{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the failure handling principles for blockchain upgrading?","a":"Analyze the reasons: Conduct in-depth analysis of  the reasons for the upgrade failure, find the problem, and prepare for the subsequent upgrade."}]}],"pr":"43959170dd6e282f5626e34e2fc36b05374a031e17c2ea62003be86a0e8b66e9"}