Bitcoin Checker - GitHub

FUD Friday: Greg Maxwell drops the hammer on Haskell and Rust

My first OP was dedicated to debunking trivial EITN FUD, so this time I'm going in the opposite direction and asking others to debunk or support what one of Bitcoin's top math/crypto/compsci gurus says about Cardano's chosen languages.
Thanks to both u/nullc and u/ataraxiaceleste for opening and expanding the discussion.
Courtesy of BitcoinTalk: Thoughts regarding use of Rust and Haskell for building a blockchain
Gmax responds:
Performance and memory usage are both security critical in consensus systems. It's difficult (impossible?) to write Haskell which is all three performant, predictable in its memory usage, and idiomatic-- at least for some sufficiently strict requirements in performance and memory usage.
Rust is a lot like C++. In theory, it's easier to write rust code that lacks particular classes of bugs than in C++. However, no one using C++ uses the entire language and the various subsets people use also largely avoid various kinds of bugs. Not as rigorously as rust, particularly because its hard to verify you're using the subset of C++ you're intending to use.
In Bitcoin we've found that the kind of bugs that rust guarantees the absence of have been uncommon.
I've personally found that the rust code I've encountered online has often been low quality to extremely low quality-- often throwing panics on the slightest unexpected input or usage, or suffering from incorrect results due to integer wraparound (which in theory debug mode would catch, but it runs so slow as to be completely unusable on many codebases). I'm unsure if this is a property of the language itself (e.g. does the syntax lead to greater faults), user's expectations of the language (sloppy work because they expect things to be 'safe'), or the useapplication (e.g. are people that redo stuff "but in rust" less experienced programmers?).
Given that experience I would not place a bet right now that rust currently lowers the rate of serious defects in large programs developed by experienced teams compared to C++ with modern practices. However, if I had to use software written by inexperienced developers I suppose I would probably prefer they use rust to C++...
The rust ecosystem is also immature and unstable-- it's not uncommon that any random code you get requires some bleeding edge new compiler. Rust also largely imitates the extremely security-toxic software distribution model of ruby and javascript-- it's common for a rust package to have a dependency graph of hundreds of assorted packages, any of which could backdoor your system. It's possible to use rust without using the packaging ecosystem, but doing so is more of a challenge.
Rust and C++ also have no good facilities for formally reasoning about the behaviour of programs (beyond things like the borrow checker in rust). But C++ is a superset of C and there are tools to rigorously prove things the properties of C code, which means you can write components of C++ programs in C and formally prove things about them. You could do the same with rust+c but C++ and C share a lot more syntax and behaviour.
In the world of open source Rust and Haskell both have an additional limitation that the community of developers and reviewers for these languages is smaller than that of C++.
Please note that however much I tend to defer to his opinions (per Adam Back's guidance that when one disagrees with Greg about technical matters they are probably wrong), I must reconcile that deference with respect for the IOG team's galaxy brains. Negative appraisals of Rust and Haskell aren't going away, so IMO it behooves the Cardano community to get a grip on the most valid criticisms and try our best to stay ahead of them.
On a lighter note, the Monero sub has been having a lot of fun in their weekley Skepticism Sundays and we are overdue for our own version, as previously suggested months ago by u/velvia695 at .
Let's keep it educational and really do our best to limit use of ad homs to zingers and puckish banter rather than as a subsitute for actual arguments!
submitted by Jahtoshi_Rastamoto to cardano [link] [comments]


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submitted by CvvShop-DumpsShop to ApprovedCc [link] [comments]

A final response to the "Tell me why Trump is a Liar".

Trump lies about raising money for Veterans.

Trump claims 300,000 veterans died waiting for medical care with no evidence to back up the claim.

Trump dodges draft claiming “bone spurs” and lies about it today.

Trump lies about donating to charity.

Trump lies about donating to charity again claiming he has donated over $100 million dollars without providing any records or evidence or naming who he donated too. Meanwhile a TSG review of his foundation’s Internal Revenue Service returns ranks Trump as the least charitable billionaire in the United States.

Trump lies about losing lawsuits.

