What is a Proof-of-stake?

Proof-of-stake (PoS) is a category of consensus algorithms for public blockchains that depend on the validator's stake in the network. In contrast to PoW algorithms, where participants are rewarded for solving cryptographic puzzles to check and confirm transactions in order to create a new block (see Mining), in public blockchains based on PoS, the set of validators alternately offer new blocks and vote for them, and the weight of each vote directly depends on the size of a deposit of a voter (stake). Advantages of PoS are greater security, reduced centralization and energy efficiency.