Ben Laurie made a lot of useful points. However,...
Simultaneous release is (provably?) impossible without a trusted third party.
I don't think I believe this. Or at least, I don't think it's true to the extent necessary to make the original application impossible.
Consider:
I send you money for naked photos of Geri Ryan (that Borg chick with the ASS-KICKING hips). The money is "encapsulated"...you can its there, but you can't get at it.
You send me encapsulated photos, perhaps with thumbnails on the outside.
I see the thumbnails and click to send the pre-release. You see the pre-release arrive and click the release for the photos.
My photo-bundle receives the releases and opens, and then shoots off a message that activates the pre-release on your end, giving you the cash.
Is a 3rd party necessary here? I don't see it, but then again I could be wrong.
-TD
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