Patient X needs some medical data while having a medical appointment at institution Z, but the data was created during a previous appointment between X and Y, and the data is kept by professional/institution Y. In this scenario, X is usually a regular person. Y and Z are different health professional or health institutions.
A solution based on blockchain can enable large-scale accessibility, keeping data
privacy, reducing curating and mediating costs, as well as providing trustless trust in information systems.