Questions tagged [privacy]

Questions regarding the information that is leaked through cryptocurrency transactions or related processes, when subject to analysis and attempts of identification of sources and other properties.

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1answer
74 views

How would a P2P “Collective Transaction” be implemented (to increase privacy)

In this thread, Luke Jr mentioned Collective Transactions would be a way for clients to increase anonymity when issuing transactions. How would such an implementation work? (Please provide technical ...
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2answers
296 views

Which method is preferable: sender to send Bitcoins to eWallet/mixer first or to wallet on the PC?

Suppose a friend wishes to send some Bitcoins to me. In terms of anonymity, which of the following would be preferable? Have the Bitcoins sent to an eWallet/mixer first and then I withdraw them to ...
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3answers
3k views

Sending Bitcoins through Tor versus sending them through VPN

I bought a VPN subscription using Tor and Bitcoins. The commercial VPN service provider does not know who I am. Below are my questions: Could someone tell me whether sending Bitcoins through Tor ...
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1answer
1k views

Which Bitcoin mixer has the largest pool of customers? [closed]

As the title of the post states, which current Bitcoin mixer has the largest pool of customers? I understand that the larger the customer base of a Bitcoin mixer, the more anonymity the mixer will ...
0
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1answer
114 views

People who don't broadcast their IP address?

At https://bitcoin.stackexchange.com/a/9807/5228 Tom van der Woerdt wrote "people who don't broadcast their IP address". What did he mean by that? Is there a way to set up a particular Bitcoin client ...
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2answers
530 views

Watching and spending from a huge number of offline private keys

We plan to accept bitcoins on our eshop website. What we want plan on doing is: 1) Keep all private keys always offline (cold storage). 2) Generate at least 100,000 keypairs of which only one will ...
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0answers
92 views

Are we anonymous against governments? [duplicate]

If all transactions are public knowledge and coins are identifiable and thus traceable. With the power of subpoena can't a government uncover who bought the coin(s) from an exchange. It might be ...
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3answers
976 views

Are mixing services dangerous?

I'm thinking about using a mixing service like Blockchain.info's Shared Sending. I don't have anything to hide, it's just about privacy. My concerns are about where my bitcoins will go. I'm sure some ...
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2answers
1k views

Does the ZeroCoin protocol fulfill its promise of anonymity?

Zerocoin is a new cryptographic extension to Bitcoin that (if adopted) would bring true cryptographic anonymity to Bitcoin. Has anyone seriously analyzed the protocol and verified it works as ...
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2answers
412 views

Why is anonymity important in bitcoins? [closed]

Before I get started I would like to say I am an advocate of a virtual, peer to peer currency and bitcoins to an extent. I think some of the worst aspects of capitalism as well as huge amounts of ...
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1answer
218 views

Measuring levels of spammer participation on the Bitcoin network

Is there any reliable way of estimating the number of spammer controlled miners? I was thinking about the common wisdom that BitCoin should have been implemented with a hashing mechanism that is ...
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1answer
2k views

How can one remain relatively anonymous while using Ripple?

Inspired by this and that. What can an individual that uses Ripple do in order to remain as anonymous as possible? How do Ripple's "anonymity profile" compare to Bitcoin? One specific difference is ...
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0answers
198 views

How do I implement a blind multisig protocol?

I'd like to implement a 2-of-3 multisig protocol such that: Three parties generate private keys The private keys are never physically combined on one system - each private key never leaves its system ...
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1answer
2k views

Running Multibit on Tails - connecting error [closed]

I'm trying to get Multibit wallet set up on my new Tails USB. It's up and running, but isn't able to connect to the internet. It just says "Connecting" in red. The message log says this - http://www....
4
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2answers
564 views

Have there been case studies of how anonymous bitcoins are?

The blockchain has a lot of information about all bitcoin transactions. I've heard a lot of conjecture about how anonymous bitcoins transactions are, but I haven't seen a scientific study. Are there ...
5
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1answer
8k views

What and where is the easiest way to convert bitcoin back to cash without showing ID?

so im thinking about purchasing a big bitcoin miner, but the question now is how do i convert my BTC back to cash? I don't feel safe giving out my info to mtgox or other exchanges as they require ...
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4answers
9k views

What are tainted coins exactly?

