In a blockchain, nodes are the individual computers that maintain the network. They store copies of the entire blockchain and validate transactions by following the network’s protocol rules. Nodes work together to achieve consensus on the state of the blockchain, using mechanisms like Proof of Work or Proof of Stake. By verifying and broadcasting transactions, they ensure the network remains secure, transparent, and decentralized. Nodes also participate in adding new blocks to the chain, helping to preserve the integrity and immutability of the blockchain.
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