Numerous celebrities allege Trump cheats at golf.

Trump makes up civil war battle to make his golf club seem more important, questions historians who tell him he’s wrong, makes up fictitious anonymous historians who said he was right, backpedals even further by saying the made-up historians didn’t talk to him but his people when he is asked their names.

Trump lies about self funding his campaign.

Trump lies about campaign spending.

Trump lies and claims his book Trump: The Art of the Deal is the best selling business book of all time.

Trump campaign manager assaults reporter. Trump lies and claims the reporter made the story up until police confirm it through security footage and arrests manager.

Trump lies and claims Hillary wants to release violent criminals from jail.

Trump lies and claims he is beating Hillary in the polls.

Trump lies about support numbers.

Trump lies and claims the U.S is “losing jobs like never before.” only a few days after acknowledging job numbers showing the creation of 271,000 jobs in a month.

Trump lies and claims raising the price of life saving drugs for patients who can’t afford them will save the U.S $300 billion dollars a year for a $70 billion dollar program.

Trump lies and claims he had never heard of White Supremacist leader who endorsed him despite mentioning him by name for over 15 years.

Trump lies and claims the Mexican government is forcibly deporting convicted criminals into the United States.

Trump lies about immigrants and ignores that immigrants are less likely than native born Americans to commit violent crimes or be incarcerated.

Trump lies and claims he polled top with Hispanics despite actually only polling 7% approval.

Trump lies and claims he pulled in 15,000 at speech. Real number is proven to be 4,000.

Trump lies and claims Mexicans are pouring into the U.S despite statistics showing more Mexicans leaving the U.S than coming in every year.

Trump lies and claims Mexicans are pouring into the U.S despite the facts showing that for the last half decade the immigration numbers have flat lined.

Trump lies and claims president Obama is going to import a quarter of a million refugees when the real number is 25 times lower.

Trump lies and claims the U.S has no process for vetting refugees.

Trump lies and claims the U.S only allows Muslim refugees and refuses to let Christians in.

Trump lies and claims almost every single Syrian refugee is a strong young man when statistics show the majority of Syrian refugees are women.

Trump lies and claims “scores” of U.S migrants have been charged with terrorism when the actual number is 0

Trump lies and claims Ohio protesters had connections to ISIS despite all evidence proving the contrary.

Trump lies and claims he predicted Osama Bin Laden.

Trump lies about French Gun Laws after Paris Attack.

Trump lies and claims he lost hundreds of friends during 9/11 yet can’t give a single name.

Trump’s falsely claims he saw thousands of Muslims celebrating while the twin towers fell on 9/11 on the news and refuses to admit he lied after the claim is completely debunked.

Trump lies and claims the 9/11 hijackers' wives knew what was going to happen and were sent home before the attack despite the fact none of the 9/11 hijackers were married.

Trump cites debunked poll created by conspiracy theorist claiming 25% of Muslim Americans support violence against America.

Trump lies and claims Orlando shooter was foreign born immigrant despite being born in the same city as Trump.

Trump lies and claims the U.S nuclear arsenal doesn’t work.

Trump falsely claims ⅘ white people who were victims of homicide were murdered by blacks after rewtweeting statistics made up by Neo-Nazis.

Trump lies and falsely claims Oakland And Ferguson among the most dangerous cities in the world, when in reality they aren’t even among the most dangerous cities in their states.

Trump lies about various names and slurs he has publicly used to refer to women despite video evidence proving contrary.

Trump lies about his winery being the largest on the east coast.

Trump lies and claims June has “no jobs to be had” despite 5.4 million job openings in the U.S. that month. (A 15-year high.)

Trump lies and claims the United States is the ‘most highly taxed nation in the world.’

Trump lies and claims the U.S GDP is below 0

Trump tells New York Times he wants to impose unprecedented 45% tariff on Chinese goods. At debates he accused New York Times of misquoting him admitting how crazy it would and how he would never want it then goes on to argue for the 45% tariff two minutes later.

Trump lies and claims obama spent 4 million dollars to conceal school and passport records.

Trump lies and claims the U.S Border wall would only cost 8 billion dollars.

