Expressions of Interest are hereby invited for the following: Development and maintenance of United Nations Crypto Stamps. The United Nations Postal Administration (UNPA) seeks to engage a contractor to help develop, create, and maintain the next generation of the United Nations Crypto Stamps. It is anticipated that a contract for three (3) years with the option to extend for two (2) additional one-year periods will be established. Country: Global. Please confirm the closing time as it was not published. (投標 №97531975cn)