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The Bitcoin Strikes Back

smitty777 writes "Slashdot readers are no doubt informed of the infamous crash of Bitcoin. In fact, its demise was followed closely here. Wired has a recent article tracking Bitcoin's climb out of chaos. Valued at $17 before the crash, it had lost 90% of its value due to the hacking incident, down to a low of $2. It climbed back up to $3 in December, and is currently valued at $4. From the article: 'Bitcoin boosters have traditionally suggested that Bitcoin is an alternative to [the world's] currencies. But we'll suggest an alternative explanation: that Bitcoin is not so much an alternative currency as a "metacurrency" that allows low-cost and regulation-free transfer of wealth between nations. In other words, Bitcoin's major competitors aren't national currencies, but wire-transfer services like Western Union.' Still, Bitcoin has significant obstacles to overcome, such as covert mining, criminal uses, and other security issues." Amir Taaki of the Bitcoin Consultancy (who did an interview here a while back) disputes the reasoning and the conclusions in the Wired article.

36 of 344 comments (clear)

  1. Criminal uses? by Anonymous Coward · · Score: 5, Informative

    Regular money has criminal uses. The security concerns are also a non-issue as regular wallets and bank accounts are routinely stolen and money diverted.

    1. Re:Criminal uses? by Anonymous Coward · · Score: 4, Informative

      But they're not completely untraceable.

      http://reason.com/blog/2011/06/01/buy-illegal-drugs-anonymously

      Yes, you're probably safer than using a credit card, but it's never going to be as safe as paying in cold hard cash.

    2. Re:Criminal uses? by larry+bagina · · Score: 5, Funny

      Personally, I buy my coke with bitcoins, use a credit card to cut it into lines, then a rolled up $20 to snort it.

      --
      Do you even lift?

      These aren't the 'roids you're looking for.

    3. Re:Criminal uses? by Anonymous Coward · · Score: 5, Funny

      "It's only untraceable if I only brought ATI video cards, web hosting, and marijuana for the rest of my life."

      i fail to see the problem

    4. Re:Criminal uses? by lkcl · · Score: 3, Informative

      Regular wallets can not be stolen with a computer program. Stealing money from a bank account is possible for a program, but there are ways to recover it after the fact, unlike with bitcoin.

      err, no. the banks are willing to *refund* the "electronic" money that is stolen, by replacing it with another lot of "electronic" money. and neither the police nor the bank of england (or whatever) will print you another bank note with the same serial number, will they?

      so all that's required to "emulate" the present situation is for someone to set up an online bitcoin bank, and to offer the same "insurance" against theft as regular banks. of course, that means that they will need to charge for the service, and will need to be happy with the massive fluctuation in the currency. actually what would happen is that that bank would bitch like hell that it was your fault and that you didn't have the right anti-virus updates, and would delay the insurance claim just like any other bank.

    5. Re:Criminal uses? by Anonymous Coward · · Score: 5, Informative

      Many child porn sites and contraband trading sites on darknets take payment in bitcoin.

      OMG! OMG! Think of the children!

      There is no such thing as 'child porn sites' that take any payment. One must be a child molester and deliver 'original content' in order to be accepted in trading rings. This is well documented by the police and explain the difficulty for them to infiltrate the child pornography networks. eg: They will not rape a child to be accepted and gather evidence.

      You are full of shit. Thank you for contributing to the set back of, freedom enabling, anonymous money usage by spreading disgusting FUD.

    6. Re:Criminal uses? by Anonymous Coward · · Score: 3, Insightful

      You actually have this backwards. Every Bitcoin transaction is necessarily public information permanently. It's impossible to make a hidden transaction in Bitcoin. The issue with Bitcoin is that it's pseudonymous, so you can't, without out-of-band information, which physical person lines up with which Bitcoin identities.

    7. Re:Criminal uses? by demonlapin · · Score: 4, Insightful

      As opposed to just giving him your home address?

    8. Re:Criminal uses? by um...+Lucas · · Score: 4, Informative

      False. Why don't you read their reasoning itself rather than make up ideas?

