Empire Market is original, original and expanding for the peak of tor network marketplaces on the tor.
It holds almoust all of it's fundamental features from now Alphabay. And claims itself a beneficiary of it.
The legitimacy of It's onion URLs can be verified by using the darknet marketplace's own link-verifier website http://empiremarket-url.com/.
If onion URLs links out of work, here is the onion link where you can find working darknet market mirrors http://empiremarket-url.com/