Patterns — separate
Personal Data Store
Subjects keep control on their personal data that are stored on a personal device.
User data confinement pattern
Avoid the central collection of personal data by shifting some amount of the processing of personal data to the user-trusted environments (e.g. their own devices). Allow users to control the exact data that shares with service providers
Anonymous Reputation-based Blacklisting
Get rid of troublemakers without even knowing who they are.