Is "Registering Your Product" still a thing?

HAve had this Nano for awhile and finally got around to trying it out. There is a bit in the doc that came with it giving me a code and telling me to register my product. Problem is I cannot find anywhere on the website to do so. Is registration even taking place anymore and if so where?

Thank you in advance.

No it is not a thing.
It would have been a thing for the old DOT ORG site but was dropped.