Do you know or did you know which is correct?

As a professional in the field of cryptocurrency and finance, I often encounter questions that require precise language and clarity. So, when it comes to the phrase "Do you know or did you know which is correct?", I'd have to pose the question in a way that prompts for clarity and understanding. "Excuse me, but I'm curious. When discussing past events or situations, should we use 'Did you know?' to inquire about something someone may have been aware of in the past, or is 'Do you know?' the more appropriate phrase when seeking information regardless of when it was acquired? Which one is more accurate in conveying our intention to clarify knowledge or understanding?