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Why can't blockchain data be deleted or changed?

When data is intercepted between blockchain blocks, it is almost impossible to delete that data or make any changes to the data. Because to know this, first you need to know what each of these blocks contains. Each single blockchain in the entire blockchain basically has three things - data, hash and hash of its previous block in the chain.
blockchain technology is most secure System and if one time generate any hash then we can't write or edit only for read and for that's why blockchain slowly slowly going up.
Blockchain basically is like registrar which keeps permanent records by default. And it remains undeleted because it is meant to keep it as long term. so in some cases it may allow editing but not deletion. so the blockchain may be too much data not deleted but it is worth it.

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