I actually like this idea. A log like the transaction history could be implemwnted. And it would show when u enter or leave a clan. And it would keep track of all clans u have bean in.
That would be rlly cool and not very complicated to do, i think.
Player x joined clan y on xx xx 2014
Player x left clan y on xx xx 2014
Player x joined clan z on xx xx 2014
Etc etc etc.