Let’s say I’m using the Primal wallet. How does someone send me Cashu and how do I send them Cashu? In my wallet, I have sats. This is where I’m confused.

Right .

But potentially much less reliable because you really need to trust the person or entity who’s running the mint will not just shut it down randomly because it’s an unpaid hobby project of theirs, vs. a company offering a custodial wallet as a business.

cashu are ious for sats that get issued by a lightning node called a mint i redeem my ious and the mint pays an ln invoice that shows up as sats in your primal wallet mints are nodes that pay invoices and issue tokens lightning network is the bridge between mints cashu tokens in a mint can be shared without making a lightning payment