What Role Do ‘Validator Nodes’ Play in a Staking-Based System?

Validator nodes are computers running the protocol software that are responsible for proposing, verifying, and attesting to new blocks in a Proof-of-Stake (PoS) system. They must have a required amount of cryptocurrency staked as collateral.

Validators receive rewards (transaction fees and/or inflation) for honest participation and face penalties (slashing) for misbehavior. They are the core infrastructure that maintains the security and integrity of the blockchain.