http://xmrhfasfg5suueegrnc4gsgyi2tyclcy5oz7f5drnrodmdtob6t2ioyd.onion/onion-services/advanced/dos/index.html
Due to license requirements, the PoW v1 client puzzle libraries ( Equi-X and HashX by tevador, both under the LGPL-3.0) are enabled only if tor is compiled with --enable-gpl .
This can be confirmed by running the following command: tor --version
Tor version 0.4.8.3-rc.
This build of Tor is covered by the GNU General Public License (https://www.gnu.org/licenses/gpl-3.0.en.html)
Tor is running on Linux with Libevent...