{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to handle a failed blockchain upgrade?","a":"Code vulnerabilities: Conduct a comprehensive review and testing of blockchain code to find  potential vulnerabilities and repair them. At the same time, pay attention to known security vulnerabilities in the network and ensure the security of blockchain code."}]}],"pr":"b0ec4d7a7d2e0ff5c328249e2d5dc37b7ec57af6661e144329a0ec3e163e5333"}