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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2
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1answer
147 views

NXT single address per user vs bitcoin single address per transaction

In bitcoin, the anonymity is ensured by creating a new address for each transaction and by associating this address with a wallet. As far as I understand, with NXT, you use your account (calculated by ...
2
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1answer
194 views

colored coin possible with ring signatures and stealth addresses?

It is understood that colored coin is possible with stealth addresses, but what about ring signatures such as how they are used in the cryptonote protocol (Monero, Bytecoin)? I feel like coloring the ...
3
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1answer
155 views

Anonymous transactions technology for a cryptocoin? [duplicate]

I’m thinking of investing in a cryptocoin with anonymous transactions feature. So far there are 3 well-known technologies for that: coinjoin (Bitcoin), masternodes (Darkcoin) and CryptoNote (Bytecoin)....
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4answers
7k views

Are there any _true_ anonymous cryptocurrencies?

I've been looking into Bitcoin recently and stumbled upon numerous notes how Bitcoin is not anonymous at all, or how it's only partially anonymous and you can easily trace your funds. So, this ...
1
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1answer
151 views

Beginning the process of buying bitcoins

I am interested in the process of buying bitcoins, but I have many questions. First and foremost, how do I begin this process? I am looking to make my bitcoin wallet as secure as possible, so how ...
5
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1answer
1k views

BitLaunder's mixer vs “major exchanges” mixer

BitLaunder (seemingly created by syadasti) writes: Secure Launder renders your bitcoins completely untraceable, even to the most persistent forensic investigator. You deposit bitcoins into your ...
6
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1answer
736 views

Do thin clients leak which addresses you own?

According to this, thin clients use bloom filters to request "addresses and transactions they are interested in to the peer". And according to this, bloom filters are used to help prevent the SPV ...
3
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3answers
477 views

Bitcoin Exchanges and Anonymity

I'm new to Bitcoin and I have a few questions about Bitcoin Exchange and how the transactions work. To be more specific, the question is related about the level of anonymity of these transactions. 1) ...
1
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0answers
62 views

Are Bitcoins anonymous or tracable? Any changes from “How anonymous are Bitcoin transactions?”? [duplicate]

After the hacking and closing of Mt Gox there has naturally been some talk if there is a way to recover the lost coins. One "expert" commented that this would be a great test of the claim that ...
1
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1answer
202 views

Why does bitcoin use public keys as pseudonyms?

Why does bitcoin use public keys as pseudonyms? Is there any reason for that? What are the advantages of using public key as the pseudonyms? Highly appreciate if someone can give me an answer.
6
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2answers
292 views

Do bloom filters protect against a persistent eavesdropper?

As far as I understand it, bloom filters can be defined with some target hashes and false-positive rate. When filtering the blockchain, all of the target transactions are guaranteed to be found, but ...
1
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2answers
768 views

Multibit security — How anonymous is it?

Hi and I hope someone here can answer these security questions for me. I have downloaded the Multibit client onto both a windows laptop and also a separate download onto a laptop running ubuntu linux....
0
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1answer
49 views

What are some valid ways to obfuscate the scriptPubKey?

Is it possible to hide the balance of an address from standard clients who may be watching blockchain? I'm thinking about using script to modify the the key that is to be verified, but am having ...
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0answers
142 views

What can a US citizen do regarding the theft of Mt Gox PII data (Passports, etc) [closed]

A hacker is selling Personally Identifiable information (PII) stolen from Mt Gox. What can a US citizen do to protect their identity? What steps should they take? Should a passport be cancelled? ...
4
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1answer
3k views

Does Blockchain.info track IP addresses?

I use Blockchain.info for my wallet, I use a secure anonymous email address. My name and identifying information is never connected with my bitcoin, is it anonymous? How can I keep my bitcoin ...
5
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1answer
1k views

Can ISP intercept network messages to identify the IP of the transaction issuer?

Suppose my ISP is intercepting the bitcoin protocol communication. By analyzing traffic in the network, he could be able to determine that some transaction propagates from my IP (as there is no record ...
2
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2answers
2k views

Is it possible to know my ip address by simply connecting to the Bitcoin network?

It is saying that in order to stay anonymous, it is usefull to use Tor whenever connecting to the Bitcoin network. How does someone can discover my ip adress if I'm simply connecting to the bitcoin ...
2
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2answers
189 views

How can using Bitcoin with Tor improve privacy?

As far as I understand Bitcoin, user privacy and anonymity are hard to guarantee in the presence of multi-input transactions and shadow addresses. Some sites suggest using Tor to hide the source of a ...
2
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1answer
76 views

Anonymity while sending payment

Bitcoin wallet has the option of creating a new wallet address for receiving payment. What about for sending? Isn't my "From" address always going to be the same?
38
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3answers
14k views

What is a stealth address?

