Empire Market is original, original and reaching for the hights of darknet markets on the onion.
It has practically all of it's central features from now Alphabay. And calling itself a replacement of it.
The validity of It's onion mirrors can be verified by using the onion marketplace's own link-verifier website http://empiremarket-url.com/.
If URL links out of work, here is the mirror where you can find active darknet marketplace mirrors http://empiremarket-url.com/