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What is the role of nodes in a blockchain network?
Nodes are essential components in a blockchain network, responsible for maintaining the network’s integrity, security, and decentralization. In blockchain, a node is any device such as a computer or server that connects to the network and participates in validating, storing, and relaying data. Nodes play different roles depending on the blockchain type and configuration, but they all work together to maintain a transparent and trustworthy system.

Each node in the network holds a copy of the blockchain’s entire transaction history. This ensures that, even if one node goes offline, other nodes retain the complete ledger, preserving data integrity. Nodes communicate with each other to confirm and synchronize new transactions, ensuring that all copies of the blockchain are consistent.

In terms of functionality, some nodes, known as full nodes, verify all blocks and transactions against established protocol rules. They help prevent invalid transactions, thus safeguarding the network against fraud or double-spending. Lightweight nodes, by contrast, do not store the full blockchain history but rely on full nodes for verification.

The decentralized nature of nodes makes blockchain resistant to censorship and tampering. By distributing data and validation across multiple points, nodes enable blockchain to function as a secure, transparent, and decentralized system.

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