Someone with better technical chops than me, take a look. And follow this guy.
I came up with a protocol that I think allows a node to prune its utxo set and still count as a fully validating node. So I no longer think it's true that it has to be held in ram -- I don't think it needs to be held at all, though I think the more of the utxo set you "keep around," the faster IBD would be. https://gist.github.com/supertestnet/6aa3dbeb7cb749741c18ed9335a23a81
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