Offshore trade is a widely used business model in international trade, but because of its opaque capital flow, transaction information is not open, offshore trade has certain risks. In order to guarantee the national economic security and trade interests, the authenticity verification of offshore trade has become an important issue. This paper designs and implements the offshore trade authenticity verification platform based on blockchain technology through the mapping relationship between the user demand analysis of offshore trade authenticity verification and platform functions. The application test of the constructed digital platform is carried out, and the test results show that it also has stable average response time and efficient TPS performance advantages under the premise of meeting daily business needs. This platform can actively promote regional trade facilitation, stimulate financial institutions’ demand for industry exhibition, and achieve digital empowerment for the development of background offshore trade.