You can just encrypt eCash with PGP and send it over Nostr.
Discussion
Did you see the npub locked ecash? That's pretty cool too.
Yes I saw the note, but haven't tried it yet
-----BEGIN PGP MESSAGE-----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=LAAC
-----END PGP MESSAGE-----
You can just use Steganography to send ecash in a sound file over nostr
"What's that?"
"That's the sound of money."
