Questions tagged [address]

This tag should be used for Bitcoin addresses. A Bitcoin address is an encoding of the hash of an ECDSA public key or a script. Knowledge of this value allows a user to send Bitcoins to another person over the network. Bitcoin addresses begin with a '1', '3', or 'bc1'. Not to be confused with mailing addresses or IP addresses.

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115
votes
11answers
57k views

Is it possible to brute force bitcoin address creation in order to steal money?

Bitcoin users frequently generate new addresses for each transaction they make, which greatly increases the number of bitcoin addresses being used to receive money. Would it be possible (and ...
64
votes
4answers
23k views

What is a compressed Bitcoin key?

The standard Bitcoin client in version 0.6 apparently introduces compressed keys. What are they? Are there any drawbacks to using them? Any incompatibilities with older software? Reductions in ...
54
votes
5answers
56k views

What happens if your bitcoin client generates an address identical to another person's?

Here's a what-if scenario: Person A has a Bitcoin address with 25BTC. Person B opens up their Bitcoin client: which may or may not have the complete blockchain (the latter would mean no copies of ...
42
votes
3answers
11k views

Why does Bitcoin send the “change” to a different address?

For example I have an address (A) with 20 BTC and send 9 BTC to address (B). Bitcoin will create a "change" portion of the transaction where the remaining 11 BTC goes to address (C). Why not send ...
40
votes
3answers
53k views

What's the difference between a wallet and an address?

Bitcoin seems to have the concept of a wallet and an address. Are they the same thing? If not, how do they differ?
38
votes
7answers
24k views

What happens if I mistype the address when making a payment?

I sent bitcoins to an address, but I think I made a typo when I copied it. Where did these bitcoins go. Can I get them back?
38
votes
3answers
13k 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?
38
votes
2answers
8k views

What are Green Addresses?

What are Green Addresses? Is it true that they can solve the "confirmation delay" problem, and how does that work? Are there any drawbacks?
35
votes
9answers
19k views

How is it possible to launder bitcoins?

Some services, such as bitcoinlaundry.com, claim that they can launder your bitcoins. Since all bitcoin transactions are publicly logged, how is this done? Wouldn't it be possible to trace back the ...
29
votes
5answers
13k views

How are public & private keys in an address created?

I understand the high level concept I am more interested specific details. How is a private key generated. How exactly is public key generated, how is address generated from public key.
26
votes
2answers
9k views

Why does Bitcoin use two hash functions (SHA-256 and RIPEMD-160) to create an address?

Why do we use 2 hash functions (both SHA and RIPEMD) to create an address? Why not just use one hash function?
26
votes
1answer
16k views

How secure is blockchain.info?

How secure is using a wallet on blockchain.info? How do you evaluate the different sites that provide wallets?
26
votes
2answers
7k views

How many Bitcoin addresses are/have been carrying a balance?

Bitcoin addresses can be generated at will, and the theoretical limit to their number is high. Addresses are constantly being generated to receive funds or balance transactions, but they are also ...
26
votes
1answer
5k views

Why are Bitcoin addresses hashes of public keys?

Currently, Bitcoin addresses and their checksums are constructed from the public key by a using repeated hashing with SHA256 and RIPEMD160. Now I understand the reasoning behind using hashing for ...
20
votes
5answers
941 views

Is there an easy way to give people a Bitcoin address?

I see that Bitcoin addresses have built in checksums that helps prevent typos (ie. it is highly unlikely that you can mistype a Bitcoin address and have it still be valid). However, I still think the ...
19
votes
2answers
5k views

The Bitcoin.it wiki says addresses do not carry balances…but all info suggests otherwise

The Bitcoin wiki states, "Addresses are not wallets nor accounts, and do not carry balances." Yet, there's a zillion articles online about Bitcoin address balances, the Bitcoin blockchain explorers ...
19
votes
2answers
8k views

How will multisig addresses work?

