> But, if you don't have proofs that match the amount, you would need to go online and swap for the needed proofs at the mint.

This also applies to offline receives.

The sender needs to not only know the recipient in advance, but also what denominations they will use. The recipient can’t give you change back.

Still useful, but that’s another important limitation.

If I create a nut and then send it offline can’t I reclaim it first before the receiver?

BlokchainB

1. Offline wending machines are possible with Lightning, if the payer has internet access.

2. "It cannot contain duplicate proofs (double-spend)" How can an offline receiver verify this? A customized mint can issue Cashu coins not backed by anythig. Cashu are scam.