{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the specific steps for upgrading a blockchain?","a":"Code modification and writing: Modify and optimize  the existing blockchain code according to the design solution to implement new functions and improve performance."}]}],"pr":"d86a93cf2962d20d9975b9d12393a79eabcc84be50fbc7dbf4c6934f4aba58a7"}