Questions tagged [client]

This tag should be used for questions regarding Bitcoin clients. A client is any application which allows a user to connect to the Bitcoin (or alternate) network. Alternately, "client" may refer to a non-standard user interface which interacts with the Bitcoin network through a standard client.

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42
votes
2answers
72k views

How can I export the private key for an address from the satoshi client?

If I want to transfer an address from the satoshi client into a different client, how can I find its private key to do so?
14
votes
2answers
9k views

I didn't receive a Bitcoin Payment. What does it mean when the Client is synchronizing?

Bitcoin newbie here. I recently installed the Bitcoin client, and purchased some bitcoins from Mt.Gox. My problem is that my client is constantly synchronizing. I've checked charts and seen that my ...
19
votes
4answers
20k views

How can I setup Bitcoin to be anonymous with Tor?

Bitcoin is billed as many things, among them its anonymity is highly regarded. While it is true that a transaction does not identify a user or wallet, recent news shows that there is the potential for ...
40
votes
4answers
70k views

Where is the data folder for Bitcoin-Qt?

Where can I find the blockchain, wallet.dat, etc. on each of the operating systems Bitcoin-Qt supports?
22
votes
5answers
42k views

Bitcoin-Qt setup: Change block-chain file location, settings? documentation?

I am installing Bitcoin-Qt and have been reading about Bitcoin basics, but I found very little information on the client. I have a few questions about the Bitcoin-Qt program (v0.8.1-beta under Windows ...
43
votes
2answers
7k views

What is the coin selection algorithm?

When creating a transaction in the standard client, what is the algorithm used to determine which unspent outputs will be used as inputs? Has this changed since the first version? What different ...
55
votes
2answers
44k views

What are bitcoin “confirmations”?

When I receive bitcoins I see a certain number of "confirmations" in the client. What do these mean? Why do most sites make me wait for 6 "confirmations" before a purchase will go through?
72
votes
2answers
34k views

What is an SPV client?

I've seen SPV client mentioned in several places. What exactly is a SPV client? How is it different from a standard client?
20
votes
9answers
4k views

What is a good resource to help newbies choose their first wallet/s?

While editing the Bitcoin Newb Guide, I realized I can't find a single page that covers all major clients in a Newb-friendly manner. bitcoin.org doesn't seem to mention web wallets such as My Wallet ...
32
votes
5answers
41k views

How to get an address's balance with the bitcoin client?

I want to see the balance of some address using bitcoind. I set txindex=1 and did a -reindex to get all transactions indexed. But still, there doesn't seem to be a way to get balances of an address. ...
30
votes
5answers
3k views

What would happen if a portion of the Bitcoin network was separated from the rest of the network?

Yesterday I asked a question over at SuperUser, so that I could have my facts straight before asking this question. The scenario sets the basis for this question. Regarding bitcoin, what would ...
14
votes
6answers
7k views

How to debug a long “0/unconfirmed” status in the bitcoin client?

When someone gets a status of "0/unconfirmed" on a transaction for a long time - what could he be doing wrong? What should he check to solve this?
44
votes
1answer
8k views

What do the different .dat files contain?

What data do different Bitcoin .dat files contain? How about the other files in the same folder? The wallet.dat file is somewhat documented and there are some ways to convert it to human-readable ...
36
votes
6answers
9k views

How do I reduce the size of the block chain data on my machine?

The block chain file is getting rather large, ~500MB. Is there a way to trim it or clean up, or maybe configure it to be limited in the future? I am using the stock Bitcoin client on Ubuntu.
16
votes
2answers
8k 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 ...
23
votes
2answers
12k views

Bitcoin URL scheme

What is the URL scheme that is used by Bitcoin to copy transaction information directly into the client? Which versions of Bitcoin clients support it?
13
votes
4answers
2k views

Does the original Bitcoin client scale to contain millions of addresses?

We use the standard client in our business. The wallet already contains about 25k addresses. Will the wallet remain stable after the number reaches 100k or a million addresses? I was told that all ...
7
votes
3answers
9k views

How can I export all my private keys using bitcoind?

I know that PyWallet has a -dumpwallet but without using pywallet, how can I export all the addresses and privatekeys with the stock bitcoind? Is there an API command that lists all addresses held by ...
29
votes
7answers
3k views

How can one download the bitcoin client securely?

What is the correct procedure to download the official bitcoin client, and validate it was signed by the developers, and not infected with any malware by a man in the middle?
21
votes
1answer
3k views

What does the Bitcoin client do when it receives conflicting transactions?

I've been assuming that the second transaction will simply be discarded as invalid, while the first waits at 0/unconfirmed until it actually gets into a block (requiring a "-rescan" or similar if the ...
11
votes
3answers
3k views

How to implement a game like SatoshiDice?

Everyone knows what SatoshiDice is. Their core mechanic is gambling through the use of Bitcoin transactions with the payout being directly linked to the transaction that fuelled the bed to avoid ...
20
votes
4answers
18k views

Moving the Bitcoin folder from AppData

Bitcoin's taking a lot of space on my C drive, and I would like to move it to another drive. I've figured out to do it using symbolic links, but the problem is that my Bitcoin client is currently ...
12
votes
1answer
5k views

How does one make multisignature transactions with the bitcoin client?

With the release of bitcoin version 0.6.1rc2, it is now possible to do M-of-N required signature transactions in the main network. But how does one actually perform such a transaction? I've been ...
10
votes
2answers
2k views

How secure are various models of Bitcoin clients?

