{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can the security of blockchain technology be ensured?","a":"Immutability: Each block  contains the hash value of the previous block, forming a chain-like structure. Once data is recorded on the blockchain, it is difficult to tamper with because attackers need to modify the data in all related blocks simultaneously, which is virtually impossible in practice."}]}],"pr":"b609b3464fcb93cdf02d46c3231848339a44f47964cd089d68f4c504df1c85c8"}