites in the first place.
they are all bad and waste of time. they show you all kinds of proof in the start to hook you up and take your time and/or money and then after they reached their goals they run away.