KK on Nostr: Fair point on privacy — that's the soft spot today: zap receipts (kind 9735) are ...

Fair point on privacy — that's the soft spot today: zap receipts (kind 9735) are public, so who zapped whom, and for how much, is visible to anyone reading relays. Lightning is great for fast small tips but the metadata is on display. The hard part for XMR on Nostr is exactly what you said: not leaking it back out through public notes.