How much secure the blockchain is?

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The blocks located in the blockchain, store transaction data as well as hashes and timestamps.

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The HASH is a unique reference number that represents the data stored in the block.

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And the timestamp shows the creation or modification time of the block.

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When someone tries to change the data of a block, its hash also changes, as well as the hash of the next block, also changes.

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Similarly, the hash changes in every block in the blockchain and the data becomes invalid.

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Therefore it becomes necessary to change the data of every block, which is impossible.

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The data in the blockchain technology is secure.

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