The document set held when the seller filed Chapter 7 twenty months later
I papered a sub-to for a partner in early last year and got a phone call in the fall that started with "my ex says the house is part of her bankruptcy." It wasn't, and the reason it wasn't is boring paperwork done before anyone had a problem.
What was in the file. Deed recorded within four days of closing, with the transfer tax treatment confirmed with the title company in writing beforehand because that varies by state and some states treat a deed with an existing loan differently than a cash sale. A signed acknowledgment where the seller states in her own handwriting that the loan stays in her name, that the lender can call it, and that she has been told to talk to her own attorney. Limited power of attorney for insurance and servicer communication only, nothing broader. Authorization to release information filed with the servicer. A servicing account through a third-party servicer so every payment has a date, an amount, and a payer that is not us and not her. And a reserve of six payments held in that account, funded at closing.
When the trustee's questions came, the answer was a printout. Deed recorded twenty months earlier, consideration stated, 20 straight payments from the servicer, insurance showing the buyer's entity as an insured. That was the end of it, roughly $1,900 of legal time to respond.
Whether a transfer holds up against a bankruptcy estate is a legal question that turns on state law and the facts, and it needs a bankruptcy attorney rather than a forum. What I'd keep is the habit of building the file for the day someone hostile reads it. The reserve is the part people skip. It is also the part that proves you were never one bad month from default.