The threat is a fake link, not the market

Almost everyone who loses something to a market like this lost it to a copy of the login page, not to the market itself. That is good news, because it is the one thing fully in your hands.

Take the risks in order of how often they actually bite. Top of the list, by a wide margin, is a phishing mirror. Someone stands up a page that looks exactly like the BlackOps login, gets it in front of you through a poisoned link, and collects your password when you type it. Everything below that is rarer.

The check that stops it

Copy your link from a source you trust and never type an onion from memory. Then, every single session, read the address on the login screen back against your bar before your password goes anywhere. BlackOps prints its onion inside the anti-phishing captcha and again in the header. A clone can fake the look. It cannot serve the real address in both spots while pointing you at itself. If the two do not match, you are on a fake, and the move is to close the tab, not to squint and hope.

Account hygiene

A username you have never used anywhere else, so the account cannot be tied to an old identity. A long unique password from a local manager, never reused. The recovery phrase on paper, never typed into a login box. PGP two-factor switched on. These take ten minutes once and quietly protect you for as long as the account lives.

Keep the balance small

Whatever sits in a market wallet is exposed to whatever might happen to the market. Deposit for the order in front of you, spend it, and pull the rest back to your own wallet. The buyers who get hurt when a market has a bad day are usually the ones who parked a balance there.