Bitcoin Forum

Eventually, the blockchain will be hacked.
I know it is decentralized and the hacker needed to have control over 51% of the network to 'hack' it! BUT, like any other hack, maybe there is a way we don't know about YET! Everything is 'hackable' from the moment it is online!

What do you think about this?

Yeah.

Eventually we will land on the sun. one day it has to become dark. then we can land.

1. We don't know what we don't know.

2. You can't disprove a negative (we can't prove there is no way to hack Bitcoin)

3. It seems less likely it will be hacked the longer time goes on, as I'm sure smart people
are trying because of the monetary incentives.

I think you don't understand how Bitcoin works.

The whole idea is: essentially there is nothing to hack. Everything is public, transparent, open, and shared. Everybody knows everything. There is no feature or part in the software whatsoever that is supposedly 'hard to hack', that some day some smart ass hacker might break into.

let's be a little bit crazy here: imagine a virus that propagates through mining software and eventually reach 51% of the network silently! By that time, the 'hacker' in control, would change/manipulate the transactions...

Even if something seems safe today, that doesn't mean it will be always safe!

Yeah... and on that day, people will be able to crack ECDSA on their wrist watch... so any of the old folks that didn't swipe their UTXOs for the last 100 years will be exposed to the now weak, ECDSA algo.

So remember kids... don't forget to swipe your wallets in the year 2525.

No.

https://www.youtube.com/watch?v=ZloHVKk7DHk

but then there wont be any people...

as for the blockchain being hacked i believe it wont happen as its nearly impossible to control half of the whole network for 1 human or company

http://statoshi.info/dashboard/db/unspent-transaction-output-set

UTXO expire after 1008 blocks if not incorporate in blockchain.

thank you for that. i will watch it.

No it won't.

Here is my take on it.  If I hack the blockchain, and do something nefarious (double spends, steal coins, or whatever), then the security flaw will be noticed pretty quickly.  So what happens?  I think that bitcoins quickly become worthless.  So there is no point to hack it, because there is no financial incentive.  This is why I think hackers are more likely to focus on hacking exchanges or individual's wallets in stead of trying to hack the blockchain itself. 

Did that ever get approved?

https://bitcointalk.org/index.php?topic=102355.0;all

Does that mean that million satoshi coins are expired?

In my opinion the stress tests that resulted in the nodes coming to a crawl was a HACK, it showed the problem with a public ledger and minor volume.

You look at the big picture, Visa and Mastercard doing hundreds of millions of transactions a day.

A small amount of transactions compared to global CC transactions choked nodes so the system came to a crawl.

Now some want to point to the stress tests and say, we survived, others that understand it shake their head and say btc was exposed how fragile it is to just transaction volume, not total amount of coins but just minor transactions volume, who cares if it was cyber dust amounts being sent, etc, they sent minor transaction loads and the nodes took forever to process all those tiny transactions.

Now scale it up, a billion people with btc and they try to use the coins, and they put millions of transactions into the public ledger in an hour, choke, choke, choke, DIE.

Nodes can't handle global volume for a global currency, the stress tests proved that IMO.

Yet btc is still a quaint little internet currency type of thing, it has value, people use it, people support it, will it ever replace CC's? Nope the stress tests proved that.

The entire life of btc, the ledger hasn't done the transactions in number of actual transactions the big CC networks do in a day.

As soon as a group LEANED on it, it came almost to a halt, stress test was the HACK and btc failed.

What do I know? Let's see an expert top .2% ranking on #bitcoin on twitter, yeah I know nothing about bitcoin, yet in SM I'm top .2% of anyone talking about bitcoin. We covered the stress test lightly, didn't trash btc too much, but if you had a brain and read our articles on the stress test you understood it was a HACK and showed the Achilles heel to btc, the public ledger and high volume of actual transaction requests.

So in regards to the topic, will be hacked? WRONG

It was hacked by the stress tests and the volume problem with btc was fully exposed.

Couple of years ago I read a book outlining the stress test and the author explained the public ledger and volume transactions with independent nodes would be the way the system fails.

So the things that made btc, ends up being why it can't become a global type of currency that replaces stuff like CC's.

My 2 cents on if btc can be hacked is IT WAS when the stress test slowed the nodes down to quicksand speeds.

There was a bug in the early days that someone exploited to generate ridiculous amounts of Bitcoins. It was fixed very quickly and Bitcoin's still here. If a similar bug is found and exploited in the future it will do more damage because more people rely on Bitcoin today, but I expect it will be fixed very quickly and Bitcoin will survive it.

