The recent development of ICT (Information and Communications Technologies) has radically altered the concept of identity, which today embodies the different social levels of an individual, such as: family, work and friends. Digital identity is built not only upon what we are, but also from what we do online and how we interact to others, that is why it has become so relevant. Moreover, with more than three billion users on the Internet, each of them with multiple digital identities, managing these identities is very important. People often have the feeling that we do not have control of our information, due to the large number of private companies that daily commercialize with our data without our explicit consent. This is how the concept of sovereign digital identity arises, it is an expression of digital identity in which the user has full control of their data, apart from being able to manage who can access them and on which terms. In this project, the main objective is to promote uPort, a powerful technology that will be soon part of our daily lives. To achieve this goal, a depth analysis of this new identity paradigm has been carried out, outlining the main differences and advantages with respect to a centralized identity system. On the other hand, a search for possible use cases has been executed and an application called Cibertickets has been implemented. It shows how using uPort as a management system of sovereign digital identity, multiple problems in the process of buying tickets for events are solved. For example, prevent the use of bots to buy tickets massively and be able to resell them, the frequent dependence on third-party intermediary companies such as Facebook or Google to register or even the difficulty of certain companies to accomplish the GDPR (General Data Protection Regulation).