Is your name on the title of the property as well? If so, then file a homestead declaration which, in Nevada, blocks creditors from forcing a foreclosure of real property if the equity in the house is less than $550k. If your house is worth more than $550k, and it's paid off, then they can foreclose, sell it, and give you $550k out of the proceeds.
If your name is not on the title, then the answer to your question is to hire an attorney to assist you in defending this.
William Devine, II
Rainey Devine, Attorneys at Law
I am an attorney, just not your attorney (yet). Any answers here are to be deemed informational unless and until you retain me as your attorney for actual legal services and legal advice. I offer free in-person consultations. If you like my answer, please hit the thumbs up button.
Whenever there is a foreign judgment, it must be registered in the state where the assets are located in order to be collected. Although the challenges to the judgment are limited, there are defenses that may be available to challenge the judgment. If you do nothing, the judgment will become valid.
This leaves you with protection provided by state laws called exemptions and I am posting a link to a description of these exemptions. To claim a homestead exemption, you must live on the property and file a declaration of homestead with the county recorder.
If you have not retained an attorney, you are going to pay dearly. Hope this perspective helps!