A novel about blind people's secret fortune-telling skills.

What certificate can blind people use to tell their fortune?

I ching certificate. According to Baidu Encyclopedia, blind people can use the Book of Changes. The Book of Changes is a certificate recognized by the national government and has a legal basis. I ching certificate is a professional ability certificate obtained by students after careful study. I ching certificate can prove my qualifications and level in this field, and it is a symbol of excellent technology.