no matter the foundation of your currency, crypto or physical, gold or monero, fiat or bitcoin, the key to it being used as an effective medium of exchange is the ability of the person to accept that medium in exchange for whatever goods he wants. this means that in a restricted society at some point you will need to exchange whatever tokens you have for whatever else you need.

maybe im too thick or too much of a luddite, but i just dont see how a digital currency will ever be useful in a future underground society. Sure right now govt agencies and big banks are on the back foot of the emerging tech, but having digital fingerprints be left in exhanges, ledgers and miners does not sound like something thats safe long term.

the only way it will remain that way is a constant digital arms race of digital coins and govt tracking, in which case the currency that will protect us from CCP probably does not even exist yet.