http://ttevhjjsjxz6uqqcjkbig5cycd7n7xv7cmd6f5fcvrqaaa7f3bj36wad.onion/technology/security/pow/index.html
With the PoW defense, attackers effectively work against themselves: the more
attackers hit the service, the harder it gets to hit the service. How do I know as an end-user that an Onion Service is under stress? ¶ As of August 2023, sites under stress will either be slow or even time out, but
without a user interface indicating that the PoW protection is active.