{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How is tracking data imported and exported in blockchain nodes?","a":"Data cleaning and preprocessing: After importing the data,  the node needs to clean and preprocess the data. This includes removing unnecessary empty spaces,"}]}],"pr":"123bb9b2e7b1e7c57a9600c8664af6e053770b39702f6e0cf95e09e7096612c8"}