An execution issued and served under this article shall, in the case of money due or to become due to a contractor on public work, apply only to such sums as shall be payable to the contractor after completion and acceptance of the work. Certification of completion and acceptance by the officer or body whose duty it is to make such determination shall be sufficient evidence to the proper officer of the facts of completion and acceptance for purposes of making payment in satisfaction of suggestee executions issued under this article.