A blockchain is a continuously increasing ledger(file) that retains a secure, chronological, and immutable record of all transactions that have occurred. It can be used to send money, property, contracts, and other items securely without the need for a third-party middleman such as a bank or government. The most well-known cryptocurrency, Bitcoin, is built on blockchain technology. It's a peer-to-peer electronic cash system and a decentralized network that lets users conduct transactions without the need for a third party to handle the transaction.

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