Legal precedent demonstrating that evidence for the Holocaust holds up in any modern court of law, clearly meeting legal definitions of murder and genocide on an international level:
https://www.lnlegal.com/blog/2014/august/what-evidence-does-the-prosecution-need-to-prove/
https://play.google.com/books/reader?id=FcpGAQAAMAAJ&pg=GBS.PA453
https://www.nationalww2museum.org/war/topics/nuremberg-trials
https://www.theholocaustexplained.org/survival-and-legacy/postwar-trials-and-denazification/
https://statista.com/topics/9066/the-holocaust/
https://www.nationalww2museum.org/war/articles/crimes-against-humanity-international-law
https://www.ushmm.org/genocide-prevention/simon-skjodt-center/work/ferencz-international-justice-initiative/transitional-justice/international-criminal-justice-since-nuremberg
https://digital-commons.usnwc.edu/cgi/viewcontent.cgi?article=1481&context=ils