{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the specific steps to follow for a blockchain upgrade?","a":"Code review and modification: Review the existing blockchain code, find potential problems and security vulnerabilities, and perform corresponding code modifications  according to the upgrade solution."}]}],"pr":"43e279b4393118438b48fdc4b21a9dfc98fee26f73ab3347b02242e190e0b67c"}