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Author Topic: Cheap way to attack blockchain  (Read 27915 times)
amaclin
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November 23, 2015, 05:52:33 PM
 #81

I thought this would be against your policy of not spending money on attacks?
I changed my mind
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basil00
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November 24, 2015, 01:02:10 AM
 #82

I changed my mind

At least the attack is proven to work in practice.
moneyart
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November 24, 2015, 04:08:36 PM
 #83

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Governments do not need to "destroy" bitcoin.
Because there is no danger from it.

Governments steal our money but because they have to pay so much interest on debt there is no money left for a bitcoin attack.

By the way, politicians still dont understand what Bitcoin is. Good for us, because when criminals dont understand something they dont want to steal it.
amaclin
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November 24, 2015, 04:44:47 PM
 #84

By the way, politicians still dont understand what Bitcoin is.
You either dont understand what Bitcoin is  Grin
junglist.massive
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November 24, 2015, 08:31:31 PM
 #85

that kind of spamming will be really popular in future. If you add some text to each transaction and send it, it will works same as email spam

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amaclin
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November 25, 2015, 06:47:49 AM
 #86

that kind of spamming will be really popular in future.
doubt
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If you add some text to each transaction and send it, it will works same as email spam
Are you sure that you really understand me? and the point of SIGOPs "block fulling" attack?
Have a look:
https://bitcointalk.org/index.php?topic=1023190.0
http://webbtc.com/tx/300503d19fb80a083723ccfb43d54278f2555838595c3443907156bc9889aeec (stored today)
https://github.com/petertodd/python-bitcoinlib/blob/master/examples/publish-text.py
hetecon
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November 27, 2015, 05:44:18 AM
 #87

Why would you want to spam the blockchain.

amaclin
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November 27, 2015, 05:51:26 AM
 #88

Why would you want to spam the blockchain.
Because I have a right
achow101
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November 27, 2015, 06:54:59 AM
 #89

Why would you want to spam the blockchain.
Because I have a right
No, it is not your right to spam the blockchain, you simply have the ability. Just because I have the ability to rob a store does not make it my right to do so. Same applies here.

amaclin
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November 27, 2015, 07:38:09 AM
 #90

No, it is not your right to spam the blockchain, you simply have the ability.
Just because I have the ability to rob a store does not make it my right to do so. Same applies here.
There is no law, no punishment for doing this.
There are only consensus rules and mining policy in bitcoin.
So, in this case right=ability. These are different apples.  Grin
YarkoL
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November 27, 2015, 05:01:59 PM
 #91


You guys ought to be grateful for amaclin for doing security
testing and even paying for it out of his own pockets.

dev blog https://yarkol.github.io
BTC 18kHb54jqcpWEkuAkCFsGMzR6BMgYnpi2T
amaclin
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November 27, 2015, 09:11:53 PM
 #92

https://github.com/bitcoin/bitcoin/pull/7081
enthus
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November 28, 2015, 02:36:02 AM
 #93

Each such transaction costs 0.00045 for dishonest attacker (can be even less)
88 transactions (attack one block) will cost only 0.0396 BTC
Daily attack 5.7024 BTC - not a big deal

Wanna hire me for this dirty job?  Grin

Main "weakness" for this attack is that miners could easily just ignore those transactions, without involving any hard fork.

Only the pools that accept those transactions *and* that do not prioritize transactions in a block by total fee would be impacted, pools that build their blocks based on max fee they can rack in a block would automatically eliminate them, they may just need to take the SIGOPS limit into their block optimization code, but that's all.

In practice only the "faucet pools", those that accept zero-fee tx and do not prioritize tx would likely feel the attack.

So the practical spamming would be limited to relaying and the mempool, so no biggy.
Yes this is right...once problem is identified it is easy for miners to ignore and fix the attack.
moneyart
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November 28, 2015, 11:57:58 AM
 #94

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You either dont understand what Bitcoin is  Grin

I wrote my Bachelor Thesis about Bitcoin and developed a Paper Wallet site: moneyart.info
I know a lot about Bitcoin.
amaclin
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November 28, 2015, 12:25:47 PM
 #95

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You either dont understand what Bitcoin is  Grin

I wrote my Bachelor Thesis about Bitcoin and developed a Paper Wallet site: moneyart.info
I know a lot about Bitcoin.

hetecon
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November 29, 2015, 01:53:29 AM
 #96

Why would you want to spam the blockchain.
Because I have a right

But why does that make you want to do it? Maybe for attention???

lama-hunter
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November 29, 2015, 02:24:39 AM
 #97

Is it really a atack of the Blockchain  Cheesy or simply a slowment/decrease of included tx?
I just know back in Time hwen an transaction took about 14 Days out from Coinbase Cheesy:D that was akward lol

regards
lama-hunter
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November 29, 2015, 02:27:46 AM
 #98

I would like to thank those that have (re)discovered this attack and shown it to be a viable attack using their own money to prove it.

Is anyone planning a large scale attack using this method?  That would be interesting.

How much would it take to fund a sustained attack, for example a 24 hour period?

Our family was terrorized by Homeland Security.  Read all about it here:  http://www.jmwagner.com/ and http://www.burtw.com/  Any donations to help us recover from the $300,000 in legal fees and forced donations to the Federal Asset Forfeiture slush fund are greatly appreciated!
hetecon
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November 29, 2015, 02:51:52 AM
 #99

I would like to thank those that have (re)discovered this attack and shown it to be a viable attack using their own money to prove it.

Is anyone planning a large scale attack using this method?  That would be interesting.

How much would it take to fund a sustained attack, for example a 24 hour period?

I think it is not ethical to do this attack, but also interested to know these answers for security purpose.

RealBitcoin
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November 29, 2015, 04:44:07 AM
 #100

Shit, the devs shoud fix this asap before the word gets out and FUD-ers start screaming the price down.

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