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Bitcoin-qt Documentation

Bitcoin-qt Should Have A Way To Choose Blockchain Save Location By Now... : Bitcoin

Bitcoin-qt Should Have A Way To Choose Blockchain Save Location By Now... : Bitcoin

Do not use URL shortening services: always submit the real link. Begging/asking for bitcoins is absolutely not allowed, no matter how badly you need the bitcoins. Only requests for donations to large, recognized charities are allowed, and only if there is good reason to believe that the person accepting bitcoins on behalf of the charity is trustworthy. News articles that do not contain the word "Bitcoin" are usually off-topic. This subreddit is not about general financial news. Submissions that are mostly about some other cryptocurrency belong elsewhere. For example, /r/CryptoCurrency is a good place to discuss all cryptocurrencies. Promotion of client software which attempts to alter the Bitcoin protocol without overwhelming consensus is not permitted. Trades should usually not be advertised here. For example, submissions like "Buying 100 BTC" or "Selling my computer for bitcoins" do not belong here. /r/Bitcoin is primarily for news and discussion. Please avoid repetition /r/bitcoin is a subreddit devoted to new information and discussion about Bitcoin and its ecosystem. New merchants are welcome to announce their services for Bitcoin, but after those have been announced they are no longer news and should not be re-posted. Aside from new merchant announcements, those interested in advertising to our audience should consider Reddit's self-serve advertising system . Do not post your Bitcoin address unless someone explicitly asks you to. Be aware that Twitter, etc. is full of impersonation. Continue reading >>

Cryptopia - Forum

Cryptopia - Forum

If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer (on Windows) or just copy over/Applications/Bitcoin-Qt(on Mac) orbitcoind/bitcoin-qt(on Linux). The first time you run version 0.15.0 or newer, your chainstate database will be converted to a new format, which will take anywhere from a few minutes to half an hour, depending on the speed of your machine. Note that the block database format also changed in version 0.8.0 and there is no automatic upgrade code from before version 0.8 to version 0.15.0 or higher. Upgrading directly from 0.7.x and earlier without re-downloading the blockchain is not supported. However, as usual, old wallet versions are still supported. Wallets created in 0.16 and later are not compatible with versions prior to 0.16 and will not work if you try to use newly created wallets in older versions. Existing wallets that were created with older versions are not affected by this. Bitcoin Core is extensively tested on multiple operating systems using the Linux kernel, macOS 10.8+, and Windows Vista and later. Windows XP is not supported. Bitcoin Core should also work on most other Unix-like systems but is not frequently tested on them. Bitcoin Core 0.16.0 introduces full support for segwit in the wallet and user interfaces. A new-addresstypeargument has been added, which supportslegacy,p2sh-segwit(default), andbech32addresses. It controls what kind of addresses are produced bygetnewaddress,getaccountaddress, andcreatemultisigaddress. A-changetypeargument has also been added, with the same options, and by default equal to-addresstype, to control which kind of change is used. A newaddress_typeparameter has been added to thegetnewaddressandad Continue reading >>

Bitcoin-qt (a.k.a Bitcoin Core)

Bitcoin-qt (a.k.a Bitcoin Core)

You are at: Home Bitcoin-Qt (a.k.a Bitcoin Core) Open-source full Bitcoin client software that utilizes the Qt UI framework for a graphical user interface. Wladimir J. van der Laan developed the software to use the original reference code by Satoshi Nakamoto , but with an improved user interface. Today, it is bundled with the Bitcoin Core client and is collectively maintained by the Bitcoin core developers (who are paid by the Bitcoin Foundation) as well a large community of developers across the world . Bitcoin-Qt can be downloaded from bitcoin.org and the source code can viewed and contributed to on github.com . As of version 0.9.0, Bitcoin-Qt was rebranded to Bitcoin Core due to the progress made in separating the client code from the graphical interface. Since the technical specifications of the Bitcoin protocol have not been completely documented, the Bitcoin Core code is considered to be the reference client that defines the Bitcoin protocol. Other Bitcoin clients typically attempt to match its behavior (including any bugs) as to avoid protocol inconsistencies and avoid a hard fork in the blockchain for their users. Know more than 99% of the population about Bitcoin. One email aday for 7 days, short and educational (guaranteed). The best Bitcoin exchange based on your location is... Post your question in our Q&A section and I'll do my best to respond within 24 hours. Continue reading >>

