> Having some level of transaction fees could be important for preventing DOS attacks. Agreed. Their mitigation approach is somewhat interesting as well though

> Having some level of transaction fees could be important for preventing DOS attacks. Agreed. Their mitigation approach is somewhat interesting as well though (dynamic PoW [1]). Thanks to the independent nature of the blocks, signing difficulty of the transactions can be raised and lowered dynamically making spam incrementally more expensive for the spammers. [1] https://medium.com/nanocurrency/dynamic-proof-of-work-prioritization-4618b78c5be9 https://medium.com/nanocurrency/dynamic-proof-of-work-priori...