      (this from someone - me - thinks the whole bitcoin system is a worthless construct)

      https://www.eff.org/deeplinks/2011/06/eff-and-bitcoin

    9. Re:Criminal uses? by Dwonis · · Score: 4, Interesting

      True but bitcoins are completely untraceable

      Ok, so here's how Bitcoin works:

      • Step 1. Distribute the entire transaction history to everyone in the P2P network, much like how a git repository works.
      • Step 2. Have a bunch of people do lots of expensive hashing so that anyone in the P2P network can tell which "branch" of the repository is the official one. ("The branch that was the most difficult to compute" is the one that wins.)
      • Step 3. To see how much money you have, look at the transaction history for the accounts that you control.

      Bitcoins aren't really a thing you can have. Even the physical "bitcoins" you can buy aren't really coins. They're just private keys that are allowed to sign transactions on behalf of accounts that have a non-zero balance.

      The only reason why people talk about Bitcoin as being untraceable is that anyone can create accounts, and there aren't necessarily names attached to accounts, but it would be too hard for authorities with warrants to catch you if they suspected you. The entire transaction history is still there, forever, for everyone to see!

    10. Re:Criminal uses? by SomePgmr · · Score: 3, Interesting

      This I'm curious about. USD don't change in value much. What happens when you accept $60 worth of bitcoins today for goods and services, and tomorrow that currency is worth $2.50?

    11. Re:Criminal uses? by cold+fjord · · Score: 3, Informative

      There is no such thing as 'child porn sites' that take any payment.

      Really?

      Feds: 100 Arrested in Child Porn Bust

      One hundred people have been arrested as part of an undercover sting investigation into the largest known commercial child pornography business ever uncovered, U.S. government officials said today.

      The two-year investigation began with Landslide Productions Inc., a Fort Worth, Texas, company owned by Thomas and Janice Reedy. Authorities said the company was at the center of an international child pornography business that distributed lewd pictures of children having sex to subscribers over the Internet. . . . .

      Landslide grossed as much as $1.4 million in one month alone, the profits coming from monthly fees viewers paid to access child pornography Web sites, authorities said. Called Operation Avalanche, the undercover operation was based on intelligence developed from the Landslide investigation and encompassed 30 federally funded task forces formed to combat Internet crimes against children.

      "During an Operation Avalanche search, we found a collection of videotapes produced by a suspect depicting the sexual abuse of several young girls. One of the girls was only 4 years old," said Chief Postal Inspector Kenneth C. Weaver.

      The Reedys were convicted last year on charges that included sexual exploitation of minors and distribution of child pornography. A federal judge on Monday sentenced Thomas Reedy, 37, to life in prison and his 32-year-old wife, Janice, to 14 years in prison. . . . .

      OMG! OMG! Think of the children

      Maybe it's better if you, specifically, didn't. I'm not sure the outcome would be good for anybody.

      Pedophiles should be seeking help instead of seeking children or pictures of children.

      --
      much of left-wing thought is a kind of playing with fire by people who don't even know that fire is hot - George Orwell
    12. Re:Criminal uses? by gox · · Score: 3, Insightful

      Back in my home country, a good 20 years ago, when we got payed in our own currency, we switched most of it to gold, USD and DM, almost daily. I live in Europe now, but have much more money so EUR volatility too becomes important and I still need to diversify, though not constantly. Maybe it's because I'm a maths guy, but I don't see the difference in volatility coefficient as a fundamental problem. Your local currency may lose value too, but usually more slowly.

      If you are a merchant that wants to accept Bitcoin and don't want to be affected by volatility, you can use an intermediary system that converts Bitcoin to USD on the fly, at the time of sale. That's does with the problem once and for all.

      Or otherwise, if you also want to accumulate Bitcoin, you could sell a percentage of your Bitcoin earnings daily (this kind of automation is pretty easy with Bitcoin obviously, and I suspect there are services that do this already). Say, your expected profit is 10%, so you only keep 10% of your earnings as Bitcoin.

      Although, eventually the volatility will settle. It's not a specific problem about Bitcoin; any 'free' currency does have to overcome this obstacle.

    13. Re:Criminal uses? by makomk · · Score: 4, Informative

      That's what the police originally - and sensationally - claimed. Of course, it turns out that not only was the vast majority of Landslide Productions' business in legal pornography, but even then a lot of the payments to them were fraudulent and carried out by scammers who were funneling money from stolen credit card details through fake porn sites that used Landslide Productions as their payment provider. The police then went and withheld the evidence of credit card fraud to make their cases stronger...

