Reminds me of a talk I saw by Stephen Boyd from Stanford a few years ago: https://www.youtube.com/watch?v=wqy-og_7SLs

(Slides only here: https://www.slideshare.net/0xdata/h2o-world-consensus-optimi...)

At that time I was working at a healthcare startup, and the ramifications of consensus algorithms blew my mind, especially given the constraints of HIPAA. This could be massive within the medical space, being able to train an algorithm with data from everyone, while still preserving privacy.