I've come across the term of a tainted coin several times now. I understand that coins, or better, the origin of a coin can be traced throughout the blockchain. I've read that bitcoins can be ...
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0answers
90 views

How difficult is it to determine the owner of some bitcoins? [duplicate]

When Bitcoin was making the media waves back in 2011, a lot of it focused on the anonymity aspect of bitcoins, the hacks, and the illegal contents of the silk road onion address. From my limited ...
3
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1answer
93 views

Do the various Ripple clients leak any data about account names?

If I use the official client at Ripple.com, and add someone to my contact list ... does the information "I believe that X's Ripple address is Y" get stored anywhere in unencrypted form? Is it ...
14
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2answers
305 views

What are the privacy implications of filtered blockchain downloads?

There is now "Bloom filter" support in the network protocol for sending only relevant transactions to lightweight clients. What are the privacy implications of the bloom filter? Does it leak any ...
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3answers
478 views

Easiest way to set up non computer-literate person with Bitcoin

What would be the easiest/quickest way to get somebody who isn't computer-literate set up to have the ability to transfer money to me via Bitcoin? Also, Bitcoin touts that it is anonymous. Is it any ...
0
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1answer
277 views

Instawire fees over Bitcoin Central fees and their respective KYC policies?

Instawire, Bitcoin-Central, Instawallet, Paytunia and Paymium are seem to be closely related, they cross reference each other on their sites, though their respective guarantees for their services are ...
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2answers
798 views

Anonymity through paying by bitcoin

I am considering the VPN service Privateinternetaccess. One of it's payment methods is bitcoins. As described on this page paying with bitcoins strengthens anonymity. In contradiction, this page ...
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2answers
8k views

Is it possible to view others' transactions in bitcoin client?

This seems like a really basic question, but I'm having trouble searching for answers on it. My understanding is that my bitcoin client (Bitcoin v0.7.1-beta) has basically theoretically downloaded the ...
5
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2answers
688 views

Are there mixing services or online wallets that are explicitly compliant with anti-laundering laws?

I'm interested in mixing services (0% taint) that are compliant with the most conservative anti-money laundering laws. My goal is to have anonymity between peers in a transaction, but to remain ...
5
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1answer
817 views

What's the risk of publicizing a Bitcoin address?

What's the risk of public Bitcoin address, except person - account link is publically known. Or, is it preferable to have one such account?
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0answers
166 views

What additional actions should an ethical Bitcoin-related business take with each transaction?

I'm considering starting an ethical business for users that accepts Bitcoin as a payment. My intent is to abide by all laws and interpret them in an appropriate manner. My intent is to abide by ...
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2answers
471 views

Will an approved Bitcoin-like system replace Bitcoin?

What is the chance of another Bitcoin-like currency system to replace Bitcoin? Will Bitcoin still coexist with such systems? Will it affect then-current Bitcoin exchange rate? By Bitcoin-like, I ...
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3answers
131 views

Is there an application or a site grouping addresses by user graphically?

Addresses can be grouped as belonging to the same user (or, better, same "account") by grouping together the addresses that participate as inputs to a single transaction, and doing it transitively. ...
6
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2answers
443 views

Is it possible for a decentralized currency to have untraceable transactions?

I have been reading a bit about Bitcoin recently and am fascinated with the project and think it has great potential. However, one thing I think it needs in order to gain mass popularity is to make ...
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1answer
754 views

Bitcoin mixing and transaction sizes

I'm pretty clear on how a Bitcoin mixer obscures transaction history, but I don't understand how an observer is not able to reasonably link the source and destination wallets simply based on the ...
5
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1answer
916 views

Can a Bitcoin server have a .onion ToR address?

