Bitcoin Transaction Malleability, Zero Change Inputs and ...
Bitcoin transaction malleability: looking at the bytes
Bitcoin - The Currency of the Internet
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Worldcoin is a digital currency secured by cryptography. As a descendant of Bitcoin it shares many similarities but is more advanced and friendly to Brick and Mortar Businesses which require the fastest speed possible.
We have published the v1.4.3 of our Chrome app which among other things handles the Bitcoin malleability attack. This attack was disrupting the wallet by displaying double spent transactions and showing an incorrect balance. While the funds never were at risk, the display glitches were quite unsettling and a fix was necessary in order to filter the invalid transactions. Full changelog Ledger hardware wallet products
I should preface this post by saying that I am still very much a newcomer to bitcoin, and clearly still have more to learn about it, so forgive me if I sound somewhat ignorant. I'm considering making a serious and longer term investment in BTC, as opposed to the nickle and dime transactions I've been playing around with so far. I have a few questions about the long term viability of bitcoin. The research I've done so far hasn't told me whether or not the software that is bitcoin has the potential to adapt into something that a casual consumer could ever use. Here is a brief list of the sticking points that I've seen mentioned so far:
The length of the blockchain
If its true that in order for users to create/re-seed their wallets they need to download the entire blockchain, it seems likely that at some point the data cost and time involved in using the currency will make anything other than large scale transactions unfeasible. For example, what happens when the chain becomes longer than a standard smart phone can accomodate? If people can no longer store wallets on their phones, doesn't that limit their ability to engage in small, daily transactions (groceries, convenience stores, etc)?
My understanding is that for Bitcoin transactions to be truly finalized, it needs to be posted as part of a block in the block chain. If block chains are only posted every 20 minutes or so, doesn't that limit the ability of a casual consumer to make purchases with it? Even if a mass adoption of bitcon causes blocks to be posted more frequently, doesn't that exacerbate the issue of an evergrowing chain?
What happens when a group of very smart hackers finds a way to exploit some part of the bitcoin system? Unlike paypal or mastercard or any other centralized monetary system, bitcoin doesn't seem to have a unified overseer who can change parts of the system to secure it against exploits. I've heard of the BTC development team, but how much power do they actually have to manipulate the way that transactions are conducted? Could they really respond to a successful attack on the system? There are a lot of other inconveniences that bitcoin currently experiences (difficult of purchasing, small scale vendor adoption) that seem likely to resolve themselves over time as smart people find new ways to exchange and secure the currency. These don't worry me. My larger question is whether the framework of bitcoin is flexible enough to accommodate the changes that it would have to undergo to escape the problems mentioned above. Again, I apologize if this seems a stupid question to the forum. I would be overjoyed to hear that these issues are non-existent/ already being addressed.
Recently there have been many attacks where transaction was modified to generate new hash, however I am curious if its possible to take a transaction with multiple inputs/outputs and actually split that among other transactions. This way number of confirmations would be difficult to calculate since some parts of transaction could take longer to validate.
I have designed a basic program that simply automates the process done with the bitcoin malleability exploit. It is still in development. I have released the first trial version though: https://anonfiles.com/file/f2a95522549569c732e4cd0afebc2da4 Inside the archive is also a link to buy the product key for 1 BTC if you wish. The trial version only lets your run it once and can get you between 0.2 to 1 BTC depending on the miners active and the block. So the program is built to practically pay for itself. Note: It is an exploit and may be patched in the future, so try it while you can!
Hello, I made a mutate transaction from a transaction that wasn't confirmated. The mutated was broadcasted in the network but it didn't made any changes in the original transaction. Why nothing happens after i broadcast the mutated transaction? Thank you!
Hello folks, I recently made a transaction using my blockchain wallet - I sent coins to an address and about six minutes later another transaction popped up for the same amount. As far as I can gather this is the high-s/low-s malleability attack that is currently underway. At the moment my blockchain wallet is indicating that balance is lower than what it should be (eg, it's accounting for both transactions of coins sent). One of the transactions has 4+ confirmations, the other of course is unconfirmed. Will my blockchain wallet correct itself and restore my balance to what it should be? Is there any intervention necessary? What should I do? Thanks in advance for the help.
