What is a validator in crypto? Proof of stake validators explained
A validator in crypto is a network participant in a proof of stake (PoS) blockchain who locks up coins as collateral to verify transactions and add new blocks. In return, validators earn staking rewards, and if they cheat or make serious mistakes, part of their stake can be taken away.
Validators do the job that miners do on Bitcoin, but with money at stake instead of computing power. When you “stake” coins on an exchange, you are usually lending them to a validator run by someone else.
What is a validator in crypto, in plain words?
A validator is a computer, run by a person or a company, that plays a crucial role in network security: it helps a blockchain agree on which transactions are valid. A validator node runs software that receives new transactions, checks that they follow the rules, and votes on blocks proposed by other validators.
What makes it a validator rather than an ordinary node is the stake. To take part, the operator locks a set amount of the network’s native token in a smart contract. That stake works like a deposit: honest validators earn rewards, while dishonest ones lose part of it.
The main jobs validators perform:
- Verifying transactions: checking signatures and balances, so nobody spends coins they don’t have.
- Proposing blocks: bundling valid transactions into new blocks when selected.
- Attesting: voting on blocks from other validators, which is how the blockchain network reaches agreement.
- Staying online: a validator that goes offline weakens the validation process and loses rewards.
How a blockchain validator works in proof of stake
Proof of stake (PoS) is the consensus mechanism behind Ethereum, Solana, Cardano and many other networks. It replaces the energy-hungry mining of proof of work with a system that is far more energy efficient.
Here is how validating transactions works on a PoS blockchain such as the Ethereum network:
- Stake. The validator deposits the minimum stake, 32 ETH on Ethereum, into the staking contract and joins an activation queue.
- Get selected. The protocol regularly picks one validator to propose the next block. The others check it.
- Propose blocks. The selected validator bundles pending transactions into a new block and shares it with the network.
- Attest. Many validators vote that the block is valid. Once enough votes are in, the block is final and can’t be changed.
- Earn rewards. Validators receive newly issued coins plus the transaction fees users add as tips.
Each validator has key pairs, each made of a public key and a private key. The validator keys are used to sign votes and blocks, while the withdrawal credentials point to the withdrawal address where staked ETH and rewards end up. Losing the withdrawal key, like losing any private key, can mean losing access to the funds.
Validators vs miners
Validators and miners both secure a blockchain, but they put different things at risk. Miners spend electricity and expensive hardware to compete for each block; validators put up a financial commitment in the network’s own coin.
| Miner (proof of work) | Validator (proof of stake) | |
|---|---|---|
| What’s at risk | Hardware and electricity | Staked coins |
| How blocks are added | Racing to solve a puzzle | Selected by the protocol |
| Penalty for cheating | Wasted energy | Part of the stake is slashed |
| Example | Bitcoin | Ethereum |
Bitcoin still uses proof of work, so it has miners, not validators. Ethereum switched to proof of stake in 2022.
Slashing, active validators and the exit queue
Slashing is the penalty for malicious behaviour, such as signing two conflicting blocks for the same slot. That would let an attacker try to double spend, so the protocol removes part of the validator’s stake and forces it out of the network. This protects the network from malicious activity by making any attack expensive. Our entry on slashing covers the slashing conditions in more detail.
Smaller penalties apply to active validators that go offline: a validator that misses its duties slowly loses rewards. That’s why running validator nodes takes technical expertise and a reliable connection.
Leaving isn’t instant either. On Ethereum, validators that want to stop join an exit queue, and withdrawals follow once they reach the front. When many validators want to leave at once, the wait gets longer and you can’t sell those coins in the meantime.
Running validator nodes: how much ETH do you need?
To run a single validator on Ethereum yourself, you need 32 ETH. Say ether trades at €3,000: that’s €96,000 locked up, plus your own hardware and the time to maintain it. Since 2025, one validator can hold more than 32 ETH, up to a maximum effective balance of 2,048 ETH, but 32 ETH is still the minimum to start.
