What is a Blockchain - Steven Kelly

A blockchain is a decentralized and distributed digital ledger that records transactions across multiple computers or nodes. It is designed to provide transparency, security, and immutability to the data it stores. Each transaction is grouped into a block, which is then linked to the previous blocks through cryptographic hashes, forming a chain of blocks. This chaining mechanism ensures that any modification to a previous block would require altering all subsequent blocks, making the blockchain highly resistant to tampering. Blockchains are used in various applications, including cryptocurrencies, supply chain management, voting systems, and more.
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