Bitcoin double spend hacker news search

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WATCH RELATED VIDEO: Doing VERY EASY Double Spends on DASH

Hackers steal $80 mn cryptocurrencies of Qubit Finance


Nice analysis! I've often thought that HN gives unfair advantage to stories about YC companies, beyond just the normal echo-chamber effect.

Would you mind posting a link to the corresponding HN discussion, as it's burried and searching in HN is impractical at best? Fabien: the discussion on HN is here and Reddit has some discussion here.

The Reddit discussion has some interesting links. I'll doing a postmortem of my article and I would be really amazed to see the graph my article i posted yesterday made on HN What if successful startups are just lucky? Does your crawler still running? I wonder if I had some penalties and what the graph looks like. Awesome post! I'd love to see more about the voting ring detection penalty. At this point, every one of my posts that makes the front page gets penalized.

According to PG this is due to voting ring detection. I'm certainly not organizing any voting rings. I believe this may be another inadvertent type of penalty for popular domains -- having too many friends that upvote you and set off "voting ring detection".

It's a bummer because I put a lot of time in the content and truly think it is good content. The end result is that I "set it and forget it" on Hacker News. Trying to engage there just leads to frustration when the comment thread suddenly drops from the front page.

Another observation - my posts on gender which I no longer write about due to the personal risk got the "flamewar" penalty, even though they were honest, noncontroversial pieces generating some really good discussion. Apparently it was too much discussion.

The algorithm probably protects us from a lot of junk but it also hurts sometimes too. Vianney Lecroart: unfortunately I'm note running my crawler any more, so I don't have data for your article.

HN Reader: I'd like to know more about the voting ring detection too. Apparently that's what nailed my article. Like you, I'm definitely don't have any voting ring, so I don't know why I got hit by the detector. Thanks for putting this together. We had the "Get your health records from any doctor" post. This article has got point on HackerNews, quite an amazing feat.

How Hacker News ranking really works: scoring, controversy, and penalties righto. I guess, over K page views?? Very interesting! Two questions.. Not just being hellbanned. Anonymous, I think they should be, more trusted votes are counted more, If I am not wrong. Simple example, when a new account publish or vote its not reflected immediately. I must say that you have a very good article. Continue to inspire your reader and Have a good day! You can also visit my site indicated below and share it with your friends.

Post a Comment. How Hacker News ranking really works: scoring, controversy, and penalties. The basic formula for Hacker News ranking has been known for years , but questions remained. Does the published code give the real algorithm?

Are rankings purely based on votes or do invisible factors come into play? Do stories about the NSA get pushed down in the rankings? Why did that popular story suddenly disappear from the front page after you commented on it?

By carefully analyzing the top 60 HN stories for several days, I can answer those questions and more. The published formula is mostly accurate. Anything with "NSA" in the title is penalized and drops off quickly. A "controversial" story gets severely penalized after hitting 40 comments. This article describes scoring and penalties in detail. This exponent is known as gravity. You might expect that every time you visit Hacker News, the stories are scored by the above formula and sorted to determine their rankings.

But for efficiency, stories are individually reranked only occasionally. When a story is upvoted, it is reranked and moved up or down the list to its appropriate spot, leaving the other stories unchanged. Thus, the amount of reranking is significantly reduced. There is, however, the possibility that a story stops getting votes and ends up stuck in a high position.

To avoid this, every 30 seconds one of the top 50 stories is randomly selected and reranked. The consequence is that a story may be "wrongly" ranked for many minutes if it isn't getting votes.

In addition, pages can be cached for 90 seconds. Raw scores and the 1 spot on a typical day The following image shows the raw scores excluding penalties for the top 60 HN articles throughout the day of November Each line corresponds to an article, colored according to its position on the page. The red line shows the top article on HN. Note that because of penalties, the article with the top raw score often isn't the top article.

This chart shows a few interesting things. The score for an article shoots up rapidly and then slowly drops over many hours. The scoring formula accounts for much of this: an article getting a constant rate of votes will peak quickly and then gradually descend. But the observed peak is even faster - this is because articles tend to get a lot of votes in the first hour or two, and then the voting rate drops off.

Combining these two factors yields the steep curves shown. There are a few articles each day that score much above the rest, along with a lot of articles in the middle. Some articles score very well but are unlucky and get stuck behind a more popular article. Other articles hit 1 briefly, between the fall of one and the climb of another.

Looking at the difference between the article with the top raw score top of the graph and the top-ranked article red line , you can see when penalties have been applied. The article Getting website registration completely wrong hit 1 early in the morning, but was penalized for controversy and rapidly dropped down the page, letting Linux ate my RAM briefly get the 1 spot before Simpsons in CSS overtook it.

A bit later, the controversy penalty was applied to Apple Maps shortly after it reached the 1 spot, causing it to lose its 1 spot and rapidly drop down the rankings. The Snapchat article reached the top of HN but was penalized so heavily at am that it dropped off the chart entirely. Why you should never use MongoDB was hugely popular and would have spent much of the day in the 1 spot, except it was rapidly penalized and languished around 7.

However, it was quickly given an even bigger penalty, forcing it down the page. As it turns out, it would have soon lost the 1 spot to FTL even without the penalty. The green triangles and text show where "controversy" penalties were applied. The blue triangles and text show where articles were penalized into oblivion, dropping off the top Milder penalties are not shown here.

It's clear that the content of the 1 spot on HN isn't "natural", but results from the constant application of penalties to many articles. It's unclear if these penalties result from HN administrators or from flagged articles. Submissions that get automatically penalized Some submissions get automatically penalized based on the title, and others get penalized based on the domain.

