Idea for a new linking system.

This idea will help to link an account from mobile or pc or vice versa so the idea is when you change the profile in the game there will be a button that says link with user id, every player has their own user id found in setting after that you input your user id into the other device and it will start to link the accounts however people can hack and see players id but it will send a verification id in game to the player. so yeh