Trump lies and claims John Kasich "helped" Lehman Brothers ‘destroy the world economy’

Trump lies about "fishy" death of White House deputy counsel Vincent W. Foster Jr. implying Hillary was behind it and staged it to appear as if it wasn't a murder.

Trump lies and claims Putin called him a genius.

(What other Presidential candidate in history would want complements from dictators and enemies of America so bad that they would fabricate them?)

Trump lies 21 times during speech.

Trump acceptance speech fact checked by New York Times, NBC, Wall Street Journal, Chicago Tribune, NPR, ect... All agree its packed with lies upon lies.

Fact checkers go over one of Trumps town hall transcripts and find 71 separate instances within an hour in which Trump made claims that were categorically false.

Bipartisan Media Watchdog group PolitiFact finds 76% percent of all of Trump’s statements investigated in 2015 for authenticity to be false.

Bonus: Trump getting Stumped

Trump gets stumped again and again and again.

Trumps stumped by teenager on abortion question.

Trump stumped by journalists.

Trump stumped by Paul Ryan.

Trump stumped on EU question.

Trump stumped on bible question.

Trump stumped by cryptocurrency.

Trump stumped on foreign policy.

Trump stumped on question about the function of the government.

Trump stumped on economy question.

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Trump mocks people over being physically disabled.

Trump calls U.S soldiers thieves in bizarre attack.

Trump mocks POW soldier for being captured.

Trump claims POWs aren’t heroes for being captured.

Harvard professors and clinical psychologist start using Trump clips in workshops on identifying narcissists.

Trump wants Veterans kicked off fifth avenue for not being classy enough.

Trump is unable to do simple multiplication, insists he is right after getting math question wrong.

Trump thinks if teachers should be armed in classrooms.

submitted by marisam7 to EnoughTrumpSpam [link] [comments]

What is the most efficient way of checking the balance of 10k+ addresses without having a full copy local? Or can I rent out a full node?

I am currently running a pywallet --recover on the entirety of my mac hd that was used since 2013. i previously scanned stuff like the windows VM i used most of the time and a timemachine image from late 2013 and was able to check the balance by tediously grepping solely the addresses into a newline seperated file with only addr's and used the unix split function to create 8 different 1k lists.
I would then import these as watch only into electrum but even with only 1000 electrum takes a really long time to sync (and as far as i can tell theres no log file to allow me to indicate progress. my network monitor often shows no data transfer leading me to believe that electrum is quitting querying)
I would like a solution that is both stable and efficient. You could query online api's but they rate limit real fast and even utilizing multiple ones, you're bound to hit the limit fast on 80% of them pretty quickly.
Also keep in mind that every bitcoin private key has both a compressed and uncompressed address so while pywallet may say 100 keys, its 200 addresses to check.
I also would like to be able to check this every once in a while to see if any of the addresses have seen new activity. Maybe every month or so, so i'm willing to wait an hour to do it but I would like to have some notion of progress and no ambiguous malfunctions like i experienced with electrum.
What I have used so far (and some might find useful for smaller amounts)
Does anyone have any solution? Is there a way to download the current state of the entire network address balances? Don't need to be cryptographically sound like building up a db or something because i can check it via third party. Having a list of all addresses with balances would allow for a grep that I could run overnight. While it probably would take a while, at least theres always going to be progress and one can tell where they are at on their list.
Side question: is there a way to convert hex keys en masse (or wif if it takes the extra step of converting back to hex ) to litecoin? I'm going to assume that some of the keys recovered by pywallet are litecoin keys. I would then need the same process for the ltc network which I imagine would be even tougher.
If I find some cash (which I am optimistic about) I will send you 50$ for linking to a solution that fits my needs to all above. At minimum I will pay 25$ even if theres no cash on my end.
submitted by winlifeat to Bitcoin [link] [comments]

[Informational] [CC0] The Story of

Blockchain Wallet

The Blockchain wallet, also known as wallet, is a Javascript based web wallet with an extremely checkered privacy and security history that accompanies a popular Blockchain explorer on the website. The service began in August of 2011, with Android and iOS wallets wrapping the Javascript core in March of 2012 and April of 2012 respectively. Blockchain management describes their wallet as open source, however the complete software is not actually offered under an open source license, only the client source is published under an open source license and only intermittently.

