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by duskwuff
521 days ago
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Telegram doesn't use local CDNs for caching. All users are associated with one of about five telegram DCs, and upload files to their local DC. If a file was uploaded by a user on another DC, users connect to it temporarily to download the file. The DC that a user is associated with is exposed by the API - you don't need to get them to upload a file to discover it - but it's so broad that it's not much of a deanonymizing signal. (Knowing that your target is in DC1, for example, just means that they're probably somewhere in North or South America. Or that they registered using a phone number that said they were.) https://core.telegram.org/cdn |
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