{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the roles of different order types in the blockchain?","a":"Ensuring transaction security: Blockchain technology has  the characteristics of decentralization and immutability, and order placement can ensure the security of information and funds during the transaction process, preventing fraud and false transactions."}]}],"pr":"ef60d8edcb290e4a90d16fc7be20d8075ca226b99e14a033f6cde7d2974a0a9d"}