Questions tagged [bitcoin-core]

This tag should be used for questions pertaining to Bitcoin Core. Bitcoin Core is an MIT-licensed Qt 5 GUI application for the original Bitcoin codebase. Additional/previous names include "Bitcoin-Qt", "Satoshi-Client", and "Standard Client". This tag should be used when referring to the Bitcoin Core software.

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1answer
644 views

mac bitcoin wallet question. Private keys?

I don't understand the bitcoin-qt program (mac). Why doesn't it show the private keys for the addresses I've created? Also, why doesn't it let me delete the new addresses? Say I want to send money ...
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4answers
1k views

Is pruning transaction history implemented in Satoshi's bitcoin client?

The original bitcoin paper suggests a method to discard old transactions. One should compute the Merkle Tree of the entire transaction history, and store only part of the tree. However, I didn't ...
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4answers
7k views

What can I do when the blockchain synchronization is stuck at a specific block?

I hadn't started/used my Bitcoin client for ages. Now, whenever I start the client, it is downloading block 135407 and does not progress past it. What can I do?
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2answers
3k views

Why does the initial blockchain download get stuck part way through?

I am trying to get Bitcoin up and running on a fairly underpowered laptop and Windows Vista using Bitcoin-Qt 0.5.0.1. After installing and starting the program, I am stuck at at the syncing stage at ...
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0answers
455 views

Move all coins from an address via RPC

Let's say I generated some coins with a given address and I want to send a specific amount of coins to a specific addresses, and move the remaining balance to another specific address. I want to do it ...
5
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3answers
308 views

What is the current (Feb 2012) “bus factor” of the standard client?

Bus Factor (Youtube) is the total number of key developers who would need to be incapacitated (as by getting hit by a bus) to send the project into such disarray that it would not be able to ...
3
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3answers
315 views

Address creation in standard client - random library?

Is the random library used by the standard client in any way deterministic, or can one count on it being truly random? For example, often random libraries are initialized with seed value of the ...
2
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2answers
156 views

Which Bitcoin developers are referred to as saying that “users have no say in the system's core development”

Genjix wrote about this in two recent posts. Here's one. Some developers argue that with the issues being highly complex, that users have no say in the system’s core development And the other: ...
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3answers
2k views

Why are m-of-n transactions not used today?

BIP 11 supports m-of-n transactions. While BIP 16 and BIP 17 are being debated and voted upon, I have to ask: why haven't there been evidence of BIP 11 used in for m-of-n transactions? All that BIP ...
5
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2answers
156 views

Can the blockchain be included in future packages of the standard client?

Is it possible to include actual transaction history to new version of Bitcoin client? I mean, when someone new downloads a fresh version from http://bitcoin.org. It is very hard to get more people ...
6
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1answer
428 views

What happens when an encrypted wallet runs out of keys?

Say someone wanted to be evil to the main client and set its wallet to contain one key, lock it, and then start mining. After the first block was generated, the client would traditionally create a new ...
4
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1answer
222 views

Can one send bitcoind transactions that will only be valid after a certain amount of time?

The standard client only allows one to spend coins from a transaction after getting 6 confirmations (120 in case of mining rewards). Can one send bitcoind a JSON-RPC command telling it to send those ...
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2answers
615 views

Is it possible to give a public read only access to a Bitcoin account?

Is it possible to give a public read only access to a Bitcoin account using the Bitcoin client? For example if for an non-profit organisation it can be useful to have read only access to it's Bitcoin ...
3
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1answer
1k views

What is bitcoind.pid?

The file bitcoind.pid is mentioned on "Running Bitcoin" wiki page, but it's not explained on the wiki. What does that file do?
2
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1answer
1k views

Bitcoin RPC SSL error

I recently tried running Bitcoin-QT as a server with SSL enabled, but when I was testing the connection, with this command: openssl s_client -connect 111.11.111.111:8332 I got this error: CONNECTED(...
4
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1answer
206 views

What .dat files are safe to be accessed while the Bitcoin client is running?

