Nexus claims to be
http://www.nexusearth.com/In addition to checks and balances in consensus and Trust Keys with Network recognized Reputation providing greater security and network stability, Nexus also has Quantum Computer Resistant Private Keys with 571-bit encryption (much more secure than Bitcoin). Meaning, Nexus serves the WORLD as the most secure cryptocurrency to date.
I also thought I heard someone from Heat talking about this but I'm not sure if Heat is (maybe)