Re: [ANN] [POW] [MSR] Masari - private, untraceable, and fungible cryptocurrency
This is just a guess, but I think they're exploiting the lag in Masari's re-target time. If you make a huge spike of hash for a little bit, you will get blocks very fast because the difficulty won't rise right away. Then, once it is risen, you pull your hash and let other people mine on high difficulty for very slow blocktimes, until diff comes back down. Then you repeat.
We've considered reducing the difficulty window from 24 hours to 12 in the next protocol upgrade. If these persist, we can schedule a protocol upgrade sooner than originally planned and this should help mitigate the situation. We will also be looking at alternative difficulty calculations that can better handle these pumps.
A major priority for Masari is to have a consistent hash rate in the 10s of MH/s, which will protect against these kind of attacks. Having these problems means that the Masari's growing, and dealing with these issues is what will make the network stronger!