> The “work” element in Proof-of-Work mining directly refers to a hashing problem. > The goal in Proof-of-Work is to find a hash that meets the criteria for a

> The “work” element in Proof-of-Work mining directly refers to a hashing problem. > The goal in Proof-of-Work is to find a hash that meets the criteria for a new block. The "hashing problem" is a specific choice of Proof of Work algorithm known as Hashcash. There are other possible Proof of Work algorithms [1] that are more like solving a jigsaw puzzle, like the Cuckoo Cycle problem that looks for fixed length cycles in random graphs. [1] https://en.wikipedia.org/wiki/Proof_of_work https://en.wikipedia.org/wiki/Proof_of_work