Saw your post the other day and thought 'that looks slick. Wonder what it is or what it does or how it works..?'
Got a page that covers that? 
I've got some bitcoin, got cold storage, got a lightening wallet and got alby setup on nostr... but I still can't really tell what cashu is or what it does and why (compared to just a lightening wallet), but everybody seems excited about it so I want to figure it out.