Since se­veral peop­le asked: Here is a patch (con­tai­ning my track­back sa­ni­ty checks) against the track­back mo­du­le. Mind that this is just a draft, con­fi­gu­ra­ti­on of the be­ha­viour has to be done in the sour­ce code. The pre­con­fi­gu­red be­ha­viour is to pu­blish track­backs which ful­fill the sa­ni­ty checks; all other track­back re­quests re­cei­ve an error reply. You have been war­ned ;)