[Telepathic Intruder]

Not exactly proven, but neither are black holes. Although there is observational evidence for them, unlike Hawking radiation. The problem is that with any black hole we may discover, the Hawking radiation would be so feeble that even the cosmic microwave background would dwarf it by a huge factor. But nevertheless, the first two reasons in my original post serves to make this particular fail-safe just a redundancy.

[allmost]

Dependant on Hawking radiation. The best guess placed on the best guess, placed on the best guess. Doesn’t instill a lot of confidence here.

[ErnstStavroBlofeld]

Not exactly proven, but neither are black holes

Black Holes have been proven.In 2002, the Hubble Space Telescope produced observations indicating that globular clusters named M15 and G1 may contain intermediate-mass black holes.