{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the impact of blockchain on system security?","a":"Difficult to tamper with data: Each block contains the hash value of the previous block, forming a chain structure. Once the data in a block changes, it will cause the hash value of the subsequent blocks to change, making it difficult to tamper with the data."}]}]}