[tinco]

For M-Pesa you also need mobile phone coverage, I think if the only way to get to a place is by canoe, then there's probably no cellular coverage either.

I was just thinking how impossible it seems to get internet covered over the green heart of Africa, but perhaps that's just not the solution (right now). Perhaps a cryptographic sneaker net would work.

If the accountants travel with RFID powered 'credit' cards pre-authorized to ID's then they themselves don't have to bear any risks. The only thing you need then is to supply every village with a RFID reading trading platform (could be a phone or a laptop) to enable digital trades.

[motoboi]

Google loons seems to attack this problem by having high altitude ballons that drift on the wind, but can keep their approximated position using air currents.

By not using a wired backhaul, seems possible to get to those remote areas.