"confirmed facts" is correct and usable in written English.
You can use it when referring to facts that have been verified or accepted as true. For example: "The researchers presented the jury with confirmed facts from their findings."
X-ray testing confirmed facts that everyone more or less knew.
If there are confirmed facts of doping rules being violated by certain athletes or officials, they should be punished".
This is an area heavy in speculation and light on confirmed facts, but we do know some things for sure.
We will make such an examination in any case as soon as we have confirmed facts available".
"The investigation confirmed facts that show grave human rights violations attributable to public servants of the federal police," said the commission president, Luis Raul Gonzalez Perez.
The toxins Mr. Vidal was identifying in 1960 as hovering threats on the democratic horizon are now confirmed facts of political life, so that this once-trenchant drama — concerning a battle for the nomination between a high-minded, deeply moral candidate and his canny, cutthroat rival — feels like a civics lesson drawn from a long out-of-date textbook.
It still remains a many times confirmed fact that Gardner's column in Scientific American and his subsequent books drew to mathematics a considerable number of young minds.
Until then, this is speculation, not confirmed fact.
With regard to the marksmanship issues I did not write this was a confirmed fact.
At the very least, Vulgar Favors is handy for determining which parts of the show are confirmed fact and which are purely conjecture.
Sometimes they veered into Bengali to confirm facts before presenting them to me.