Security Issues

Blockchain has been plagued with many minor and major security issues, from man-in-the-middle attack vulnerabilities to invalid key generation code. These security oversights have resulted in frequent theft of user funds.
In a 2015 security issue with Blockchain's Android wallet, it was discovered that the App was using unencrypted HTTP connections to the third party web site in order to generate the private keys for the wallet. This exposed funds in the wallet to a variety of attacks: man in the middle attacks where private keys could be stolen by network attackers, third party attacks where the operators of could have stolen funds from the wallet, and service change issues where the could stop returning dependably random numbers. The issue was discovered when funds were in fact lost, through an unexpected change in the response data from that led to private keys being guessable and therefore funds being left open to theft by third parties.
In a 2014 security issue with Blockchain's web wallet, it was discovered that random number generation was flawed due to bad code commit. White hat hacker Johoe was able to successfully obtain hundreds of Blockchain users' bitcoins by exploiting this vulnerability.
Up until the end of 2014, the web wallet had a major security issue with the way that it dealt with failures to connect to its real time data service. When the connection failed, it would retry, but the retry would not be encrypted, allowing man in the middle attacks on the private wallet data: an attacker could push invalid data to the web client causing loss of funds.

Privacy Issues

In 2012, investor in Blockchain and Bitcoin personality Roger Ver was allowed to have access to the admin panel, which he abused to publicly reveal private information about someone whom he accidentally sent Bitcoins to in order to motivate them to return the funds. Through this incident, it was also revealed that Blockchain was recording and indexing user information against Blockchain queries, in a way that helped to make compromising user privacy much easier.
The Blockchain wallet offered a service called SharedCoin to ostensibly improve the privacy of Bitcoins sent through a special sending mechanism. Sending through SharedCoin promised to match multiple users to share a transaction where funds in the transaction were split up and sent to multiple destinations, obscuring the chain of ownership. However this service's privacy protection was proved to be trivial to defeat, as outlined by Kristov Atlas in his report Weak Privacy Guarantees for SharedCoin Mixing Service
The CEO of Blockchain Peter Smith revealed in a blog post in 2016 that his company is monitoring and compiling statistics about the nature and destination of transactions made by wallet users, indicating that users should not have an expectation of financial privacy in using the service.

Rich Client Security Model

The concept behind the Blockchain wallet is one in which the web client is heavily responsible for the functionality of the wallet, as opposed to the traditional custodial model of web wallets where a server holds the user's account credit information on file and spends and holds from an aggregated set of funds.
The theoretical advantage behind this model is an improvement of security, portability and service legal exposure.
From a security perspective, custodial wallets often suffer from unauthorized movement of funds, due to the inherent complexities of securing large amounts of funds that also must be available to move quickly at a clients' request. Through fire-walling each wallet's funds off from each other by storing the funds in encrypted files, it is theorized that security breaches should be more limited in scope. Unfortunately, for ease of use reasons, the wallet does not encourage or require a very high level of entropy in encrypted wallet funds, meaning the benefits of this security model are somewhat muted and in some cases, actually could be seen to be at a lower level of security than a custodial alternative.
Originally, Blockchain did not mitigate much against the weak encryption scheme, with wallets being protected against arbitrary attacker download through the use of what they called a "wallet identifier", or a uniquely generated id that served as a kind of password. This identifier suffered from a spate of security issues: users forgot their identifier and requested standard usernames, or users didn't keep their identifier secret. Since the knowledge of the identifier or username allowed an attacker to download the wallet, wallets with weak passwords suffered attacks where users lost funds. The scheme was later improved through rate limiting and multiple factor authentication, which mitigated the issue to a large degree.
From a portability perspective, lack of standardization in wallet files and wallet backups has presented problems for the wallet. In recent iterations this issue was improved, but users of previous versions of the wallet were left to the wind regarding their backup files: backup data present, but stored in a format not straightforward to access.
Legally, the concept of a rich client web wallet has yet to be tested, however that may point towards a vindication of this model. The author of the web service can argue: they are separate and apart from any money transmission, funds transferred are authored and executed by other parties, they are merely the neutral software mechanism.
submitted by pb1x to writingforbitcoin [link] [comments]

[Informational] [CC0] Wright and Wrong

Craig Steven Wright

Australian software enthusiast Craig Steven Wright, also known as CSW, born in October of 1970, is notable for making an unsubstantiated claim to be Satoshi Nakamoto in May of 2016.


