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Blockchain is a decentralized and distributed digital ledger technology that records data—typically transactions—in sequential, cryptographically linked blocks. Each block contains a list of verified transactions, a timestamp, and a reference to the previous block, creating a secure and immutable chain. Blockchain is the underlying technology behind cryptocurrencies like Bitcoin and Ethereum, but its applications extend to supply chains, voting systems, smart contracts, and more. It ensures transparency, security, and trust without the need for a central authority.
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