{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain achieve immutability of data?","a":"The main ways to achieve immutable data through blockchain are as follows:\n\nThe first aspect is the structure of the data. The data in the blockchain is packaged based on the consensus mechanism within a certain period  of time, according to established rules. The miners elected collectively (nodes on the chain, which can be understood as servers) package the transaction data collected during this period, and include the hash value of the previous block header in the package. The newly packaged data generates a hash value and places it in the newly generated block header. In this way, the chain forms a linked database. If the data in any block on the chain is tampered with, it will cause the hash value of the block header to change."}]}],"pr":"b4146a3124d66d2501bbe2d128eddeacc48249238873141a0d3ea438c85ade74"}