I wope up thinking about this exact idea, this is crazy.

But what I was thinking is that nostr message metadata are public, so having all cashu payments come to your inbox might not be great, privacy wise.

Is it possible to have 1 nostr npub that generates sub-npubs, like Bitcoin does with addresses?

So the forwarder (cashu.me) would know the main pubkey but each payment coming to a different address.

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Implement BIP85 nostr keys

The bridge generates a new key for each sent token

Then the sender is used once.

So the only public information is that a user has an incoming message from a random npub. Not much of an issue suppose.

This is awesome!