I have to agree that it is a impossible task. As someone said for any one group of person to control 51% is a task that will will prove very costly.

If bitcoin is used by billions of people the number nodes will grow in proportion to the people using it. And bitcoin can still handle the transactions.

Well, there are many block chains and bitcoin is just one.  But if the bitcoin blockchain were hacked in a DDOS sense then it would be devastating blow to all crypto.  The thing is that it would take a monumental effort on the part of many hackers.  I just can't see that happening.

It's like saying the population of earth will be completely wiped out by nukes.  Possible? Yes.  Probable?  No.

i believe that there is no system is safe, so if the blockchain will be hacked
what would happen with our bitcoin? i think bitcoin is gonna worthless
and thats why there is no best supose to hack blockchain maybe hacker more prefer to hack exchanger.
But i think there are smart people that working behind blockchain and have been thinking about the risk if the blockchain would be hacked.

Wrong

Miners are the nodes and wasn't nodes going down due to some states they were in are not node friendly.

Plus it doesn't matter how many nodes are writing to the public ledger as the stress test showed, the transaction volume choked it, there's plenty of nodes but the system wasn't designed to handle millions and millions of transactions in a day.

The type of OS and software and hardware you need to do mega million transactions a day are not the type of hardward most nodes run on.

The visa/mc system uses super computers and miners are not using super computers.

You want to play in the big leagues and handle MILLIONS of transactions, you need high end software and hardware, and the stress test showed it.

Try to download the public ledger now, it's huge and it's not even a busy day for visa or mc

Just see what happened when some minor volume in small transaction did to the whole node network by researching bitcoin stress test.

The only reason btc had huge potential was it was viewed by some to have global currency potential, it can't, nodes on minor league software and hardware all reporting to the same single public ledger cannot do MILLIONS of daily transactions, the stress tests proved that.

So btc as is, cannot grow into a global anything, it is now going to be a quaint footnote in history as the first attempt to use a public ledger and mass node network, but due to limitations of the design, it became obsolete.

The next crypto that might have a shot at global use, will have to have maybe a dozen regional super computers managed by a neutral group operating in literally a net above the net using a new type of crypto designed by AI level computers.

I've seen some proposals for this type of new crypto and it's all based on neutral super computers in a UN type of approved regions where 12 super AI level computers can track a global currency unit, it's gonna come from a centralized body like the UN not from some group with a fake name and no one to publicly present to the world why a global new currency unit is needed.

I've got years into btc, been taking it for years, I still take it today, only now I don't hold any of it, no long term growth IMO.

Opinions are like you know what, but my opinion comes with a .2% EXPERT RATING on Social Media.

Here's my credentials, I'm expert on quite a few things and bitcoin is one of them.

So it's been HACKED and the nodes can't handle a global demand, period, bitcoin is over but for now it can still be turned into fiat until a UN backed global crypto comes along with a global group managing it.

http://www.1growthhacker.com/images/bitcoinklout.jpg

I'm getting a bit tired of your alarmist and ridiculous claims.

Perhaps consider learning a bit about how bitcoin actually works before you make grand statements that are clearly silly.

Here's a hint.  If you think your sentence needs multiple exclamation marks (!!!!), then you probably haven't taken enough time to learn about what you are saying.  It makes it sound like you think you just thought of a problem that nobody else has ever though of or discussed in the past 7 years of bitcoin's existence. A small amount of time with a decent internet search site (such as Google) will quickly allow you to read up on the thousands of conversations that have already occured on these topics.  That way you can make your own decisions based on knowledge rather than spouting off alarmist nonsense and waiting for someone to waste their time repeating old conversations in order to educate you.

I like how you chose the word "eventually" for something that could never happen.

Sollog aka sol adoni troll, is that you?

This is not interesting.

To the best of our understanding it will not, baring 51 or technology we do not have yet. And these have been discussed a million times already.

the same thing is true about getting hit by a meteor


what bug are you talking about?
the only problem that i can recall was because of SPV mining which didn't generate any bitcoin out of standard for anybody!

OP. you obv. have only superficial knowledge about Bitcoin. You shouldn't start such topics until you have understand at least the basics:

https://en.bitcoin.it/wiki/Main_Page
This here is interesting, not only to understand Bitcoin:
https://www.youtube.com/watch?v=ZloHVKk7DHk

Let, who ever is in doubt, ask the questions in the Newbie corner and it would be answered... If you have a theory and it's backed by facts, state it here and it would get discussed.

