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[–] AinzOown ago 

https://coincenter.org/entry/what-is-bitcoin-mining-and-why-is-it-necessary

Ok, it sounds like they do that function, but the guessing the nonce part sounds like unnecessary work done to pick the winner of a bitcoin.

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[–] KoKansei ago 

It is necessary to prove that a certain amount of hashpower (work) was committed to finding the block, hence "proof of work"