It’s called Proof of Stake (as opposed to Proof of Work) and there are multiple implementations working already and Ethereum will migrate to PoS next year.
PoS is conceptually more complicated (block producing is assigned to nodes with staked currency and there are multiple validation techniques) but requires very little CPU power.
PoS is conceptually more complicated (block producing is assigned to nodes with staked currency and there are multiple validation techniques) but requires very little CPU power.