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![Proofs of work
Introduced by Dwork and Naor [Crypto 1992] as a
countermeasure against spam.
Basic idea:
Force users to do ...](https://image.slidesharecdn.com/1-160609181300/75/A-research-oriented-introduction-to-the-cryptographic-currencies-starting-with-Bitcoin-30-2048.jpg?cb=1667969806)
