Proof Of Stake

Proof of stake (PoS) protocols are a class of consensus mechanisms for blockchains that work by selecting validators in proportion to their quantity of holdings in the associated cryptocurrency. Unlike a proof of work (PoW) protocol, PoS systems do not incentivize extreme amounts of energy consumption. The first functioning use of PoS for cryptocurrency was Peercoin in 2012. Other uses have followed, and the Ethereum Foundation has announced a plan to switch Ethereum from PoW to PoS within 2021. https://en.wikipedia.org/wiki/Proof_of_stake