An appeal must be taken within thirty days after the service of the order or judgment with notice of entry, or the service by the clerk of a certified copy of the order or judgment, by serving upon the claimant or his attorney, or upon the attorney-general, and upon the clerk, in like manner as in the supreme court, a written notice to the effect that the appellant appeals from the order or from the judgment or from a specified part thereof, and briefly stating the grounds of the appeal.
N.Y. Court of Claims Law § 25