What is the hardest UC to get?

I'm curious, could you elaborate on what you mean by "UC" in the context of "What is the hardest UC to get?" Are you referring to a specific university or college, an undergraduate certificate, or perhaps something related to cryptocurrency or finance? If it's related to education, then it would depend greatly on the institution, the program's popularity, and the requirements for admission. For example, some prestigious universities or highly competitive programs may have stringent academic requirements, demanding entrance exams, or limited seats available, making them more difficult to gain admission into. On the other hand, if you're referring to something in the realm of cryptocurrency or finance, I'd need more context to provide an accurate answer.