Another interesting use case is for supply chain management, since the history of a interactions relating product can be documented in a secure manner Eg. you can buy a nike shoe that you can cryptographically validate that it was signed off by Nike, who made it, when they made it, when it was shipped, and even how much each of these parties got paid for their service. (Take a listen here: https://media.consensys.net/state-change-44-shining-a-light-...)
