Anonymizing bitcoins? [duplicate]

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1) Shared send from blockchain.info is a mixing service which bundles together transactions. Consider to sending addresses, A1 and A2, and two receiving addresses, B1 and B2. A1 wants to send coins to B1 and A2 to B2. To obfuscate both of these transactions, the shared send service sends A1's coins to B2 and A2's to B1 (this is a simplified version of what actually happens but shows the main point).

2) Coins that go onto the Silk Road are "tumbled" - mixed with other coins - so if fund a Silk Road account then withdraw your funds you should have clean coins (although potentially tainted by having come from a Silk Road-associated account if that is a concern).

3) Other mixing and tumbling services are available, though with generally less history and the associated risk that either the service won't anonymise you effectively, or that your coins will just be stolen.

4) Cash sales via Local Bitcoins, or private sales could provide a useful cut-out in any money...

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I'm a bit confused by your reply... sorry for my misunderstanding here.

The issue is duplicate share submissions. There are a few ways that have been posted on how to mitigate this behavior (for example, force the nonce to lower case):

_this.emit('submit',
{
name : message.params[0],
jobId : message.params[1],
extraNonce2 : message.params[2],
nTime : message.params[3].toLowerCase(),
nonce : message.params[4].toLowerCase()
},

Are there any other known fixes to address duplicate shares in NOMP?

Once the appropriate code changes have been made, is there anything other than restarting the stratum server that needs to be done? If so, what other steps need to be taken (not sure what crontab scripts you're referring to, please explain)?

Erroneous shares... if indeed it is the case that duplicate shares have been submitted, then writing SQL to clean them out...

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All Bitcoin transactions are stored in a public ledger called the blockchain. The data stored in each of these transactions includes a bitcoin payment amount and the Bitcoin addresses of the sender and the recipient (among other things). Because every transaction uses the bitcoins from a prior transaction, and the blockchain is public data, every Bitcoin payment has a traceable history that can be viewed by anyone.

Bitcoin addresses are not themselves linked to a person or entity. That’s why Bitcoin is often called pseudonymous or pseudo-anonymous. However, a person’s identity can be associated with a Bitcoin address through other means. Once that occurs, it’s possible to determine that person’s transactions backward and forward through the blockchain history. A single anonymity breach can uncover an individual’s entire Bitcoin transaction history.

But how is an address linked with a person? Most commonly, the association occurs when people publish their name together...

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Bitcoin is not anonymous, but, rather, pseudo-anonymous. By now, most Bitcoin veterans know this. It’s less obvious to many, however, why Bitcoin is not really anonymous by default, and what can be done to de-anonymize Bitcoin users – and what Bitcoin users can do to reclaim their privacy.

Below is an advanced beginners guide to get a better understanding of the nuances of Bitcoin and anonymity.

How do Bitcoin transactions work?

To better understand Bitcoin’s anonymity, it's necessary to first understand how Bitcoin works on a basic level.

Most importantly, the Bitcoin protocol effectively consist of a series of transactions. These transactions are basically a package of different kinds of data, among which are transaction inputs and transaction outputs. Inputs refer to Bitcoin addresses used to send bitcoin from, and can only be spent using the private key associated to that address. Outputs effectively refer to addresses used to send bitcoin to. Each...

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A Step-by-Step Guide to Creating an Anonymous Wallet for Covert Practices

With the recent Bitcoin “bubble” fiasco and the subsequent rise and fall of Bitcoin value, it seems that this subreddit has become obsessed with making money. But get-rich-quick schemes are not at the heart of Bitcoin. Instead BTC should be seen as a way to keep Big Governments and Big Businesses from knowing how much money you have and what you choose to spend that money on. As a currency, it doesn't matter how much the value fluctuates if you plan on spending your wealth on sites like the Silk Road and etc.

(OK, maybe it does matter a little bit if the money you spent yesterday is worth twice as much today; but this guide is for spenders, not hoarders. Or at least for hoarders who also like to spend.)

Let's discuss my favorite attribute of the Bitcoin protocol: anonymity.

Many noobs getting into the Bitcoin game fail to realize that anonymity is an important key to understanding...

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Bitcoin has a reputation in the public imagination for being an anonymous digital currency, like an internet equivalent of physical cash, but that is not entirely correct. When used normally, Bitcoin is more of a pseudonymous currency and not an anonymous one.

Anybody can download a simple piece of software and install it on their computer to use Bitcoin. Because it is a decentralized, peer-to-peer system, you do not need to register an account with any particular company or hand over any of your personal details (unless you choose to do so, for example with a web wallet provider). Once you have a wallet you can create addresses which effectively become your identity within the network. This already gives an enhanced level of privacy compared to other digital payment systems, because you can begin using the network anonymously.

