I think you'd have to give some of those key pieces to sociopaths for this to be foolproof. Otherwise they could torture you until you reveal contact informatio

I think you'd have to give some of those key pieces to sociopaths for this to be foolproof. Otherwise they could torture you until you reveal contact information for each of the pieces. Then they can contact each of the people, and show a live video stream of you being tortured and play on their sympathy to give up the piece of key. Though I guess having a live video stream of you being tortured wouldn't be in the best interests of the person doing the deed. Maybe that's the catch that makes it work?