{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can offline signatures be used for payments in blockchain?","a":"Preparing tools and environment: First, relevant development tools such as Java, Python need to  be installed and configured, as well as the corresponding blockchain node environment, such as Ethereum, Tron, etc."}]}],"pr":"2d3b4cbdbaa893c67902d38e4d49af2f065055350cb56a4f8ed9cea5e961fdf6"}