Node

A node is a computer that participates in a blockchain network by storing, validating, and relaying transactions and blocks. Each node maintains a copy of the blockchain ledger and independently verifies that new transactions follow protocol rules before accepting them. Nodes communicate with each other to reach consensus on the valid state of the network. Running a node requires sufficient computational resources and network connectivity, though requirements vary significantly depending on the blockchain. Nodes are essential infrastructure that enable blockchain networks to remain decentralized, secure, and resistant to censorship by distributing validation responsibility across many independent participants rather than relying on central authorities. Example: The Bitcoin network consists of tens of thousands of nodes run by individuals and organizations worldwide. When someone broadcasts a Bitcoin transaction, it propagates through the peer-to-peer network as nodes relay it, validating the transaction's cryptographic signature and checking that inputs haven't been previously spent. Why it matters for blockchain technology: Nodes are fundamental to decentralization and security. Without sufficient node participation, networks become vulnerable to centralization and manipulation. The more nodes validating transactions, the more truly decentralized and censorship-resistant the blockchain becomes.

Category: blockchain technology

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