I'm going to go out on a limb here and say that fiat currencies are not inheritly evil.
Rather the people who control the currency and inflate with reckless abandon without respect or concern for those who hold the currency that are evil. The rules have to be written in stone... or backed by gold.
And there is nothing I can think of that will provide something more stone-like than a extremely strong hashing algorithm.
So long as the rules are written in stone and cannot be changed, we are far safer.
So we have a State that says "use this paper as money or we will be unhappy."
if you don't do it, they will then order you to do it.
If you still don't do it, they will arrest you.
If you resist arrest, they will shoot you.
If you go to prison and try to escape, they will shoot you.
Meanwhile, they print more money, robbing you of purchasing power.
That's not evil? That's not inherently evil?