    14. Re:Criminal uses? by BenEnglishAtHome · · Score: 4, Informative

      Intro note for the folks who will ask "How do you know this stuff?" - I did some "e-commerce investigative lead development" for the Internal Revenue Service before I recently retired. As a result, I know a lot more about the way porn is sold online than I need or want to. Most porn companies just want to pay their taxes, minimized as far as their accountants can manage, and be left alone. On this particular sub-topic I can provide some insight.

      Landslide was active from, per your link, 1997 to 1999. That was back when pictures of naked kids that were perfectly legal in some countries were considered porn in other countries. From a U.S. legal perspective, Landslide helped those markets equalize and that is, to be sure, facilitating the sale of child porn. The view from the producing countries was that U.S. puritanism was killing a small industry that was providing cash that fed, clothed, sheltered, and educated people who were badly in need of help. They couldn't understand why we criminalize pictures of what they could see just by going to the beach on a warm summer day.

      The amount of actual, nobody-could-possibly-argue-to-the-contrary child porn showing adults raping little kids that was sold with the assistance of Landslide was insignificant to nonexistent. Some of their customers possessed bad materials and you'll note that in your link the phrasing of the police spokesman ("During an Operation Avalanche search, we found a collection of videotapes...") makes it clear that the unambiguously bad stuff they found wasn't sold via Landslide but was merely found in the possession of Landslide customers. The Landslide bust, more than anything else, gave the police probable cause to execute search warrants on the customers. Making up the lists of customers, getting the warrants, and executing them was a separate action from the Landslide bust; it was called Operation Avalanche. There's nothing in the linked article to indicate that the real CP uncovered during Avalanche was actually sold by Landslide but it's pretty clear from the way the article is written that either the author or the LEO sources from which the info was obtained would like the reader to confuse these two and not realize that they were separate operations.

      There's dubious LEO-spawned "look how we're making the world a better place" PR-spew designed to demonize a couple of folks who ran a credit card processing service. There's also facts. Please stop confusing the two.

      tl;dr - GP was basically right. There are always (literally, in the entire world, counting the WWW, .onion sites, and Freenet) one or two "child porn sites" that take payment but they never survive long. They're a statistical blip. It is essentially correct (and, often, perfectly correct) to say that such sites do not exist, deliberately misleading LEO press releases notwithstanding.

  2. Propaganda by Anonymous Coward · · Score: 5, Insightful

    The speculators push the price up, pay for press releases and stories, put up blogs talking about how awesome Bitcoin is... then they get out as soon as it starts selling for enough. They've done it once, judging from this article they're doing it again, are people going to fall for it again?

    1. Re:Propaganda by Goaway · · Score: 3, Informative

      Miners dont make the network;

      Actually, it is the miners that literally make the network.

  3. Building a case... by benjamindees · · Score: 4, Interesting

    Pay attention to what is going on here, because you will start to see it in other areas as well.

    The establishment (through the media) is attempting to build a consensus that Bitcoin is not a legitimate currency, but a "money transfer service". "Money transfer" is a service that carries with it the implication of guarantee against loss of value during that transfer. It is a regulated industry.

    By branding Bitcoin a "money transfer service" in the eyes of the public, powerful banking interests will then be able to begin loading Bitcoin down with regulations. Large Bitcoin institutions may even go along willingly. Regulations create monopolies, and monopolies bring higher rents.

    This is the classical method in which the free market is subverted by government regulation, and creeping nanny-statism benefits large, risky centralized corporate interests at the expense of main street. It is the prisoner's dilemma in action. So pay attention as it plays out.

    --
    "I assumed blithely that there were no elves out there in the darkness"
    1. Re:Building a case... by GameboyRMH · · Score: 4, Interesting

      Wow you've confused yourself by going into too many layers of libertarian paranoia. How the hell could Bitcoin be regulated or policed? Places operating on the web would just move to darknets and that would be the end of that.

      --
      "When information is power, privacy is freedom" - Jah-Wren Ryel
    2. Re:Building a case... by PopeRatzo · · Score: 3, Interesting

      creeping nanny-statism

      The only "nanny-statism" we have is the government treating the corporations like badly spoiled children, giving them the biggest portions and the best bits. Catering to their needs and desires. Letting them make the rules (yes, including the regulations).

      For the rest of us, there's actually less "nanny-statism" than there was twenty-five years ago.

      On a related note, did you know there are fewer government workers today than there were during the Reagan Administration in the 1980s, despite the fact that there are about 100 million more Americans today?

