Homemade Sausage Making

I just finished a batch of soppresseta. can I just wash off the mold, leave the casing on and hang it in the basement?
I dried it to @ 38% of the green weight as I like it on the dryer side. Also it is pretty arid where I live.

Will it continue to dry and become too hard?

Yes it will continue to dry. Best way to store is to remove the casing,vac-seal and refrigerate.

I agree with Bob. Leaving the casing on is a recipe for an ugly looking product and leaving it to dry will lead to it becoming really hard and losing much of its good flavor.