As there was some disagreement on security of various models of Bitcoin clients in comments to this answer, I'd like to address the problem. How secure are various models of Bitcoin clients? Those ...
7
votes
3answers
7k views

How to know if a transaction is valid?

I understand there are a couple things that need to be checked for a transaction to be valid - the previous transaction had to be correct, no OP can invalidate the transaction, etc, but is there a ...
23
votes
8answers
3k views

Can I send bitcoins with my mobile phone?

Is it possible to send and receive bitcoins with a mobile phone? If so, are there bitcoin clients for Android or iOS?
0
votes
1answer
216 views

I think I was scammed [duplicate]

A few days earlier, a guy approached me claiming to mine bitcoins and multiplying my bitcoins 10 times. I invested with $700 and the blockchain wallet after 24 hours showed me $7000 worth bitcoins. ...
15
votes
3answers
8k views

Copy wallet to Electrum or Multibit?

Is there a way to import my wallet from Bitcoin.org's client into the much lighter Multibit or Electrum? The disk space & bandwidth consumption (not exactly well presented to a beginner) quickly ...
11
votes
2answers
1k views

Why is my client software not receiving bitcoins?

I've just installed the official bitcoin client for the first time on my PC and have visited a website that gives free bitcoins. I've been waiting for more than an hour, but the amount given to me is ...
-2
votes
1answer
297 views

“Needed Turnover” / “Missing Turnover” - How to get my money out?

Contact Information: contact@securitycrypto.info General information support: info@securitycrypto.info Support and online transaction search with full and detailed information: support@securitycrypto....
11
votes
2answers
3k views

How can Open Transactions benefit Bitcoin?

OT is being integrated into the Multibit client. How can such integration benefit users? What are some things it enables?
9
votes
1answer
5k views

How do Bitcoin nodes know where to send new transactions and blocks to?

I am researching Bitcoin; what I can't find much information on though is how the P2P network itself operates. For example, BitTorrent uses a DHT protocol that allows for node discovery and ...
23
votes
3answers
26k views

How to send bitcoin with a message attached

Is it possible to send bitcoins with an attached message with the transaction? If yes how to do it?
13
votes
1answer
10k 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 ...
8
votes
2answers
7k views

Is there a light (SPV) version of bitcoin core (bitcoind)?

I'm trying to develop an SPV Bitcoin client which makes use of a library requiring bitcoin core (a running bitcoind service). However, from what I understand, Bitcoin Core is full node, meaning that ...
13
votes
1answer
2k views

Is it possible to run more than one client instance on a machine?

Is it possible to run more than one Bitcoin client at the same time on the same machine? I tried to set different working ports, but it seems not to be working.
12
votes
1answer
3k views

Why doesn't Bitcoin use a DHT for choosing peers?

Why does Bitcoin use a gossip protocol rather than a DHT for peer discovery? I believe that kademlia XOR distance helps shape the network topology so that peers are more evenly disturbed.
2
votes
2answers
1k views

How trade engine works? [closed]

How cryptocoin trade engine works? Is there any open source project available other than buttercoin. I want to build a simple trade engine in ruby on rails for cryptocoins. what are the essential ...
19
votes
2answers
7k views

What happens if my transaction is not accepted because I did not pay fees?

I was reading this thread about a client fork that does not force transaction fees and I noticed the big red warning saying that some coins might get lost if I am not careful. What does this mean? ...
2
votes
1answer
7k 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?
5
votes
1answer
2k views

How to update Bitcoin client?

Today I downloaded and installed the new version of Bitcoin (0.5.0) I extracted the file and it created a folder. I followed the instructions and clicked bitcoin-qt.exe and the program started. No ...
4
votes
1answer
319 views

Is the alert system still in the main client's code? Will it be removed?

It is said that Satoshi removed the alert system from the client ... still, there are at least some leftovers in. Is the alert system functioning in 0.3.24? Are there plans to remove all traces of it?...
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?
8
votes
4answers
8k 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....
2
votes
1answer
270 views

Running multiple bitcoin instances on same server system

I wish to run multiple instances of bitcoind on my server to support highly read intensive RPC applications. Following links: how to run multiple bitcoind node on one server? Running Multiple Full ...
1
vote
1answer
2k views

bitcoin-qt keeps on quitting with “failed to read block”

I just wanted to install bitcoin-qt on another machine (all others are working fine) but I cannot seem to retrieve the block chain using bitcoin-qt 0.8.6-beta (as downloaded from http://sourceforge....
1
vote
1answer
1k views

Runaway exception on 0.9.3 Bitcoin client startup 64 bit Windows 7

After I install my Bitcoin client (0.9.3 64 bit on Win7) I can run it one time without problems. It won’t start up a second time, though, and terminate with the following error: EXCEPTION: ...
1
vote
1answer
405 views

GUIMiner stuck at 99% Done for over 1 hour

I have just started up my client GUIMiner for the first time. It was downloading the block chain without any issue and got up to 99% where it has been stuck for the past 1 to 1.5 hours. Is this ...
0
votes
1answer
1k views

Lost my wallet password. Is there anything I can do? [duplicate]

I lost my bitcoin wallet password, it was stored on a USB and I've lost the usb. Luckily I have a backup of my wallet. Are there any way possible I can get my coins back? Is there a bitcoin wallet ...
0
votes
1answer
389 views

How is bitcoin sent into my bank account?

I've been trying to find a way to transfer bitcoins from my bitcoin wallet into my bank account, I've gone to a couple sites that kinda use a similar method, but I don't really understand how it works....