There is also another side to Bitcoin, however. Because transactions must be confirmed by the network, and transaction history shared between...

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Cryptocurrencies, such as Bitcoin, seemed like a silver bullet to allow digital payments the following:

Anonymous online transactions similar to cash. No transaction costs. No risk of chargebacks (good for merchants). No taxes

Unfortunately, a lot of these points are not quite true. In this post, I am going to be discussing what I see as the most important aspect, anonymity.

Bitcoin's "Public Ledger"

The first thing that you must understand is that Bitcoin revolves around a blockchain which is often referred to as a "public ledger". This file or data structure lists how many bitcoins every "wallet" (account) currently has, as well as the amounts they had at any point in time since the system began. This is a problem in its own right as the file is becoming massive (currently over 10 GB), but is beyond the scope of this post.

In the world of bitcoin, you do not own "bitcoin" objects with unique IDs that get moved around. Instead if you were to buy...

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Jp Buntinx · February 21, 2016 · 8:10 am

Bitcoin nodes are an interesting trend to keep an eye on, as the digital currency’s network needs a lot of active nodes around the world to relay transactions. Up until this point, several people were running various types of Bitcoin nodes, including Bitcoin Core and Bitcoin Classic solutions at the same time. The redesigned NodeCounter website will eliminate duplicate nodes from appearing on the list, and show a clear representation of which code is leading the charge at any given time.

Also read: Linux Mint Backdoor Puts Users and Bitcoin Miners at Risk

NodeCounter Offers Plenty of Variety

When it comes to looking up the number of Bitcoin nodes in existence today, there are various parameters to keep in mind. Bitcoin Core is the main development fork of Bitcoin, and it is only normal to see its...

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Randomized fee

A low randomized fee between 1.9% and 2.1% is used to prevent advanced amount-based blockchain analysis.

Multiple destination addresses

Add more complexity and make blockchain analysis harder by using several destination addresses for your new coins.

Fast

Transactions are accepted after 2 confirmations (around 20 minutes), if no randomized delay is set your new bitcoins will be sent to you instantly.

Randomized delay

A randomized delay of up to 2 hours can be used to prevent advanced time-based blockchain analysis.

Many transactions in and out

Anonymizer supports receiving more than one transaction to your anonymizer address. Option to send as one or in many transactions per destination address.

No logs are saved

Logs and database entries older than 10 days are automatically...

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Bitcoin is a new kind of digital currency that, unlike other forms of payment, is designed for a world in which we are all digitally connected. Other forms of payment, like cash and credit cards, have their place, and probably won’t be going anywhere soon, but they aren’t really suited to the way we are going to be living in five or fifty years. Bitcoin is.

In fact, if you have a bank account, and especially if you use credit cards or PayPal, then you’re already using digital currency. If you own or trade stocks, you are using digital money. No one is walking around with bags of cash to settle up at the end of the day; most of the movement of money between these banks and businesses is nothing more than numbers on balance sheets.

The difference is that unless you are using cold, hard cash, anything you do with your money has to go through the banks, the brokers, or the credit card companies. And, as you know, they all charge their fees and have all sorts...

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By Milly Bitcoin – May 16, 2013

The Electronic Frontier Foundation (EFF) released a statement today about Bitcoin. It states in the footnote “the network doesn’t actively conceal the IP addresses from which transactions were initiated.” This article explains how IP addresses are handled on the Bitcoin network.

If you use a web wallet or a service that connects to a centralized wallet then this does not apply. Only those services that you connect to have your IP address. They broadcast the transactions so if there is to be an IP address collected on the Bitcoin network then it is their IP address.

Many people have visited Blockchain.info. When you click on any transaction you see a “Relayed by IP.” What they do is run a program that tries to connect to as many Bitcoin nodes as possible. They are connected to many more nodes than most users but not all of them. The first IP address they happen to see is what they report as the “Relayed by IP”.

IP...

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Visit the original article

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There has been a lot of talk about Bitcoin and whether or not it is anonymous. Cryptocurrency experts will gladly point out Bitcoin is not anonymous, but rather pseudonymous. For those people interest in de-anonymizing cryptocurrency, however, BitCluster is a solution looking into. This tool has now been open sourced, and users can download the kit, as well as the database, from the website right now.

Explaining what BitCluster does it not overly difficult, as this open-source tool is designed to analyze Bitcoin transactions. Moreover, this tool can also regroup Bitcoin wallet addresses based on their incoming and outgoing transactions. All of this information is taken from the blockchain, which is available to the public in real-time.

Should BitCluster Be Trusted?

