Nostr Web Client

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Killer use case of Cashu. This is how it all started: digital postage stamps.

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what's the difference between this (great) idea and messaging over lightning?

Bitcoin lightning network is one financial network, maybe too expensive to be used as normal communication.

I tried cipherchat.app but even without it you can send and receive messages with keysend...

Can this method also be adopted later to be implemented in the Nostr client for the DM feature, instead of having to install other applications?

Yes, that's exactly what Keychat is doing.