Imagine you have a computer that uses a delay tolerant communication protocol like NNCP and periodically a drone flies over and updates your file subscriptions using key verification
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Something like spotpass & streetpass for the 3ds would be interesting, but on your smartphone. Every phone has an internal relay, updates notes to/from every person you are in range of. Mesh+Sneaker net. Hyper local Nostr.
SpotPass and StreetPass - Wikipedia