A validator is a computer that checks transactions and helps decide what goes into the next block on a Proof of Stake blockchain. To earn that right, validators put up collateral. Behave honestly, and they earn newly issued tokens; cheat, and the network destroys part of that collateral. By mid-June 2026, Ethereum had more than 1.24 million validators securing roughly 39.7 million staked ETH.
What a validator actually does
Three jobs, repeated every few seconds. The second is most of the work.
Propose blocks. Every so often a validator is selected to assemble the next block from pending transactions and broadcast it.
Attest to blocks. Far more often, validators vote on whether blocks other validators proposed are valid. This is the bulk of the work.
Stay online. A validator that is not running cannot attest. Missed attestations cost money.
Partly random, selection is weighted by how much is staked. More stake means more turns proposing, which is why large operators earn proportionally more.
Validators vs miners
Same job. Paid for differently.
On a Proof of Work chain, a miner competes by burning electricity. Whoever solves the puzzle first adds the block. To attack the network means out-computing everyone else.
On a Proof of Stake chain, a validator competes by putting capital at risk. Weighted by stake rather than computing power, selection works differently. To attack the network means acquiring enough stake and then losing it.
| Validator | Miner | |
|---|---|---|
| Chain type | Proof of Stake | Proof of Work |
| Requirement | Capital locked as collateral | Hardware and electricity |
| Selection | Partly random, weighted by stake | Whoever solves the puzzle first |
| Penalty for cheating | Stake destroyed through slashing | Wasted electricity |
| Energy use | Minimal | High by design |
| Networks | Ethereum, Solana, Cardano, Avalanche | Bitcoin, Litecoin, Dogecoin, Monero |
What it takes to run a validator
On Ethereum, 32 ETH and a machine that stays online. That is it.
By modern standards the hardware is undemanding: a reliable computer, a stable internet connection, and enough storage for the chain. What it actually requires is uptime. Offline during its assigned duties, a validator misses rewards and accrues small penalties, and those add up across weeks.
Requirements differ by network. Considerably. Setting no fixed minimum stake, Solana expects considerably more capable hardware, which is part of why it has around 800 validators against Ethereum's 1.24 million.
That comparison is worth reading carefully. Counting validator slots rather than people or machines, Ethereum's figure reflects that one operator can run thousands. Comparing the two figures directly overstates how different the two networks are in terms of who actually participates.
Slashing, and what really triggers it
Slashing is narrower than most people assume. The distinction matters if you are deciding whether to run one.
Slashable offenses are protocol-level attacks: proposing two different blocks for the same slot, or signing two conflicting attestations. These cost a meaningful share of stake and force the validator out of the network.
Not slashable is ordinary downtime. A validator that goes offline misses rewards and pays small inactivity penalties, and keeps its principal.
Slashing events on Ethereum have been rare, and most have come from misconfiguration rather than malice. Running two copies of the same validator at once, thinking one is a backup, is the classic way to slash yourself accidentally.
Four ways to participate in staking
- Solo staking. Run your own validator with 32 ETH. Full rewards, full responsibility, real technical work.
- Liquid staking. Deposit any amount with a protocol like Lido and receive a tradeable token representing your position, at a fee and with smart contract risk.
- Exchange staking. The platform runs validators on your behalf. Simplest, lower yield, counterparty risk.
- Running as a service. Pay an operator to run a validator you fund, keeping the stake in your own name.
Each moves the work and the risk somewhere different. Neither disappears.
What validators earn
Less than most people expect. By mid-2026, native Ethereum staking returns had compressed to around 2.78% annually. Adding roughly 10% to 30% on top, MEV rewards take realistic solo returns to about 4% or 5%.
Returns fall for an arithmetic reason. Rewards divide across everyone staking, so more participation means a smaller share each. Note also what the yield is denominated in. A 3% return paid in ETH is 3% in ETH terms, and a 40% fall in the ETH price over the same year produces a negative dollar outcome regardless.
The validator centralization question
Among validators, concentration is real, and the people who defend Proof of Stake acknowledge it.
Roughly a quarter of all staked ETH sits with Lido. In May 2025, the Pectra upgrade raised the maximum effective stake per validator from 32 ETH to 2,048 ETH, letting large operators consolidate many validators into fewer.
Against that, Proof of Work concentrated too: three mining pools produced over half of Bitcoin's blocks in mid-2026. Both mechanisms tend to concentrate under economic pressure, and neither has solved it.
Where mb.io fits
Securing the network is what validators do. As a regulated crypto spot exchange, mb.io is where you buy, sell, and swap assets and own what you hold.
mb.io is backed by MultiBank Group, a financial institution founded in 2005 that serves more than 2 million clients across 100+ countries.
- Regulated by VARA in the UAE and AUSTRAC in Australia
- 10/10 security score from Hacken, an independent blockchain security auditor
- Institutional-grade MPC custody powered by Fireblocks, with segregated client funds
- A curated list of assets, so you're not sorting through thousands of tokens to find the ones worth trading
- Buy, sell, and swap in three steps, from sign-up to purchase
- 24/7 multilingual client support
Open your account and start trading on mb.io.
Frequently asked questions
What does a validator do?
It proposes blocks, votes on whether blocks from other validators are valid, and stays online to do both. Partly random and weighted by stake, selection decides whose turn it is to propose the next block on the network.
How much ETH do I need to be a validator?
32 ETH to run your own. Liquid staking protocols and exchanges accept any amount, at the cost of fees and additional risk.
What is the difference between a validator and a miner?
By putting capital at risk, a validator secures a Proof of Stake chain. By burning electricity, a miner secures a Proof of Work chain. Validators are selected by stake weight; miners compete by computing power.
What is slashing in crypto?
A penalty destroying part of a validator's stake for protocol-level attacks such as proposing two blocks for the same slot or signing conflicting attestations. Ordinary downtime is penalized but not slashed.
Can I lose my stake as a validator?
Through slashing for specific offenses, yes, and accidental misconfiguration such as running two copies of the same validator is the most common cause. For most people, the larger risk is the staked asset falling in price.
How much do validators earn?
In mid-2026, native Ethereum staking sat near 2.78% annually, rising to roughly 4% to 5% with MEV rewards. As more capital stakes, returns fall, since the same issuance divides among more participants.
How many validators does Ethereum have?
More than 1.24 million as of mid-June 2026, securing roughly 39.7 million staked ETH. Counting validator slots rather than individual operators, that figure reflects how many one operator can run.
Do I need technical skills to run a validator?
To run your own, yes: you need to keep a machine online reliably and configure it correctly. Liquid staking and exchange staking exist precisely because most people would rather not.
