With the digitalization and increasing number of Internet users, more and more personal data breaches occur. Many people are not aware of their personal data rights and have not received any instructions on how to act in situations such as when their personal data is abused. This is something that illustrates the flaws of the Internet. A technology that provides solutions to some of these problems, such as trust and transparency, is the blockchain technology. Hence, the objective of this paper is to investigate knowledge about personal data rights and to explore the design of a prototype of a blockchain application for increased security and transparency. User tests were conducted, highlighting the greatest needs for users to feel secure and in control over their personal data. This knowledge provide the foundation for a prototype based on blockchain technology that gives the users increased security and forces those who store personal data to be more transparent with the usage.