Sometimes one wants to backup some .dat files from Bitcoin, but one can't shut down the client to do so (for example, if one is running a pool). Which .dat files are safe to be copied when the client ...
4
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1answer
205 views

API calls - “not yet implemented”?

I tried sending some commands to my Bitcoin-QT running on Mac, and when I called "encryptwallet", I got this response: Not Yet Implemented: use GUI to encrypt wallet, not RPC command What API calls ...
4
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1answer
143 views

Is two-phase encryption planned for the standard client?

Currently, the standard client supports encryption, but only for actions that change its state (send money, generate address). I would like the client to require two passwords - one to view any ...
3
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3answers
1k views

How do I know my wallet.dat actually already contains 100+ addresses ready to be used?

I'm using the standard commandline client (under OSX, in case this matters). I've read in some threads that it is smart enough to pregenerate 100+ addresses to be used in future when you ask them, so ...
8
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1answer
7k views

Installing Bitcoin-Qt on Ubuntu

I am using Ubuntu 11.10. I have downloaded Bitcoin-Qt, but I don't think it has installed itself. The instructions say "download and install" the software, but I'm afraid I need instructions that are ...
2
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1answer
769 views

P2Pool - I get only rejects

I started mining with P2Pool / cgminer. bitcoin-qt.exe is running. run_p2pool.exe is running. cgminer is running. But all I get are rejects. What might be the problem?
3
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4answers
2k views

Can I configure Bitcoin (Linux) with a custom wallet location?

The default setup on Linux/Ubuntu has Bitcoin storing the data in the ~/.bitcoin folder, which is usually not encrypted with TrueCrypt. Suppose I do now want to rely on the internal Bitcoin ...
24
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2answers
12k views

Bitcoin-Qt command line control on Mac

I'm trying to communicate with the new Bitcoin-Qt -server via a command line on Mac. I run ./Bitcoin-Qt -server, the application starts, but my terminal window is stuck on an empty line (no matter ...
16
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2answers
11k views

ECDSA r, s encoding as a signature

An ECDSA algorithm when signing a given messages produces a pair of outputs, r and s. How, given a sigStr from a Tx can one extract r and s? Are they just concatenated byte arrays of a specific length,...
6
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2answers
5k views

How can I copy the blockchain from my working client for use with a live CD savings wallet?

I have the Bitcoin client installed on my Windows PC, but I want to set up a savings wallet with better security that I access with an Ubuntu live CD. I don't want to have to download the entire ...
5
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1answer
977 views

Script - OP_PUSHDATAs

When using OP_PUSHDATAs in different Scripts, how are the next bytes denoting the amount of bytes to be pushed encoded? Are they to be treated as unsigned integer, or signed (like the data that is ...
13
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2answers
6k views

How can I import a private key into the Bitcoin client? [duplicate]

I have a private key and I want to add it to the keys in the Bitcoin client. Is there an easy way to do this?
8
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3answers
914 views

(Why) is it difficult to merge and split wallet.dat?

It is a common question, how to sync a wallet across different devices. As far as I understand, a wallet is just a collection of private keys. Each private key can be uniquely identified using the ...
11
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3answers
6k views

Bitcoin client won't connect to the network

I installed Bitcoin QT yesterday and it was very slow to connect to the network. It didn't actually get there for over an hour. Today I opened it again and it won't connect to the network at all. Any ...
6
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1answer
216 views

Is there still a shortage of available inbound connection slots?

David Schwartz's answer to this question states the following: "For some reason that isn't well-understood, the Bitcoin peer-to-peer network is consistently short of available inbound connection ...
9
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1answer
1k views

Does the main Bitcoin client blacklist addresses?

