Sure - They have a novel BLS signature aggregation that allows for a much larger number of participating validators (roughly up to 1M) then other POS systems t

Sure - They have a novel BLS signature aggregation that allows for a much larger number of participating validators (roughly up to 1M) then other POS systems that top out at a couple thousand. - It's slashing mechanism creates 'economic finality'. Any validator participating in a reorg beyond that ~12 minute economic finality window would find themselves slashed and forced exited from the validator set. - Lengthy entrance and exit queues mean that the validator set can't be shifted faster then the community can adapt should an attacker try manipulate the network. - Multiple independent client teams have implemented a publicly agreed upon specification (there are 6 known at the moment). This keeps insider developers from sneaking in adverse changes without causing a huge hullabaloo. Getting all this right is why it's taken so long to roll out.