{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The steps for recovering nodes during a blockchain upgrade are as follows:","a":"Backup data: Before the upgrade, it is necessary to back up the data of the blockchain  node in case of data loss due to unexpected incidents during the upgrade process."}]}],"pr":"075c241c36767296259a6df713c73625fa9da07e911093b97e6fdd7e4ec9d29d"}