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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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35 views

Can't understand specific problem of Bitcoin anonymity

There is an problem shown in bitcoinwiki: Someone runs both a money exchanger and a site meant to trap people. When Mr. Doe buys from the exchanger and uses those same coins to buy something ...
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1answer
35 views

How can someone get my private data (such as email, name, IP …) from bitcoin transaction?

I am curious about privacy of bitcoin transactions. I heard that if you are good enough at hacking, you can get private data from bitcoin transaction, or associate someone to transaction. How is it ...
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0answers
16 views

Is “Hawk” (a decentralized smart contract system) able to provide acceptable privacy for blockchain?

According to the Hawk paper: "Hawk, a decentralized smart contract system that does not store financial transactions in the clear on the blockchain, thus retaining transactional privacy from ...
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1answer
19 views

Can “Confidential Addresses” preserve user privacy?

Can using "Confidential Addresses" be an alternative to zk-SNARKs to provide an acceptable privacy for a user? And when we talk about "Confidential Transactions", does it mean we are using "...
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0answers
34 views

zk-SNARKs vs. Zk-STARKs vs. BulletProofs?

zk-SNARKs, Zk-STARKs and BulletProofs are three major zero knowledge proofs to provide privacy for the blockchain technology. If we can compare them, (1) Bulletproofs and Zk-STARKs require no ...
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0answers
12 views

How is “level” of user privacy in “Zerocash” (Zcach)?

Is it correct that Zerocash allows two users to engage in transactions without either party revealing their addresses (their public key) to the other? Or it only ensures privacy of the content of the ...
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1answer
21 views

Zerocoin vs. Zerocash ? are they the same ? Or two different protocols?

what is the main difference between Zerocoin vs. Zerocash ? are they the same ? Or two different protocols ? If they are two different protocols, what are similarities ?
2
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2answers
90 views

Are there any risks on publicizing a Lightning network invoice?

What are the negative effects of publicizing a LN invoice either before or after its payment? From what I understand, after its payment it won't allow a 2nd payment of the invoice, so 3rd parties ...
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0answers
8 views

Is it possible to hide the sender or receiver of transactions by “zk-SNARK” or “Bulletproofs”?

To support the user privacy, is it possible to hide the sender address or receiver address of transactions by "zk-SNARK" or "Bulletproofs" ? Or we’ll be able only to hide the value that is mapped to ...
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2answers
36 views

Is it logical to use “Proof-of-Authority” for a “public” blockchain?

According parity.io website: Proof-of-Authority is a replacement for Proof-of-Work, which can be used for private chain setups. And also: The chain has to be signed off by the majority of ...
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0answers
25 views

What’s the point of wannacry for exchanging Bitcoins to Monero?

At first glance, exchanging Bitcoin for Monero makes sense. But why use Monero with an exchange, which is likely to help the police? (And which did.) Monero transactions are private only on the ...
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2answers
126 views

Is It Possible to Prove Ownership of Public Key Hash without Public Key?

I am building a system where I would like the user to specify a public key hash of a wallet that they have control over in the event of tips, refunds, and/or otherwise needing to send value back to ...
2
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1answer
86 views

Is Bitcoin anonymous? [duplicate]

Bitcoin transaction's anonymity depends on public-private keys. The digital tie between a public and a private key is stronger than the tie between a person and his DNA. If you committed a crime but ...
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0answers
19 views

Can we decide where the data should be stored on the blockchain in Stellar?

Due to the GDPR rules, we know that the data of all the users in EU should stay in EU. How do we know whether the data of the users using Stellar is being stored in EU? Can we have a permissioned node ...
1
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1answer
19 views

Mobile Android Wallet for Dash that lets you do a private dash send transaction?

As of today 2018 June, is there an Android wallet that lets you do a dash private send? I know coinomi has Dash, but it doesn't have the privacy send features.
1
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2answers
47 views

Can malicious payer deanonymize payee in Zcash?

