What does brain tech do?

Could you elaborate on the term "brain tech" and its potential applications in the field of cryptocurrency and finance? As a professional practitioner, I'm intrigued by the intersection of neurotechnology and financial markets. Could brain tech potentially enable us to make more informed and rational investment decisions? Or could it be used to detect and prevent fraudulent activities in the cryptocurrency space? What are some of the ethical considerations surrounding the use of brain tech in finance? Your insights would be greatly appreciated.