What about a rings of trust system? Tap your phone to someone you know etc, and your devices know to trust each other. Add a level of trust to that, so the apps

What about a rings of trust system? Tap your phone to someone you know etc, and your devices know to trust each other. Add a level of trust to that, so the apps can act accordingly. Also, make it so messages can be stored until a PtP or relay over internet can be done.