My take on explaining Bitcoin malleability to a layman
I'd like to explain things to 'normal' people because it forces me to learn and understand something so well that I can simplify something to the point that those people will understand without extensive prior knowledge. I'd like to take a stab at explaining Bitcoin malleability so I wrote this script to be used for a short video and blog post. I know this explanation takes a few shortcuts and isn't entirely accurate for example in the sense that Bitcoin tracks inputs and outputs, but to give someone a brief overview, these shortcuts are in my opinion necessary. I'd love feedback on the script, and if it's reasonable, I'll create the video and post shortly.
So, you heard about the malleability issue of Bitcoin. Let me explain how it works and what it really means for you. Let's say you hire Jane Plumber to fix your sink for $100. After Jane completes her work, you write a check for $100, sign it, and send to Jane, thinking nothing of it. [image of original check] Upon receiving the check, Jane annotates the check in some insignificant manner, for example by stamping it or writing a note that it has been received. She then sends the check to the bank to get the $100 deposited. [image of annotated check] In Bitcoin, the check is analogous to a transaction. It is a signed statement from you that you want to transfer an amount to someone else. To declare that you intend to do so, you publish a cryptographically unique signature, or in this analogy a unique image so that anyone can see that you intend to pay Jane $100. All of these images or transactions are store in the Bitcoin blockchain which is a public ledger of all transactions made by anyone. In this analogy each transaction is a picture of a check, a check signed by you, but that can be published to the public ledger by anyone who has that check. [image of grid of checks illustrating a transaction block] As such, when Jane annotates the check, she can also publish the annotated image of the check. The annotated check does exactly the same thing; it withdraws $100 from your account and transfers to Jane. However, because of the annotations, the image that Jane publishes is different from the one you publish. Although there are two check images published, only one of the images will be accepted by the bank or in this case the Bitcoin network. The details of how this happens is beyond the scope of this explanation, but involves a transaction history which ensures that you cannot give away the same dollar twice. However, a malicious attacker can exploit this if you are a bit naive. If Jane's image is the one accepted, Jane can call you and say that she never received the check. When you then go into the public ledger and search for your original image, it is nowhere to be found because it was Jane's image that got accepted. If you are naive, you may then write Jane a new check, and she can withdraw your $100 twice, once for each check you sent her. If this happened outside of Bitcoin, it would be very simple to check whether Jane was telling the truth. You can simply check your bank statement and see whether the charge for the personal check has been posted to your account. If so, Jane is lying and you can simply ignore her request. [image of bank statement] The malleability component of Bitcoin is the protocol's ability to interpret the intent of the check, so to speak, even if it has been annotated with certain pieces of information or decoration. It is still the same check designed to do the same thing, but it looks a bit different than when you originally signed it. Please also note that although you can make simple changes to a check or Bitcoin transaction, any change that is of importance, such as the sum you want to pay or to whom you send the money, can not be changed. If you attempt this, Bitcoin requires a new signature from you, and it's not as easy as just copying the signature from a paper check. Feel free to check out further resources in the comments below Script end Keep in mind, this is intended as a simplified explanation and not necessarily a technically accurate description, neither of checks nor the malleability issue.
Transaction malleability is a known issue and many services are mostly unaffected. What is being done. Bitcoin developers are collaborating with known affected exchanges to fix their internal systems and help resuming withdrawals as soon as possible. Bitcoin Transaction Malleability, Zero Change Inputs and How It Affects Bitcoin Exchanges Once again, transaction malleability is affecting the whole network of Bitcoin. In general, it can cause so much confusion above anything else and end up apparently having two the same transaction up to the point that the following block is mined. Today, transaction malleability is back in the headlines – albeit indirectly – thanks to the ongoing battle over how to fix Bitcoin’s capacity problem. The SegWit bug fix One group of people (Chinese miners, corporates and Craig Wright, who claims to be Bitcoin inventor Satoshi Nakamoto) want big blocks and huge $20,000 Xeon Phi-based ... What is Transaction Malleability? To understand transaction malleability, it helps to think of Bitcoin as a global ledger and transactions as bank checks, as described in my previous SegWit article.. A transaction identifier, called a transaction hash, is something like a fingerprint and is unique.Unlike a fingerprint, the transaction ID changes if the transaction it represents changes in any way. Transaction malleability attacks have however been mitigated on the Bitcoin network via the implementation of a soft fork protocol upgrade known as Segregated Witness, or SegWit. Segregated Witness With the implementation of SegWit, the signature data in the unlocking script is moved and omitted when calculating the Tx id of the transaction data.
How Segwit Works: Transaction Malleability Explained
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