A node is a computer or device that is connected to a blockchain network and helps maintain, validate, and distribute data across that network. It plays an essential role in ensuring that the system remains decentralized, transparent, and secure.
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A node verifies transactions and keeps the blockchain network running without relying on a central authority.
In a blockchain network, every node communicates with other nodes to share information about transactions and blocks. Full nodes store a complete copy of the blockchain and independently verify all transactions according to the network’s rules, while light nodes store only part of the data and rely on full nodes for validation. Some nodes, known as validator or miner nodes, are responsible for adding new blocks to the blockchain by confirming transactions. Because thousands of nodes operate globally, it becomes extremely difficult to manipulate the system, making blockchain networks resistant to fraud and censorship. However, running a node can require significant storage, bandwidth, and technical understanding, especially as the blockchain grows over time.
Short example:
Suppose you send 1 Bitcoin to a friend.
Before the transaction is completed, multiple nodes in the network check whether you actually own that Bitcoin and whether the transaction follows all rules.
If the transaction is valid, it is included in a block and added to the blockchain.
After that, all nodes update their records so the transaction is permanently stored and visible across the network.
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