{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the steps to upgrade the main network of a blockchain?","a":"Deploying upgraded nodes: Before the mainnet upgrade, it is necessary to deploy  upgraded nodes on the testnet first to verify the effectiveness and stability of the upgrade."}]}],"pr":"d9934cc024a8c79bea09e5a3edb60ed0acbf01f9425018baf5ff4cd812c97e0a"}