As someone who wants to make a turn-based (block-based) MMORPG here I find this very interesting, but I'm not 100% understanding what is being said here.

In order to verify integrity of every character, item, and gold-piece in the game, every node must have all the correct information and interpret it properly. If something goes wrong you have to fix it... that might require a replay? I guess? Not fully understanding what you are getting at here.