For a while now, I've been wanting to design a world where the average temperature is very high (compared to Earth, but nowhere near as high as Venus) but the water does not boil because the atmospheric pressure is several times as high as it is on Earth.
In this scenario, we would have oceans of a solvent which we know life can work in, but the temperatures may well exceed the point at which proteins denature.
So, what biochemistry would work here?
Ideally, the biochemistry on such a planet should be primarily of carbon, hydrogen, and oxygen, similarly to Earth biochemistry, but I do not care if the biochemistry on this alien planet could not incorporate nitrogen, phosphorus, etc.
For the purposes of this question, we will assume an average temperature of 70°C and an atmospheric pressure of 3.5 atmospheres.
I will only accept answers saying that Earth biochemistry would work on such a planet after all if at least one organism has been found not only to survive but to reproduce with its whole body under such conditions.