It is known that Craig Wright is definitely a software enthusiast. He volunteered as an unpaid computer science lecturer at Charles Sturt University and paid to complete various technical certification tests: a GIAC certification in Compliance and Audits, a GSE Malware certification, and a GSECompliance certification.
Craig has claimed to have a doctorate in computer science, although when contacted Charles Sturt University made a statement to the contrary. CSU further went on to contradict his characterization of his employment there, clarifying that the position he had previously referred to was an unpaid volunteer role.
Craig has often referred to himself as a doctor in software contexts, but his only doctorate claim that is not questioned is that of a theological doctorate with a thesis relating to creationism.
Over the years Craig Wright has been mentioned in relationship to various marginal activities. Craig helped create a casino in 1999. In 2004 he was convicted of contempt of court and sentenced to 28 days in jail. Craig maintained his innocence, but the charges were held up on two separate appeals.

Bitcoin Claims

In recent years Craig has been mentioned in relation to a questionable deal in which his company claimed $54 million in tax rebates from the Australian government that were earmarked to reward tech industry investment in Australia. The circumstances around that substantial rebate have been called into question, by the Australian authorities and others. There remains a distinct lack of information as to whether the rebates were warranted.
Craig Wright claimed that his claimed government monies were to be used in relation to a Bitcoin related supercomputer project his company Cloudcroft was creating, in partnership with the well known computing firm SGI. His company circulated a signed letter on SGI letterhead declaring the partnership. But when asked to confirm the partnership directly, the SGI Chief Operating Officer denied any involvement with the project. He went further, stating that SGI had never even had any contact with Cloudcroft. No proof of the Cloudcroft supercomputer's existence was ever published.
In December of 2015, Craig Wright's house was raided by the Sydney police in a tax investigation relating to tax rebates. Part of the claims of this tax rebate related to Bitcoin: it was claimed by Craig that he had a large amount of Bitcoin in the makeup of his investments, but no proof of these assertions was ever made available.
Craig was in fact listed as a MTGox customer on leaked customer reports published in 2014, but only purchasing Bitcoin and after a large media blitz where buying Bitcoin was becoming increasingly well-known. By the leak's numbers Craig spent about five thousand dollars to acquire fifty coins, losing fifteen to the MTGox collapse. This raised a question, why would someone holding over a million bitcoins worth hundreds of millions of dollars spend thousands of dollars over a long stretch of time to buy fifty more?
In December of 2015, around the same time as the heated tax investigation into the veracity of Craig's Bitcoin investment and holding claims, unsourced rumors started to suggest that Craig is Satoshi. If he were Satoshi, it would have given great credence to his tax related claims of large Bitcoin related holdings and investment. Some of these rumors find their way into public stories published by news outlets, but no credible evidence is found, and some evidence that is produced seems to have been fabricated to mislead people into misinterpretation.

