What Is a Validator in Blockchain?
A validator is a node in a Proof of Stake blockchain that participates in confirming transactions and producing new blocks. Validators stake the network’s native token as collateral, and in exchange they earn staking rewards. They are the operational backbone of networks like Solana, Ethereum, and Cardano.
What Validators Do
Validators receive transactions broadcast to the network and check that each one is valid: correct signatures, sufficient balance, no double spends. On networks like Solana, one validator is selected per slot as the leader to bundle transactions into a block and propose it to the network. Other validators vote on that proposal. If a supermajority of stake-weighted votes confirm the block, it is added to the chain. Reward distribution is recalculated at the end of each epoch.
Running a Solana Validator
Solana validators require high-spec hardware and a fast, low-latency internet connection because of the network’s throughput demands. There is no minimum stake requirement to run a validator, but validators with little delegated stake earn fewer rewards and may not cover their operating costs. Most validators rely on stake delegated to them by token holders who want to earn rewards without running their own node.
Validator Economics and Slashing
Validators earn block rewards and a portion of transaction fees proportional to their stake weight. On networks that implement slashing, validators who behave maliciously (double-voting, long periods of downtime) risk having a portion of their staked tokens burned. This makes dishonest behavior expensive and gives delegators an incentive to choose reliable, well-maintained validators.
FAQ
A validator checks the validity of transactions and participates in producing and confirming new blocks on a Proof of Stake blockchain. Validators stake tokens as collateral and earn rewards for doing this work honestly.
Look for validators with a long uptime history, reasonable commission rate, and sufficient stake to stay in the active set. Tools like validators.app and the Solana Explorer show per-validator performance and commission data.
Slashing is a penalty where a validator loses part of their staked funds for breaking protocol rules, such as signing conflicting blocks. It makes attacks costly because the attacker forfeits their staked capital.
Yes. On Solana, you can delegate your SOL to any active validator and earn staking rewards proportional to your stake, without running any hardware. Your tokens stay in your wallet and can be unstaked after a cooldown period.
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