Is whitish stuff on the surface of dried chorizo safe to eat?

It depends on the type of chorizo and the production process. If you are referring to a type of Spanish chorizo, the whitish stuff is likely a layer of fat that has solidified on the surface of the chorizo during the drying process. This is normal and safe to eat, and can be removed if desired by wiping the chorizo with a paper towel.

However, if the chorizo is not a Spanish variety or if the production process is different, it is important to check with the manufacturer or a trusted source to determine if the whitish stuff is safe to eat.