I obviously don't know how they are implementing it, but I can easily imagine a simple protocol of requesting a signed message (eg. via Keychain) before an image is provided. Other front ends could choose to replicate the same thing, but it wouldn't play so nicely with those that don't choose to implement it.
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I'm leaning towards an embeddable solution, if it's possible, but I wouldn't know, since I can only develop ideas, not apps.