{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What should be done if there are issues after a blockchain upgrade?","a":"Emergency plan: According to the nature of the problem, formulate an emergency plan to ensure the normal operation of the  blockchain system. For example, if a technical issue occurs, consider temporarily rolling back to the previous version or adopting an emergency repair measure."}]}],"pr":"a2c92c9c8ee97a337a57ebaaa689d380de11e0ec4afa6f0f457c4a4cd6a20ff8"}