I just watched the  nostr:npub1rxysxnjkhrmqd3ey73dp9n5y5yvyzcs64acc9g0k2epcpwwyya4spvhnp8 overview on cashu, and I think I get it. It's not sats directly, but it's a token that can be used to make payments within an ecash node that carry the same value.  I haven't gotten deep enough to need this myself yet, but I'm glad it exists.

Thanks for responding!