What would actually happen if thousands of bitcoin servers were disconnected from each other for an extended period of time? How would you reach consensus if smaller networks continued to trade during the off period? A fragmented network should allow for double spending no?
I think that’s not the scenario for a Carrington Event, let alone something ten times as bad, for example. More like, if all electrical grids and transmission lines caught fire, how long would anyone care about your saved files?
you can look up "blockchain netsplit" for a longer explanation, but in short: once reconnected, the longest chain would become the consensus chain, and transactions on the other chain would be unconfirmed.