> On 11 May 2015, at 12:10, insecurity@national.shitposting.agency wrote:
> 
> On 2015-05-11 10:34, Peter Todd wrote:
>> How do you see that blacklisting actually being done?
> 
> Same way ghash.io was banned from the network when used Finney attacks
> against BetCoin Dice.
> 
> As Andreas Antonopoulos says, if any of the miners do anything bad, we
> just ban them from mining. Any sort of attack like this only lasts 10
> minutes as a result. Stop worrying so much.

This doesn't work because a large-scale miner can trivially make themselves 
look like a very large number of much smaller scale miners. Their ability to 
minimize variance comes from the cumulative totals they control so 10 pools of 
1% of the network cumulatively have the same variance as 1 pool with 10% of the 
network. It's also very easy for miners to relay blocks via different addresses 
and the cost is minimal. The biggest cost would be in DDoS prevention and a 
miner that actually split their pool into lots of small fragments would 
actually give themselves the ability to do quite a lot of DDoS mitigation 
anyway. If no-one is doing this right now it's simply because they've not had 
the right incentives to make it worthwhile; if the incentives make it 
worthwhile then this is pretty trivial to do.

This is one area where anonymity on behalf of transaction validators and block 
makers essentially makes it pretty-much impossible to maintain any sort of 
sanctions against antisocial behaviour.
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