Validator Node

A validator node is the machine that proposes and attests to new blocks on a proof-of-stake blockchain. To take part, an operator locks (stakes) the network's coin and runs client software that must stay online and sign correctly; in return it earns issuance and transaction fees. The stake is what makes honesty rational — if a validator signs conflicting blocks or goes offline for long periods, the protocol can penalise it through slashing or a leak, destroying part of the deposit. Many holders never run hardware themselves and instead delegate to an operator or use a staking service, which means trusting that operator's reliability. Key management matters: a compromised signing key can get the whole stake penalised.