{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What types of smart contracts are included in blockchain?","a":"Copyright management contracts: This type of smart contract is mainly used for copyright registration, licensing, and infringement  monitoring, etc."}]}],"pr":"3da5a37b6c19f3acc8e9cb3fdccb7caa4b2224b4326a6b4b4297fc586914c6f0"}