The phrase 'serves as confirmation' is correct and usable in written English.
You can use it when expressing that something is proof or evidence of something, such as an agreement, fact, or statement. For example, "Having the written contract signed by all parties serves as confirmation of the agreement."
It has been clear for a while that others in Europe have little appetite to match the UK's binding 50% target and this announcement merely serves as confirmation.
But things are never quite that simple – like Corbyn, it now serves as confirmation of the idea that if you stay in the same place for long enough, eventually everyone else will come full circle and join you.
If that wasn't clear enough already, Google 's annual Zeitgeist list, released Wednesday morning, serves as confirmation.
It seems that in this context, the weather warning only serves as confirmation of what is already planned and decided on.
Giving him awards for his destructive messages only serves as confirmation and validation of ideas that are clearly and undeniably dysfunctional.
We recently declared that the 24-year-old would be topping annual best-dressed lists by 2014, and this Lancôme gig just serves as confirmation of Collins' style savvy.
For some in the audience it surely served as confirmation of Mr. Rollins's godlike stature.
In a broader sense recent confirmation that the Open Championship will return to Royal Portrush served as confirmation of this region's uplifting rehabilitation.
If you've ever suspected that Las Vegas is a portal to the depths of hell, then this album should serve as confirmation.
For many Spaniards, becoming part of Europe served as confirmation that democracy was here to stay - and Brussels provided the best guarantee of that.
The announcement of the deal on Thursday and the involvement of the closely followed Mr. Buffett served as confirmation that deal-making spirits have revived in corporate America.
