N.C. Gen. Stat. § 43-26
No decree of registration heretofore entered, and no certificate of title heretofore issued pursuant thereto, shall be adjudged invalid, revoked, or set aside, unless the action or proceeding in which the validity of such decree of registration or certificate of title issued pursuant thereto is attacked or called in question be commenced or the defense alleging the invalidity thereof be interposed within 12 months from March 10, 1919.
No decree of registration hereafter entered and no certificate of title hereafter issued pursuant thereto shall be adjudged invalid or revoked or set aside, unless the action or proceeding in which the validity of such decree or of the certificate of title issued pursuant thereto is attacked or called in question be commenced or the defense alleging the invalidity thereof be interposed within 12 months from the date of such decree.
No action or proceeding for the recovery of any right, title, interest, or estate in registered land adverse to the title established and adjudicated by any decree of registration heretofore entered shall be maintained unless such action or proceeding be commenced within 12 months from the date last mentioned; and no action or proceeding for the recovery of any right, title, interest, estate in registered land, adverse to the right established by any decree of registration hereafter shall be maintained unless such action or proceeding be commenced within 12 months from the date of such decree.
No action or proceeding for the enforcement or foreclosure of any lien upon or charge against registered land which existed at the date when any decree of registration was heretofore entered, and which was not recognized or established by such decree, shall be maintained, unless such action or proceeding be commenced within 12 months from the date above mentioned; and no action or proceeding for the enforcement or foreclosure of any lien upon or charge against registered land in existence at the date of any decree of registration hereafter entered, and which is not recognized and established by such decree, shall be maintained, unless such action or proceeding be commenced within 12 months from the date of such decree.
N.C. Gen. Stat. § 43-26