That's be nice. Bitcoin has not found a Debian maintainer for over a dozen years now, which is a shame because so much is downstream from Debjan.
This is the blog post the book came from. https://kadavy.net/blog/posts/zettelkasten-method-slip-box-digital-example/
Mixing zettlekasten with your tool of choice is a very personal choice and there's a lot of people suggesting workflows. It can get very complex very quickly especially if you add Getting Things Done. His makes a good start and is very close to what I use, except I use org-mode instead of markdown on emacs and mobile.
...then suddenly.
You could jump that wall on your right hand side and find someone to talk to someone about it.
Downside: keys could just disappear one morning.
I don't think Egyptians are more or less tech-savvy than people are in socioeconomically similar countries. They are just less free. Transacting in "virtual currencies" without prior permit is a crime in Egypt since the banking laws changes in 2019 (if I remember on the top of my head). It is also a country with very weak rule of law. Even before 2019, police would lurk on localbitcoins and entrap potential buyers, then charge them with money laundering.
Like everything Egypt related, finding good on-ramps is going to be a tough nut to crack. In the meantime, people are vulnerable to losing the vast majority of whatever wealth they had.
Energy density is useful for mobility, portability... The main factor here is Energy Return on Investment (EROI), perhaps the most important energy factor no one os talkong about.
Is this where... ...we came in?
Right. My first impression is this: there is something wrong if you have to enter your secret key in a device and if your device is compromised, so is your identity that you invested in. This is why PGP has subkeys and revoke certificates. Not sure if something like nostr could be made so you can resume your account with another subkey, but at least you should be able to revoke it.
Oh, well. Hello world. I guess.