How much is a block trade?

I'm curious about the specifics of a block trade in the cryptocurrency world. Can you provide a detailed explanation of what a block trade is, and how its value is determined? Are there any specific factors that influence the price of a block trade, and how do these factors differ from those that affect regular cryptocurrency transactions? Additionally, are there any potential risks or benefits associated with engaging in block trades, and how can investors protect themselves from any potential downsides?