Looking at both the Zcash original paper and the updated Zcash protocol specification, it seems that after Alice paid Bob, she can reveal to the world that she did so. Alice can do so by revealing ...
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2answers
55 views

Understanding “anonymous transaction”

I have read In the original Satoshi whitepaper, it was recommended that Bitcoin users use a new address for each transaction to avoid the transactions being linked to a common owner. But in ...
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2answers
152 views

Can the wallet's balance be deduces from the wallet's address and the blockchain's history? Is this concealable?

Since all bitcoin transactions are public, I guess that all transactions could be summed up to get any wallet's balance. Thus sharing a wallet's address means sharing the whole wallet's data. Even ...
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1answer
107 views

How do we know which miner or pool mined a block?

There are websites that talk about each mining pool's total % of hashrate. I think they do that by calculating what % of the last X blocks were mined by a particular miner/pool. But how can we know ...
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4answers
46 views

Why blocks are validated instead of transactions?

In most of the conventional blockchains, blocks are validated instead of transactions. Why cant' transactions validated directly? The structure of basic blockchains are linked lists, by having DAGs, ...
1
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1answer
256 views

How can I use Bitcoin privately with the Electrum wallet and Tor?

I do not want to run a full node like Bitcoin Core but still want privacy running an SPV node like Electrum wallet to use Bitcoin. How can I setup to run Electrum privately with Tor?
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2answers
24 views

How can I confirm to whom the bitcoin address I sent a payment too?

Where can I find out what company is associated to the address I sent a payment too?
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0answers
23 views

State of privacy-preserving light clients

Currently, it is trivial to operate a SPV wallet in Bitcoin at the cost of a lot of privacy due to the necessity to connect to full nodes that offer SPV services. Neutrino, currently being worked on ...
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0answers
23 views

After IP sent from A to B, can it be sent through same connection from B to A?

The paper "Deanonymisation of clients in Bitcoin P2P network" describes a method for learning a set of immediate connections ("entry nodes") for a Bitcoin node. The naive approach ("which IPs relayed ...
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1answer
38 views

Is there a way to link a bitcoin user's transaction to entering a lightning network channel?

Since lightning channels are offchain. When you send bitcoins to a lightning network node or wallet. Is there a way for companies like chainalysis to see if your on the lightning network? And then ...
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0answers
10 views

What is considered to be sufficient anonymity set?

We know that 2 is insufficient and 10,000 is more than enough. We also know JoinMarket can achieve about 2-6, Monero 2-3, but there all transactions are mixed, so they add up, CoinJoin can do 400-...
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0answers
200 views

Mixing Unequal Inputs

Let's say have 3 inputs (alice, bob, satoshi): 0.3, 1.3, 1.6. We can mix these inputs for example like this: 0.3, 0.3, 0.3, 0.3, 0.3, 0.3, 0.3, 0.3, 0.3, 0.3, 0.1, 0.1. Or like this: 1.3, 1.3, 0.3, 0....
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2answers
81 views

Why does bitcoin not have something like nicknames?

It would be much easier to exchange bitcoins if everyone could have one or more unique nicknames on the blockchain. Of course what should not be possible is that other people can check the balance by ...
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2answers
50 views

What can be done in order to improve privacy in bitcoin transactions?

Privacy should be default and not an optional property - even when using stealth addresses or confidential transactions, your bitcoin balance and transactions in the wallet are transparent to anyone. ...
2
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2answers
118 views

What are main advantages of Bitcoin over Monero? [closed]

In the world of full spectrum surveillance, since some time it has become more than evident that Bitcoin isn’t that anonymous at all. All transactions can be traced on the blockchain. There is a ...
0
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1answer
182 views

What consensus algorithm is MimbleWimble/Grin using? Does it use Zero Knowledge Proofs as well?

Understand that MimbleWimble/Grin is privacy centric. Does it use Zero Knowledge Proofs to achieve the privacy goals? In addition, what consensus algorithm is MimbleWimble/Grin using?
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0answers
41 views

Confidential Transactions and the downsides of transaction privacy

I'm wondering whether there are resources discussing the following, or whether people have thought about it significantly: The potential downsides to the introduction of Confidential Transactions ...
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1answer
52 views

Share private data and prevent data forwarding

Let's say A has some private medical records of patients and B is a pharmaceutical company who wants to view medical records from A to find out the effect of a particular drug on the patients (run a ...
0
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1answer
58 views

How Bitcoin wallets avoid address re-usability?

