{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can the security and availability of nodes be ensured in a blockchain network?","a":"Install and configure firewalls: Install firewalls on  node devices, such as iptables, to prevent unauthorized access and potential attacks."}]}],"pr":"d7c76205be461b67f195e578e60d54144be2a3ea45182868a0da87fcacb88f36"}