{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the specific steps for upgrading a blockchain?","a":"Deploy the upgraded blockchain system on the main network, and promote it to users and businesses in a  planned and orderly manner."}]}],"pr":"d2c01d70dba83135474dcea578200d91ce3dde2c4a93832cd79541d8376efd98"}