People need to share data in order to interact with organisations on a regular basis. One problem is that data of individuals, is often used for other purposes than where the data was shared for. Another problem is data that is often required once only, for identification purposes which gets stored on legacy systems with the risk of being leaked. We have built the Didux Blockchain protocol with private smart contracts, a solution where a person can own, control, share and revoke his or her’s personal data. We provide individual users total control of their data in a secure, GDPR compliant way and we offer companies a solution to verify the identity of their customers.