specific and perfected lien

The long established rule requires that the lien must be definite, and not merely ascertainable in the future by taking further steps, in at least three respects as of the crucial time. These are: (1) the identity of the lienor; (2) the amount of the lien; and (3) the property to which it attaches. It is not enough that the lienor has power to bring these elements, or any of them, down from broad generality to the earth of specific identity.