Nano is an interesting cryptocurrency, but it’s very benefits are attack vectors. Currently Nano has no way of dealing with a precomputed PoW attack which means a single attacker has the ability to effectively ‘DDOS’ the network. This is briefly discussed in their white paper, and AFAIK I’m the only one to have proposed a complete comprehensive solution to their problem, but the implementation appears to be so complex and would require a network split that the nano team has moved on to less comprehensive mitigations. Currently any actor, including myself with my trivial resources could easily DDOS the entire network, which is a major concern I hold to the cryptocurrency and cannot advocate its usage at least until this has been appropriately addressed.