{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the technical challenges that large-scale blockchain systems may face?","a":"Security mechanisms: The blockchain system within large cycles needs to establish a trustworthy security mechanism to ensure the security of data and assets.  This includes paying attention to the security of smart contracts."}]}],"pr":"1a46dfa63e34c192281d8b1a50dfc825738366fd3055a49d16e96aa59de64b85"}