I figured out how to send encrypted seed phrases over radio.
This could be used as a means of offline payments.
It would work equally well with symmetric or asymmetric encryption.
It was a fun project
You can do it with a hash preimage instead of a seed phrase for atomic swaps ;)
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It would work with any data
The idea would be:
I owe you $10.
I make a wallet, drop $10 in it.
I transmit the seed phrase to you.
You decrypt the text file.
Now you have $10 in bitcoin