onion topic links 2.0

It seems you're looking for information on "onion topic links 2.0." This could refer to several things, including the Tor network's .onion sites, which are used for anonymous browsing and accessing hidden services. However, without further context, it's challenging to provide specific information or resources. If you're looking for information on a specific type of onion routing, .onion sites, or another topic related to "onion" links, please specify and I'll be happy to help!