From the moment blockchain was conceptualized in the early 1990s, it was defined as the most secure method of storing data in existence.
The decentralized manner in which a blockchain functions eliminates single points of failure inherent to centralized systems.
Within a blockchain-based authentication environment, there would be no way to fake an ID, passport, credit card number, or any digital asset that you registered.
Even if a would-be hacker was able to access the data without proper approvals from the data owner, he wouldn’t be able to copy it. It would be impossible to add a new block to the chain without the majority of nodes verifying its validity.
Unlike with current protocols in which the third party companies basically become data owners once users hand the information over, a blockchain network would enable users to be totally in charge of their data.
They’d have full control over who has the right to use their data and what can be done with the information once access has been granted.