It appears that any article with NSA in the title gets an automatic penalty of. I looked for other words causing automatic penalties, such as awesome , bitcoin , and bubble but they do not seem to get penalized.

I observed that many websites appear to automatically get a penalty of. I'm sure the actual list is longer. This is separate from "banned" sites, which were listed at one point. One interesting theory by eterm is that news from popular sources gets submitted in parallel by multiple people resulting in more upvotes than the article "merits".

Automatically penalizing popular websites would help counteract this effect. The impact of penalties Using the scoring formula, the impact of a penalty can be computed. If an article gets a penalty factor of. A penalty factor of. Thus, a penalty factor of. Controversy In order to prevent flamewars on Hacker News, articles with "too many" comments will get heavily penalized as "controversial".

In the published code, the contro-factor function kicks in for any post with more than 20 comments and more comments than upvotes. However, the actual formula is different - it is active for any post with more comments than upvotes and at least 40 comments. Based on empirical data, I suspect the exponent is 3, rather than 2 but haven't proven this. The controversy penalty can have a sudden and catastrophic effect on an article's ranking, causing an article to be ranked highly one minute and vanish when it hits 40 comments.



Twitter says 'took steps' to secure Modi's account after early-morning hack

Expert insights, analysis and smart data help you cut through the noise to spot trends, risks and opportunities. Sign in. Accessibility help Skip to navigation Skip to content Skip to footer. Become an FT subscriber to read: Inside the cult of crypto Leverage our market expertise Expert insights, analysis and smart data help you cut through the noise to spot trends, risks and opportunities. Join over , Finance professionals who already subscribe to the FT. Choose your subscription. Trial Try full digital access and see why over 1 million readers subscribe to the FT.

But I pay anonymously, using Bitcoin/PaysafeCard/Cash/drugs! Doesn't matter. There are roughly two usecases where you might want to use a VPN.

Smart Contract Hacking: What is it and What Does it Affect?

According to a post on the Bitcoin Gold forums, the attacks have started taking place since last Friday, May This grants the attacker the ability to modify details of blockchain transactions, an ability he's been using in the last few days to perform a second attack called "double spend," which as the name implies, allows him to spend the same amount of coins twice. Because the cost is high, the attacker can only profit if they can quickly get something of high value from a fake deposit," the Bitcoin Gold team explained. This is why they are targeting Exchanges. For the last few days, the attacker has been doing just this. He's been depositing large amounts of BTG coins at exchanges, but also sending the same funds to his own wallet. By the time exchanges realize the blockchain has been tampered with and that the transaction is invalid, the hacker has already withdrawn funds from the exchange and doubled his original funds. To counteract attacks, exchanges have been raising the threshold needed to confirm a BTG transaction in the past few days, but the hacker has continued to deploy more and more mining power to take over more than half of the Bitcoin Gold network and carry out the double-spend attack anyway. To be clear, the hacker hasn't been stealing money from users, but from the exchanges. While no user has lost money, the attacks are still dangerous because they might destabilize an exchange's backup funds, or may lead to its insolvency, which in turn may prevent users from withdrawing funds.


Top 10 Most Notorious Hackers of All Time

bitcoin double spend hacker news search

The crypto world has opened up numerous innovative investment avenues for retail investors across the globe. But with the new opportunities come potential pitfalls. Cryptocurrency wallet hacks are among them. And while the threat posed by such attacks is significant, you can protect yourself in several ways.

Nice analysis! I've often thought that HN gives unfair advantage to stories about YC companies, beyond just the normal echo-chamber effect.

Crypto.com hack exposes shortcomings of multifactor authentication

Alexandria Jacobson is a staff reporter covering internal operations at tech companies. An NFT is a non-fungible token, which is a unique unit of data that provides a secure record of ownership on a blockchain. NFTs are often associated with a digital asset — in this case, an illustration of different cats eating pizza, wearing sunglasses or holding a martini. After people watch the first episode, we can see what they responded to. The NFT holders can also vote on story elements and character names in the show.


A hacker recovered a crypto wallet worth $2 million for the owner who forgot the password: report

Undocumented, conditional, non-displayed order types. Routine wash trading. Smoke-filled dark pools. Well unless they pay no dividend, have dual-class share structure, and IPO without a profitable quarter. Ah right, you think someone will buy it for more. I truly appreciate your experience and cynicism here. People who haven't worked in financial markets have a hard time appreciating how deep the muck can get.

Searching for the best crypto broker is not an easy task. The day after she died, one of Hacker News Search: so here I am 11 years after signing the.

Bitcoin’s Double Spending Flaw Was Hush-Hush During Rollout

With the significant growth of internet usage, people increasingly share their personal information online. As a result, an enormous amount of personal information and financial transactions become vulnerable to cybercriminals. Phishing is an example of a highly effective form of cybercrime that enables criminals to deceive users and steal important data.


Poly Network cryptocurrency hack sees hundreds of millions of dollars worth of Ethereum, other coins stolen. The stolen money included hundreds of millions of dollars in cryptocurrencies Ethereum, Polygon and BSC. Poly Network, which allows users to swap cryptocurrency tokens across different blockchains, said on Tuesday it had been hacked and urged the culprits to return the stolen funds, threatening legal action. The hackers exploited a vulnerability in the digital contracts Poly Network uses to move assets, according to blockchain forensics company Chainalysis.

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If you're in the technology space, you've probably stumbled upon Hacker News at some point or another. Maybe you're interested in knowing what's popular this week for technology or maybe you have something to share. It's a platform for information.


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