Let's not forget what this section is all about... discussions based on Bitcoin. It seems as though the OP of this thread, have a little bit of background on how things work, and let's give him the opportunity to

state his case... then we discuss that and get to some agreement on what is, and what is not possible.
 

From my experience, this community pick up on "strange" things very quickly... so if something like this should happen, the engineers would react very quickly and alerts would be send out.

No payment system is 100% fail safe... PayPal gets hacked... Credit cards are frauded and fiat get counterfeited... It's just the nature of things.. let's just accept that.   

I Think blockchain hacking wouldn't be happened because they has highly securities. But even through any one day earth need's to collapse don't know maybe blockchain will be ??? If it happens lot of Blockchain customers will see very huge lose.

AFAIK having 51% of the network hashrate does not guarantee control of the network.
It simply implies that one has greater chance of solving a block instead of the rest 49%.
The other 49% though still has great chances of solving the blocks themselves.

As you can see here (https://blockchain.info/block/00000000000000000aafbc6e6c20f255b680f9371fbb0004c69bc8e3ddc0a72a) 21 Inc. has only 4% of the network hashrate yet they solve blocks too ;)

Now, if an entity or group was to accumulate more than 51% of the network hashrate it would be in their best interest to actually use that power to solve most blocks and get the reward.
Remember, that they cannot control Bitcoins they don't own already, so, think about it, what would you do?

the only thing that can put a real threat to bitcoin would be a thing that will force to change its algo thus making the whole mining network useless until all machine will adopt, which isn't a thign that you can do in few hours

this can compromise bitcoin irreversibly

No, he wouldn't.

People seem to have the strangest fantasies about what someone could do with 51% network power. They can avoid transactions to be included in the blockchain (thus effectively blocking some transactions), that's about it. They can NOT change/manipulate transactions, or spend bitcoins they don't have, or create more bitcoins out of thin air, or create illegal / invalid transactions, or anything else.

Definitely.

Not a big deal. I expect it will happen less in a year.

What  ???

If a theoretical weakness in SHA256 or ECDSA is ever discovered, it's initially no more than a glitch in the distant future, and it'll still be years or even decades before it can actually be put to practical (ab)use. Gives us all plenty of time to switch to a different hashing and signing algorithm (like SHA3 hashes and M-383 or E-521 curves). We can adjust the Bitcoin protocol and software to use a new hashing or signing algorithm starting at some block number in the future.

No problem whatsoever.

It's impossible to hack the blockchain NOW, imagine in the future when intel and the rest get on the mining game. To make any substantial change for the past 10 minutes you would need tons of power, its nonsense.

Imagine the future when half of current asics will be switched off  ;D

this if we assume that such thing will be made public, but what if they will work on something to break sha256 secretely, as they knew of the bug about the ssl bug many years before it happened

you need plenty of time to change all those asic machine to a new algo and since i'm talking about a distant future where the network will be even more bigger(much more) than today, it would be surely a big waste of money to change all the machien with new one

I think that everything is possible in this world but that the community of bitcoin will be able to not leave that this thing happen. there are to much time that it is spoken about the famous 51% but until now nothing was happen. I don't see the reason why this will happen in the future.

Nah I don't think that the block chain is hackable.
And also that the 51% attack cannot take place.
I know there was an incidence when a pool reached about 47% of network  hashing power, but still I don't think that it can happen.

Nostradamus will be amazed by your ability to predict such important things. I think that the negativity and the alarmism don't help no one and don't serve for anything. I think that this event has to many few probability to happen and the bitcoin community must do their normal life without worrying about this catastrophe.

H_H

your walls of text and newbie accounts are hilarious

i respect u as a person like i do everyone

but can u tell ur boss at Goldman i say hello :)

It's hard to believe your a expert when you say miners are the nodes. If you have your own wallet, then more then likely your running a node. It's hard to believe anything you say, when you don't even know the basics and yet call yourself a expert. I can only believe you joking around.

