Validator

A validator is a participant in a proof-of-stake network that helps produce and confirm blocks. To become one, an operator runs node software and locks up a stake in the chain's native coin. That stake acts as a security deposit: it gives the validator voting weight and gives it something to lose if it cheats.

In each slot or round, the protocol selects a validator to propose a block, and others check it and vote, or attest, that it is valid. Honest work earns rewards from new issuance and transaction fees. Breaking the rules, for example signing two conflicting blocks, can trigger slashing, where part of the stake is destroyed. On many chains, ordinary holders can delegate coins to a validator and share its rewards without running hardware themselves.

For holders, validators matter in two ways. They are the backbone of the chain's security, so a small or concentrated validator set means more risk of downtime or censorship. And if you stake, your returns and some of your risk depend on the validator you pick: its commission, uptime, and history of penalties. Validators can also reorder transactions within their blocks, which links them to MEV and to the sandwich trades that affect DEX users.

If you delegate, spread stake across reliable, independent validators instead of always choosing the biggest. Check the commission rate, uptime, and whether the validator has been slashed. Understand the unbonding period, since unstaking can take days or weeks. Be careful with services promising unusually high staking yields, which often hide extra risk or are simply scams.