{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the role of certificates in blockchain?","a":"Identity verification: Through certificates, blockchain systems can recognize and verify the identity of participants, ensuring that only authorized users can access and participate in the blockchain network. This helps maintain the security and privacy of  the blockchain."}]}],"pr":"2b44d51905ded408a36ba536652d1c2510a9c869fbfd0c6b8f1dee6c9fdd3ec4"}