I doubt anyone else ranked in the top .2% of SM for #bitcoin is posting here, this forum is notorious for kook aide drinkers on btc

Yet I am an 'expert' on the topic

I have several wallets, i prefer electrum

I don't waste my efforts 'mining'

I've acquired btc for years by integrating it into many sites we run

so I'm PRO btc as an alternative payment method, some use it

it's good for vice, porn and gambling and to some degree tech services and even minor digital sales like downloads of scripts or ebooks

the whole btc network revolves around 2 things basically

1. public ledger
2. lots of nodes mining and handling the trans that go into the public ledger

stress test showed the network has a problem with volume minor transactions

that's what it proved and kook aide drinkers ignore it

will btc disappear? not in the 'near future' but it will be replaced and the replacement IMO will be a centralized public ledger controlled by a dozen or so trusted nodes using AI level super computers and crypto that isn't even developed yet

so yes, I'm an 'expert' but experts differ on opinions

if you look at all the 'buzz' in SM about btc, I don't say much on it, yet my expert ranking is due to who follows me, who retweets the few things I say on the topic and who favs me

so lots of noise in SM about btc, and a 6 post newb saying I'm not expert and mining isn't a voice of authority

18 months of very negative value growth is all you need to know about btc

now we have the stress test issue

is there a better crypto right now? no

will there be a better crypto using some of the btc ideals? I think so

opinions are like, well you know the saying

my opinion just happens to be attached to a .2% EXPERT KLOUT ranking on bitcoin

You are mistaken.

Having 51% of the network hashrate guarantees that at some point
sooner rather than later, you will be able to establish a mining monopoly
by building the longest chain and locking out all other miners.

If they win a block, you simply build a chain on top of your block
from 1 block ago.  Longest chain wins.

Also please ignore H_H.  He is mostly likely "Sol Adoni" and if
he is not, he is a very similar trolling fool.

prove it ... if you talk about the split of the blockchain, it's not an hack, it's a feature (automated correct by BIP66 enforced).

during the "stress test", i have meit regulary bitcoin transaction without any issue ... BECAUSE i use the bitcoin core 0.11 and automated fees calculation.

so, in the stress test, fees has been at 0,0001 BTC
in "no" stress test situation, the normal fees are 0,00001 BTC for this 2015 year.

it's not possible.

don't place the exchange at the same point of the Bitcoin network, please ...

there's several definitions of a 'hack'

DdoS is a hack, it overwhelms a network and disrupts normal flow of traffic on the network

the stress test was equal to many as a form of DdoS attack

normal patterns of the btc network were interrupted and while the ST (stress test) was not a huge test of the network capacity to become a global ecommerce network on the leve of mc/visa, the ST was big enough to show btc has issues handling major transaction volumes, not in volume of worth, but in volume of transactions

you admit your had to change your trans fees during the ST, that's a disruption or 'hack' of a networks normal activity

now the 'buzz' all over the net during the ST was that many had huge waits for confirmations so that showed a major problem with the existing node model

did it get any info from the block chain or make changes? no

but like a DdoS attack it stopped normal network flow and exposed a volume related issue with nodes controlling the public ledger when brute force levels of transactions are entered into the daily flow of transactions

in normal daily use, many hate the slow speed of the nodes to do routine confirmations

during the ST the normally SLOW transactions became like quicksand, most people complained confirmations came to a literal stand still for them

our own network couldn't process any customers trying to get their tokens to pay for services during the ST

so while we don't run mining servers, we do interface with the usual btc protocols to generate tokens for purchases of our services and products and btc was down for the count during the ST and paypal and credit card gateways had no problems handling new orders

I don't think btc is going away soon, but I sure don't hold it now as an asset, it's just a payment gateway for us now, like mc/visa and paypal

but the transactions are way too slow normally and when the ST happened it made btc token generations impossible on our network

the ST was in my opinion a major hack of the btc network, some hacks disrupt networks some take or change data

the ST hack just made the whole btc network go into super slow motion and in business you can't have that

just like how many times have minor DdoS attacks taken this site down?

lots, just read their twitter tweets about all the DdoS hacks they suffer

the ST was a very simple form a DdoS attack and while btc survived it, it did expose a major weakness in the EXPERT opinion of many

kool aide drinkers for btc can't analyze anything about btc objectively, like I said, we take btc and paypal and mc/visa direct

the ST was a hack, that's MY OPINION and yep, unlike most here, in big SM I'm a top .2% expert on #bitcoin

did I jump up and down during the ST and bash btc? no

we did a minor story on it saying it exposed what was already known to many, huge volume will be an issue in the future with btc if it goes mainstream, which it now should never do

who wants to wait 6+ hours to move wealth around or even do minor transations?

