my thought is that if zombie apocalypse ever became non-fiction then we would be in a world that will have activated nuclear weapons shortly after... and once nukes are flying no I dont think crypto survives... nor really anything electric communication based.

high atmospheric nuke explosion is like a super emp and the changes to atmospheric conditions (ash, radiation, and violent weather) is going to wreck havoc on all radio based communication.

maybe it survives on some shielded machine in a bunker in NZ, but the question will then be what is its value to anyone when currency defaults back to a standard built on water, food, radiation tabs, and weapons.