The testimony of a subscribing witness is not necessary to authenticate a writing unless required by the laws of the jurisdiction whose laws govern the validity of the writing.
Neb. Rev. Stat. § 27-903
Rule 903. Subscribing witness testimony; when necessary
Laws 1975, LB 279, § 63.
Official source: Nebraska Legislature. Reproduced from public-domain Nebraska statutes; confirm against the official source for the current text. Not legal advice.