1 hour is too long

the ST showed how slow the nodes will be if btc moves from being a hobby sort of quasi-currency into a bigger  percentage of ecommerce

btc had it's 15 mins of fame and huge value growth 2 years ago, the last 18 months shows the value now and it's a nice value, but it is still eratic and there's no reason to think it will move to levels it hit over 2 years ago, it's in a slow death spiral, a great footnote in history, but it will never be a major global currency unit, it doesn't have the ability to handle mega millions of transactions each day as major CC do

now, let's suppose a hacker finds a way to know the private keys from the public keys! At the moment this is considered impossible, but.... you never know.

This would implode all the cryptocurrencies down.

Well in 6 years it still hasn't been hacked and there is a pretty nice reward for doing it so I highly doubt it. Even if something would go wrong, there is always a way to fix it.

So don't worry and relax! :)

First post for me. I have invested modestly in bitcoin and I want it to succeed. I am well read but I am no expert - and a total ignoramus  with IT technical stuff.

I have read that if a large, rich state wanted to, they could 'hack'/break the system, presently and especially in the past . They have the '800m USD' of equipment (or whatever the figure was at that point in time) to do it without massive additional investment. So for ideological purposes and by a major power there may be a threat, but each day makes 'hacking' more difficult technically and more controversial/dangerous for that state. With govt sponsors like Goldman Sachs getting invested in BTC (albeit modestly), a hack gets less likely.

A real cynic may say "they" are interested in the technology and are using bitcoin as a live, wild field test to get people used to electronic currency - then later destroy BTC and replace with a centralised government backed/controlled copy. One thing you can be sure of is that governments would LOVE an electronic only currency only they control. But thats a concern for way further down the road and BTC doesn't threaten the dollar yet - it will be a lot more difficult to break the system by the time it does (if).  

Hacking for profit by criminals is less of a concern I think, not only because of the investment in equipment needed (I believe currently about USD 800m - 20% of bitcoins 'market cap'), but also because if you fuck the system, you are basically tainting your own loot. To plunder in a subtle way would make the investment inefficient and to do so wholeheartedly would fuck the system and probably render the bitcoins useless or a lot less useful.

One commenter mentioned the transaction limits as the major drawback rather than security, and this matches my research. I understand there to be practical ways to fix this if the price of bitcoins gets higher, making the 'mining' more profitable. Obviously with more adoptions/transactions, the price has to rise wight he finite supply. However this is something I'm going to be reading about on here, as I don't really know how solid these 'fixes' are or if my thinking is straight.

Peace and prosperity!  

we could easily advanced to a space living species by then... if we get these baboons out of power that are currently in power we'll get there.

https://www.youtube.com/watch?v=Kjtgp5h-jEY

How a millionaire can implode bitcoin network.

Not yet been hacked since many years.
But still can be hacked by bitcointalk hackers.

as he says in the video, the attack can be happening at this time (and 'he' only needs ~33% of the entire network - 133PH/s at today's rate - if he preforms selfish mining; and not the 51% that everybody thinks.) and nobody knows until the attacker reveals it.

https://www.youtube.com/watch?v=bi2thGzzNSs


I noticed now - tell me if i am wrong - he made the wrong calculations in this video...

1PH is 1.000.000 times bigger than 1GH, right?

1GH = 1.000.000.000
1PH = 1.000.000.000.000.000


In the video he calculates 1PH as 1000GH.

TH in between, so you are correct. The guy would need 1000 more hash than he calculates. Nice find.

Well if you count any sort of "attack" on bitcoin a hack then sure it will.. but that's stupid.

AES encryption can easily be changed if broken.

SHA-256 not so much this is true as the mining is now ASIC but.. I don't think you really understand SHA-256 however.

Even 7 trillion penta hash is nothing compared to 1.16 x 10^77..

NOTHING.  Most people get it has 77 "zeros" but they really can't fathom how bit that number actually is. Do some math on it... Perhaps when we are computing with something other than matter it will be at risk.

A 51% attack.. really... cute.

And even then, we would have upped the blockchain and wallets with the new 'no-matter' computing algorythms. It is not a static thing. We might be able by then to recollect the bitcoin that are now lost in lost wallets, you could go on a treasure hunt and find satoshi in old abandoned wallets, the future sounds neat :)

I read that there has never been an attack on the block chain that resulted in stolen money. Nothing has there ever been a reported theft resulting directly from a vulnerability in the original Bitcoin client, or a vulnerability in the protocol. For now bitcoin are considered unlikely to be breakable in the near future. But... science has been wrong many times before and there may be some things we don't know yet.

I have seen a million times these claims that bitcoin will be hacked or destroyed by evil banks and big governments. But you know what I have never seen? A realistic way that it could happen.

