Except when a guaranty is deemed an original obligation as provided in section 22-01-05, a guaranty must be in writing and signed by the guarantor, but the writing need not express a consideration.
Guaranty to be in writing - Exception - Consideration need not be expressed
N.D.C.C. § 22-01-04, under Guaranty.
N.D.C.C. § 22-01-04