Is the Nothing at Stake attack relevant for Simcoin? If yes, how do you plan to solve it?
I don't follow n@s arguments too closely, but from what I can tell the problem stems from the same BCNext blunder I've already pointed out: using PoW atavism - the blockchain - for a PoS coin. Sure, it's much easier to program, but, as we can see, gives you a lot of problems down the road.
People worry that since the blockchain is not protected with PoW, an attacker could generate an alternative chain by buying old private keys and then present this chain to the network as a better alternative.
Information about how exactly NXT forging works is very confusing and scattered across multiple forum posts, so I can't tell whether such attack is viable, but seeing this new talk about Economic Clustering (
), the threat might be real.
In Simcoin there will be no blockchain, so old private keys are useless. To make any changes you need to own the majority of stake
in the present.