To me proof of brain means socio-network capacity. So its not quality of content, but quality of interaction and relationship management.
But the definition itself is somewhat up to interpretation, it was probably designed this way with very little caveats.
Regarding me being a witness. I've considered it, but think that when the time is right, it might happen, however, I need to have something solid, a very solid project to even consider it seriously.
Ohh I was tottaly wrong, I thought proof of brain meant proof you had a brain haha. I get it now dumb question! I did learn soomething so I'm glad I asked. If you figure out something and decide to do it (run for witness) I wonder what your "very solid project" will be and how it will benefit us!