As we know, address reusability compromises both privacy and security. My question is how Bitcoin wallets avoid address reusability? Is wallet generates an address from index 1 and scan blockchain ...
0
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2answers
40 views

Create a non-changeable bitcoin address?

How to get a non-changeable bitcoin address. I tried to register on few bitcoin wallets websites but on each website btc address is changed after one payment is received and I didn't find the option ...
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2answers
142 views

Bitcoin Core Wallet - Really Anonymous?

how does one remain truly anonymous on bitcoin network? Say, for example, if one use the bitcoin core as its wallet, while sending one's first transaction, will his/her IP be somehow revealed at that ...
0
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1answer
32 views

What are list of privacy coins available today?

Where can I get list of privacy coins which I can invest on? Is it a good option to invest on these coins?
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2answers
88 views

How does an anonymous cryptocurrency encode coin values

I'm pretty sure I understand how cryptographic accumulators work to anonymize a coin's history, for example as described here: https://anoncoin.net/Cryptographic_accumulator/ but I have read that ...
2
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0answers
45 views

What impact on privacy does it have when a service like Coinbase starts using batching?

In the recent discussion of Coinbase's sending outage, the question was brought up how the privacy of Coinbase's customers would be affected if Coinbase started to use payment batching instead of ...
3
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1answer
53 views

How can I protect my privacy?

Let's say I want to send BTC to a friend. This friend can now explore the blockchain and find how much money I have or what other purchase I've done or will do. What can I do in order to prevent him ...
1
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1answer
53 views

Can one trace a criminal with his Pubkey?

Say FBI arrested a guy who bought some drugs using bitcoin. Then, is it possible for FBI to trace a drug dealer using the arrested guy’s PrivateKey and his transaction histories? If my understanding ...
3
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2answers
99 views

What information is available from the blockchains of privacy currencies?

Some currencies such as Monero and Zcash focus on protecting user privacy as much as possible. What information is available from the blockchains of these currencies? Number of wallets? Transaction ...
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0answers
60 views

Scamd by antminer.hk please help me [duplicate]

i have ben scamd for over 2258$ by antminer.hk Can I trace a Bitcoin wallet owner using their wallet address? or is ther any way i can get back my money. I have a new baby and i invested everything ...
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0answers
32 views

Bitcoin Mixing? Is it even real?

I have been trying to find a "bitcoin mixing" service but it seems that ALL the "bitcoin mixing" sites I have looked at are scam. Does anybody know of any that are actually real and do what they say ...
0
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1answer
28 views

I have read many times that bitcoin is a public blockchain. Why is that?

Is there some special reason that Satoshi made bitcoin like this. Wouldn't in a private blockchain, transfer of currency would be more secure? Also, is it possible to create a separate blockchain to ...
14
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2answers
2k views

Is my account balance publicly visible?

If I'm sending someone my wallet address, am I making my account balance visible to him? As far as I understand, all transactions are public, which means that if I know an address, I can reconstruct ...
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2answers
1k views

Finding IP addresses of all bitcoin miners

I understand that the transactions don't have any IP info in them but I am curious to know if it is possible to enumerate over list of all the IP addresses involved in mining?
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0answers
24 views

Relationship between different transactions

I often see someone says that Bitcoin can't really ensure privacy, despite it uses pseudonymous addresses For example this post:Coin Join transaction mixing It is said that it's possible to track ...
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1answer
68 views

Does 'Mixing' in bitcoins really add up protection to my bitcoins?

I was researching on simple ways to protect bitcoins without using unknown/untrusted software or solutions. It took my attention to 'Mixing' in the bitcoins with a friend's bitcoins and transfer back ...
1
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1answer
76 views

Can a Bitcoin wallet be identified as belonging to an exchange?

Ethereum wallets can be associated with Exchanges (e.g. Etherscan.io will tell you if an address is a Poloniex one). Is this possible for Bitcoin addresses?