Inkan enables you to revoke and replace key pairs when your private key has been lost or stolen. You can also perform periodic key rotations preemptively. You can do all this in a decentralized manner. That way Inkan gives you a permanent online identity that only you control, and that you can be confident you can keep over the long-term. For example 50 years. Inkan is open for testing and comment. Let me know if you'd like to try it out.