      --
      You are welcome on my lawn.
    3. Re:Building a case... by artor3 · · Score: 4, Funny

      And that's just step one! Next they'll use their bitcoin monopoly to buy fluoride to put in the water supply, corrupting our precious bodily fluids!

    4. Re:Building a case... by Omnifarious · · Score: 3, Insightful

      One could make the same argument for the Internet. But now we have SOPA, which has a real chance of passing. It is true that SOPA will not actually stop piracy, and likely not even make a significant dent in it. But for the average person, the Internet will become a significantly more regulated and diverse place. Censorship masquerading as copyright enforcement.

      There used to be (and mostly still is) a regime had censorship masquerading as media consolidation with the resultant centralized control over distribution. Sure, you can say anything you want, but your ability to reach an audience is gated by people who have a vested interest in making sure certain ideas aren't heard.

      Regulation doesn't have to be absolute in order to succeed as a tool of social and economic control. It just has to be successful enough to make not following it seem like something only unsavory people do.

      I don't necessarily agree with the grandparent. But I don't think his or her paranoia is unwarranted.

    5. Re:Building a case... by petermgreen · · Score: 3, Insightful

      If the US governement wanted to they could put a lot of pain on bitcoin. For example they could go after the financial transactions with offshore bitcoin exchanges (just as they now go after financial transactions offshore online poker sites). They could announce that anyone caught running an unlicensed bitcoin exchange was open to prosecution and that authorised exchanges were only to accept coins whose history could be traced back to either an authorised miner or to before the introduction of the rules. They could further introduce laws stating that authorised miners and exchanges were required to keep transaction records including bitcoin addresses, that using or operating a "mixing service" was a felony and so on..

      Personally I think the reason they haven't done any of this yet is that bitcoin is too small for them to care. Afaict there are currently just under 8 million bitcoins in existence (and some unknown proportion of those bitcoins have been rendered irretrievable as the associated keys are lost) at $30 per bitcoin that gives a theoretical "market cap" of arround $240 million. The actual amount of money involved is probablly a hell of a lot smaller than the aforementioned theoretical market cap.

      --
      note: i'm known as plugwash most places but i screwd up registering that here somehow in the past and now can't register
  4. That's how money works by Rix · · Score: 4, Insightful

    It has value because we pretend it does.

    So stop pretending about the US $, then.

    1. Re:That's how money works by Richard_at_work · · Score: 3, Insightful

      The value of the US $ is in the fact that it's accepted at millions of places, not just in the US but around the world. Yes, it might only have a set value because we allow it to, but the real difference between it and BitCoin is the number of people willing to allow that set value. Personally i wouldnt accept any payment in BitCoin today, because i have no reasonable use for it as-is, and the exchange rate to another currency is nowhere near stable enough to be sure my balance doesnt become worthless overnight.

      BitCoin doesn't have the momentum to be a viable fiat currency yet - look at the problems the Euro is currently suffering, and that's bing pushed by governments and huge financial institutions, did anyone really think BitCoin had a better chance?

    2. Re:That's how money works by EdIII · · Score: 3, Interesting

      The Remnibi, however, is exactly how you described, except that the military backing it up is a hell of a lot larger than the US's, and they've got the US' economy by the balls.

      The Chinese military is not larger than the US military in 1:1 terms overall. Ground forces? Well yeah. Duh. How do they get their military anywhere? They never have. Their only aircraft carrier is an ancient retrofitted throwaway from Russia that is being used for training and experience.

      The US military on the other hand, has been in Korea, Japan, all over the Pacific, Panama, France, Germany, Vietnam, Italy, etc. just in the last 100 years. Probably more places, but you get my point.

      It's a rather pointless comparison. The US has much smaller ground forces but an incredibly larger ability to move those forces anywhere in the world. China cannot, and has not, moved its military anywhere farther than its own continent. The US could never even begin to hope to obtain a beachhead on Chinese soil, much less sustain actual ground conflict.

      It's a stalemate. China could never move and protect ground forces to US soil without air and sea support at least as large as the US. The US does not have enough resources in both ground forces and sea/air support to do the same.

      Nobody has anybody by the balls. It's just a bunch of bullshit the 1% likes to have us argue about because it distracts us from the larger problem. I'll let you figure out what that actually is.

      Hint: Somebody has somebody else by the balls, but neither side is a country.

  5. C'mon, Slashdot admins by 93+Escort+Wagon · · Score: 4, Insightful

    Please, PLEASE add "BitCoin" to the "Exclude stories by topic" /. site option.

