understand the transaction in your state

In Texas, all transaction must be closed either in a title company or attorney office. What you need to do is verify the title company or attorney's license that is a real title company or attorney.

You may also check the agent license information. In most case, as long as the agent is licensed, you should be protected. In texas if you loss money to a licensed person, state has so called protection fund to pay you back.

Keep good record for all your payment.