This will serve as a proof.

以此为凭。

《新英汉大辞典》

Postmark serves as a proof.

邮戳为凭。

《新英汉大辞典》

This example is unspectacular but serves as a proof-of-concept.

这个示例并不引人注意，但是提供了概念证明。

youdao

This evidence can be used by investigators who are working to solve the crime and as proof in a court of law.

VOA: special.2010.05.05

And, in fact, a computer program has come up with a proof that, as far as was known, nobody in the world had ever come up with before.

而实际上,电脑程序的证明方式,据目前所知,是前人们从未曾提出过的

耶鲁公开课 - 死亡课程节选

In Phase II, teams are expected to complete and demonstrate a functional software configuration as a proof of concept.

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Still in beta, Interesante has been developing content for the Argentinian community as a proof in concept for a diaspora-driven business model.

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The Youngstown facility will serve Ohio, Pennsylvania, and West Virginia and is designed to function as a proof-of-concept for an eventual network of 15 manufacturing innovation institutes around the country.

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