Cryptocurrencies like Ethereum and Bitcoin

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Cryptocurrencies like Bitcoin and Ethereum use blockchain technology for secure and decentralized financial transactions. The basic idea behind blockchain is to create a digital ledger of transactions that is stored on a network of computers. 




Each transaction is validated and recorded by the network of computers, which ensures that the transaction is secure and cannot be tampered with. The network of computers that maintain the blockchain are called "nodes," and they work together to verify and validate each transaction. Each node has a copy of the entire blockchain, which contains a record of every transaction that has ever taken place on the network. This makes it impossible for any one person to alter the blockchain without the consensus of the entire network.

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