{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the operating principle of smart contracts in blockchain?","a":"Writing contracts: The creation of  smart contracts requires the use of specific programming languages and development tools. Common smart contract programming languages include Solidity, Vyper, etc."}]}],"pr":"2127214ed20ee10fa9b085c359483c41c3b14fa7300170632f11bc3ecced16a9"}