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What is a validator in cryptocurrency and how does it work?

03/19/2026

What is a validator in cryptocurrency and how does it work?

When you send cryptocurrency, someone needs to verify that you actually have the coins. In the real world, this is the responsibility of banks. In cryptocurrency, it's validators. These are network participants who maintain order and confirm every transfer. Without them, the system would descend into chaos. Let's explore who these validators are and how they work.

Key article highlights

  • A validator is responsible for confirming transfers in blockchains using the Proof–of–Stake algorithm.
  • To do this, one must lock their own coins in the system as a guarantee of honesty.
  • Validators receive commissions for their work – a method of passive income.

Article Table of Contents

Who is a validator and what they do

What is a validator, in simple words. A validator (from validate – to confirm) – is a network participant who verifies transactions and adds blocks to the blockchain. A cryptocurrency validator works in Proof–of–Stake (PoS) blockchains: Ethereum, Solana, Avalanche, Polkadot. There are no validators in Bitcoin, there are miners instead.

When you send cryptocurrency, someone must check: do you actually have these coins? In the traditional world, banks are responsible for this. In cryptocurrencies – validators. These are network participants who monitor order and confirm every transfer. Without them, the system would turn into chaos. Let's find out who they are and how they work.

How a validator's work is structured in the blockchain

There is a constant flow of transactions in the network; all operations are collected in a queue. A validator takes a batch of operations, checks them, and packs them into a new block.

What a validator checks:

  • Whether the sender has enough money
  • Whether they are trying to send the same coins twice
  • Whether the signature matches their key
  • Whether the commission meets the minimum requirement

After verification, the validator signs the block and sends it to others for consensus. If the majority says the "block is correct", it is added to the blockchain. The validator receives a reward – commissions from the block plus a reward from the network.

To obtain validator status, one must lock their coins. In Ethereum – 32 ETH (about $80,000). This is insurance: if you work honestly – the coins are yours and generate income. If you cheat – the deposit is forfeited.

What function do validators perform

Without validators, the blockchain would lose decentralization and security. First – transaction confirmation. A cryptocurrency validator is responsible for the honesty and transparency of transfers. Otherwise, you could send money and then claim you sent nothing. Second – protection against attacks. To rewrite history, one must control more than half of the validators. If there are many of them and they are distributed around the world, this is practically impossible.

In services like Nadoswap, you see the result of validator work every time you exchange cryptocurrency. Thanks to them, the exchange happens quickly and without intermediaries.

Validator vs Miner – main differences

This is a frequent question among beginners. Both confirm transactions, but they do it differently. Miners work on Proof–of–Work (PoW). This is Bitcoin and the old Ethereum. Miners compete: whoever solves a complex problem fastest adds the block and takes the reward. This requires powerful equipment. With the random selection of validators, their stake is considered – the larger it is, the more often the chance to confirm blocks arises. Those with a larger deposit are chosen more frequently. They do not waste electricity, they just hold coins and apply a digital seal.

The path to becoming a validator: requirements and conditions

Several conditions must be met:

  • Financial requirements. Each network has its own threshold. In Solana – about 1 SOL, in Avalanche – 2000 AVAX. In some networks, the threshold is lower, but competition is higher.
  • Technical requirements. A server operating 24/7 is needed. A reliable computer with fast internet and protection against hacking. Many rent cloud servers.
  • Software. Install the network client, synchronize with the blockchain, and set up monitoring.

Incomes and risks of being a validator

Advantages:

  • Money comes in on its own.
  • Benefit to the ecosystem. You support the blockchain operation.
  • Predictability. Income is more stable than in mining.
  • Low costs. No need for expensive equipment and electricity.

Risks:

  • Loss of deposit (slashing). If the server disconnects or you confirm two different blocks, the system cuts part of the coins.
  • Volatility. Both income and deposit are in cryptocurrency. If the coin drops, the income in dollars drops as well.
  • Technical complexities. Need to monitor the server and update software.
  • Competition. The more validators there are, the less each one gets.

Influence of validators on network security

A validator in crypto – is the main shield of the blockchain. If someone tries to repeat a transfer twice, validators will see it and only let the first transaction through. To take over the network, one would need to gather more than half of the validators. This costs billions of dollars – it is easier to play by the rules. Validators cannot block a transaction if it follows the rules. No one will prevent you from moving money anywhere.

The significance of validators for the crypto world

Validators – are real people who voluntarily take responsibility for order in the blockchain. They risk money, spend time, and ensure every transfer reaches its recipient. Thanks to them, we send coins in seconds without worrying that the money will be stolen. They make the blockchain honest and transparent. Understanding a validator's work helps in choosing networks and services consciously. When you compare rates on Nadoswap, they are there behind every operation – the invisible guardians of the crypto world.

FAQ

1. Are a crypto validator and a miner the same thing?

No. Miners on PoW spend electricity on tasks. Validators on PoS ensure network operation by verifying the correctness of transactions.

2. How much can you earn as a validator?

On average, 5–15% per year of the stake amount. Part of it goes to taxes and expenses.

3. Can you lose coins by becoming a validator?

Yes, through slashing. If the server is unstable or you confirm conflicting blocks, the network will take the deposit.

4. Who chooses a validator for a block?

Validators are assigned by a random algorithm, but the probability of being selected is proportional to the amount of their deposit.

5. What is delegation?

You pass coins to a validator, but they remain in your wallet. The validator works, and you receive part of the income minus their commission (usually 5–20%).

6. How many validators are needed for security?

The more, the better. There are about a million in Ethereum; in smaller networks, 50–100 are sufficient if distributed.

7. Can a validator steal my coins during delegation?

No. The smart contract is designed so that the validator only has block confirmation functions, not management of your coins. You can exit delegation and return the coins to yourself at any time.

8. Does a cryptocurrency validator affect transaction speed?

Indirectly. If they work fast – transactions are instant. If they are slow or the network is overloaded – the transfer may hang.

Read more about the basics of DeFi and the role of stablecoins within it in our blog.