{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How is the security of smart contracts ensured in blockchain?","a":"Cryptographic protection: Smart contracts are based on cryptographic principles, using private keys  for signing and encryption to ensure the security of data transmission and access."}]}],"pr":"ea2bf90c90577b50ea2f53266b98bb7005ed83f2f6bfe19dfae4cf523bf68d4d"}