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Discover LudwigSuggestions(5)
"was proof of" is correct and usable in written English.
You can use it to indicate that something is evidence that something else is true. For example, "The long line of customers waiting outside the store was proof of its popularity."
Exact(60)
This was proof of life.
And it was proof of that tonight".
Mostly it was proof of concept.
Modano's goal was proof of that patience.
"The Breathing Show" was proof of that.
Venus Williams was proof of that yesterday.
It was proof of my existence writ large.
Mr Morvillo said that was proof of their innocence.
And this new character was proof of his commitment.
Here was proof of Breton's belief in "petrified coincidence".
For Assad, though, it was proof of his people's loyalty.
More suggestions(21)
be proof of multiple
was testimony of
was demonstration of
was indication of
was documentation of
was validation of
was test of
was verification of
was certification of
was testament of
became proof of
designed proof of
yes proof of
considered proof of
exactly proof of
maybe proof of
become proof of
described proof of
was an indication of
was a demonstration of
was the evidence of
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com