{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"In a blockchain, how can the type enforcement and persistence of objects be ensured?","a":"Data structures: Blockchain adopts specific  data structures (such as chain-like structures, Merkle trees, etc.)"}]}],"pr":"a9cee3d82618bd51f578a95bee0f37363354b5fc19b811e22ab37b7ed0db51ae"}