Cheap way to attack blockchain

[amaclin]

I thought this would be against your policy of not spending money on attacks?

I changed my mind

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[basil00]

I changed my mind

At least the attack is proven to work in practice.

[moneyart]

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]

By the way, politicians still dont understand what Bitcoin is.

You either dont understand what Bitcoin is 

[junglist.massive]

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

[amaclin]

that kind of spamming will be really popular in future.

doubt

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]

Why would you want to spam the blockchain.

[amaclin]

Why would you want to spam the blockchain.

Because I have a right

[achow101]

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]

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.  

[YarkoL]

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

[amaclin]

https://github.com/bitcoin/bitcoin/pull/7081

[enthus]

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?  

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]

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]

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]

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]

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

regards
lama-hunter

[BurtW]

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?

[hetecon]

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]

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