Reading through the Whitepaper it seems that the devs took Bob McElrath's "Braiding Bitcoin" idea and solved the consensus problem by using trusted nodes (like Ripple) instead of an algorithm.
So it's basically something like Ripple but using a DAG instead of sequential blocks.
Kudos for starting somewhere, but this isn't a decentralized solution and is vulnerable to sybil attacks.
in the parts 4. Double-spends / 5. The main chain / 6. Witnesses of the whitelist u can see reviews for these cases.
I read those sections, but (the way I understand it at least) at some point the network still relies on trusted nodes to function, leaving it wide open to sybil attacks. The whole point of Bitcoin of course is that no nodes are 'special'.
Here are some quotes from the whitepaper: