I did an Android local relay app, it is called Topaz and you can download it here: https://github.com/fiatjaf/topaz/releases/tag/v0.0.1
https://nostr.media/95a0571dc42e5aaf4c55213d698169f14ce74c3cc39...
Why kathu though? You could have just used quartz in native kotlin. 🧐
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