A crypto validator is a participant in a proof-of-stake blockchain. Validators help confirm transactions, propose or attest to blocks, and keep the network rules enforced.
How validators are chosen
Validators usually stake coins or receive delegated stake from users. The network then selects validators according to its rules, which can include stake amount, randomness, reputation, or performance.
Validator rewards and penalties
Validators may earn rewards for honest work. They may lose rewards or suffer slashing penalties if they go offline, double-sign, or behave maliciously.
Users who delegate stake should look at validator fees, uptime, reputation, and network rules before choosing where to stake.