Why data in blockchain is not tamperable
Each block has a unique Hash value, which is generated based on the content of the block, and once the content is changed, the Hash value of that block also changes.
Each block contains the hash value of the previous block.
If you modify the content of a block, the Hash of the block is different at this time. However, the hash value associated with the hash of the later block is still the same as before, so it is not the same, and you will find the difference when you validate it. If the validation does not pass, the data cannot be uploaded to the chain.
