A node is any computer that keeps a copy of the blockchain and verifies the rules. A validator is a node that also participates in producing blocks, which on a proof of stake network requires locked capital. How many validators exist and how evenly stake is distributed among them is the most useful measure of how decentralized a network actually is.
Nodes come first
A full node downloads every block, verifies every transaction against the rules, and keeps its own copy of the chain. It takes nobody's word for anything.
Running one is how you stop trusting third parties entirely. Most people never do, and the fact that anyone can, cheaply, is a large part of what keeps a network honest.
| Type | What it does | Who runs one |
|---|---|---|
| Full node | Verifies everything, stores recent state | Anyone who wants to verify independently |
| Archive node | Stores complete historical state | Explorers, analytics services, developers |
| Light client | Verifies headers and asks others for detail | Wallets and mobile applications |
| Validator | Verifies and also produces or attests blocks | Stakers, with capital at risk |
What a validator does
Stays online and in sync
Downtime means missed duties and reduced rewards. Reliability is most of the job.
Attests to blocks
Votes on what it believes is the correct chain head. This happens constantly.
Occasionally proposes a block
When selected, assembles transactions and publishes. Selection is proportional to stake.
Has capital at risk
Provably bad behavior, such as signing two conflicting blocks, results in slashing.
Why the count matters
Validator count and stake distribution are the most honest available measure of decentralization, and they are publicly checkable rather than marketing claims.
| Question | Why it matters |
|---|---|
| How many validators? | More independent operators means more parties would have to collude |
| How concentrated is stake? | If ten operators control a third, that group can influence outcomes |
| Where are they hosted? | Heavy concentration on one cloud provider is a single point of failure |
| What jurisdictions? | Geographic spread affects resistance to coordinated legal pressure |
| What does it cost to run one? | High hardware requirements reduce who can realistically participate |
Choosing a validator to delegate to
- Track record. Uptime history and whether they have ever been slashed.
- Commission. The cut they take. Very low can signal a loss leader that will rise later.
- Size. Delegating to the largest operator adds to concentration. Spreading across mid sized ones helps the network.
- Infrastructure. Operators who publish their setup and use diverse hosting are a better bet than opaque ones.
- Communication. An operator who posts updates and responds to issues is doing the job properly.
Common questions
Do I need to run a node?
No. Almost nobody does, and everything works fine without it. The point is that you could, and that enough people do to keep the network honest.
How much does it cost to run a validator?
Varies enormously. Ethereum requires 32 ETH plus modest hardware. Some chains require far larger stakes or much heavier hardware, which limits participation.
What happens if my validator goes offline?
You miss rewards for that period. Extended downtime carries penalties on some networks. It is not usually catastrophic, and it is why operator reliability matters.
Where to go next
Want to try staking safely?
We walk through what staking actually commits you to, what the real risks are, and how to do it without locking up funds you might need.