Validator is a core element of blockchain: definition and functions

A validator is a participant in the blockchain without whom the operation of modern Proof-of-Stake networks is impossible. These node operators play a critical role in maintaining the integrity of the network and are rewarded for their work. In this material, we will explain what it is, how to get started, and what to consider when choosing.

Definition of a validator and its main functions

A validator is essentially a keeper of the blockchain who performs several key duties to support the network’s operation:

Verifying and approving transactions. The primary function is analyzing the authenticity and correctness of each transaction in the network. The validator checks cryptographic signatures and ensures that the transaction complies with the network protocol.

Creating new blocks. After verification, validators combine approved transactions into new blocks and add them to the chain. This activity requires computational resources and ensures the orderly expansion of the blockchain.

Participating in consensus. Validators are part of the mechanism for reaching agreement among network participants. They confirm the correctness of the ledger’s state and the validity of new entries, providing a unified view of the transaction history.

Protecting against threats. Validators act as a barrier against attacks, including double-spending and fraudulent transactions. By adhering to protocol rules, they guarantee the security of the entire system.

PoS and PoW: differences between validators and miners

Validators operate in Proof-of-Stake (PoS) systems, where they stake their own assets to gain the right to participate in validation. In Proof-of-Work (PoW) systems, miners perform a similar role by solving complex mathematical problems.

Although both groups verify transactions and create blocks, their working principles differ fundamentally. Miners compete in computational power, while validators stake cryptocurrency and are selected proportionally to their deposit size. PoS is recognized as a more energy-efficient approach and is gradually becoming the standard for emerging networks, including Ethereum, Solana, and Polkadot.

How to get started: a step-by-step guide to becoming a validator

If you decide to become a validator, follow this sequence:

Step 1 — Choose a network. Decide on a blockchain that uses the PoS mechanism. The most well-known are Ethereum, Solana, Polkadot, and other major projects.

Step 2 — Acquire the required asset. Purchase the minimum amount of the network’s cryptocurrency as a stake. This is your deposit, which confirms your serious intentions.

Step 3 — Deploy a node. Install client software on a server or personal computer and set up the validator node according to the chosen network’s documentation.

Step 4 — Select a platform. Decide whether to operate through a wallet, exchange, or specialized service. User-friendly interfaces are important for daily activities.

Step 5 — Lock assets. Lock your cryptocurrency via staking. This mechanism turns it into collateral, ensuring honest behavior in the network.

Step 6 — Connect to the network. Activate your node and start participating: verify transactions, propose new blocks, collaborate with other validators to reach consensus.

Step 7 — Follow the rules. Consistently adhere to the protocol to avoid penalties (slashing) or loss of your stake. Honesty and timeliness are key to profitability.

Remember, requirements and procedures vary for each network, so before registering, review the official documentation.

Criteria for choosing: how to assess a validator’s reliability

If you delegate your assets to another participant (delegated staking), meaning you place cryptocurrency without running your own node, choosing the right partner is critically important. An incorrect choice can lead to loss of income or even funds, so pay attention to these parameters:

Contribution to development. Reliable operators actively participate in network governance, propose protocol improvements, and support community initiatives. This demonstrates their interest in long-term success.

Size of the stake. The amount of personal cryptocurrency staked by the validator indicates their commitment and risk sharing. Larger stakes are often chosen more frequently by the network’s algorithm, increasing the chance of earning rewards.

Operational stability. The node should operate without interruptions. Frequent downtimes lead to penalties and exclusion from the network. Check the candidate’s uptime history.

Reputation in the ecosystem. Look for information about how long the operator has been active, any incidents in their history, and how the community evaluates their activity. A positive reputation is an indicator of reliability.

Security of infrastructure. It is important that the validator uses secure servers, regularly updates software, and conducts security audits. These measures reduce the risk of hacking and loss of funds.

The process of selecting a validator varies across ecosystems, but the goal is the same — to find a trusted partner who provides maximum security and income. Work with verified platforms and never rely solely on promises of high returns.

Understanding the role of a validator in the blockchain allows you to make informed decisions, whether you aim to run a node or delegate to an operator. A clear understanding of functions, requirements, and evaluation criteria is key to successful participation in the ecosystem.