{"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":"1912c40202e2d7eae60afdca539f37b7ba7a46b38775f5453d82a91c7ae70a8b"}