Hello,

is NobleCoin suffering an "attack" right now? I have a feeling it's an attack in the sense that a user with greedy intentions is succeeding in obtaining more blocks than would be fair.

Here's what I think is happening, he has around 0.5 - 1GHs of available hash power, and he is using it to hop between coins.

I know that the 1 block difficulty recalculation should make this attempt null, but I actually think it's working. The difficulty is around 20, then it falls to around 13, and slowly climbs back to 20. The problem is that during the slow climb it gives a large opportunity for the user to find blocks with easier difficulty, and when it stabilizes he can simply move the hash power to a different coin while it waits for the difficulty to fall (around 40 min AFAICT).

I don't think there's a quick fix, but the user is actually hurting the coin in some aspects. Firstly, it reduces the coin security (ie. in the climbing intervals there's also a chance that someone will have 51% more hash power than the hash rate of the network without the original attacker). Secondly, it is hurting the transaction time because during the fall-back period the next block can take about 40 min to be found.

Unfortunately, if this really is happening, the only solution I see is to add more hash power. Consider this a call-to-arms for the community! =D

Rofo, if there's no quick fix, don't bother. POS will fix it, and this is just another bump on the road. It's not as serious as the previous attacks, but if true we should be aware of a higher chance of 51% attack.

If such thing isn't happening, then feel free to ignore this post. I just thought it might be a good idea to point out something weird I'm seeing, but I'm still a noob here.

Thanks,

Janito