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I recently learned that proof of work was actually invented long before Bitcoin to combat spam, but the idea didn't take off, sadly:

https://en.wikipedia.org/wiki/Proof_of_work

https://en.wikipedia.org/wiki/Hashcash

https://scottpeterjohnson.github.io/hashwall/dist/index.html



Our luckily, given the way it worked out with crypto.




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