Download Bitcoin Proof Of Work PNG. Proof of work and mining. They solve mathematical puzzles (energy, time and gpu/cpu consuming).
Bitcoin proved that we don't need. In short, cryptocurrencies are what they are today because of these algorithms. As you can imagine, thousands of people use bitcoin, ethereum and other blockchains that use the proof of while bitcoin, which uses the proof of work model, awards a block reward every time a new block is verified, those who contribute to the proof of.
Proof of work was the first consensus algorithm to surface, and, to date, remains the dominant one.
Proof of stake works a bit differently. Why ethereum wants to use pos? Producing a proof of work can be a random process with low probability so that a lot of trial and error is required on average before a valid proof. In short, cryptocurrencies are what they are today because of these algorithms.