Overview
A validator is a network participant responsible for confirming new transactions and adding them to a blockchain, typically in a proof-of-stake system. Validators are selected based on the amount of cryptocurrency they stake, and they are rewarded for producing and attesting to valid blocks. Misbehavior can be punished by slashing a portion of the staked funds.
How It Works
Validators lock up a minimum stake in the protocol to be eligible. The network then selects validators to propose blocks and to attest to the validity of others' proposals, with selection weighted by stake. Rewards accrue over time for honest participation, while penalties, including slashing, apply to going offline or signing conflicting blocks. The stake acts as economic collateral that aligns validator behavior with network health.
Why It Matters
Proof-of-stake validation secures a network through economic deterrence rather than energy consumption. It is more accessible than mining in some respects, but it still requires technical diligence and financial commitment. Validators are also the point of failure for slashing risks, which is why many users prefer delegated staking through services that manage the operational burden.
Related Concepts
Validators are the participants behind Proof of Stake and are accountable through Slashing. Token holders who do not run nodes themselves can contribute through Delegated Staking, and liquid staking derivatives allow staked positions to be used elsewhere.