List of Historical 51% Attacks on Altcoins

[cunicula]

I'm curious about the history of 51% attacks.
Is there any resource documenting all known instances of these events?
If not, could people indicate dates of attacks and the affected coins here.
It's probably a useful resource for others too.

Data so far:

Terracoin      Date: July 24, 2013 |  Reference: https://bitcointalk.org/index.php?topic=261986.0 | Assumed Motivation: Financial | Tip: meta.p02
Coiledcoin     Date: Jan 5, 2012   | Reference: https://bitcointalk.org/index.php?topic=56675.msg675166#msg675166 | Assumed Motivation: Personal | Tip: meta.p02

[1714171607]

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[1714171607]

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[1714171607]

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[miffman]

I know there was one on world coin, and somehow I think also on novacoin, can't remember tho

[cunicula]

Dates would be helpful too. I'm working on a model that could be used to predict the likelihood of a 51% attack based on economic fundamentals. Thus I'd like to to know the timing as well.

Basic idea is that financially-motivated attacks are most likely when there is a large percentage of hashing power that is only marginally profitable.

Also attacks on the leading GPU coin (litecoin) or the leading ASIC coin (bitcoin) are unlikely, while attacks on follower coins are much more likely.

As for attacks on PoS coins, financially motivated attacks are unlikely, but attacks driven by a personal motivation could occur. I'm curious about this possible attack on Novacoin.

[meta.p02]

Coiledcoin (attacked by Luke-Jr), Terracoin (attacked by 1.2TH) among others. There was an attempt to gauge the likelihood of a 51% on LTC but it proved futile since the potential mining revenue was much more than revenue from 51%.

[cunicula]

I know there was one on world coin, and somehow I think also on novacoin, can't remember tho

Links on world coin and possible novacoin attacks anyone?

[cinnamon_carter]

powercoin killed 51% attack
and
feathercoin survived 51% attack

[cunicula]

powercoin killed 51% attack
and
feathercoin survived 51% attack

dates? links?

[pmconrad]

Links on world coin and possible novacoin attacks anyone?

http://worldcoinforum.org/topic/456-confirmed-51-attack-double-spend-attack-on-worldcoin/

[iampingu]

Feathercoin's 51% attack was like 2 days after the terracoin attack. Not sure who by, but it was probably financial gain.
Can't link to reference, since I only have it on a notepad

[bitdwarf]

I'm not that knowledgable on bitcoin. however I read this on a different thread:

"51% is real, back in 2011 it was more common on the alts. DoubleC was hit a couple a times on his exchange. Geistgeld 1 and Fairbrix were both 51% hit, so was the original Solidcoin and I belive I0coin several times"

[junshong]

feathercoin was the one that survived. Not sure about the details

[sumantso]

FTC suffered multiple 51% attacks - I think 3 - though there wasn't any successful double spend. You can find all the details in their forum.

WDC had a double spend a couple of weeks back, but it was rolled back. In short after all the trouble attackers didn't have any successful double spend attack on either FTC or WDC.

[meta.p02]

Feathercoin (pdf, images)

[adoalli]

Feathercoin (pdf, images)

[cinnamon_carter]

How about spicing this thread up with coins we would like to see suffer a 51% attack ?

I would not shead a tear if Dodge was taken out.  Permanently. 

Poor design, hiding behind cuteness is a coin that in my eyes was carefully planned for a long time to attack the credability of other scrypt 1024 coins that have true potential including litecoin and feathercoin.  Also it makes btc look like a joke.

If I was working for the banking system and I wanted to hurt bitcoin and other currencies I would have designed something just like this.

Forks often.

Unlimited coins forever so guaranteed to be worthless.

The amount of bitcoin spent on pumping it to get it started was big and so was the hash power rented and bought to keep it going so no expense was spared. If you believe it was an accident dream on, the number of fake posts here, on twitter and everywhere stink bad.

The only people who can possibly benefit from this is the exchanges since volume is high on this and I have been watching alt coins and bitcoin and am very knowledgable about financial markets. the volume of trading is too high.  Someone continues to invest a fortune in bitcoin to keep this going.  I call this a pro hit job designed to confuse and spam up the whole scene.

I don't want to see innocent people who for some deranged reason invested in this lose thier money.

Maybe some heavy hitters can set a date in the future and just put it out of it's misery.

I know there are too many coins.

I know things are out of control.

Most will just die off and many have.

I take cryptocurrency very seriously.

I am not in it for the money , I think cryptocurrency , btc, the whole thing can make the world a better place in  many ways.

This is the only coin I dislike.  I am critical of some others , generally premined coins but this coin deserves to be put down.

I am not threatening to do this myself nor could I. All I am saying is if it happened I think it would be very good for the scene.

[frenchBulle]

That was really informative. I have limited knowledge but do you think a feature like the 3D Blockchain from Nexus project could make those kind of attacks impossible?