{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the steps involved in upgrading a blockchain?","a":"mart Contract Upgrade：If smart contracts are  used in the blockchain system, it is also necessary to upgrade the contracts."}]}],"pr":"11ed019379882843648f011cc6067991b8a077d7a5c7904c1535810f9b4bb4cf"}