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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How to anonymously and privately purchase bitcoin through tor?

How can Bitcoin be anonymously purchased through tor in a secure and private fashion? My question is related to: How can I setup Bitcoin to be anonymous with Tor? Personal information and bitcoin ...
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What heirarchical deterministic derivation path is used for FIDO authentication on a Ledger Nano S?

What heirarchical deterministic derivation path is used for FIDO authentication on a Ledger Nano S? Does it ask for a different key each time or is it always the same key? If I connect to Google for ...
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Privacy: How should I handle UTXO's?

We know that, for security and anonymity, we shouldn't reuse addresses. Also, there is the idea of change avoidance to protect ourselves from any number of change detection heuristics. But I find ...
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Why is a privacy problem to pay always to the same address?

I know as a merchant it is not a good idea to receive all payments to the same address because then people could track our balance. But I don't understand why it could be a privacy problem if we ...
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Is it cryptographically possible to have aggregate signature schemes that can improve privacy in UTXO consolidation?

My understanding of Schnorr signatures, Taproot and Graftroot and how they improve privacy in smart contracts / multi-sig is by allowing users to aggregate signatures so the individual signatures and ...
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Privacy of sending CoinJoined UTXOs from wallet with unCoinJoined UTXOs

If I use something like Wasabi to CoinJoin my UTXOs and then send the outputs to a wallet with addresses containing UTXOs that haven't been coinjoined does this present a privacy risk?
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What are some proposed privacy features coming to the bitcoin lightning network?

If I'm correct, a bitcoin sent into a lightning channel technically looks like any Bitcoin transaction. From there if the channel never closes, the Bitcoins can essentially stay in a "locked" state in ...
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How does this time-stamping system work?

There is an online tool called Proof of Existence which uses the bitcoin blockchain to time-stamp documents. I'm reading the documentation but I fail to see how it works. I understand that it adds ...
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Are there any blockchain's that has a built in tumbler or coin shuffling technology built into their code?

I know dash has some kind of mixing technology in their blockchain using their master nodes, but are there any other blockchains that has a built in coinjoin or coin shuffling technology built into ...
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Why should I use a Bitcoin Mixer?

I understand that I can use Bitcoin anonymously using Bitcoin Core with Tor running a full node or with Electrum using Tor running an SPV node, why should I also use a Bitcoin Mixer?
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solving subset sum for two sets

Some bitcoin transactions (especially CoinJoin transactions) include two or more sub-transactions. for example, consider a transaction with Inputs = [2, 3, 4] and Outputs = [4, 5]. In this example, ...
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How can I hide my bitcoin transactions to protect anonymity from others?

Please take a look at this transaction link of bitcoin : https://www.blockchain.com/btc/tx/28d2e2117c9c19f9134225169365dd7c1dbb2051674cab373618b0796ac4zzzz My bitcoin address is : ...
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secure Multi-Party Computation (sMPC) in Enigma?

In Enigma whitepaper (>> Link to the Enigma paper <<), in section 5.1 "Overview of secure multi-party computation", page 4, explains how to divide a secret s into multiple shares, using ...
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Why is the length of the transport messages on the lightning network encrypted?

From BOLT 08 we can see that every message is sent in the following way: 2 byte: length 16 byte: MAC [length] byte: Encrypted message 16 byte: MAC In reality these messages will be send over TCP/...
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What's partial spending? What does avoidpartialspend do?

Group outputs by address, selecting all or none, instead of selecting on a per-output basis. Privacy is improved as an address is only used once (unless someone sends to it after spending from it), ...
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Why is the privacy for using watch tower services increased with unpredictable commitment tx ids?

In the open channel message in BOLT 02 the following statement is written about the various basepoints. The various _basepoint fields are used to derive unique keys as described in BOLT #3 for ...
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How secure is using TOR in Lightning Network?

In following paper (Link to the paper) we read: "combining Tor and Bitcoin creates an attack vector for the deterministic and stealthy man-in-the-middle attacks. A low-resource attacker can ...
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Does a HD Wallet log my IP when i do a transaction?

