{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the precautions to consider during the blockchain upgrade process?","a":"Backward compatibility: Ensure compatibility between the  new and old versions, avoiding data loss or system crashes due to upgrading."}]}],"pr":"566582d8f7412018cbfa5c201cb7dafc49f6f6a00d634e67c25f419f864e75b8"}