Questions tagged [address-reuse]

Collects questions about using the same address on more than one occasion to receive payments, and the resulting issues such as multiple inputs in the blockchain referencing utxos associated with one address.

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21
votes
3answers
14k views

Is it safe to reuse a Bitcoin address?

Besides the obvious privacy implications, and (according to a bitcointalk.org forum post) the fact that once an address is used your coins that rest on it safety depend entirely on the ECDSA safety (...
14
votes
4answers
4k views

Can a Bitcoin transaction have the same address for input and output?

Can a Bitcoin transaction have the same address for input and output, i.e. spend some of the coins that are linked to an address and send the rest back to that same address? Is there some reason why ...
9
votes
1answer
3k views

Should I use a different address for every transaction?

Should I use a different address for every transaction? If yes, why? For safety? What happens I use the same address to get bitcoins from 2 different people, what happens?
8
votes
2answers
1k views

Why is the ledger public?

To me, banking is not a public thing. I don't want people to know what's in my bank account at what time, or who I sent money to. I know that I can make a new address for each transaction, as ...
7
votes
2answers
1k views

Why is the change address for a transaction the same as the originator address?

I was under the impression that if address abc has 100 BTC assigned to it, and it pays address def 20 BTC, 80 BTC will be transferred from abc to a new address ghi. But in this transaction: https://...
7
votes
3answers
877 views

Receiving donation on a bitcoin address and security issues of reusing the same address

I am running a blog and would like to receive donations from my followers. So I thought to add a bitcoin address on my "Support me"-page! But on bitcoin.it, it is recommended to never reuse addresses,...
7
votes
1answer
927 views

Does it hurt the network to reuse addresses?

There is already a question that ask why you shouldn't reuse addresses, but it's about whether or not it's a bad idea for the person who would do the reusing. I understand there are several reasons ...
6
votes
3answers
3k views

Can I receive Bitcoin on any of my wallet addresses?

Can I receive Bitcoin to any addresses from my wallet? I have more than one address on Coinbase, and it seems to change every day. Can I turn off the changing of addresses?
6
votes
1answer
435 views

Tainting with HD wallets

I'm having trouble understanding HD wallet privacy... for one thing, what if I want to send more money than I have in any of my individual derived addresses? Then I would have to use more than one, ...
5
votes
2answers
319 views

How does not practicing address reuse hurt my privacy?

If I never conduct transactions from an IP address associated with my real life identity and never conduct a transaction with someone who knows me in real life how can using the same address all the ...
5
votes
2answers
7k views

Why do wallets use multiple private keys instead of one each?

I am learning about Bitcoin and when I was about to export my private key from a single electrum wallet, I found that there were in fact a lot more than one. Why is that so, don't you only need 1 ...
4
votes
2answers
4k views

Sending from same address multiple times VS receiving to the same address multiple times

Is it completely safe to have multiple transactions sent to the same address? I have read that "using" the same address multiple times could be unwise. Does this refer to "sending from" or "receiving" ...
4
votes
2answers
357 views

Security implications of regular saving into cold storage

I am thinking about following this plan: Regularly buy bitcoins in an online exchange, 100€/month at market prices. Once the balance in the exchange exceeds a certain limit (500€), move those ...
4
votes
1answer
287 views

Are all UTXOs locked by an address spent in a transaction?

Imagine I have 2 UTXOs locked by my address, each of which allows me to spend 5 bitcoins. If I subsequently want to send just 2 bitcoins to someone else, will both UTXOs be used as inputs in the ...
4
votes
1answer
4k views

Static receive address instead of dynamic?

I have 2 BTC QT wallets (and 1 LTC QT wallet), and am looking for a generic receive address for my wallets. In Electrum, Mist/Ethereum and Rippex, I get a single unique address to receive. In the QT ...
4
votes
1answer
67 views

What information can an attacker gain from watching the users behavior in block chain?

