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 ...
8
votes
2answers
20k views

Bitcoin Cash accidentally sent to Bitcoin address. Can I get them back? [duplicate]

I managed my Bitcoins Cash in a Electrum Cash wallet on my PC. From there, I accidentally sent them to another internet based wallet, but didn't notice that this wallet is for Bitcoin and not Bitcoin ...
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?
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 ...
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?
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.
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 ...
5
votes
2answers
2k views

How are compressed PubKeys generated?

Just read this: https://bitcoin.stackexchange.com/a/1715/ What is the process to generate compressed pub keys via ECDSA?
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 ...
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 ...
6
votes
2answers
13k views

What happens if you send Bitcoin to a Litecoin address?

Is it lost forever? What about the reverse: sending Litecoin to a Bitcoin address?
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 ...
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 ...
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 ...
13
votes
4answers
2k views

What is the Bitcoin equivalent of /dev/null?

Which canonical address is a legitimate address that nobody can claim?
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 ...
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?
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?
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 ...
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 ...
9
votes
3answers
2k views

What is the difference between accounts and adresses?

What is the difference between accounts and adresses? As discussed in this question accounts are a component of bitcoin wallets, different from addresses. What are they? How do they work?
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 ...
8
votes
2answers
2k views

How to get balance from a specific address in bitcoinj?

I'm trying to get the balance of a specific address in a wallet by using bitcoinj, but I don't know how. Can someone help me? Thanks in advance!!
4
votes
2answers
1k views

How to get the Input Address from vin where only a txid is given (Insight-Api)

I like to find the Input Address and Amount for a vin like this: "vin": [ { "txid": "e3f0e88ce224d342a0189c1b9d2fd488d8bda2f303dbe1e1dbbaa5f51d9f4a53", "vout": 1, "...
9
votes
1answer
2k views

Wallets vs Addresses

I dont understand how a wallet comes into play? Is a wallet a necessary part of a transaction or is it just a way of collating multiple addresses? I get how I should use a new address for each ...
4
votes
2answers
594 views

Does the satoshi client always send the change of a transaction to a newely generated address?

Experimentally, this seems to be the case, but is it always like this or depends on some details? Also, does it generate a new address each time this is done, or first searches the wallet if there is ...
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?
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 ...
9
votes
2answers
2k views

How to get addresses from scriptPubKey in segwit transactions?

I'm running through raw transaction data, and I'd like to be able to gather addresses (where possible). So far, I've made this diagram to help me understand when it's possible to figure out addresses ...
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 ...
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 ...
7
votes
3answers
4k views

How can I test if a bitcoin address is compressed or not?

I have two bitcoin addresses: 1D8VSXHFAWNhAbruwUMbNp4hsXAnRNkYvX 12T15tvMGaymMX97X9KxVzyLF323r8v6Hg One is compressed, one is not. How can I test which is which? (Preferably using python 2.7) ...
5
votes
3answers
6k views

How to pre-generate 100M bitcoin addresses? [duplicate]

What is the best method to generate large numbers of bitcoin addresses? I imagine something like the following would break bitcoind in some fashion: ./bitcoind keypool=100000000
5
votes
3answers
6k views

Sending and receiving address

What's the difference between sending and receiving address? I mean, if for mistake I asked to send a payment to my sending address, have I lost my bitcoin? TX
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 ...
9
votes
1answer
10k views

Bitcoin Cash “Cash Address” format

What is "Cash Address" or "CashAddr"? Is that a new Bitcoin Cash address format?
7
votes
2answers
2k views

If SHA256 and/or RIPEMD-160 were broken, would all bitcoin addresses be compromised?

If not, what else would be needed to steal all funds from all people and completely break bitcoin? I bet some will say ECSDA gives bitcoin an additional layer of protection. I counter this by saying ...
6
votes
2answers
2k views

Why is it impossible to derive public key from address?

This is my first bitcoin transaction. Why this transaction doesn't show my public key? help message on the same page says that, It's impossible to determine the public key from a Bitcoin address, ...
6
votes
1answer
914 views

How to handle a ridiculous amount of receiving addresses?

By ridiculous I mean something absolutely absurd. 1 million+ addresses. Like say if Amazon had started to accept payments, how could they possibly keep up? Bitcoind probably can't keep up? How would I ...
5
votes
1answer
3k views

Electrum addresses start with “b”

As far as I know, all bitcoin addresses start with a "1" or "3" prefix. I've just started using electrum wallet and all the addresses it generated had a prefix of "b", or even "bc". Is this legit or ...
4
votes
2answers
2k views

How does blockchain.info associate a message with an address? [duplicate]

I randomly encountered this address on blockchain.info: https://blockchain.info/address/1CzpppydnGN5dQN7iBnZbmm5RXreu7hrHW and at the top a message appears presumably describing the owner of the ...
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 ...
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?
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 ...
8
votes
4answers
7k views

How to find a specific bitcoin address from all the addresses?

Recently, I found a site that show all the addresses in a huge list, divided in 904625697166532776746648320380374280100293470930272690489102837043110636675 pages. The site's link is http://directory....
5
votes
4answers
2k views

Is vanitygen a problem for bitcoin?

Considering the amount of users of vanitygen, and the fact that each user is generating millions/billions of bitcoin addresses, won't we run out of bitcoin addresses soon? What would happen if we did ...
5
votes
4answers
3k views

Can each Bitcoin and Satoshi be uniquely identified?

I'm pretty sure I've read somewhere that BitCoins have an "address", so they can be uniquely identified. What I want to know is: Does each Satoshi have it's own unique identity? How is the identity ...
5
votes
1answer
725 views

Can I send bitcoin to other address in my wallet to provide anonymity?

I want to buy service Z. I have 2 addresses in my bitcoin wallet: aaa and bbb. I buy 1 bitcoin from coinbase and tell coinbase to send them to aaa. Now I send them from aaa to bbb. No one else ...
3
votes
1answer
4k views

What is the maximum of receive addresses the default wallet can handle?

I guess there is no limit. But on tests, what is the maximum before the bitcoind start to slow down in a specific machine?
2
votes
1answer
906 views

Need sample compressed and uncompressed Public / Private key pairs for BigInteger

I am testing a different version of BigInteger that has different endian formats and the native implementation likes to add or remove zeros from the final output. Can anyone provide some sample ...