{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to prevent the double-spending risk in blockchain networks?","a":"Cryptographic technology: In blockchain networks, transactions are encrypted using cryptographic algorithms (such as SHA-256) to ensure the  integrity and security of transaction data. Meanwhile, digital signature technology is used to verify the authenticity of transactions and the identity of senders, preventing double-spending attacks."}]}],"pr":"25244b869418a1f6c8c2caf0866cae35612ee0355a1b3ae9fa20c0dd88ef9882"}