Developer Reference - Bitcoin

Developer Reference - Bitcoin

BETA: This documentation has not been extensively reviewed by Bitcoin experts and so likely contains numerous errors. Please use the Issue and Edit links on the bottom left menu to help us improve. Click here to close this disclaimer. X The Developer Reference aims to provide technical details and API informationto help you start building Bitcoin-based applications, but it is not aspecification . To make the best use ofthis documentation, you may want to install the current version of BitcoinCore, either from source or from a pre-compiled executable . Questions about Bitcoin development are best asked in one of the Bitcoin development communities .Errors or suggestions related todocumentation on Bitcoin.org can be submitted as an issue or posted to the bitcoin-documentation mailing list . In the following documentation, some strings have been shortened or wrapped: []indicates extra data was removed, and lines ending in a single backslash \are continued below. If you hover your mouse over a paragraph, cross-referencelinks will be shown in blue. If you hover over a cross-reference link, a briefdefinition of the term will be displayed in a tooltip. The Bitcoin.org Developer Documentation describes how Bitcoin works tohelp educate new Bitcoin developers, but it is not a specificationandit never will be. Bitcoin security depends on consensus . Should your program diverge from consensus , its security is weakened or destroyed. The cause of thedivergence doesnt matter: it could be a bug in your program, it couldbe an error in this documentation which youimplemented as described, or it could be you do everything right butother software on the network behaves unexpectedly . The specific cause will not matter to the users of your softwarewhose wealth is lost. The only correct sp Continue reading >>

Bitcoin-qt Setup: Change Block-chain File Location, Settings? Documentation?

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 7), Where is the complete Bitcoin-Qt documentation? I can not find it. How do I change the file locations for the block-chain storage? The default appears to be MyDocuments\AppData\Roaming\ My C: system drive is small, and I have a second drive for such data. Is the "Wallet" a separate file/entity from the block-chain? Can I backup the wallet by simple copy/paste/tar.gz without carrying the entire block-chain? Does the Bitcoin-Qt client currently have built-in mining/transaction-processing? I do not see the dialog-box to configure. I have a graphics card and ample wasted CPU-cycles. Thanks for clarification. Links to proper documentation are welcome! Where is the folder in Windows 8.1? He is not under AppData \ Roaming user17072 Jun 4 '14 at 9:31 Right-click on your bitcoin-qt shortcut, press properties, and add -datadir=D:\Bitcoin Go make that directory, then run bitcoin. If a bunch of files show up in there, you've done it correctly. Did the same. Unless I did something wrong, it doesn't seem to work. Chiffa Dec 2 '13 at 0:45 What is the full datadir syntax, windows returns the error of: "The name of C:\[Path To]\Bitcoin-qt.exe-datadir=E:\Bitcoin_Wallet specified in the Target box is not valid. Make sure the path and file name are correct"? GiantCowFilms Oct 26 '14 at 16:58 @GiantCowFilms There's supposed to be a space between exe and -datadir. Nick ODell Oct 26 '14 at 17:01 Fixied!(Thanks @NickODell) for any one who is curious, here is the full syntax:C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe" -datadir=e:\Bitcoin_Wallet GiantCowFilms Oct 26 '14 at 17:03 I don't hav Continue reading >>

Wladimir Van Der Laan's Top Four Priorities For Bitcoin

Wladimir Van Der Laan's Top Four Priorities For Bitcoin

Wladimir van der Laan's Top Four Priorities for Bitcoin Bitcoin has a new lead developer , Wladimir van der Laan, and with the ecosystem growing every day he is going to have a lot on his hands over the next year. We asked Van der Laan what major issues affecting the bitcoin core are on his radar. Here are his four main priorities: 1. Splitting off the Bitcoin-Qt wallet from the P2P core code At the moment, the core functions of the bitcoin client, processing new transactions and maintaining the history of old transactions, share the space as information about the wallet you set up using the client. When you download Bitcoin-Qt, the official bitcoin software, you can help maintain the bitcoin network (i.e. run a node) and run a wallet (i.e. hold your money) from within the same program. Back in the day when people did not know what bitcoin was, [this] made sense, explained Van der Laan. One would install one program to maintain the network and to be able to receive and send those curious coins. This creates the risk of someone stealing the private key to your wallet and therefore your money. When you unlock your private keys in order to spend money, their plaintext form is exposed to the wider bitcoin network. This arises because of a difference in function, Van der Laan said. There is an inherent conflict: because of security risks it is sensible for a wallet to be online as little as possible, whereas a node should be online as much as possible for a stable P2P network. Separating these two functions will turn Bitcoin-Qt into a simple payment wallet (i.e. a simple piece of software for running a bitcoin wallet), which will then run the core bitcoin software optionally and separately in the background thus keeping your bitcoin wallet safe, while also letting you contr Continue reading >>

