{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can permission control be implemented in a blockchain?","a":"Cryptographic technology: Blockchain uses cryptographic algorithms (such as SHA-256) to encrypt and protect data, ensuring the security of the data. Nodes participating in the blockchain network need to possess private keys, which are used for signing and verifying data. Only the holders of private keys can initiate transactions and  access relevant data."}]}],"pr":"351c9b12b36e255bf0c6c5b9ecbc5f8f3f8cdd54ece8d80fad2e6df80e36b92b"}