Trust-based. You can do that with on-chain transactions, too. These, too are trust based. In both cases, if the sender decides to undo the payment, he can if he manages to get internet first.
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Even with P2PK-locked receiving?
Pretty cool, seems its locked to an address. I studied the base math behind ecash, but haven't read this detail. I wonder how this is achieved.
Just verified myself.
Sender (my laptop) can't clawback the payment because I went out of my way to lock the ecash to the public key of the recipient (my phone).
My phone (offline) has a "later" button when receiving offline.
It shows up in my offline phone's transaction history when press the receive "later" button. But you can see at the time how much the ecash token is worth and the fact that it is locked to your public key (can't be redeemed by anyone else before you can get to WiFi).
Offline instantaneous receiving of sats that are tied to your public key. Amazing.
