Share private data and prevent data forwarding Let's say A has some private medical records of patients and B is a pharmaceutical company who wants to view medical records from A to find out the effect of a particular drug on the patients (run a drug evaluation logic to get performance statistics of a particular drug). A wants to share the private data to B but wants to prevent B to forward (leak) the data to other third party organizations. How can this problem be solved with blockchain?
Nothing can prevent B from exposing or forwarding the data once he has access to it.