{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the core characteristics of blockchain?","a":"Traceability: Each transaction  in the blockchain can be traced back to its source, achieving the traceability of data."}]}],"pr":"a11408e18df487376d6a9a58d1fb42d992006e871fdc32b1f17dfaa6b82d7ced"}