Chris Ping, you REALLY need to start understanding the blockchain concept. The fact that you think it could be a "trap" means you do not understand how the blockchain works. Once released, a blockchain is as autonomous, and anonymous as is possible. It was invented so the idiotic "trap" you are dreaming of, CAN'T HAPPEN.
OK, outside of your crappy American TV shows, when has an EM pulse ever eliminated ALL COMPUTERS?
You need TWO. TWO FUCKING MACHINES, and the ENTIRE BLOCKCHAIN CAN BE REDEPLOYED.
It's like you WANT to be ignorant so bad, you'll INVENT a problem. LOOK AT YOURSELF YOU STUPID PROGRAMMED DRONE!