{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do blockchain nodes manage storage space in daily maintenance?","a":"Data backup and cleaning: To ensure data security, blockchain nodes need to perform regular data backups. Meanwhile, node administrators should promptly clean up outdated data  that is no longer needed, thereby releasing storage space."}]}],"pr":"9abc50597c45b1cda83b7ce69ca79e23d5db45753e96ccf04d89897d72610d69"}