{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to recover when a blockchain upgrade fails?","a":"Analyze the cause of the failure: First, a deep analysis of the reasons for the upgrade failure is needed, which may include software errors, configuration issues, network failures, etc."}]}],"pr":"f2ea519045c27baca8a96dda30cc4f4fe1d3cd25e043237e8d3e4aab030ed6de"}