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Ah! Yes, I see. You'd need to figure out which is "your" half, which the application as it exists today doesn't help you to do since that's not what they're going for. The person initiating would need to send something to establish a conversation, like "Er, hi?" and then once that conversation exists they can verify the number shown on your web page matches half of the displayed safety number as expected and actually proceed.

It's clunky, but less so than I feared. I can actually imagine a person doing this. I mean, they won't, but like PGP this is something a person _could_ do if they were motivated and competent.

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