{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to choose between file system wallet and paper wallet in a blockchain?","a":"Environmental friendliness: Paper wallets use physical materials and may  not be as environmentally friendly as file system wallets, which utilize digital"}]}],"pr":"ffacda7949211d4addeec4558cb6d223eda00f4096cfe081a52ec4e0b6a6ae23"}