Plenty, but you tankies refuse to acknowledge it.

There’s never enough proof for some people. There are Holocaust deniers ffs

As for China, the proof is in the pudding. Can you go there and openly speak about it? Can anyone just go up to the camps unannounced and check? Or can you only go there when and how the government wants, like the Nazis did when they invited the International red cross to one of their camps and made a little movie about it to show how humane they were, and then at the end of the film they simply sent everyone there to Auschwitz?