Compiling Bitcoin-qt In Windows 7

Compiling Bitcoin-qt In Windows 7

I've been flailing around and failing a lot, so I thought I'd start a thread and see if others have had any more luck. BTW, how do I make the following list automatically numbered so steps are easily referenced? I inserted the numbers after I finished the post. 1.I installed MinGW following the instructions at . 2.I downloaded the QT libraries for Windows from (which is referred to, on that page, as "The QT SDK") and moved them into the MinGW directory as described the readme-qt.rst file in bitcoin-qt's doc directory. 3.I downloaded QT Creator (it wasn't installed as part of the SDK as implied by the info on the QT Libraries page) and installed it. 4.I ran QT Creator and opened the bitcoin-qt.pro file in it, and it said "Bitcoin-QT is not configured..." and "No valid version of QT..." something or other, which I fixed by following the instructions that accompanied the error, selecting qmake.exe from C:\Qt\4.8.3\bin 5.QT Creator said I had to add a toolchain, so I added MinGW by selecting g++.exe from C:\MinGW\bin. I discovered that I had to then close and re-open QT Creator to make the "Bitcoin-QT is not configured..." message go away. 6.I had mistakenly put the qtgui_deps in the lib and include directories under MinGW, so I recopied the include and lib directories into C:\Qt\4.8.3, which I think is what "Copy the contents of the folder "deps" to "X:\\QtSDK\\mingw", replace X:\\ with the location where you installed the Qt SDK" means. But that instruction insinuates that the QT SDK contains a folder called mingw which it does not. 7.When I try to build, QT Creator says ":-1: error: No rule to make target 'c:/Documents and Settings/dscotese/bitcoin-qt-build-desktop-Qt_4_8_3__4_8_3__Debug/build/build.h', needed by 'debug/bitcoin-qt.exe'. Stop." 8.I still get "No Rule to Continue reading >>

Running Bitcoin - Bitcoin Wiki

Running Bitcoin - Bitcoin Wiki

There are two variations of the original bitcoin program available; one with a graphical user interface (usually referred to as just Bitcoin), and a 'headless' version (called bitcoind ). They are completely compatible with each other, and take the same command-line arguments, read the same configuration file, and read and write the same data files. You can run one copy of either Bitcoin or bitcoind on your system at a time (if you accidently try to launch another, the copy will let you know that Bitcoin or bitcoind is already running and will exit). The simplest way to start from scratch with the command line client, automatically syncing blockchain and creating a wallet, is to just run this command (without arguments) from the directory containing your bitcoind binary: These commands are accurate as of Bitcoin Core version v0.14.0. Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message) Execute command when the best block changes (%s in cmd is replaced by block hash) If this block is in the chain assume that it and its ancestors are valid and potentially skip their script verification (0 to verify all, default: 00000000000000000013176bf8d7dfeab4e1db31dc93bc311b436e82ab226b90, testnet: 00000000000128796ee387cf110ccb9d2f36cffaf7f73079c995377c65ac0dcc) Specify configuration file (default: bitcoin.conf) Set database cache size in megabytes (4 to 16384, default: 300) Imports blocks from external blk000??.dat file on startup Keep at most unconnectable transactions in memory (default: 100) Keep the transaction memory pool below megabytes (default: 300) Do not keep transactions in the mempool longer than hours (default: 336) Extra transactions to keep in memory for compact block reconstructions (default: 1 Continue reading >>

Data Directory. All About Cryptocurrency - Bitcoin Wiki

Data Directory. All About Cryptocurrency - Bitcoin Wiki

The database files in the "blocks" and "chainstate" directories are cross-platform, and can be copied between different installations. These files, known collectively as a node 's "block database", represent all of the information downloaded by a node during the syncing process. In other words, if you copy installation A's block database into installation B, installation B will then have the same syncing percentage as installation A. This is usually far faster than doing the normal initial sync over again. However, when you copy someone's database in this way, you are trusting them absolutely. Bitcoin Core treats its block database files as 100% accurate and trustworthy, whereas during the normal initial sync it treats each block offered by a peer as invalid until proven otherwise. If an attacker is able to modify your block database files, then they can do all sorts of evil things which could cause you to lose bitcoins. Therefore, you should only copy block databases from Bitcoin installations under your personal control, and only over a secure connection. Each node has a unique block database, and all of the files are highly connected. So if you copy just a few files from one installation's "blocks" or "chainstate" directories into another installation, this will almost certainly cause the second node to crash or get stuck at some random point in the future. If you want to copy a block database from one installation to another, you have to delete the old database and copy all of the files at once. Both nodes have to be shut down while copying. Only the file with the highest number in the "blocks" directory is ever written to. The earlier files will never change . Also, when these blk*.dat files are accessed, they are usually accessed in a highly sequential manner. Th Continue reading >>

