Otta in the UK (now eaten by the inexplicably-named Welcome to the Jungle) used to have a very involved vetting process during company onboarding, and I could verify that it was a great service as both a candidate and a hiring manager. To replicate what you want ("every listing is verified") there's no silver bullet but a good vetting process like that goes a long way.

Another site I like is cord.com, which seems to prioritise companies where recruiters are active on that website, I've had a good experience with that one as well, as you get to chat with an actual recruiter in a matter of hours or days.