{"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":"Optimizing storage structure: Blockchain nodes can adopt techniques such as sharding and hierarchical storage to optimize storage efficiency and maintain  data accessibility."}]}],"pr":"02a1005272687f429106e1c05be05e77d4af1af7bd720f4ed4559e17f0534596"}