N.H. Rev. Stat. Ann. § 529:35

The person having the estate or right of the creditor, purchaser or debtor in real estate taken in execution shall be deemed to be, and shall have the rights, privileges and remedies of, the creditor, purchaser or debtor, as to all persons having notice of his right; and no act done by or to the original creditor, purchaser or debtor shall thenceforth be of any validity.