Ok, can you be more specific what the data is holding? I feel like there is already some device that can assist with this. I think there might be a misunderstanding what persistent data is.
Persistent data would be data that persists beyond the game session. Like a permanent leader board that updates with every play session but always has the data that you store in it from all game sessions.
Shared data is data that is updated and shared between all the users at runtime. A lot of devices share data in a sense.