{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the necessary conditions for the process of blockchain version upgrade?","a":"Code Review: Before the upgrade, a strict review of the new code  is required to ensure code quality and reduce potential security risks."}]}],"pr":"bb512565e983d8cb80c485d2b5d3328bcd849bfb04f13addd7106566476ac03b"}