Hey there,
I like your idea but doesn't Mycelium have a similar feature?
Where it will tell you how much miles away the seller is..maybe you want to do something more dynamic.
It would only work for cash exchanges?
Do mycelium really have this feature never tried them before but have heard about mycelium lots of time.
Gonna try this, as in here it is hard to find another bitcoiner living near us, does they also show the user near you who is just using mycelium wallet?