Replying to Avatar calle

Ecash zaps:

- Receiver (R) announces on their nostr profile which mints they're on

- R posts something dope on nostr

- Sender (S) mints P2PK-locked ecash from R's mint to R's nostr pubkey

- S attaches locked ecash to R's post

- Observer (O) sees ecash attached to R's note and verifies P2PK lock ("receiver is R") and DLEQ proof ("ecash is legit").

- O's nostr client shows "1234 sats zapped from S to R"
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Max 2y ago

This is missing double spending protection, the same valid ecash could be sent to a bunch of notes of the same author, the sender only looses 1 sat, but an observer sees 100000 sat zaps.

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calle 2y ago

That's true, hadn't thought about that.

It should be easy to commit to the note ID inside the ecash note!

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Max 2y ago

That should work.