Swirlds claims they can create the next generation of distributed consensus through their hashgraph platform. While still promoting fairness and distributed trust, it is also resilient to DDoS attacks. However, it does not require proof-of-work to achieve any of these goals, which makes it rather peculiar.The associated whitepaper does not mention specifically how the company delivers this technology

http://bitcoinist.net/swirlds-blockchain-limitations-hashgraph/