However, there is a twist to this tool, as BitCluster allows for ‘more accurate mapping of entities online activities”. To put this into simpler terms, this tool...

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Last Friday, BitCluster was released at HOPE XI by David Decary-Hetu, and Mathieu Lavoie. BitCluster is a tool that helps one analyze the information found in the blockchain. The software builds a data base of nodes by associating bitcoin transactions together.

What this means is that for people who are not creating a new bitcoin wallet for every transaction, or if you are making multiple purchases from the same account; your sending a unique key to validate the data. This unique key is what BitCluster uses to track your transactions. This alone isn’t enough to out your identity information, but it does get the interested party a lot closer.

During the pairs talk at HOPE XI, Mathieu described their first try at mapping the blockchain as entertaining. At the run down they called Python script from the command line that started off analyzing around a block a second. Five blocks into it, it all stopped and went no further.

After the proper optimizations...

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With the built-in Darksend feature it is easily possible to anonymize DASH without having to send the coins to a trusted third party such an exchange. A big advantage is that you are the owner of the coins at every stage of laundering.

But what about Bitcoin? Does someone have a good overview of up-to-date options how to anonymize Bitcoins without an explicit convertion into another cryptocurrency?

Sending Bitcoins first to an exchange with a subsequent withdrawal into a new address is not a very feasible option. The exchange might know your real identity and can expose it upon request. If the exchange gets MtGox'ed or Cryptsy'ed, then you will never see your funds again anywhere.

I heard of mixing services, exchanging "old" Bitcoins to freshly minted Bitcoins for a fee etc. But who knows how and whether it...

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By Adarsh Dave

Motivation

The last decade has seen an explosion in the growth of e-commerce across the world. Online retail payments totaled nearly $300 billion in 2013, and remained the fastest growing market at 11.6% compound growth (IBISWorld)). PayPal is the king of the internet commerce world, with 91% of internet consumers using the service (Peng). Most internet transaction-mediating systems, like PayPal, rely on trusted third-party mediators – banking institutions. Users are often waiting for transactions to be verified, particularly with clients outside of each bank’s ecosystem and overseas clients. Users cede a chunk of control to the third-party financial institutions, trading the clunk bank bureaucracy with a sense of assured security of transaction.

Internet users demand security that ensures their transactions that: cannot be forged or altered, before, during, or after the transaction; are private such that recipient/sender information is only...

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When it comes to Bitcoin, privacy is a big deal to a lot of people, and it might be because they are partaking in a type of exchange that their government doesn’t agree with. It also might be because certain Bitcoin-related businesses may blacklist you due to using gambling sites. This article is meant to give a few pointers on the various techniques of tumbling Bitcoin by sending satoshis through the laundry.

Also read:The Hitchhikers Guide To The Invisible Internet

Why Tumble Bitcoins?

Recently there have been complaints on forums about Coinbase after using gambling sites, and this has been happening for a few years now. Coinbase explicitly states in their user agreement that sites like this are not acceptable. Then there are also those who use the Dark Net to visit marketplaces, which is not only frowned upon by some Bitcoin service providers, but also puts these users at risk of jail time and criminal penalty.

Precaution must be taken when using...

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2. Getting away with it

While Bitcoin has some features that make it great for thieves, it also has some features that make it not so great. The fact that the blockchain is public means that anyone can see to which address the coins were transferred next. After the Sheep Marketplace heist, some users tracked the thief as he or she moved the stolen coins from address to address.

Find a tumbler to launder your bitcoins

This tracking technique isn’t very helpful for the time being, since the thief’s identity is still unknown. However, Bitcoin forensics is getting better and better as programmers figure out new ways to extract information from the blockchain. A thief may leave traces that are undetectable now but could be uncovered in the future, inspiring a retroactive investigation.

That’s why this step, money laundering, is so important. Laundering Bitcoin is done with “mixers,” also called “tumblers,” which randomly crisscross your bitcoins with other...

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By Jacob Parks, J.D.

Recently, there has been some rustling from lawmakers and others that indicates a serious money-laundering threat might be upon us: decentralized digital currencies.

In June of this year, U.S. senators Charles Schumer and Joe Manchin appealed to the Department of Justice to do something about what they perceived to be a major money laundering threat. They pointed to a website called Silk Road, where people could anonymously purchase illegal items, such as drugs. The site’s payment mechanism of choice? Bitcoins -- units of a peer-to-peer digital currency that enable people to make payments over the internet almost instantly and without going through a bank or government. Schumer and Manchin urged for the shutdown of the illicit site and identified Bitcoin as a vehicle for money laundering.

But what are digital currencies, and should you lose sleep over them?

Decentralized Digital Currency
Digital currencies (also called...

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