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So, I assume before you accept one of these things you should validate that it actually contains funds somehow ?

Yes; depending on who gives you the note you might trust that they have done this for you.

We will have iOS and Android apps available (and we will open source them for peer review as well).

"depending on who gives you the note you might trust that they have done this for you"

There is absolutely no way I would trust that - because even if I trusted that person's integrity I would also need to trust that they themselves had the technical knowledge to reliably make that confirmation. And that they hadn't made a mistake.

There is one case, which I believe is a common one where I would argue this might not be true -- a crypto savvy family member is the first person to purchase and load the notes before gifting them to you.

But, fair point. I would always err on the side of recommending someone scan a note rather than not.

Agreed, that's one case where I could see myself trusting someone here.

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