Stealth addresses are mentioned in the context of privacy of bitcoin transactions. What are they and how would they work? Can they provide 100% anonymity?
6
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3answers
323 views

How can I tell whether transactions were (not) made via BitPay / Coinbase?

Background Recently, Rep. Steve Stockman posed for a photo op with his Bitcoin address on a big QR code, which got shared. He has a Bitcoin donation page which asks for identifying info and goes ...
4
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3answers
140 views

What if you wanted to decrease anonymity?

My idea is to be able to build "credit" for an individual. Lenders of BTC could just use a service to check the "credit score" of a certain address of a borrower. The borrower would have to spend a ...
0
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2answers
164 views

About to open my first wallet

a couple of question before I have my own wallet. Does having a wallet require personally identifiable information? Do I need to use my real first and last name or company name, etc? It seems that ...
2
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2answers
265 views

How did Silk Road work when it came to delivering product anonymously?

A lot of times, people say Bitcoin is anonymous, but I know most transactions can be easily traced using IPs that used ewallets and by making connection with other bitcoin addresses. So with that in ...
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2answers
340 views

Holding of 9% of all bitcoins?

In this discussion: https://bitcoin.stackexchange.com/a/9057/10490 One of the users mentions a wallet with 9% of all bitcoins. My question is: Is this true? What could be the source of this ...
7
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1answer
261 views

Bitcoin Node Data Leakage

Besides an IP address and broadcasting transactions, what other pieces of information can be derived from a Bitcoin node in the network?
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4answers
2k views

Are there any Web Crawlers for Bitcoin addresses?

In an effort to "track the chain" I wonder if there are any Bitcoin web crawlers that specifically look for Bitcoin addresses. Following on to that question, are there any groups/volunteers/ people ...
7
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1answer
199 views

What metadata can be captured by a single miner? What about a group of miners?

It is my understanding that the blockchain consist of the following information for every transaction in the network: From address To address Amount of bitcoins What additional information can a ...
2
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1answer
273 views

Do we know who runs the big mining pools?

After looking at the hashrate repartition https://blockchain.info/fr/pools. It seems to me that bitcoin is quite centralized, and that two big actors (mining pools company who run the bitcoind server) ...
10
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4answers
3k views

Explain how CoinJoin enhances anonymity, in plain English?

I just learned about CoinJoin, but I don't really understand all the jargon being thrown around. Can someone explain how this works where a 10-year-old can understand?
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2answers
74 views

Payment Protocol: Is using different addresses for refunds just because of privacy?

One of the features of the new payment protocol is that it allows the customer's wallet to automatically send a refund address with the transaction to the merchant. Why would the refund not be sent ...
4
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1answer
252 views

What are the specific problems that Virtual Currency is solving? (in the Banking system, economics, and finance )

What is Virtual Currency is trying to solve, and how is it trying to solve them? Many users of virtual currency (BTC, XRP, etc) talk about a corrupt banking system, and many other ideals, but I'd ...
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1answer
55 views

Would it be possible to make Trophys / Achievements from bitcoin experience

One Trophy could be: "First output signed" And many more milestones on the road to the more advanced usages of the network: "First multisign/multispend", "First completed ANYONECANPAY transaction" ...
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2answers
603 views

What are the “Know Your Customer” challenges that Bitcoin faces?

Can anyone explain what KYC (Know Your Customer) regulations are "missing", tough or impossible to implement with Bitcoin? I will offer a bounty to the most detailed answer (However this question is ...
0
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2answers
83 views

Large pool of addresses means more anonymous? how?

For an average end-user, if bitcoin-qt is configured with a large pool (1 billion) of Bitcoin addresses, then will it increase user / transaction anonimity?
5
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2answers
4k views

Anonymizing bitcoins? [duplicate]

Is there any way to anonymize bitcoins? It doesn't need to be AML-proof, or even completely anonymize their source, I'd just like to obfuscate the source of the bitcoins more effectively than sending ...
2
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0answers
926 views

Anonymous (no ID, no verification) Payments to PayPal?

Not looking for a discussion on how Bitcoin payments can be traced and it's not truly anonymous. I'm not looking for total anonymity, I just don't want the merchant or payment processor to identify me....
5
votes
1answer
589 views

Is an exchange a good substitute for a mixing service?

Isn't an exchange such as MtGox essentially a mixing service? I might be wrong, but can somebody trace coins when they are paid to one address, possibly exchanged, and another amount is paid back from ...
4
votes
1answer
470 views

Where is the bitcoin automatic address generation?

I have head of the automatic bitcoin address generation feature for every transaction. I have done multiple transaction, but I still have the same addresses (I have two addresses). I would like to ...
2
votes
1answer
73 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 ...
0
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2answers
293 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 ...
7
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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 ...
2
votes
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
votes
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 ...
4
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2answers
527 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
89 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 ...
5
votes
3answers
967 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 ...
16
votes
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
406 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 ...
0
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1answer
217 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 ...