We use a public blockchain to protect our users from <a href="https://keybase.io/docs/sigchain#footnote-1-pgp-key-servers-and-lying-by-omission">misbehaving servers</a>. Because of that, you can’t delete your publicly announced account information and account activity once you post it to your signature chain. You can, however, revoke it. Revoking, in Keybase, means retracting the original statement, indicating that it’s no longer true, or that the information has changed.</