I have considered the possibility of a communications/internet blackout and its potential effects upon the crypto world. At one point I tried to stir up some interest in running Hive transactions over AMPRNet (Amateur Packet Radio Network or what is also called 'Network 44') but no one seemed interested in it. There are a ton of IP addresses available for it also. They are 44.0.0.0/9: For USA subnets and 44.128.0.0/10: For the rest of the globe. All available via HAM!
The one item I try to recommend to folks for 'prepping' is a hand (or foot) powered device for recharging batteries and/or battery banks. K-Tor produces some nice ones if you are ever interested in looking at them.
I am not much of a prepper myself given that I took Terence McKenna's advice long ago and mostly 'live as if the apocalypse has already happened' but that said... the biggest factors are psychological ones and having some routines (especially with rationing supplies and maintaining morale) already in place long before any 'weird stuff' happens.
I used to love telling people who mentioned 'survival' or anything along those lines... that when living in a dangerous scenario... or one where resources are a scarcity: Survival better be a fucking habit.
I'm brand-spanking new to the ham radio scene and am still learning more about it. That community seems to have a similar ethos as the burgeoning crypto community, with a strong sense of independance and a willingness to help others that will come in handy when the SHTF.
I just bought a well-regarded app to help prepare for the test, once I bone up on this thing and get around to taking it. I do have a small solar panel that I was testing out to power devices such as a phone, etc. But it takes quite awhile to get anywhere with it unless you have more serious gear. But I do like the idea of having more human-powered devices around just in case.
I'm aware of that "Rule of Threes" saying: "3 minutes without air, 3 days without water, 3 weeks without food..." However here at least, people are so not ready, and simply assume that the government will somehow be able to bail everyone out. They have no thought of planning for the future and laugh at anyone who does.
But that's OK. My attitude towards them is "you do you" and I'll just keep on truckin.