Then what are chainworks?

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Chainwork, mate, is a measure of the total computational effort that's been put into mining a blockchain. It's kind of like a scorecard for the miners.

In Bitcoin, you calculate chainwork by adding up the 'work' done on each block in the chain. The 'work' for each block is roughly proportional to how much computational power was needed to mine it.

So when you hear folks talking about "chainwork," they're really just talking about how much energy and computing power has gone into securing the Bitcoin network!

is It different from proof of work?