Given the blockchain is a public ledger, if user chooses not not change their public key (address) every time they make a transaction, what information can an attacker gain from watching the users ...
4
votes
2answers
661 views

How to edit the label of an existing address exactly like in bitcoin-qt but instead using RPC calls?

I am trying to edit the label of a bitcoin address in my wallet outside of bitcoin-qt. Currently I only know of 'setaccount' but it results in two addresses after editing one, it assigns a new address ...
3
votes
2answers
109 views

How to accept Bitcoin payments using Bitpay and Electrum for a business

Our company uses a standard invoicing model where we bill our clients the service charge and require payment within X days. We'd like to be able to add a "Pay with Bitcoin" option on the ...
3
votes
1answer
73 views

Why is it a privacy problem to always pay 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 ...
3
votes
2answers
4k views

How to make permanent Bitcoin Address for donations?

I want to add a Donate Bitcoin button to my website(s). I want to create a Bitcoin wallet with a permanent address for receiving donations. How would I do this?
3
votes
1answer
414 views

Why new public key for every new request?

I created Bitcoin accounts using different clients but all clients I tried prompt for new public key for each request. My question is shouldn't be the public key one's identity which one should be ...
3
votes
1answer
523 views

How or why "a Bitcoin address is a single-use token"?

In the address wiki page it says that "a Bitcoin address is a single-use token". Do I have to understand one address is (or should be) used only once? More over, the Address reuse page seems to ...
3
votes
1answer
458 views

Does address-reuse make Bitcoin private keys vulnerable to quantum computing?

Though quantum computing can technically break ECDSA with enough qubits, this has not the greatest implication on btc because public keys are not known as they are protected by the hashing used to ...
2
votes
1answer
506 views

How do Reusable Payment Codes work?

I've recently heard about "Reusable Payment Codes" (BIP 47), and it sounds like a great feature, except that I couldn't find a simple explanation of how they work. Can anybody explain them please?
2
votes
1answer
99 views

Re-use change address as a receive address

Technically speaking, is it possible to reuse a change address from a previous transaction and make it a receive address? What are the pros and cons of doing so? This does look like a bad privacy ...
2
votes
2answers
390 views

If I reuse the same address can a previously used transaction be reused?

I was wondering, if I used an address adr0 to spend some coins in a transaction tx0 that give the coins to a different address adr1, and eventually, after some time, I receive some (completely ...
2
votes
1answer
60 views

Do miners have an incentive to confirm various transactions from same address?

Mempool is really clogged those days. I tried to make a transaction from one of my address to a friend. As we didn't care about confirmation time, I put a 5 sats/bit fee. 2 weeks later, transaction ...
2
votes
1answer
60 views

It is said that never reuse an address, but the news is stating biggest bitcoin addresses are buying?

It is said that we should never reuse addresses, so I think one time into the address, and one time out, and that address should be abandoned. So the top holders of bitcoins should know that too, but ...
2
votes
1answer
87 views

Address Reuse issue

I dont understand how security works with multiple address using. I am trying to guess how security works here but need some feedback, so here are a few questions, and my own guesses. If I have total ...
2
votes
1answer
82 views

How do non-deterministic wallets violate the principle of address reuse?

In chapter 5 of Mastering Bitcoin, Andreas writes: "The disadvantage of random keys is that if you generate many of them you must keep copies of all of them, meaning that the wallet must be backed up ...
2
votes
2answers
427 views

Why wipe all BTC from an imported address?

I've read a couple blog entries and tutorials on how to spend BTC that are "stored" on a piece of paper. They all suggested importing the private key into e.g. blockchain.info's wallet (or any ...
2
votes
1answer
62 views

Why Would Someone Not Use a new Change Address

I have previously asked questions and read about the importance of always using a new address every-time you receive a transaction, even for change. Sometimes when I watch the block explorer I see ...
2
votes
1answer
101 views

Should I send the remaining balance from a paper wallet to a new paper wallet?

