With the digitalization and increasing number of Internet users,more and more personal data breaches occur. Many people are not awareof their personal data rights and have not received any instructions on howto act in situations such as when their personal data is abused. This issomething that illustrates the flaws of the Internet. A technology thatprovides solutions to some of these problems, such as trust andtransparency, is the blockchain technology. Hence, the objective of thispaper is to investigate knowledge about personal data rights and to explorethe design of a prototype of a blockchain application for increased securityand transparency. User tests were conducted, highlighting the greatestneeds for users to feel secure and in control over their personal data. Thisknowledge provide the foundation for a prototype based on blockchaintechnology that gives the users increased security and forces those whostore personal data to be more transparent with the usage.