In plain English
What Validator means
Validators are the nodes that help a proof-of-stake blockchain decide which transactions are valid and what the next block should be. They usually stake tokens as economic backing for honest behavior. If they follow the rules, they may earn rewards; if not, they can face penalties.
Why it matters
Validators are central to consensus, finality, and network security. Their uptime, hardware setup, and honest participation affect whether the chain keeps processing transactions smoothly. For users, the term matters because staking services, node operators, and exchanges may all describe different roles as “validators.”
Example
On a proof-of-stake chain, a validator receives candidate blocks, checks them, and signs an attestation confirming that the block follows the rules. Another validator may later be selected to propose the next block. This example is simplified and chain-specific details differ.
Quick answers
Common questions
Do validators mine blocks?+
Not in proof-of-stake systems. They validate and attest using staked capital rather than proof-of-work computation.
Can a validator be run by a service provider?+
Yes. Many users stake through operators or platforms that run validator infrastructure on their behalf.
Sources