http://tttyx2vwp7ihml3vkhywwcizv6nbwrikpgeciy3qrow7l7muak2pnhad.onion/History.html
A detailed
specification of the data structures can be found here . Hooks for inband signalling to enable communication with routers
along a route, e.g., for long range padding, route hopping, etc. are
put in place.