Is there a reason why Duckdice.com is not on list? Is it because they cant be verified? I noticed they have the word provably fair.. thinking they were certified by the site..
They don't have a "total wagered" statistic so I can't add them. Besides that, they had a bit of scammy bonus so that
could be another reason for me to not add them (but I didn't read all details.)
However, all of that has nothing to do with provably fair. I guess you might just be talking about a provably fair verifier? They could be still perfectly provably fair (I didn't check yet.) On quick look they do use a nonce-implementation and that generally is really provably fair. Just make sure to verify your bets, their third-party verifier seems fine:
https://codepen.io/anon/pen/bwJLjj