{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the handling principles for dealing with failed blockchain upgrades?","a":"Ensure security: In the process of blockchain upgrading, priority should be given to data security and  system stability to prevent hacker attacks and data loss."}]}],"pr":"ff3bb70c3c4f072549d1974a192fa812393a86aa15a4de1c10b3a7403a8141ec"}