Definition
Proof of stake (PoS) is a family of blockchain consensus designs in which validators commit assets rather than compete primarily through proof-of-work hashing. Stake influences participation according to each protocol’s rules. The label does not describe one universal voting system, reward schedule or withdrawal process.
How It Works
Validators perform duties such as proposing blocks and voting on chain history. Rewards can encourage correct participation, while penalties may discourage missed duties or conflicting messages. Some protocols slash stake for specified misconduct. Delegation and pooled staking let users participate indirectly in certain systems, but add operator or contract dependencies and may not be native protocol features.
Key Considerations
PoS generally avoids the competitive computational search of mining, but lower energy use does not remove economic or technical risks. Security depends on stake concentration, consensus assumptions, software and incentives. Staking rewards are not guaranteed investment returns: token prices, fees, penalties and withdrawal constraints affect outcomes. A product called staking may follow different rules from directly operating a network validator, so its actual structure must be examined.