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.