The addresses

All three, in full, at the top of the page. Each one is 56 characters long before the .onion, and every character matters. The copy buttons put the entire string on your clipboard in one click, which is the only reliable way to get it into an address bar.

Before you press enter

Compare the last six characters in your address bar against the end of the string you copied. The tail is short enough to check by eye and long enough that a typo shows up. If the ends match and the lengths match, you have the right address. If either differs, delete what is in the bar and copy again from the top of this page. Do not fix a mismatch by editing a character. Recopy.

What a wrong address does

Onion names resolve by mathematics, not by a domain registry. There is no DNS and no typo correction. A single letter off points at a different service. Usually that service is nobody's and the page simply fails to load. Occasionally it is somebody's, and they decide what you see. The length of these strings is not decoration. It is the lock.

Where addresses come from

Onion addresses do not change on their own. If the market ever moves, the new address is announced from the market itself, in places where you are already signed in. Random pages, forum posts and mirror lists are where stale and lookalike addresses live. If an address you found differs from the three above by even one character, the three above win.

Still unsure after pasting? The verify page walks through the full check, including the one that has to happen on the market's own login screen.