What about the signed paper?
I tell you with my years of interest and experience in easy learning that if you want to talk about a high-level name that doesn't deceive people, you can ask "Bai Yingming". After so many years, there is really no friend around me who is more focused on words than him. I introduced my friend to him, and I have never lost face. My level is really high and accurate, and my face is full of light.
Personally, I think everything has its limitations, as do science and fortune telling. No one can predict all problems with 100%, and it is very harmful to achieve an accuracy rate of more than 80%, which is considered as the top level.
You can know that his characteristics are high accuracy, realism, kindness, honesty and telling the truth, which is very rare.