


This article is written in respect to version 0.4.6. OnionCat4 refers to the versions >= 0.4.x of OnionCat which is found on Github (). OnionCat4 comes with a distributed hosts database based on the DNS protocol which allows OnionCat nodes to dynamically exchange. This article gives on overview why the newer hidden services almost broke OnionCat and explains the adaptions that have been made with OnionCat4 to work as smooth as possible again even with the newer version 3 of hidden services. This had a severe impact on the functionality of OnionCat. Most importantly this is the replacement of Tor’s hidden services version 2 by the new hidden services version 3. Since the beginning of the development of OnionCat in 2008 a lot has changed.
