Hi all!
I have been doing some research but i couldn't manage to understand:
1) what are the sources for price feeds to calculate settlement price in smart coins?
2) if the prices are fetched and fed to the network by witnesses ...then who assures that witnesses don't collude to manipulate the price feed at their coinvenience?
   i have see that the number of witnesses is really small, it would be quite easy for them.

I hope that someone can reply to my questions, thanks.