Put up or shut up, words are wind. Show me the science or pull it off, until then this is just moronic posturing.

Nah, BTC would be dead if you could get a private key from a public.   The hashing would have to change.. as we are using ASIC's this could be a problem.. however this is something I don't forsee being a problem for thousands of years.. legit. I don't even think quantum ASIC's would stand a chance we'd just be at crazy hashing power.

a better attack would be to directly damage all the miners, by destroying them, with weapons, that's whould seriously damage the network and the mining business in general...

What about Gavin Anderson, or anyone with access to the bitcoin live code? Could he (in theory) introduce risks to the security of the bitcoin protocol?

Why would anyone run that version? All of the nodes would have to download it and run it.

If you can solve what input produces 00000000000000000000008f9703af1d47f7d8557ba04d3ab86d6e6ccaa67be5   , you'd get 25 bitcoins.  Then you could do 00000000000000000000001f9703af1d47f7d8557ba04d3ab86d6e6ccaa67be5     for another 25.

You think people are not trying this.. thousands of them?

Doesn't Gavin & The Bitcoin Foundation introduce changes to the bitcoin protocol?

well is a thing they shouldnt had thinked yet as they need to take and assume control of 51% soo those means how many big farms hash power?,when mine bitcoin process ends i dont know it there will be possible to attack blockhain,there is a big wall to any of those expert and i really hope they dont come into bitcoin direction...better be in bitcoins those hackers then be against it,but i guess they wont bitcoin born digital ,on the code soo who else love more it them hacker and developers? ;D

But he is talking about hackers that are not affiliated with the government or any other institution. Im sure if a hacker is that good he wouldn't be wasting his time hacking the blockchain, i mean there must be plenty of other things to hack that would give him way more profit than that, surely. If the blockchain was hacked people would notice, eventually, right? So he would essentially just destroy bitcoin and he would not get as much profit, right?

Hey who knows. Maybe we'll have a technological breakthrough that will create some super quantum or sub space computers that will generate 3^^^^3 hash per second and crack all the private keys in a nano second flat.

It's not like you can disprove that its not possible (was it?)

I lost track :P

I guess it's impossible also for what comes to the 51% attack you are speaking about , dosen't Mining companies or farms have to sign a contract so they don't use the attack or something ?
I hope nothing happens for the next five years , at least I can sell my BTC after the collapse  ::)

You look a bit stupid now... you can just land on the dark side of the sun, the nightly side.

<sarcasm>
Absolutely.

Before being allowed to mine on the private bitcoin network, every miner is required by the International Bitcoin Corporation to sign a Non-Disclosure Agreement, a Non-Compete Agreement, and a Proper Use Agreement.
</sarcasm>

Bill Gate, Brian Krzanich and Larry Page has got a bit to much to drink and start braging about whos the nerdiest geek of them all. They agree to a little hacking competition and come up with the idea of hacking bitcoin.

It could happen... ;)

Yeah, and It can be orchestrated by some government.
Why it is necessary to be ONE HACKER. There can be organized attack by a large group of hackers. Then it will be easier to hack if they can somehow coordinate their attack.
Just like a country can be occupied. Wars aren't fought on one front. 
;D

It could theoretically happen but after that, Bitcoin would arise again in some other form,
even stronger than before... The attackers would have spent a lot of money only to
make Bitcoin stronger and draw a lot of attention to it.

Even right now , Gavin had some proposal to neutralize a 51% attack.
I don't know if it holds water, but there's some ideas about it.

Remember, a 51% attacker cannot get your private keys.  The worst
thing they can do is stop transactions from happening by mining
all empty blocks, but that's what Gavin's idea is trying to prevent.

Yes, one day it will be hacked... are you serious? I seriously hope a 51% attack on the bitcoin blockchain never happens...
You'll probably be hacked before that!

They purpose them.. They can't force BTC in any direction.

I agree.  You could probably spoof the hash until you built up trust. 

I think blockchain is often hacked

the evidence is very much going on retrospective case series theft bitcoin in blockchain

.. WHAT?

those are ACCOUNT / EXCHANGES getting hacked. not the blockchain itself. the difference is massive .

its better to hacked avoid bitcoin for our benefict,and im sure some hackers owns bitcoins thats why others wont try it and havent try it yet soo lets say a famous hacker is inside bitcoin comunity will support him instead connect agains him,atleast i hope this wont happen even with 51% of control of the blockhain

Wot?