This paper proposes to provide Asian common currency in the form of digital currency using technology such as blockchain by an international organization (eg AMRO) in East Asia. In this proposal, we assume that each present currency and the new digital common currency coexist in the respective economies for the time being. With the advent of digital currency, the common currency has become more technically feasible. Our proposal has the following three advantages; (1) merits as a digital currency, (2) merits as a common currency, and (3) a currency that is managed in a multilateral flamework. By the last point, it could prevent dominant control of an international currency by large countries, and political fairness can be secured. This proposal has a perspective to develop into a global digital currency in the future.