If I withdraw all my money from a paper wallet, but don't end up spending the whole balance, should I create a new paper wallet and send that remaining balance to it as opposed to the old wallet?
2
votes
2answers
83 views

Can we design the protocol, so that an address can only be used once as an output in a transaction?

Most users reuse their addresses for deposits (ie. they receive money more than once on a given address). Can the protocol be designed in such a way that an address can be used only once as an output ...
2
votes
2answers
828 views

How can this input address have multiple values at the same time?

For the transaction: https://blockchain.info/tx/ee1658bb4d0de80a91d2e0005218d4cfab7c302a352458bd6afb6376b47fbf81 it looks like there are multiple inputs with different values for the same address. I ...
2
votes
0answers
74 views

Managing the bitcoin address gap

We're in the process of setting up bitcoin payments to fund accounts in our system. Using the C# BitcoinLib (https://github.com/GeorgeKimionis/BitcoinLib) to interact with the Bitcoin Daemon. Our ...
1
vote
1answer
491 views

Would reusing addresses result in a lower fee?

Let's say you withdraw 100 times from an exchange using a different address each time for a total sum of 1 BTC. Now you want to move this entire BTC to a new address. This would result in a ...
1
vote
1answer
2k views

Is there a way to generate new addresses for someone else's wallet?

I thought I saw this feature existed somewhere but I can't find the reference. Use Case: Alice needs to keep sending multiple bitcoin transactions to Bob, and wants to use a different payment address ...
1
vote
1answer
2k views

If the bitcoin address changes every time, why there is more than one transaction for an address in the ledger?

I was checking a random address in blockchain.com, there are alot of transactions that is done over this address. While in the website it is mentioned that the address is changing everytime! So it ...
1
vote
2answers
92 views

Static Wallet Address

How do I make my account static so the address stays the same. The bitcoin wallet address keeps changing and I need to figure out how to make it stay the same
1
vote
2answers
37 views

Why do wallets have more than one key pair?

I was looking into wallets and the information that they contain. I found this post: What information does a wallet contain? I thought that wallets have only one key pair. Why is there more than one ...
1
vote
1answer
82 views

Bitcoin's cryptographic protocol allows for leakage of information about one's Private Key, making recalculation of the private key possible?

Is it true that the cryptography which is used in bitcoin allows for leakage of information which could be used to recalculate the private key - IF you are continuously reusing the same public address ...
1
vote
1answer
36 views

Why do some addresses seem to send bitcoin to themselves?

When looking at block 630873, I noticed that some addresses seem to send BTC to themselves: Am I misunderstanding the situation, or does 1A7tWftaGHohhGcJMVkkm4zAYnF53KjRnU send large sums of BTC to ...
1
vote
1answer
141 views

Is it secure to put a wallet address on one's business cards as a QR code?

As a company, we're making business cards, and would like to put our bitcoin addresses on our business cards as QR codes. Yet, I know that it is a best practice for wallets to cycle addresses - I mean,...
1
vote
1answer
106 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 ...
1
vote
1answer
46 views

How can we know our "from" address in advance?

This website ask me to enter the address FROM where I would be sending BTCs. But every time a send some BTC it seems to be sent out from a different address... Should I use the one I always see when I ...
1
vote
1answer
119 views

Address reuse for business

The consensus is that address reuse is bad and should not be done. Bitcoin wiki even argues it hurts yourself and those who will own the bitcoins after you. However, unless I am mistaken, most ...
1
vote
2answers
116 views

Wrong address used

What happens if the coins are sent to the wrong address? The address I used in error was wrong and when I contacted the site it said that they only used addresses once. Since the address was ...
1
vote
0answers
51 views

Can I continue to use an old Bitcoin address? [duplicate]

I have a wallet on Blockchain.info and they generated a Bitcoin address for me. Now, I have another Bitcoin address. Can I still use my old Bitcoin address?
1
vote
1answer
215 views

If the sender address is known is it possible to find the recipient address?

Let's say I give someone an address to send me some bitcoins, when I eventually use these bitcoins to send to someone else can the person that has my address somehow know the address of the person I ...