Or how about a functioning government with minimal corruption for starters? clean water? a functional banking system? access to education? UBI is putting the cart before the horse

Well of course, that's what I'm saying, just taking away jobs for miners doesn't do that.

How do you implement UBI without any centralized government and in some cases a functioning currency?

Charities like GiveDirectly do it using various mobile baking programs along with physically driving shipments of cash to remote areas that don’t have phone access. It’s a complicated problem that involves a lot of human time but it’s also a mostly solved problem.

https://www.givedirectly.org/ gives a basic income to poor people. It's not universal.