How will multisig addresses work? Will they consist of multiple traditional addresses, or will they have some different structure? Will one be able to specify whether they will require 2 out of 2, 2 ...
19
votes
6answers
7k views

What is the longest known vanity address generated?

Anyone can generate a vanity address of arbitrary length with appropriate tools, it's just a matter of performing enough computations. What is the longest known vanity address anyone has generated?
19
votes
3answers
4k views

Why does Bitcoin support both compressed and uncompressed keys/addresses?

My question is about the difference between compressed keys and addresses, and i know it was addressed in another question but my question is less about the theory and more about how the keys are used ...
15
votes
2answers
4k views

Why do you use Bitcoin addresses instead of public keys?

Why do you hash the public key twice? Are there security benefits to abstracting away from the public key? Is it because the address can represent multiple things? I'm missing something. Could you ...
15
votes
2answers
32k views

What's the difference between `z-addr` and `t-addr` type addresses?

I was playing with the zcash testnet and figured there are two different types of addresses available: z and t. Is this a privacy feature? What's the difference between z-addr and t-addr type ...
15
votes
2answers
5k views

Can two private keys generate the same (public) Bitcoin address?

I know that private key is generated randomly by wallet. Is it possible that wallet generate the same address which is used in Bitcoin? In other words: Given two private keys ka ≠ kb, is it ...
14
votes
5answers
11k views

How to validate a Bitcoin address is a real one?

Is there a code snippet that validates a bitcoin address? I'm looking for both javascript and java snippets. The code should support both testnet and real addresses.
14
votes
3answers
16k views

Do faucets actually work?

Doing a simple Google search shows that there are many places on the Internet that say that they give out free bitcoins. All you need to do is give them your deposit address and confirm that you're ...
14
votes
4answers
10k views

How are different Addresses generated from the same Private key?

I was reading in the "Technical background of version 1 Bitcoin addresses" that addresses are a function of the private key. More or less: Private Key -> Public Key -> Address If the Public ...
14
votes
4answers
9k views

Is it possible to figure out whether two addresses are in the same wallet?

I'm wondering, if I sent some bitcoins from one of my own addresses to another address in my wallet, will it be possible for someone to figure out that both addresses are in the same wallet? Or can I ...
14
votes
2answers
2k views

Is a wallet just a collection of private and public keys?

There is a fundamental bitcoin concept I don't get. Am I correct in that all I "need" to send and receive money are a single address and its associated private key? In other words, can't I just ...
14
votes
5answers
650 views

Why does the standard Bitcoin client not display the balance per address?

Any Bitcoin wallet holds several bitcoin addresses. Such addresses are either generated manually from the GUI addressbook or automatically collecting the "change" of a "Send" transaction. The total ...
13
votes
5answers
13k views

How do you send to multiple addresses by paying a one time fee? Which wallet supports this?

I have 20+ addresses I need to payout to. How can I send to all of these addresses without having to do it one at a time and paying a fee for each? Which desktop and mobile wallet supports this type ...
13
votes
3answers
800 views

What's stopping someone from taking over all the bitcoin addresses?

Anyone can generate unlimited bitcoin addresses. Presumably, there's a limited number of these (even if it's a very very large number). What's stopping someone from taking over all the bitcoin ...
13
votes
4answers
2k views

What is the Bitcoin equivalent of /dev/null?

Which canonical address is a legitimate address that nobody can claim?
13
votes
2answers
16k views

How to get all addresses - including the “change” addresses - from bitcoind?

I want to get all my addresses - including the auto-generated "change" addresses - from a running bitcoind somehow. I haven't been able to do it in a simple way. "getaddressesbyaccount" and all the ...
13
votes
1answer
5k views

How can I use the vanity name generator to look for an address?

How do you use the vanity name generator to look for an address? Is there an estimate on how long it takes to find addresses of varying lengths and complexities?
13
votes
1answer
813 views

What is the meaning of the Bitcoin address version?

