Data structure, transmission device, receiving device, settlement device, method, and computer program

A settlement method executed by a settlement device configured to receive data via a network interface and including a computer for performing data processing, the settlement method including steps executed by the computer of:

• upon request of a user, encrypting, using a pseudo-random number as an encryption key, virtual currency data corresponding to virtual currency having a monetary value to generate virtual currency encryption data, the virtual currency encryption data including issuer information including at least information on an issuer of the virtual currency data, amount information that is information for specifying the monetary value, and settlement condition information that is information on conditions for accepting payment with the virtual currency;
• transmitting the virtual currency encryption data to a user device of the user, wherein the user device transmits the virtual currency encryption data to a predetermined device;
• receiving virtual currency encryption data via network interface from the predetermined device for requesting settlement;
• decrypting, using the pseudo-random number, the virtual currency encryption data, which has remained encrypted from a time of its generation until being decrypted by the settlement device;
• determining whether a condition specified by the settlement condition information obtained by decryption of the virtual currency encryption data is satisfied;
• and
• accepting settlement of an amount of money specified by the amount information obtained by decryption of the virtual currency encryption data in response to the condition specified by the settlement condition information being satisfied.