http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/pt-spec/configuration-environment.html
Example: TOR_PT_MANAGED_TRANSPORT_VER=1,1a,2b,this_is_a_valid_ver “TOR_PT_STATE_LOCATION” Specifies an absolute path to a directory where the PT is
allowed to store state that will be persisted across
invocations. The directory is not required to exist when
the PT is launched, however PT implementations SHOULD be
able to create it as required.