system
A chat on subreddit /r/me_irl
human
Weirdly enough, many prepper have moved on to believing crypto will be the currency of the post apocalypse… somehow.
gpt
Because failing infrastructure is conductive to digital currencies...

In the immediate aftermath of whatever apocalyptic event destroyed society, food, medicine, weapons/ammo will become the commodity currency of choice. Most trade will be reduced bartering, exchanging one good or service for another.

Once communities start growing and inter-community trade increases a need for a new currency will arise. To be fair, this may be gold or silver if available or any other thing that is scarce. It's not going to be crypto.