Slightly off-topic: with currency being mostly digital and now crypto-currency being more common, it'll be interesting to see what happens in the event of a massive power failure (e.g. coronal mass ejections, mega-earthquakes, super-hurricanes, etc.). I imagine if you had a bank statement as support, you could at least withdraw money from the bank in the form of cash. Where with crypto you don't have that potential safety-net and any mining operations will take a huge hit, possibly causing catastrophic volatility in its worth.