Proof of stake, or proof of ownership (Proof of Stake, PoS), is a consensus algorithm that acts as an alternative to the Proof of Work method. At its core is the principle that the ability to create a new block and receive a reward depends on the number of coins a network participant owns and locks, rather than on the performance of their hardware.

A participant who holds and reserves a certain amount of cryptocurrency (this process is called staking) gets a chance to be chosen to confirm transactions and form a new block. The larger a participant's stake, the higher the probability that the system will choose them. This approach reduces the need for the energy-intensive computations characteristic of Proof of Work.

Advantages of Proof of Stake

• Substantially lower energy consumption;
• No need for expensive mining hardware;
• The economic interest of holders in the stability of the network;
• The ability to earn a reward for participating in validation.

At the same time, PoS has its own peculiarities: the concentration of large stakes among individual participants can affect decentralization. Many modern blockchain projects are built on this algorithm.