maybe check in
https://developer.gimp.org/api/2.0/libgi...pitem.html which says
A tattoo is a unique and permanent identifier attached to a item that can be used to uniquely identify a item within an image even between sessions.
https://developer.gimp.org/api/2.0/libgi...pitem.html which says
A tattoo is a unique and permanent identifier attached to a item that can be used to uniquely identify a item within an image even between sessions.