The problem is you can only really trust for that exact point in time. I trust you from now until forever is a horrible model. Look at problems we've got with

The problem is you can only really trust for that exact point in time. I trust you from now until forever is a horrible model. Look at problems we've got with Certificate Authorities now to see a good example. Plus think what kind of a target someone like valve becomes when all you have to do is get no their system for 1 second to charge all accounts £15. If you want something like that I say leave it to services to add their own wallet. If you trust them with a couple hundred the steam wallet it's the same thing.