A validator is a participant in a blockchain network that relies on PoS (proof-of-stake) or PoA (proof-of-authority) consensus mechanisms. A validator:
To become a validator in a PoS blockchain, a user must lock up a deposit (stake) in the form of the network’s native cryptocurrency (e.g., ETH in Ethereum). This stake acts as a financial incentive to behave honestly and may be partially or fully slashed (confiscated) if the validator violates the rules. On the contrary, honest work is rewarded through transaction fees and, in some networks, additional incentives are provided.
In PoA (Proof-of-Authority) blockchains, validators are selected based on their reputation. This model is primarily used in corporate or private blockchains, where decentralization is not a priority, and trust in participants is a more significant factor.
- Verifies that the sender has sufficient funds and that the transaction complies with the network’s rules;
- Groups validated transactions into blocks and proposes them for addition to the blockchain;
- Ensures network security by detecting fraudulent activities such as double-spending.
To become a validator in a PoS blockchain, a user must lock up a deposit (stake) in the form of the network’s native cryptocurrency (e.g., ETH in Ethereum). This stake acts as a financial incentive to behave honestly and may be partially or fully slashed (confiscated) if the validator violates the rules. On the contrary, honest work is rewarded through transaction fees and, in some networks, additional incentives are provided.
In PoA (Proof-of-Authority) blockchains, validators are selected based on their reputation. This model is primarily used in corporate or private blockchains, where decentralization is not a priority, and trust in participants is a more significant factor.