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Blockchain technology is a revolutionary innovation that offers a decentralized, secure, and transparent method for recording and verifying digital transactions. It forms the backbone of cryptocurrencies like Bitcoin and Ethereum, but its applications extend far beyond digital currencies, including supply chain management, healthcare, finance, and government sectors. Blockchain's core strength lies in its ability to establish trust between parties without the need for a centralized intermediary. At its core, a blockchain is a distributed ledger that records transactions across a network of computers, known as nodes. Each transaction is grouped into a block, and each block is linked to the previous one, forming a chain—hence the term "blockchain." This structure ensures data integrity and transparency, as altering any block would require altering all subsequent blocks across the entire network, which is practically impossible without majority consensus. One of the key concepts in blockchain is decentralization. Traditional databases are typically centralized, meaning a single authority controls the data. In contrast, blockchain operates on a peer-to-peer network where each participant maintains a copy of the ledger. This reduces the risk of data tampering or failure due to a single point of attack. Blockchain also employs cryptographic techniques to secure data, ensuring that transactions are authenticated and cannot be altered once recorded. The blockchain operates through a process known as consensus. Since there is no central authority, the network uses consensus mechanisms to agree on the validity of transactions. Two of the most commonly ____ ___ _____ ______ ____ _______ ________ __________.
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