{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to recover when a blockchain upgrade fails?","a":"Re-upgrade: According to the cause of the failure,  repair or reinstall the blockchain nodes, and then re-perform the upgrade operation. Ensure the process of upgrading."}]}],"pr":"602e481a308647fb2c2390e42f97ab6d791ec1193035ad13d34cd016fea7932e"}