Companies like BitPay and Electrum, can log my IP when I make a transaction, right? If so, should I use a Web Wallet (plus VPN) for transactions?
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Examples of systems having multiple blockchains

When you first learn about blockchain it is made out to be a single public blockchain that contains all transactions from all users. But when you start considering privacy and performance, it seems ...
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How blockchain privacy works

I have just read this which talks about creating private blockchains and using a unique public/private key per transaction so you can't be traced. There are also "Zero-knowledge proofs" which I'm not ...
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off-chain payment channels: Do we need to trust “Payment Service Providers”?

A paper entitled: "Privacy in Bitcoin Transactions: New Challenges from Blockchain Scalability Solutions" has tried to investigate privacy issues of the Bitcoin influenced by the solutions for ...
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Can “Ring Confidential Transactions” be an alternative to “Zero-Knowledge Proofs”?

According to the Monero's paper on Ring Confidential Transactions, the Ring CT protocol is a currency which: requires no trusted setup, hides the identity of the recipient of a transaction, ...
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Single “Multiple Inputs Tx” vs Multiple “Single Input Tx”

Alice owns three addresses A1, A2, A3. She decides to collect the coins held by these addresses into a single coin so she generates a fresh new address A4 for that. She has the following two options: ...
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Information to recipient of the transaction

I have some questions of the transactions bitcoin, In a transaction bitcoin, there is not information on the recipient, right? How do services such as blockchain.com track information about a ...
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Why does my public IP show a Bitcoin Node is running when it is set up over Tor?

I've set up my node to run exclusively over TOR. But when I check https://bitnodes.earn.com/ and a few other sites with my public IP to check if a bitcoin node is accepting incoming connections, it ...
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How is my real identity linked to my bitcoins?

I am new to bitcoin and would like some clarification on its anonymity. Example: i buy bitcoins from an exchange and send them to my bitcoin wallet. The addresss that i sent the bitcoins to would be ...
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Any privacy considerations regarding allowing inbound connections for a Tor full node?

I wanted to know if there's any privacy considerations to take into account when opening the bitcoin ports on the router for a bitcoin node. I'm using -onlynet=onion in the bitcoin.conf file and I ...
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Is the unencrypted copy of the wallet still usable after a copy is encrypted?

My wallet is not protected with a password, I have a few receiving addresses generated and a some funds in it, then I make a copy of the wallet and I set a password on this one. Will the old ...
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Is there actually a dilemma of whether or not to publish channel states for LN nodes?

I've heard that there is such a dilemma for LN: if channel states were not published, the payer will not able to find any viable path, unless he takes brute-force-like probing approach (which looks ...
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63 views

Can PUSHDATA/OP_RETURN be used to break a trail of transactions permanently?

I was reading the Bitcoin wiki on how the Bitcoin protocol has no "From" address and the closest thing to a from address is a "previously receiving address". The article then proceeds to show a ...
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Do confidential transactions produce an UTXO

There must be magical cryptographic reason why CT doesn't create an UTXO. If it did make an UTXO, it'd be trivial to calculate the input + output right?
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Deanonymizing dust attack

What is the counter measure against dust attack, in case somebody tries to deanonymize me? Is there a possibility how to prevent somebody to send you intentional small dust, so that he can track your ...
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How much bitcoin is being sent to someone else in this transaction?

From this link which is a bitcoin testnet transaction. How can we be sure that this transaction spent a certain amount of satoshis to an address from another wallet? In this case the transaction is ...
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Is there an approach to exchange Bitcoin with formal currency with keeping anonymity? [duplicate]

Apparently, Bitcoin preserves anonymity of users such that nobody is able to know who is behind of an account address. But If this user intends to exchange a bitcoin with a formal currency, eventually ...
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215 views

Do the channel balances get publicly announced in real-time on Lightning Network?

In Lightning Network, is the balance publicly announced in real-time? On the one hand, it should be public as it is crucial to the routing mechanism. But, in case that the balance might reveal some ...
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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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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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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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zk-SNARKs vs. Zk-STARKs vs. BulletProofs? (Updated)

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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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 ?
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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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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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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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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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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 ...
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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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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.
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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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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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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 ...