    --
    #DeleteChrome
  6. Re:That's how money works - a shared hallucination by PureFiction · · Score: 4, Interesting

    "It has value because we pretend it does."

    absolutely true!

    fiat currencies are just as much a shared hallucination as bitcoin.

        at least bitcoins may provide more privacy...

  7. Stability by Xugumad · · Score: 4, Insightful

    Yes, because relative value of a Bitcoin vs USD is really what's holding the currency back, and not, in fact, the massive price instability.

    Realistically, people don't want to use a currency that gains 1000% in value, then drops again, then up 200% in only a few months. Until you can pay your taxes in Bitcoin, you're going to have to convert money out of Bitcoin ASAP after getting it, to ensure you can actually meet future obligations, and that makes it a right pain to deal with.

  8. Why the quoted price of Bitcoin doesn’t matt by Beautyon · · Score: 4, Insightful

    Bitcoin is a very new technology, even though the concept that it brings to life is decades old. The double spending problem has been solved; this means that it is possible to use a digital certificate to stand in the place of money and be sure that no one else can spend that certificate other than you as long as you hold it. This is an unprecedented paradigm shift, the implications of which are not yet fully understood, and for which the tools do not yet exit to fully take advantage of this new idea.

    This new technology requires some new thinking when it comes to developing businesses that are built upon it. In the same way that the pioneer providers of email did not correctly understand the service they were selling for many years, new and correct thinking about Bitcoin is needed, and will emerge, so that it reaches its full potential and becomes ubiquitous.

    Hotmail used familiar technologies (the browser, email) to create a better way of accessing and delivering email; the idea of using an email client like Outlook Express has been superseded by web interfaces and email ‘in the cloud’ that provides many advantages over a dedicated client with your mail in your own local storage.

    Bitcoin, which will transform the way you transfer money, needs to be understood on its own terms, and not as an online form of money. Thinking about Bitcoin as money is as absurd as thinking about email as another form of sending letters by post; one not only replaces the other but it profoundly changes the way people send and consume messages. It is not a simple substitution or one dimensional improvement of an existing idea or service.

    As I have explained previously, Bitcoin is not money. Bitcoin is a protocol. If you treat it in this way, with the correct assumptions, you can start the process of putting Bitcoin in a proper context, allowing you to make rational suggestions about the sort of services that might be profitable based on it.

    If Bitcoin is a protocol and not money, then setting up currency exchanges that mimic real world money, stock and commodity exchanges to trade in it doesn’t make any sense. You would not set up an email exchange to buy and sell email, and the same thing applies to Bitcoin.

    Staying with this train of thought, when you type in an email on your Gmail account, you are inputting your ‘letter’. You press send, it goes through your ISP, over the internets, into the ISP of your recipient and then it is outputted on your recipient’s machine. The same is true of Bitcoin; you input money on one end through a service and then send the Bitcoin to your recipient, without an intermediary to handle the transfer. Once Bitcoin does its job of moving your value across the globe to its recipient it needs to be ‘read out’, i.e. turned back into money, in the same way that your letter is displayed to its recipient in an email.

    In the email scenario, once the transfer happens and the email you have received conveys its information to you, it has no use other than to be a record of the information that was sent (accounting), and you archive that information. Bitcoin does this accounting in the block chain for you, and a good service built on it will store extended transaction details for you locally, but what you need to have as the recipient of Bitcoin is money or goods not Bitcoin itself.

    Bitcoin’s true nature is as an instant way to transmit money anywhere in the world. It is not an investment, or money itself, and holding on to it in the hopes that it will become valuable is like holding on to an email or a PDF in the hopes it will be come valuable in the future; it doesn’t make any sense.

    Despite the fact that you cannot double spend them and each one is unique, Bitcoins have no inherent value, unlike a book or any physical object. They cannot appreciate in value. Mistaken thinking about Bitcoin has spread because it behaves like money, due to the fact it cannot be double spent. This fact however has masked Bi

    --
    ATH0 Bitcoin: 1DnwFLXczVZV8kLJbMYoheUrpqHesjxrSi
  9. "fair and balanced"? by nothings · · Score: 3, Insightful
    Why did Soulskill add a contradictory viewpoint to the story? One from an obviously biased source (a bitcoin developer)? We slam the mainstream media for this kind of bogus "balance"; do we want Slashdot to follow down that path?

