For those who don't know, there is an extension to the bittorrent specification (multitracker mode), which defines an optional property called announce-list - link
The announce list property, if present is supposed to replace the standard announce property, which means the clients must ignore the main announce url and use the list of urls (this is the announce-list)
What I am wondering is how to handle this property in my tracker, for now, I'll just unset the announce-list (wipe it out ). So if any ideas, go on.