Satoshi Claims

It was revealed by Andrew O'Hagan in the London Review of Books that Craig had been working with some business associates on the assumption of his secret Satoshi identity. Craig privately claimed, but never showed proof, to many people that he was Satoshi, and had arranged a high stakes business relationship to create a large series of Bitcoin related patents in a very large multimillion dollar deal. As an advance on the anticipated profits, Craig was offered large sums of money, which he spent lavishly on ostentatious cars and clothing, to the chagrin of his business partners.
After 2015, the story died down due to the disproven evidence and dead-end leads. Craig and his partners, with a professional PR company, began to contact news outlets about publishing new evidence to his Satoshi identity, promising them a valuable story on very specific terms. Craig demanded that all involved sign non disclosure agreements and then go to meet him in a rented conference room to validate his claim. He demanded that only a computer produced by his assistant is used to cryptographically sign his proof, a computer that the verifiers are not allowed to keep for an inspection. Craig further demanded that he be allowed to add a modifier of his initials to a signing statement. The signing tool used was the Electrum Bitcoin wallet, but Electrum developers reported no UK IP downloaded the verifying software signature file that would confirm the software's legitimacy.
The entire setup of these in person proof sessions was created in a suspect way, leading experts to believe that an in-person proof could easily have been stage managed and faked. The reason stated for the careful controls was to avoid early release of the proof, however this could have been done in a remote way using a method of cryptography where Gavin could have been able to receive a personal proof of a signature that he would still be unable to use to publicly prove to the world was real. It's possible that Gavin was unaware of this cryptographic method, but then the lack of knowledge would imply that Craig and everyone involved in the proving sessions were not very qualified in cryptography related subjects. Gavin has previously stated that he is not a cryptography expert.
As part of his proof, Craig also reintroduced some of the fabricated evidence that surfaced during the December rumors. To counter the critics who pointed out the uselessness of the evidence, he produced and quoted verbatim a supposedly third party report substantiating the evidence and personally and separately attacking the people, mainly Greg Maxwell, who called into question the veracity of the evidence. The report in question was sourced from a paid technical evidence consulting agency located in the same city as Craig. This agency, with no known connection or published history with Bitcoin, addressed the unrelated Bitcoin Core project quite specifically and negatively, with views consistent with Craig's previously stated views. The writing style of the report, Craig's ability to repeat it verbatim, and the geological proximity and nature of the firm publishing the report suggested his close involvement with its creation. Although he printed and passed around the report to reporters, Craig did not disclose any relationship with the formation of the report.
In May of 2016 Craig Wright lifted the embargo on the story and declared himself to be Satoshi, with a lengthy blog post about how he could cryptographically sign a statement to prove he is Satoshi. At the top of his post he added a statement to sign stating that he is Satoshi, encoded in an unreadable machine format, as would be fed into the signing process he then went on to describe. At the end of the post describing how to derive a cryptographic signature from a statement, he quoted a cryptographic signature which could be run through the described signature verification to show that it is Satoshi's signature. However the signature at the end of the post did not sign the statement at the beginning of the post. Instead it was a well known and completely unrelated old signature from Satoshi. This fact left unstated by Craig was soon discovered by fact-checkers who referenced the signature against Satoshi's previously known signatures.
Given the missing evidence and suspicious circumstances and history, his claim was widely called a scam, although Jon Matonis and Gavin Andresen maintained their positions, despite the evidence of malfeasance. Gavin did express surprise at the lack of public evidence, implying that he was previously led to believe that the evidence would be public and inspectable beyond the confines of the fixed private demonstration. Even so, when pressed Gavin demurred from backing off his claim. Gavin also does not mention any separate evidence that he said earlier he would demand, such as private correspondence that only he and Satoshi would have been privy to.
One point of skepticism mentioned by evaluators of Craig Wright's published works is that there are no commonalities found between his writing style and that of Satoshi Nakamoto's published works. Even trivial style choices like choosing double spaces after every period, a signature of Satoshi's, was absent from Craig Wright's writings. Suspiciously, after this point was widely mentioned, Craig Wright started going out of his way to add multiple spaces after his periods in his HTML blog posts. HTML by default does not visually display redundant white-space, but Craig added special default override code to force its display.
After the ensuing the adverse reactions to his claim, Craig Wright contacted the press and put out statements to the effect that he would produce compelling public evidence, as previously was tacitly promised. He claimed to have evidence that would put to rest any remaining doubt with an extraordinary new proof. He asks Gavin and BBC reporters to send funds to Satoshi's known addresses, so that he can send it back. However as the time ticks down on his promise, he backs out, with a nonsensical and wandering statement about being worried to provide actual proof.
Gavin and the BBC's money was never returned to them.
submitted by pb1x to writingforbitcoin [link] [comments]

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