{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The recovery process for a blockchain upgrade is as follows:","a":"Data backup: Before blockchain upgrading, it is necessary to  back up the entire network data of the blockchain, including block data, transaction data, account balances, etc. The purpose of backing up is to quickly recover to the previous normal state in case of problems during the upgrade process."}]}],"pr":"f34368ffc5154ff121c5cae31ba3c27d1f0a1d14a9a9900431a48360a1b406f1"}