What is recorded in the block chain is the hash value of the health care data. In other words, if health care data is stored in MediBloc, the hash value in MediBloc is stored in blockchain. This ensures integrity (I am not convinced how integrity is ensured ...) Health care data will be stored in a database distributed outside the block chain. (IPFS) Personal medical information and information are encrypted and stored with a private key, which gives the individual exclusive ownership and access. Therefore, we would be reducing costs by storing data outside the block chain. For more information friend Hive account@bhaski here I leave the link of web page.