Once I searched how Japan do the synchronization of the data in the IC card because I can't imagine how they handle all of the traffic for millions of people especially in the rush hour.
So the solution is the transportation card is writable, and each train station acts like a small data center. They sync the data periodically to the main data center.
I think the syncing tech is getting better, Japan train companies are going to experiment with QR code soon. So read only is feasible.
So the solution is the transportation card is writable, and each train station acts like a small data center. They sync the data periodically to the main data center.
I think the syncing tech is getting better, Japan train companies are going to experiment with QR code soon. So read only is feasible.