You need six operating computers in the world to maintain the block chain. An EMP is not eliminating that. EMPs, as they work today, would take out a city. Or maybe a region (New England for example.). It’s not going to take out the nation. That is a pipe dream novelization of the real world possibilities.
I didn’t know so I asked.
Thank you for your answer!
For the record, I have gold and silver, but no cryptocurrency.