A node that verifies transactions and maintains the blockchain in Proof of Stake and similar systems.
A Validator is a node responsible for verifying transactions, proposing blocks, and maintaining network security in Proof of Stake (PoS) and related consensus mechanisms. Validators replace miners in PoS systems by staking tokens instead of performing energy-intensive computations.
Validators form the backbone of modern blockchain networks.
What Validators Do
Confirm and validate transactions
Propose new blocks
Participate in consensus
Secure the network against attacks
Earn staking rewards for honest behavior
Risk losing part of their stake if they act maliciously (slashing)
Requirements to Become a Validator
Staking a minimum amount of tokens
Running reliable hardware or cloud servers
Maintaining high uptime
Following network rules
Using secure key management
Some networks allow users to delegate their stake to validators.
Examples of Validator Networks
Ethereum
Solana
Cosmos
Polkadot
Avalanche
Each network has its own validator requirements and reward structures.
Summary
A validator verifies transactions and helps secure a PoS blockchain by staking tokens and participating in consensus.
