Quantum-resistant blockchains

We are lucky enough to be living at the exact time that AI and quantum computing will impact the world dramatically.

I have no idea what a post-AGI or post-quantum computing world will look like; the advancements (especially in conjunction) will be so exponentially massive I suspect it'll be completely alien to us. We can't even be sure we have a place in this new world.

That being said, in case we haven't been obliterated into the technological ether, and we still need blockchain-based currency, what are some cryptocurrencies we could use that is secured by quantum cryptography?

Will Bitcoin and Ethereum be quantum resistant?

A few articles online talk about a possible hard fork for Ethereum to allow it to be quantum resistant – how likely is this to happen?

Are there any extant blockchains right now that are quantum resistant?