Bitcoin address versions are described on the Address wiki page: Normal addresses currently always start with 1, though this might change in a future version. Testnet addresses usually start with m ...
13
votes
1answer
9k views

How to get a bitcoin address's balance?

I know blockchain.info has an API: https://blockchain.info/q/addressbalance/134dV6U7gQ6wCFbfHUz2CMh6Dth72oGpgH gets the bitcoin address's balance,but it's not open source and must connect to the ...
12
votes
5answers
937 views

How to instantly give people a pre-filled wallet to introduce them to Bitcoin?

As a Bitcoin evangelist I like to introduce Bitcoin to my friends, and if possible even get them involved by having them own a few coins themselves. The settlement of a personal debt through Bitcoin ...
12
votes
2answers
5k views

Why do all addresses begin with “1”? Why can't we just delete it?

The title is the question :) All the addresses I have seen - from the very first block http://blockexplorer.com/b/0 to the very last one http://blockexplorer.com/b/229850 all begin with "1". Why is ...
12
votes
2answers
2k views

What is the safest method managing a large number of receiving Bitcoin addresses?

Say I want to run a big project, where users can continually request new addresses to deposit Bitcoins in their online account. I suppose I will have to pre-generate thousands of Bitcoin key-pairs and ...
11
votes
3answers
6k views

How can I generate a large number of Bitcoin addresses?

I would like to generate a large number of public Bitcoin addresses (several hundred thousand) quickly and efficiently into a simple text file. What would be the easiest way to get this done? I'm just ...
11
votes
2answers
590 views

Is there a recommended maximum number of transactions any one address should ever receive?

The pool I am with has sent about twenty transactions to one address I gave as a 'send to' addy. Could this one address just go on and on taking more and more of these transactions? A hundred of them? ...
11
votes
2answers
93k views

Check how much money there is in my Bitcoin address/wallet

Is there a website or service that can quickly lookup how much bitcoins are there in a given wallet/address, so I can look up my own wallet from a friend's computer which doesn't have the Bitcoin ...
11
votes
5answers
3k views

What would happen if you send bitcoins to a non-existent Bitcoin address?

If one were to send bitcoins to an address that has not been created yet, what would happen? Would the coins be lost forever? Would they just sit there until the address and key pair are generated?
10
votes
4answers
17k views

How can I delete an address (private key) in the list of received Bitcoins?

For every transaction I wanted to get, I was creating a new address, but soon I realized that there is just no way to delete all these addresses from the UI. To make it clear, here is a picture: I ...
10
votes
3answers
703 views

How can I find out the address my payment will come from?

Can I find out the address I am going send from before making a payment? And could this be useful for merchants that want to identify my transaction?
10
votes
2answers
8k views

What are the minimum and maximum lengths of a Mainnet Bitcoin address?

I'm getting mixed answers on this question. For example, this source says addresses vary between 27 and 34 characters in length. The Wiki says 26-35 characters. Neither source cites something that ...
9
votes
5answers
3k views

Is “1Wh4bh” a valid Bitcoin address?

The bitcoin address 1Wh4bh looks so short. Is it even a valid address? If yes, can we send bitcoins to it?
9
votes
3answers
2k views

Why is P2PKH used instead of the simpler P2PK?

If elliptic curve cryptography is secure enough to be able to give away a public key without fear of anyone being able to calculate our private key from it, what's the reason for hashing our public ...
9
votes
1answer
10k views

Bitcoin Cash “Cash Address” format

What is "Cash Address" or "CashAddr"? Is that a new Bitcoin Cash address format?
9
votes
2answers
1k views

Why would we ever need 10k new addresses in average per day?

Generally speaking, the address space of Bitcoin seems to be sufficiently large to make it unlikely that a hash collision will ever occur (see below). Pacerier stated in a comment on Is it possible to ...
9
votes
4answers
20k views

How to move an address to a new wallet?

I have a wallet with several addresses. I would like to isolate one of the addresses in its own wallet, but I don't know how to do it. I've been trying with pywallet.py, but I've been unable to do it. ...