The authenticity and accuracy of modern historical records can be determined by historical records, descriptions and archaeological excavations. At the same time, with the help of some high-tech means, no one is a god and it is impossible to know the ins and outs of everything. If people don't want you to know, you may not know, so study history and try to restore the real history with the existing information. Without information, it will be much worse, so I think there will never be a real history, only a history that can be close to the real truth.