{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"Why is blockchain considered secure?","a":"Difficulty in tampering with data: Each block contains the hash value of the previous block, forming a chain structure. Once the data in a block is changed, it will cause the hash value of the subsequent blocks to change, rendering the entire chain invalid. Therefore, tampering with data on the blockchain requires simultaneously tampering with all related blocks  and obtaining the consent of more than half of the nodes, which is virtually impossible in practical operations."}]}],"pr":"79c5efa1a82cfcba976c00dde2117b670f1a350a9be8ae7c0b997bf41275615e"}