So it's a Cashu token, but the unit isn't sats, but "ehash"?

And you don't mint them (buying them with sats), they mint them and give them out to the miners in their pool? And they can anonymously change hands? Why is that useful?

And after a while their value (in sats) is determined, and you can swap them for tokens of unit sats, and melt them for lightning sats?