What is the blackest major city in America?

I'm curious, what criteria are being used to determine the "blackest" major city in America? Is it based on demographics, cultural identity, or perhaps something else entirely? And furthermore, how does this question relate to the field of cryptocurrency and finance? While I understand the curiosity behind such a query, I'm more interested in how it intersects with our area of expertise. Can you elaborate on the connection, or perhaps provide some context for why this question has arisen?