~Regarding whether in marketing a proofreader might claim to “have proven”~
That proof is in the pudding
Is proven after oven;
But “oven” within “proven”
Is proved by simple vision.
So here we see that “proven”
Is participle likewise
To “proved” in sentence given;
No doubt a cause of sad sighs.
For often it is questioned
Why these two words should battle
To prove the most deserving
To serve as only participle.
It leaves us quite unsettled
When choosing “proved” or “proven”:
What rule “has proved” its truth yet,
Or what “has proven” certain.
Though use by country varies,
Feel safe with “proved” in general.
It ends in “d” deliberate,
“Default” the clue in total.
For adjective, no quandary;
It's “proven,” recent risen.
Remember “proved” is also
The simple past when bidden.