E-Mail IMAGE: "More than 90% of users are unaware of whether their wallet is violating this decentralized design principle based on the results of a user study, " researchers said. And if an... view more Credit: Creative commons via Pxhere A computer science engineer at Michigan State University has a word of advice for the millions of bitcoin owners who use smartphone apps to manage their cryptocurrency: don't. Or at least, be careful. Researchers from MSU are developing a mobile app to act as a safeguard for popular but vulnerable "wallet" applications used to manage cryptocurrency. "More and more people are using bitcoin wallet apps on their smartphones," said Guan-Hua Tu, an assistant professor in MSU's College of Engineering who works in the Department of Computer Science and Engineering. "But these applications have vulnerabilities."