Naut is NXT tokens so you can trade Naut in nxt platforme
https://nxtportal.org/currencies/18154834130337484019
I just created a demo account on nxt paltform https://demo.nxt.org/index.html# I try to get acces to asset exchange but the website still showing me thus msg "You don't have any assets in your bookmark list yet. Click on "Add Asset" in the top right corner to add one."
 if you have any idea about Naut ID
https://imgur.com/a/dnWvT