what is Block chain

 Blockchain is a distributed, decentralized and immutable digital ledger that records transactions across multiple computers or nodes in a secure and transparent manner. It is the underlying technology behind cryptocurrencies like Bitcoin, but its potential applications go beyond just digital currencies.

At its core, blockchain is a chain of blocks, where each block contains a list of transactions or data. Once a block is added to the blockchain, it cannot be altered, making it secure and tamper-proof. This is achieved through cryptographic techniques and consensus algorithms that ensure all participants in the network agree on the state of the ledger.

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