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Oh Snap! Canonical now doing manual reviews for new packages due to scam apps
(www.gamingonlinux.com)
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I'm not sure if there's a single document explaining all of that, but this document talks about snap's assertions. I'm not entirely sure but I believe this file contains the main snapd business logic for actually checking these assertions.
On the PPA side I don't even know whether there is documentation for this - it's just the result of my understanding of how apt works and my own history creating PPAs.