{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain ensure the immutability of data?","a":"Cryptographic technology: Blockchain uses cryptographic technology to protect data security, such as public-private  key encryption algorithms. Each transaction uses digital signatures to verify its source and authenticity, and only those holding private keys can sign transactions. In addition, blockchain also adopts hash functions and M..."}]}],"pr":"ff57df1f10776a3369a5b44dca4aaf75fa109e896f799b0c1a30867dcde5f235"}