With the current system, the passport chip can be validated offline if you have the CAs cached. If your computer is completely dead, you can look at the documents under a UV light and verify authenticity the old fashioned way. You could definitely design something that was verifiable offline using phones, but you’d be harder pressed to have it verifiable without any tech whatsoever.
Exactly this when I said in another comment I want both. The old physical protection of UV light and verify authenticity the old fashioned way. It doesn't even need a stamp but a physical thing that prove my identity I can own. Not another number in the system.
This is the same thing I am against a cashless society where the society no longer accept physical cash. And in 2012, and later 2014 when Apple Pay was introduced all the way to 2017, 99% of HN were in support of getting rid of physical cash.
In times of disaster, the people welding paper along with the people who can trade on their street cred, familiar friends, family, will get stuff, do necessary business.
Everyone else will be essentially panhandling.
Mind you, not a damn thing wrong with panhandling. That is not a crime.
My point is to avoid having to do that where possible and practical.
