You take everything because disk is the cheapest resource (also frees up RAM for the actuall chain), and mining is what determines what goes in so, if you have literally EVERYTHING, you as a miner do the filtering.

Paired with Stratum V2 or Datum, this means there is a truly decentralized immutable way of CHOOSING what you want your proof of work to put on chain.

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The chain cannot fit in RAM

Lol, I'm telling you that the architecture is wild but using self-validated "checkpoints" as they call them, you can fit the highest chain on RAM. (The guy was using 128G of RAM) but yes, they did.

Libbitcoin is intrguing and I one day hope to study it

Amir taaki and Eric Voskuil are mad men but it's a very interesting project.