Hi, Mom!ππ«π
There is a thing called eCash, and I've just begun experimenting with a kind called Cashu, that uses "mints" to enable offline exchange of receipts for bitcoin.
It looks quite promising for local circular economies, though there are tradeoffs.π€π§
Check out/follow calle ποΈβ‘ποΈ (npub12rvβ¦85vg) for much more detail...π