{"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":"6753901fc9f1eebb95c64367025fdc9b5994ae0f08940fcda4735f2075911679"}