Multi-signature support for validator nodes is a critical security enhancement designed to protect the integrity of the Proof of Stake (PoS) blockchain network. This feature mandates that multiple authorized parties must sign off on any sensitive operations, such as transaction validations or configuration changes, before they can be executed. By requiring consensus among multiple stakeholders, this feature significantly reduces the risk of unauthorized actions, fraud, and single points of failure, thereby enhancing the overall security and trustworthiness of the validator nodes.