Hello!
Does this game ought to have AI players? I have friend, who wrote poker game, playing with player. It was quite nice application in c/c++. We were thinking about simillar application online, but it is needed a concession, so we gave up. Currently i have done employers/employees portal in GRails and recently Big virtual administration system using angularjs& .NET. As i see project needs to have some basic features at beginning, which of course may change later. For this money, I can do a web app, on which you can play texas hold em and receive send bitcoins. But it's up to You with legal issues, concessions and so on.
I don't know how graphical style is necessary and which platforms ( if Android iOS Too, then i have experience creating mobile puzzle game with payments for Android ). And regarding bitcoin, my friend did quickly quiz app with bitcoins, so it would be simple.