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The blockchain format was first used for bitcoin, as a solution to the problem of making a database both secure and not requiring a trusted administrator: in this case the blockchain consists of blocks that hold batches of valid transactions.
Blockchain is a distributed database that maintains a continuously-growing list of records called blocks secured from tampering and revision.
The basic concept of blockchain is quite simple: a distributed database that maintains a continuously growing list of ordered records. However, it is easy to get mixed up as usually when we talk about blockchains we also talk about th…