Some slides on that topic. I am releasing offline tokens feature to nutstash.app this weekend! I plan on writing a short blog about it. Stay tuned!
Anatomy of a nut
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If we can use p2pk locks with ecash when both sender and receiver are offline... that would be ground breaking!
So I am very eager to know more. Currently I can't do it on chasu.me, but I assume there's a technical limitation that I don't fully understand yet. So want to understand more.
thelimitations:
I have it fully implemented in nutstash, will release it on the weekend
It's possible to lock ecash to a pubkey and add signature proofs, to solve this problem. The sender would need to get the pubkey from the receiver first though, which is worse UX.
Receiver can also just redeem after tap, and finalize the transaction after redemption
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Receiver can also just redeem after tap, and finalize the transaction after redemption