{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the technical principles of blockchain?","a":"Data Structure: Blockchain uses a chain-like data structure, arranging data in blocks according to time order. Each block contains a certain amount of data, and  blocks are connected to each other through hash functions, forming an unchangeable chain structure."}]}],"pr":"dd9b35c33af61777577dc86f4b211382173351979b93c8d22e7ac2d1d85100f4"}