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A **blockchain** is a decentralized, distributed ledger technology that securely records transactions across a network of computers. Each **block** in the chain contains a timestamped set of transactions. Once a block is added, it cannot be altered, ensuring the integrity and immutability of the data. This **distributed ledger** is maintained by participants, not a central authority, making it inherently resistant to censorship and fraud. The **security** of a blockchain relies on cryptographic principles, linking each new block to the previous one, forming a continuous and verifiable historical record of all **transactions**. This technology underpins cryptocurrencies like Bitcoin and is increasingly used for tracking supply chains, managing digital identities, and securing data where transparency and trust are paramount.
