{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to achieve automatic switching between main nodes and backup nodes in a blockchain network?","a":"Flood control mechanism: The blockchain network implements a flood control mechanism to prevent the occurrence of multiple main nodes. When a node fails or becomes unstable, the network will  automatically prevent other nodes from becoming main"}]}],"pr":"b39dc8b05c44f836b8ad8b091216827ca17d768789d4899e027ae455681ca149"}