{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What preparations do validators and operators need to make before performing a blockchain upgrade?","a":"Confirm  node health: They need to check the health of all nodes to ensure that there are no abnormalities, such as viruses or malware, to ensure the smooth progress of the upgrade process."}]}],"pr":"961fcbdc51c40e42f6f751ba4157fb4a0af92cf340e8e6108cb6c64a999c93e9"}