The blockchain can be used to enrypt the data you generate on a blockchain and entrust the user with a cryptographic token that can be used to generate differen

The blockchain can be used to enrypt the data you generate on a blockchain and entrust the user with a cryptographic token that can be used to generate different tokens that allow others to decrypt specific sets of data, like location tracking. The tough part about this is that for the user to truly own their data, they must be entrusted with the root keys of their data, and if they lose it, and their backup pass phrase, the data is lost forever.