Del. Code tit. 10, § 4718

No judgment entered by virtue of a warrant of attorney in the Superior Court, upon any bond or obligation with condition other than for the payment of money, shall be or operate as a lien upon real estate until the bond or obligation and warrant of attorney, or a copy thereof, certified under the hand of the prothonotary and the seal of the Court, is filed in the office of such prothonotary. The prothonotary, at all times thereafter, shall safely keep such bond or obligation and warrant of attorney, or certified copy thereof, in his or her office. The provisions of this section shall not apply to any official bond or obligation given by a public officer.