Requirements for Generic Voucher Trading

摘要

In purchase and other trading transactions, it is often required tocredit loyalty points, collect digital coupons or gift certificates,and so on. These activities can be generalized using the concept ofa 'voucher', which is a digital representation of the right to claimgoods or services. This document contains a voucher trading modeland the requirements for the following points:1. A voucher trading system to circulate vouchers securely2. A language to describe diverse types of vouchers.