{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"Please translate the following content into English: What are the key files needed for backing up when upgrading blockchain?","a":"The key files required for blockchain upgrading include: block data, chain structure data, transaction data, wallet private keys, consensus algorithm-related data, network configuration files, smart contract code and configuration files, etc. Before upgrading, it is essential to back up these key files to prevent data loss or  damage. Meanwhile, attention should be paid to ensure the security and integrity of the backup files to prevent data leakage or malicious tampering."}]}],"pr":"b569d59f4b9fdc4b48d40d613252ef4ca4b46bf6e1e57cfef8fbc321615ea73c"}