    If you want to offer a contradictory viewpoint from a less-biased observer, that's fine. But if you go straight to the maximally biased source, it's suggestive that there isn't an unbiased source with that perspective in the first place. Maybe there is, but if so, use them. If not, don't bother with "balance".

  10. Obstacles? by J'raxis · · Score: 3, Insightful

    So long as governments define myriad victimless activities and mere attempts to keep their prying nose out of your private financial transaction as "crimes," I would say Bitcoin's "criminal uses" are a feature, not an obstacle.

  11. You've no idea what you're talking about by Weezul · · Score: 4, Informative

    Bitcoin is the most traceable "currency" in the world. It's just that bitcoin accounts don't have names attached, making them less tracable than bank account transfers, credit cards, etc., but certainly you can trace them, and ask the first legit possessor how they obtained them.

    There should probably be an anti-fraud protocol that attempts to trace the paths of fraudulently transferred bitcoins. You could establish "super" civil rights protections around it that complied with the tightest civil liberties rules in various countries, much like wikileaks did for journalism, but ultimately provided a sensible framework for ex-post-facto dispute resolution.

    --
    The Christian religion has been and still is the principal enemy of moral progress in the world. -- Bertrand Russell
  12. Re:That's how money works - a shared hallucination by LordLimecat · · Score: 3, Interesting

    I should have clarified that I think Bitcoin intrinsically lacks qualifications for a currency capable of buying a car.

    For instance, a break through in prime factorization (or however bitcoins are created) that is kept secret could mean that someone generates a ton of money out of thin air, which are impossible to identify apart from normal bitcoins (as they would be legitimate bitcoins). Think the counterfeiting problem, except a breakthrough here means an exponentially bigger problem.

    Further, the problem of the wildly fluctuating prices: why would I want to store money in a currency whose value can wildly fluctuate from $17 ea, to $2, to 4, all in the span of a year? Why would a bank want to give out loans in a currency when they could end up receiving far less than they loaned out? Why would I want to loan from them when my debt could skyrocket in price?

    Further, I can think of very few usecases for the anonymous features of Bitcoin. Every scenario I can think of involves activity that is internationally illegal (ie, money laundering). How would you like seeing Big Corp, Inc have $1B in bitcoins from venture funding, then "losing" $500 mil to "unforseen contingencies", and knowing there is no possibility of tracing what happened? Hmmm, doesnt sound so good now does it?

    And my understanding is that we moved away from a gold standard precisely so that we could regulate the economy to some degree by controlling the flow of money. We gave up the stability of having some real-world backing (gold) so that we could have more flexibility. Bitcoin has the worst of both worlds: its "backing" is a mathematical function, the supply is uncontrollable, and its value is unstable. Wooo, where can I sign up?

  13. Mod parent UP please! by Burz · · Score: 4, Informative

    Bitcoin transactions are very traceable and there is no indirection or anonymization built into the software. The GP doesn't know what he is talking about.

  14. Re:That's how money works - a shared hallucination by subreality · · Score: 4, Informative

    For instance, a break through in prime factorization (or however bitcoins are created) that is kept secret could mean that someone generates a ton of money out of thin air, which are impossible to identify apart from normal bitcoins (as they would be legitimate bitcoins).

    They're created through brute forcing SHA256 hashes to meet a specific criteria. As the global hashrate rises, a difficulty factor is automatically adjusted to keep generation constant at 300 per hour.

    If you invent an inexpensive piece of hardware that can push several orders of magnitude more SHA256 hashes per joule, you will successfully capture a disproportionate percentage of those 300 coins per hour. You do not get to generate unlimited coins - you just asymptotically approach 300/hour.

    In fact, this has already happened: hashing used to be done on CPUs at about 10-20 MHash/s per core; then the RadeonHD happened. Suddenly some people had access to hundreds / thousands of "cores" (they're vector processors, practically miniature Crays for $200 a pop for this problem), pushing 500-1000 MH/s per GPU. Hashrate surged by orders of magnitude as people bought 58xx and 59xx cards as fast as they could make them, and difficulty rose in lockstep. End result: CPUs are now irrelevant and Radeons are marginally profitable if you have cheap power. It wasn't a problem.

    It's also easy to switch to a new proof-of-work if someone completely breaks SHA256.

    There are some significant weaknesses in Bitcoin, but this isn't one of them.