When you say between 2 phones do you mean without internet access?
Discussion
How could you do it without internet?
You could persist it in the postbox. It would show as “pending” until you get online again.
Could it bounce like a bad cheque?
What prevents double spending?
A lot more difficult! But I think I recall SMS was used to send payments in Africa. But if we assume they’re both connected that makes it easier if that is indeed the case.
Yes, offline, http://8333.mobi/ via feature phones and sms functionality. Here #[8] explains https://youtu.be/yknBN08hWOY
Speaking of Machankura: what if a nostr client low data / offline mode has send sms to nostr note + publish service & functionality
Have you seen #[5] ‘s PoS? The merchant can take payments on a very simple (cheap) device with no internet connection. The person paying (who has internet) shows the merchant a PIN that the merchant can confirm means payment was made. Very nifty.
Wow, might benefit from numerous payment pathways for both, either/or, neither having a connection to give greater robustness.
Can run various paths by priority.
But anything is better than nothing.
Quite nice to blend irl commerce with ecommerce with social.