End users preferring using mobile more over desktops is also a problem as vendors and buyers will only be using this currency for shielded tx’s and I have yet to come across a port running on ARM crunching 4 GB for a single tx; only alternative is to use a third party server to complete the tx and even that then open’s users to inherent risk.
This idea goes on the direction of giving a partial solution to that problem. The user can securely make zcash transactions (both shielded or transparent) from an android phone without need of trusting any thirthd party server… with the condition of leaving his computer running at home.
It is just a proof of concept for the moment; but it works.