Hardened BSD

Hardened BSD appears in Real-World Onion Sites, a public list maintained by Alec Muffett of established organisations that run an onion service, under “Tech and Software”. The list currently records one onion service for it and only includes sites that can show a link between the onion address and the organisation.

The organisation publishes that proof on its own clearnet site, linked in the references. That page is also what automated availability checks on this profile refer to.

Where an official address is on file it is shown on this profile with its source; compare it with the organisation's own site before relying on it.