A computer implemented method for safe, efficient, and fraud-proof continuous retrieval of health data is disclosed. The method comprises receiving a request to update a record associated with a user blockchain comprising identification information associated with a health tracker, a health tracker server, and user authentication data; generating an instruction to receive user data based on the identification information and user authentication data; receiving health data from the health tracker server; retrieving and verifying the validity of the user's latest blockchain; storing the data in a volatile memory; and creating a new block instance corresponding to the data.