A blockchain is a decentralized ledger that records all transactions across a network of computers. Unlike traditional ledgers maintained by banks or institutions, a blockchain is transparent and can be accessed by anyone in the network. Each transaction is grouped into a "block," which is then added to the chain of previous blocks, creating a chronological history of all transactions. This technology ensures that no single entity controls the system, making it more secure and resistant to fraud.
One of the key features of blockchain is immutability—once a transaction is recorded, it cannot be altered or deleted. This transparency and security have made blockchain the foundation of cryptocurrencies like Bitcoin and Ethereum.
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