A bond given pursuant to this Article shall be:
The clerk of superior court shall not accept such mortgage or deed of trust until it shall have been properly registered in the county or counties in which the real estate is located, and the clerk of superior court is satisfied that the real estate subject to the mortgage or deed of trust is worth the amount to be secured thereby, and that the mortgage or deed of trust is a first charge on said real estate. No such mortgage or deed of trust shall be cancelled or surrendered until the approval of the final account, unless substitution is permitted as provided in G.S. 28A-8-3(d).
N.C. Gen. Stat. § 28A-8-2