{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How are blockchain technologies applied in copyright protection?","a":"Unique identifier: By generating a unique identifier using blockchain technology,  a unique identity can be established for each copyright work, which helps to trace and verify the source and ownership of the work."}]}],"pr":"7617d652a565efae3ca96eeb4949e7d6f350be7f997c0762c727845061347e57"}