Is it possible for a Bitcoin server to have a .onion ToR address? If so, are there any in existence today? (Note: this is an alternative to hiding addresses via the Azure Service Bus)
5
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1answer
358 views

How does Blockviewer work? (tool to discover identities of “anonymous” bitcoin transactions)

I'm trying to follow the logical sequence of how Blockviewer works and only see this one blog entry for the process, but no "part 2". Can someone describe the techniques to link a wallet address to ...
6
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1answer
258 views

Vouching for (or against) the reputation of a bitcoin user

Since it's possible to link non obfuscated transactions to a "user" does is make sense, or it is possible for anonymized users with an established transaction history to "vouch" for another? I'm ...
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3answers
5k views

How do I pay for something anonymously from the UK using bitcoins?

I've seen the following guide but it's no good as I can't use bitinstant from the UK. Can someone recommend an alternative? Step 1. Download and install TOR Step 2. While using TOR create a Tormail ...
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1answer
2k views

How can one be truly anonymous without mining?

Assume that person wanting to be anonymous has reason to do so. Powerful enemies will see what is bought with bitcoins, perhaps web blog on server and domain name. Even in nations with rule of law, ...
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1answer
236 views

Are there any commercial nodes available so my transactions won't show my IP address?

Oftentimes my own IP address shows up as the "Relayed by ip" piece of data reported by Blockchain.info. Is there a commercial node available that I can conract with to act as relay so that my IP won'...
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2answers
495 views

Can a miner remain anonymous?

Can you differentiate the miners from the normal clients, by doing some frequency analysis on ip-addresses that announce new blocks? Or will the new block propagate so fast around the network by ...
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2answers
465 views

Can bitcoins be traced by pool workers?

A lot of people doing bitcoin mining participate in pooled mining. When participating in pooled mining the workers perform some mathematical calculation (that I have actually not understood) and are ...
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1answer
1k views

Linking a transaction to a Bitcoin user

Has anyone tried and perhaps succeeded at linking a transaction to a possibly controversial site (such as Wikileaks) to a Bitcoin forum user by their forum signatures? I know a lot of people disclose ...
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3answers
2k views

Which exchanges are Tor-friendly?

Mt. Gox's sign-up page states: Please be advised that accessing your account via the Tor network and/or public proxies may result in a temporary suspension of your account, and having to submit ...
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9answers
33k views

How can I hide my bitcoin transactions to protect anonymity?

I read many related questions about the pseudo-anonymity and bitcoin transaction tracking. So if I understand correctly, bitcoins, or better, transactions can be tracked for their entire lifetime. ...
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1answer
1k views

How to broadcast a transaction anonymously

Is it possible to broadcast a transaction to the network without revealing my personal IP address? My first guess is to connect bitcoind over Tor with proxy=127.0.0.1:9050. Is it the good way to do it ...
4
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5answers
331 views

Anonymity versus trust

Bitcoiners seem to love to talk about anonymity. But to me, anonymous transactions are far from Bitcoin's greatest strength. And to some, the need for high anonymity is the first sign that someone is "...
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3answers
622 views

How can I control which coins to spend in a transaction?

When creating a bitcoin transaction, you have to choose which coins to use in them. The standard client does this in a way to avoid unconfirmed inputs and minimize the number of inputs and amount of ...
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2answers
2k views

How much anonymity do mining pools provide?

How much anonymity does an average mining pool provide to the user (securing your email, other personal information)? What is the best pool to use if you want to remain anonymous, and which is the ...
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7answers
4k views

Are bitcoins INHERENTLY fungible?

Does each bitcoin has a unique identifier, like currency notes have serial numbers? If so, could you trace a particular bitcoin's ownership chain (ie find the current owner of a particular bitcoin by ...
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3answers
2k views

Does sending from a green address improve my anonymity?

If I am interested in improving my anonymity when dealing with a merchant, does sending from a Green Address help? My proposed steps for buying from a merchant as anonymously as possible would be: ...
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4answers
705 views

Does the bitcoin block contain minimal transaction detail? (Is it as private as possible given the proof-of-work design?)

From https://crypto.stackexchange.com/questions/508/could-one-prevent-double-spending-in-decentralized-digital-currencies-like-bitc "Now, the only information about the transaction that needs to be ...
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3answers
27k views

Knowing a single transaction can you track down a Bitcoin user?

I have used this transaction to donate to Wikileaks. I have applied no special techniques to obsure my identity. How much information can find out about me on the blockchain. What tools would you use? ...

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