Does the main Bitcoin client blacklist any addresses that send too many erroneous messages? If so, how can one whitelist a particular address? I am developing an app that will be communicating with ...
5
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1answer
874 views

Version field in transactions, blocks, etc

A field labelled "version" appears in many contexts regarding the Bitcoin protocol. Sometimes one uses the current version of the Bitcoin client (version message), sometimes 1 is used (block, tx), why ...
18
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4answers
5k views

Why does the Bitcoin protocol use the little-endian notation?

Why does the Bitcoin use the litte-endian notation? It is less common than big-endian notation, thus when programming low-level applications working with Bitcoin protocol, one quite often has to ...
4
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3answers
458 views

Running two bitcoind instances for different nets

Is it possible to run two separate bitcoind instances on one system at the same time, one for mainnet, other for testnet?
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2answers
170 views

Bitcoin client incentives to share peers and blockchain

Question a bit related to Microsoft's research on incentives of sharing transactions. What is the incentive for a custom-tailored Bitcoin client to share information regarding known clients and the ...
7
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1answer
3k views

Running Bitcoin on command-line-only system

I want to run a Bitcoin client on a command-line-only system (Amazon EC2). Is there some specific command-line parameters I should use in order to run the main client without the GUI, or will it run ...
5
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3answers
3k views

Does my client accept inbound connections?

How can I verify that the Bitcoin client is well connected to the network and is able to receive incoming connections?
10
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3answers
1k views

Why does the mainline client limit the number of outbound connections to 8?

The mainline Bitcoin client limits number of outbound connections to 8 however allows up to 125 total connections. To achieve greater than 8 connections (due to outbound limitation) requires either ...
5
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2answers
5k views

What does the `gen` option in bitcoin.conf do?

The gen option isnt copiously described in the sample bitcoin.conf file ... does that mean that the daemon started up will attempt to mine for coins?
8
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3answers
9k views

Why does it take 15 minutes for my Bitcoin client to start?

I use Ubuntu 11.10 and have recently installed the standard Bitcoin client 0.40. But the GUI only appear around 15 minutes after started. My machine is an AMD64 Athlon 4600x2 with 6GB RAM. Is this ...
18
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2answers
3k views

Why was the MIT license chosen for Bitcoin?

Given that an open, transparent, distributed p2p network is a central element of Bitcoin project it seems unusual that it is licensed under the MIT license which allows proprietary closed source ...
5
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2answers
1k views

Bitcoin client two-way communication

When client A opens a connection to client B, it opens its TCP connection to second client's port 8333. Is this connection solely used for A's queries and B's answers to A's query, or can B also query ...
5
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1answer
430 views

Bitcoin initial communication diagram

I'm trying to understand how exactly does the Bitcoin client communicate initially with another client, as I'm making my own client and learning new things about TCP protocol. As I understand, the ...
9
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2answers
5k views

Does the Bitcoin client generate bitcoins automatically?

I mean, you just need to install the software, and with the time, you will get lots of bitcoins?
3
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1answer
80 views

Bitcoin client communication time constraints

How long does the standard Bitcoin client wait between sending a message to another client and deciding that the client is not responding? That is, if someone makes a client that takes a couple ...
5
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2answers
4k views

Internet speed required to run the Bitcoin client

What is the rough estimate of internet speed needed to run the standard client? Does a faster Internet connection increase the client performance (by that I mean how fast it updates its blockchain, ...
14
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5answers
651 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 ...
17
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2answers
6k views

How does the Bitcoin client encrypt the wallet.dat file?

What is the algorithm used for encrypting the wallet.dat file?
4
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1answer
521 views

When will the official client support partial blockchain downloads?

Are there concrete plans for the official client to be able to download just a portion of the blockchain? By concrete I mean what's the issue tracking this on github, is there a planned version for ...
3
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3answers
845 views

Bitcoin communication with non-standard ports

I'm writing a Bitcoin web app that is to be deployed on an external server over which I have no control. I probably won't have access to standard Bitcoin port (8333). Will this cause a problem when ...