Node involvement refers to the participation of individual nodes within a network, such as a computer network or a blockchain. Each node can perform specific functions, such as processing transactions, storing data, or relaying information. The level of involvement can vary based on the node's role, whether it is a full node, which maintains a complete copy of the network's data, or a lightweight node, which relies on other nodes for information. In the context of blockchain technology, node involvement is crucial for maintaining the integrity and security of the network. Nodes work together to validate transactions and ensure that all copies of the data are consistent. This decentralized approach helps prevent fraud and enhances the overall reliability of the system.