Thanks for addressing this Dan

We suggest that any account can temporarily disable the posting and voting of another account until that account logs in with their active or owner key. This is a kind of identity challenge that will prevent hackers from abusing the platform.

To be clear this means some kind of active key transaction?

To prevent abuse and to compensate the individual for proving they have the active key, the challenger will have to transfer about $10 worth of STEEM to Steem Power in the challenged account. Accounts can be limited to one challenge per day to prevent excessive harassment.

This is open to deep pockets, sybil attack, and could be used as a way of getting a targeted user to ferret out a powerful key at the wrong time. This idea could create more abuse than it solves.