{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The recovery process after a blockchain upgrade includes the following steps:","a":"Backup data before upgrade: Before the upgrade, a complete backup of the existing blockchain  data is required in case of accidental data loss during the upgrade process. The backup data includes block data, transaction data, account information, etc."}]}],"pr":"a055ccd8979e18c870d39687c63e71ed129377667e74c86b1a7f10e8588ba517"}