Node (Network Node)

A node is any computer or device that connects to a blockchain network, storing a copy of the distributed ledger and playing a key role in validating transactions and maintaining the network’s decentralized architecture. Nodes communicate in a peer-to-peer fashion to ensure every participant has the same version of the blockchain and agrees on its current state. There are several types of nodes, each with specific responsibilities. Full nodes validate and store the entire blockchain and enforce consensus rules. Light nodes (or SPV nodes) store only block headers and rely on full nodes for verification. Mining nodes, used in Proof of Work systems, add block creation by solving cryptographic puzzles. Validator nodes, found in Proof of Stake networks, stake tokens to validate blocks and earn rewards. Archive nodes retain the entire historical state of the blockchain, making them useful for deep data queries. Running a node often requires storage, computing power, and a stable internet connection. While resource-intensive, nodes are essential for network security, trustlessness, and decentralization, and allow individuals to participate directly in supporting blockchain integrity.