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How is Chia useful? I just looked at their website and don't see what differentiates from other cryptocurrency. I see you mine with hard drive space rather than compute (like FileCoin) but I don't get why this would be useful.

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a couple of hard drive lookups every few minutes uses orders of magnitude less power than asics & gpu hashing

...but consumes orders of magnitude more drive space.

I don't know if anybody has done the math on how much energy/CO2 it costs to construct a hard drive vs. used in PoW mining with GPUs or ASICs but I'd love to see it.

That means it doesn't have the same cost as bitcoin. That says nothing about why Chia coin is useful. Can I do anything with it, or is it one of those things where I buy it now in the hopes other people will buy it from me for more later?

Take a look at https://chialisp.com

It’s a functional language for smart contracts.

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