A newbie here. I just wanna how NEM is different than NXT.
Besides, both seem to be similar xcpt on the fair distribution.
NEM builds on top of the NXT ideas, but it will be based on new code. The development plan has more information about the proposed feature set. But, one of the biggest differences will be around the NEM forging algorithm.
I found an interesting post about coin security on their forum.
Maybe something there can help you with the PON or POI idea.