{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain solve the problem of digital traceability?","a":"Decentralization: Blockchain stores data  on multiple nodes, avoiding the single data storage and potential risks brought by centralized storage. This makes the blockchain system more secure and reliable, helping to ensure that digital traceability information is not tampered with."}]}],"pr":"bc5a4535dbebf9fba66fc308512289ef690edc2fdf2f3544a6d98588d14aea75"}