Validators are participants in Proof-of-Stake (PoS) blockchain networks who are responsible for verifying transactions, creating new blocks, and maintaining network consensus. They play the same role that miners play in Proof-of-Work networks — securing the blockchain and confirming transactions — but instead of using computational power, validators stake (lock up) cryptocurrency as collateral to earn the right to validate.
To become a validator, participants must stake a minimum amount of the network’s native token. Ethereum requires 32 ETH ($96,000+ at $3,000/ETH) to run a solo validator node. Other networks have lower thresholds: Cardano and Solana allow delegation with any amount. Validators earn rewards (typically 3–10% annually) for correctly validating transactions. The key risk is slashing — if a validator behaves maliciously (e.g. attempts to double-sign transactions) or goes offline excessively, a portion of their staked ETH is automatically “slashed” (destroyed) as a penalty.
This economic penalty — the threat of losing staked capital — is what keeps validators honest. The more capital staked, the more costly an attack becomes, making large PoS networks highly secure. Users who cannot meet minimum staking requirements can participate through liquid staking protocols (Lido, Rocket Pool) or exchange staking, delegating their tokens to professional validators.
Example: An Ethereum validator stakes 32 ETH. They earn approximately 3.5% annually — about 1.12 ETH/year in rewards. If they go offline for extended periods, their balance is slowly penalised (inactivity leak). If they attempt to manipulate the network, up to 50% of their 32 ETH stake is slashed.
Learn more: Ethereum.org — Validators & Staking