Most people don’t come close to that, which is why staking pools and exchanges exist. They combine deposits from many users, run many validators, and pay out a share of the rewards.
Four ways to earn rewards with validators
You can take part in staking at four levels, from full control to full convenience:
- Solo staking: you run your own validator on your own hardware. You keep all rewards but carry all the technical and slashing risk.
- Delegation: on networks such as Solana and Cardano, you assign your coins to a validator of your choice and share its rewards, while the coins usually stay in your own wallet.
- Staking pools and liquid staking: staking tokens through a smart contract that pools many small deposits and gives you a token that represents your staked assets. This adds smart contract risk on top of validator risk.
- Exchange staking: the platform holds your coins and runs or picks the validators. It’s the simplest route, but you rely completely on the platform.
Staked ETH on an exchange: a worked example
When you stake through an exchange, the exchange runs the validator node for you and keeps a commission on the rewards. Coinbase, for example, keeps a standard commission of 35% of staking rewards on assets such as ETH, SOL and ADA.
Rewards come from the network’s economic model: newly issued coins (block rewards) plus the fees users pay, with additional rewards for validators that propose blocks. The platform collects them and handles the reward distribution to users.
The sum is simple. If the ETH you stake earns €10 in rewards over a period, Coinbase keeps €3.50 and you receive €6.50. The commission comes out of the rewards, not out of your original stake.
Before you stake on any platform, check three things:
- Commission: what share of the rewards the platform keeps.
- Lock-up: how long it takes to get your coins back, including the network’s exit queue.
- Regulation: whether the staking product is covered by the platform’s licence. Bitvavo states that its staking and lending products are not regulated under MiCA, even though the exchange itself is MiCA-authorised.
Why validators matter to you in the EU
Validators matter to you whenever you hold or stake proof of stake coins, and three EU points stand out:
- Staking isn’t protected. Staked digital assets aren’t covered by investor compensation schemes such as the Dutch one. If the coin’s price falls or a provider fails, nobody reimburses you.
- Rewards can be taxable on receipt. In Germany, staking rewards count as other income in the year you receive them, with a €256 exemption limit. In the Netherlands, staked coins and rewards count towards your box 3 assets.
- Use a licensed platform. Since 1 July 2026 only MiCA-authorised providers may offer crypto services in the EU. Check the licence, then check whether the staking product itself falls under it, and do your own research on how the platform picks its validators and protects their security.
The bottom line
A validator is the proof of stake version of a miner: it puts coins at stake to confirm transactions and earns rewards for doing it honestly. Running one yourself takes 32 ETH and real technical skill on Ethereum; staking through a platform is easier but adds commission, lock-up and provider risk. Know which of those you’re accepting before you stake.
Related terms
Questions people ask
How do you become a crypto validator?
To become a validator you need the network's minimum stake, a computer that runs the validator software around the clock, and the technical skill to keep it secure and up to date. On Ethereum, a solo validator needs 32 ETH. Most people instead stake through an exchange or a staking pool, which runs the validator for them.
Do validators get paid in ether?
Yes. On Ethereum, validators receive rewards in ETH, made up of newly issued ether and the priority fees users add to their transactions. If you stake through an exchange, it pays your share of those rewards in ETH, minus its commission.
How much do crypto validators make?
It depends on the network, the total amount staked, the validator's uptime and the price of the coin, so there is no fixed figure. Rewards are paid in crypto, so their value in euros goes up and down, and a staking provider keeps part of them as commission.
Is BTC proof of stake?
No. Bitcoin uses proof of work, where miners compete with computing power to add blocks. It has miners, not validators.
Is staking with a validator risky?
Yes. The coin's price can fall, a validator can be penalised (slashed) for mistakes, your coins may be locked for a while, and staking products on exchanges are not covered by any investor compensation scheme.