Liens attached to a house sold on land contract

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I sold a house on land contract. I wanted to know if it is possible that a lien from a government education loan in default could be attached to this property, and does this jeopardize my equity? I should be in first position when the house finally gets sold, right? So even if the house had a lien attached to it, I should get what I am owed first in the event of a payoff or sale.... is this correct?