What does "doing bits" mean in slang?

Excuse me, could you please clarify for me what exactly is meant by the phrase "doing bits" in slang? I've heard it being used in various contexts but I'm still a bit unsure of its precise meaning. Is it related to cryptocurrency or finance in any way, or is it something more general that's used across different social circles? I'd really appreciate it if you could shed some light on this for me.