Predictive, preventive, personalized and participatory medicine, known as P4, is the healthcare of the future. To both accelerate its adoption and maximize its potential, clinical data on large numbers of individuals must be efficiently shared between all stakeholders. However, data is hard to gather. It’s siloed in individual hospitals, medical practices, and clinics around the world. Privacy risks stemming from disclosing medical data are also a serious concern, and without effective privacy preserving technologies, have become a barrier to advancing P4 medicine.