http://www.trsst.com/
Seems like a pretty good idea, and it is an all open standard. They are having a Kickstarter currently:
http://www.kickstarter.com/projects/190 ... -for-the-o
Here is an article on wired:
http://www.wired.com/wiredenterprise/2013/08/trsst/
Also interesting to note is that it will include a background integration of crypt-currencies (bitcoin etc.), so that could ease adoption of these (although I am personally skeptical if you even want something like that... but that's another topic).