What is a blockchain validator?

A validator is a computer that checks transactions and adds new blocks to a proof-of-stake blockchain. It locks up tokens as a stake, earns rewards for doing the job well and can be penalised if it does not.

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What a validator does

Every few seconds a proof-of-stake network needs a new block of transactions. Validators propose those blocks, check the ones other validators propose, and vote on them. When enough of them agree, the block becomes permanent.

What it takes to run one well

Running a validator is a 24-hour job. A good operator needs:

  • Reliable servers in professional data centres, with backups.
  • Monitoring that alerts an engineer the moment something goes wrong.
  • Careful key management, so the validator can never sign two conflicting blocks.
  • Upgrades applied on time when the network releases new software.

The active set

Many networks only let a limited number of validators produce blocks at once, ranked by how much is staked with them. This group is called the active set. A validator outside it earns nothing, so staying in it matters.

How Evernodes fits in

Evernodes is a validator. We run enterprise-grade validator nodes across networks such as Ethereum, Cosmos Hub and Polkadot, keep them online and in the active set, and publish their addresses so anyone can check them on a block explorer.

Questions people ask

Can anyone become a validator?
Technically yes, but it requires the minimum stake, professional infrastructure and constant monitoring. Most people delegate to an established validator instead.
What happens if a validator goes offline?
It stops earning rewards while offline, and on many networks a long outage triggers a penalty that the validator and its delegators share.