{"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":"Importing data: First, the  node needs to obtain tracking data from external data sources (such as blockchain browsers, exchanges, etc.). These data are usually stored in formats that can be parsed, such as JSON, CSV, or other formats. The node retrieves this data through API interfaces or crawlers, and stores it in local databases such as SQLite or MongoDB."}]}],"pr":"73fe23d0ea652090d3070e2b23ca96531e8223c40a388f959f7e5473fd6f3d4d"}