You could incorporate that in a quorum blockchain like Stellar (or Ripple I guess), but the whole point of those is that they remove the need for PoW so that's

You could incorporate that in a quorum blockchain like Stellar (or Ripple I guess), but the whole point of those is that they remove the need for PoW so that's a bit useless. Maybe it's a cool way to build trust in such a network though..