请您给我解释一下什么是区块链技术，要用英文回答，并且要用三个完整句子来描述。
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Blockchain is a decentralized digital ledger technology that records transactions across multiple computers in a way that ensures the data's security and transparency. It operates without the need for a central authority, relying on cryptographic principles to maintain integrity. Each block in the chain contains a series of transactions, and once a block is added, it is nearly impossible to alter, ensuring immutability and trust in the system.
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