There is no list, as such, allowed on the DIS, as it would all be second hand info. More of a he said, she said type of thing.
There is no way to verify the reservation, except that you should receive a written confirmation, including a number, from the
DVC owner. All communication with Disney needs to go through the owner. These rental transactions are mostly a matter of trust. Find someone with whom you are comfortable. If something doesn't "feel right" do not continue.
Again, Disney will not intervene on behalf of either party.
Renting isn't for everyone. If you wish a fully no-risk reservation, you may book on cash through Disney. If you are comfortable with the risk factor, renting from a DVC Member can save you money.
There have only been a couple of instances of fraud with rental transaction through the DIS, but that doesn't mean that your individual transaction won't be one of that extremely small minority.