Blockchain Node

Blockchain node is a computer or software instance connected to a blockchain network and performing one or more functions defined by the protocol or implementation.

Depending on its type, a node may store the blockchain history, validate transactions and blocks, relay data to other participants, or maintain only a limited representation of network information.

Common node functions

• receiving and validating transactions;
• receiving and validating blocks;
• relaying network data;
• storing blockchain state or history;
• participating in consensus when the protocol requires it.

Common node types include full nodes and light nodes. Their storage, CPU, memory, and networking requirements can differ significantly.