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All three open the same market, so the account, balance and open orders are identical behind each one.
blackops5l63qnwnmlnsfvtlu66md3x3vp3fdtpna42eq7ozujr67hid.onionblackops6kignp3eddmvqcfkjzf6qr6haxbmkypc2xtqlnhuu4ak4dqd.onionblackops27m32abqvbhnyswgazqawxqbznbzkkkv5sjo7gve2ndpsdad.onionBefore you sign in. Open these in Tor Browser only, and compare the onion printed on the login screen against your address bar. If they do not match, close the tab.
A hidden service absorbs floods. Running one address means an attack closes the market for everybody until it passes. Running several means an attacker has to hold all of them at once, which is a much harder job, and it means a slow address is an inconvenience rather than an outage.
Copy rather than type, because fifty six characters reproduced by hand is how people land on a lookalike. Then compare the onion printed on the login screen against your address bar before your password goes anywhere. A cloned page can copy the design perfectly and cannot show the real address while living at its own.
Use another address from this page rather than searching for one. The search that follows a quiet address is where nearly every phishing loss starts, and it is completely avoidable by keeping this page bookmarked. The full explanation is in the briefing on slow links.