Terracoin Attack analysis
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[quote name=“wrapper” post=“55370” timestamp=“1390788543”]
From the 18th to the 27th January the Litecoin Hash rate has reduced drastically from 120 to 60 GHash/s.This has left the difficulty at a rate equivelent to 114 GHash/s. Thus punishing loyal Litecoin miners by leaving the difficulty twice as high as it should be.
https://coinplorer.com/Charts/Difficulty/LTC
[/quote]doesn’t it auto retarget the difficulty?
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Yes, but the multipool “attack” effect of pool swapping at difficulty change appears massive. Litecoin does not seem to be protected against that, if it is malevolent. I went to look what they say was going on and noticed the Litecoin forum was Capthcha and you had to log in again, so I didn’t see yet.
Today the Litecoin Hash dropped to 2200, but the difficulty is for a hash rate of 3300. To do this the variation looks over 200%, not just 51%.
I have outlined how I think it works, as the multipools are trying to maximise their income at the expense of all other miners. They switch coins with a % of the coins hash rate, to mop up coins cheaper at the previous hash rate / difficulty. Then leave before the difficulty change, leaving the loyal miners with extended block times ie all expensive coins.
Unfortunately for the people getting the coins from the multipool, the pool holder apprears only to deals in Bitcoin, which means they have no interest in wither the coin gets destroyed and all their workers loose their money either. In fact, it would appear to be in their interest, as the workers will have to build up a new coin.
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It looks like coin hoping pools are being used to “attack” Feathercoin. They have driven the average block time up for loyal miners to 2:45 minutes, whilst generating block of 2:00m at difficulty change for themselves. The fact that these pools pay out less is disturbing, as they should pay more and fraud is illegal in most countries.
I really hope this is an algorithm and not malevolent, you damage yourself when you try to damage others.
The granulated difficulty for Feathercoin change is making this harder than Litecoin where 300% attack look like it was mounted. This may be different if the full 70 GHash is used against Feathercoin. How much is this costing?
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[quote name=“wrapper” post=“55496” timestamp=“1390838633”]
It looks like coin hoping pools are being used to “attack” Feathercoin. They have driven the average block time up for loyal miners to 2:45 minutes, whilst generating block of 2:00m at difficulty change for themselves. The fact that these pools pay out less is disturbing, as they should pay more and fraud is illegal in most countries.I really hope this is an algorithm and not malevolent, you damage yourself when you try to damage others.
The granulated difficulty for Feathercoin change is making this harder than Litecoin where 300% attack look like it was mounted. This may be different if the full 70 GHash is used against Feathercoin. How much is this costing?
[/quote]Wouldn’t this be avoided if Feathercoin tries to retarget the difficulty every block?
I’ll switch back to solo/pool mining if necessary, instead of multipool. -
That means extra calculations for the miners and a big change that is likely to cause blockchain forks, any solo miners or pools who didn’t change over could be punished, if they end on the wrong blockchain.
We are proposing testing some things around extending the number of time zones used to calculate the Block average time and the difficulty. In emergency we would issue a hard fork update to all miners.
Maybe creating a miner alert (pm list) would be good preventative action for a possible hard fork?
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[quote] Voice of Russia
However, some say it’s (Feathercoi) is a poorly made copy of Litecoin. We’ve got a comment by one of the administrators at bitcoinexaminer.org, Ian Irving.
There have been many instances when it’s been subject to various attacks. A lot of people don’t think it’s very stable. Its key feathure is that it’s very fast. [/quote]
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According to https://coinplorer.com/Charts/Difficulty/FTC
Feathercoin has been subject to 14 GHash network “attack”, combined with the scams, forum attacks. No coincidence?
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Interesting… Do you have a theory?
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http://www.youtube.com/watch?v=bTPQKyAq-DM
The questions are interesting after 45mins onwards especially.
I have no theory, just watchin some charts. Hoping someone would enlighten me. If there’s a bank robbery going on, its worth having a look.
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Feathercoin 3.2 GHash /s 01:29am OK so far.
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Feathercoin 10 GHash 16:00om 29th not OK. Block 157559
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Looks like someone is DDOSing middlecoin right now. I have been getting disconnected to the pool for the past few days.
How ironic that the attack pool is being attacked :'(
The usual 0.02 BTC to 0.01 right now :-[Back to mining Feathercoin directly via give-me-coins until this is stabilized :)
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We are being attacked now, see the stats… 2:28am - 8 GHash/s
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Just down to 6.2 GHash/s 1:30min Block time. They are using 4 GHash/s this time.
Still 2 hours to re-target.
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[quote name=“eaxvac” post=“55961” timestamp=“1391048169”]
Looks like someone is DDOSing middlecoin right now. I have been getting disconnected to the pool for the past few days.
How ironic that the attack pool is being attacked :'(
The usual 0.02 BTC to 0.01 right now :-[Back to mining Feathercoin directly via give-me-coins until this is stabilized :)
[/quote]middlecoin would be the size of the “attacker”, It has ranged from 3 GHash/s 4, 10 and 13.
If this is how all these multipools work then they are deliberately 51% the coin networks to mine coins at disproportionally faster rates than loyal miners. Stranding miners at a high difficulty, and swooping in again with 51% when the loyal miners have dug out the seam with a low block rate.
I thought that pools deliberately taking over 51% of the network was frowned upon? re: GHASH.IO
It is especially tragic that FTC supporters might be in that pool and are “attacking” their own coins loyal miners. It reduced the chance of a coin so much on the 27th that the p2pool did not earn a coin. That is obviously going to be deliberately destructive and leaching on the loyal miners in the network.
No, I don’t advise multipools, if this is the way they work they don’t support the coins they mine.
I also think paying out in a competing currency has ethical issues I would be unhappy to be involved with and is open to abuse unless completely transparent.
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Awareness
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[quote name=“wrapper” post=“55968” timestamp=“1391049794”]
It reduced the chance of a coin so much on the 27th that the p2pool did not earn a coin. [/quote]Only just managed to get back to looking at whats been going on properly this morning and noticed this, I was starting to look around to see what was going on, did my P2Pool node fail or something similar, then I found your post. I’m glad it wasn’t just my pool, but not glad there is a company out there killing coins the way they do.
UM
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Does this benefit them or just hinder everyone else?
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By doing a manually adjusted 400% attack an evil pool can get coins at 1:00m intervals, obviously, they get 4 out of every 5 coins for that period.
They are mining at 1/4 difficulty of all other members. This then forces up the difficulty so loyal miners are left mining at 3:30m block intervals and win 50% less blocks because they are mining at a higher difficulty.
They say they are mining the most profitable coin, but the “profitability” can also be manipulated as well, to the evil pools advantage.
Lets hope they were hacked. It would make me ill doing this, not happy. Another case where a nice business isn’t good enough for them, and they’ve got to screw people to be satisfied?
I really hope I’m wrong and they come on here and apologies and say it was an automatic algorithm gone wrong, some hope…
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I’ve just noted, the increased hash rate of the “multi-pool network attack” also brings forward the expected re-target time.
It was due at 18:00pm with loyal miners, now it is 17:00 GMT.
