Is it legal to create your own logo?

Could you please elaborate on the legality of creating one's own logo in the context of cryptocurrency and finance? Specifically, I'm interested in understanding if there are any legal restrictions or considerations one should be aware of before designing and adopting a logo for a cryptocurrency project or financial service. Additionally, would it be advisable to seek legal consultation or register the logo with a trademark authority to ensure its protection and legitimacy? Clarifying these points would be immensely helpful in navigating the legal landscape surrounding logo creation in this field.