{"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":"f6101edbe8a2292c1847a5c3a705cc48157f76b02cc93541deef6c91cf9ca659"}