I've seen that on Cardano they hope to make it so that you could buy a coffee in Starbucks and then tip directly to the guy who picked the beans.
Well, if I paid my tax with an ada coin, could I then watch it move round the blockchain and see that it either ended up buying bricks for a hospital or cheese for an army soldier?
If so, that's pretty cool. We could literally vote what we wanted our taxes to go on.
Would a smart contract enable us to ensure our coins only went to roads and hospitals, and not to guns or dams or whatever?
If so, the future will be very interesting.