No Worries, Make a Homemade Faraday Cage,
Place a Laptop inside , Laptop has been modified to run off of a Lithium Battery Bank instead of a single battery.
Solar Panels are inside the faraday cage with the laptop and DC battery bank,
No electrical wires come thru the cage, in fact , you use Fiber optic cables to connect you to the internet, so only light comes thru those cables.
And only the fiber optic cables run thru the faraday cage.
Reason for the solar panel is have some high power lights above the cage that shine on the solar panels keeping the battery bank charged.
Optional :
Solar Panels & battery banks could be replaced with small gas generator, however
area has to ventilated to keep the fumes from killing you.
FYI:
If the Big EMP hits , personally going to worry more about Heating & Cooling, Electricity , Shelter , Food & Clean water,
Oh, and those pesky Zombies, than the blockchain.