In this third and final article of the series John Callahan discusses a new idea – the Horcrux protocol – that will securely link your biometrics and online identity credentials via blockchain technologies. Most online identity systems are limited in the sense that they can’t be tied to your real-world identity. They fail to provide sufficient levels of assurance needed for full digital identity management. Your driver’s license, passport or other credentials are based on personally identifiable information (PII) tied to your real identity. Several leading blockchain-based identity projects that are trying to achieve full digital identity management via an idea called self-sovereign identity.