Empire Market is late, original and developing for the ceiling of dark web marketplaces on the hidden network.
It collects almoust all of it's fundamental features from now Alphabay. And calling itself a successor of it.
The legitimacy of It's onion links can be verified by using the deep web marketplace's own link-verifier page http://empiremarket-url.com/.
If URLs links out of work, here is the onion link where you can discover active onion market mirrors http://empiremarket-url.com/