Get Help - Bitcoin Core

Get Help - Bitcoin Core

There are many ways to get help for Bitcoin Core, including documentation , forums , and live chatrooms . To report an issue,please see the bug reporting page. Bitcoin Core currently doesnt have any cohesive or completedocumentationbut we hope to improve that situation soon. For now, youcan use the following resources: Bitcoin Wiki pages: running Bitcoin , datadirectory , and other articles in the BitcoinCore documentation category . The developer reference provides complete documentation of theRPCs that can be used with bitcoin-cli or in third-party programs.The REST interface is also fully documented. Both can be searchedusing the box below: The bandwidth sharing guide describes installing Bitcoin Core indetail as well as opening port 8333 to allow other Bitcoin programs todownload blocks and transactions from you. Bitcoin has a wide range of communities , but the following placesare the best place to ask for help using Bitcoin Core: Bitcoin StackExchange is a community dedicated entirely toanswering questions about Bitcoin and related technology. Manyquestions about Bitcoin Core can be found under the Bitcoin-Qttag BitcoinTalk Technical Support is asub-forum dedicated to providing help for Bitcoin Core and otherBitcoin programs. /r/BitcoinBeginners is a Reddit community forusers who have questions about anything Bitcoin-related, includingBitcoin Core. Internet Relay Chat (IRC) is the most popular way to get live onlinehelp with Bitcoin Core. When you join an IRC chatroom, you must readthe topic (which is usually automatically displayed) to learn the rulesfor that chatroom. #bitcoin is the best place to ask general questions aboutBitcoin Core. #bitcoin-mining hosts discussion about Bitcoin mining, includingdecentralized mining using Bitcoin Core as part of the system Continue reading >>

5 Steps To Install Bitcoin-qt Faster - Bitcoin-en.com

5 Steps To Install Bitcoin-qt Faster - Bitcoin-en.com

5 Steps to Install and Set Up Bitcoin-Qt (now Bitcoin Core) Faster As of Bitcoin Core version (formerly Bitcoin-Qt) 0.10.0 and later, the block chain bootstrap torrent is *slower* than a direct download using the bitcoin P2P protocol & client. If you want the torrent for other reasons, please visit: To download the latest version of Bitcoin Core, please visit: Since release v0.14.0 , Bitcoin Core furtherimproves on validation speed and network propagation performance, supports pruning the blockchain, leading to much shorter sync and initial block download times. The biggest pain point of using Bitcoin-Qt( Bitcoin Core )prior to v 0.10as your wallet is it takes forever to sync to get the complete block chain. A fully functioning node must have the Bitcoin-Qt ( Bitcoin Core ) client on a machine instance with the complete block chain.Note that this speed-up tip will no longer be necessary for Bitcoin Core version 0.10 (click here for Bitcoin Core version history) and above because blockchain syncing will be parallelized across multiple peers and and will be faster than the approach mentioned here. Please make sure the software is running from a computer with SSD (solid state drive), not HDD (hard drive) as the disk-intensive operations will be slow to death if you're not using SSD when you launch Bitcoin-Qt for the first time. Applicable to Bitcoin Core prior to v 0.10, this article is a how-to guide about setting up a full bitcoin node by installing Bitcoin-Qt (now a.k.a. Bitcoin Core) on a Mac using slightly faster approaches broken down as follows: Give higher CPU priority to Bitcoin-Qt process Wait for Bitcoin-Qt catch up synchronization Since version 0.9, Bitcoin-Qt was renamed to Bitcoin Core to reduce confusion between Bitcoin-the-network and Bitcoin-the-software. Continue reading >>

Bitcoin-qt Setup: Change Block-chain File Location, Settings? Documentation?

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 7), Where is the complete Bitcoin-Qt documentation? I can not find it. How do I change the file locations for the block-chain storage? The default appears to be MyDocuments\AppData\Roaming\ My C: system drive is small, and I have a second drive for such data. Is the "Wallet" a separate file/entity from the block-chain? Can I backup the wallet by simple copy/paste/tar.gz without carrying the entire block-chain? Does the Bitcoin-Qt client currently have built-in mining/transaction-processing? I do not see the dialog-box to configure. I have a graphics card and ample wasted CPU-cycles. Thanks for clarification. Links to proper documentation are welcome! Where is the folder in Windows 8.1? He is not under AppData \ Roaming user17072 Jun 4 '14 at 9:31 Right-click on your bitcoin-qt shortcut, press properties, and add -datadir=D:\Bitcoin Go make that directory, then run bitcoin. If a bunch of files show up in there, you've done it correctly. Did the same. Unless I did something wrong, it doesn't seem to work. Chiffa Dec 2 '13 at 0:45 What is the full datadir syntax, windows returns the error of: "The name of C:\[Path To]\Bitcoin-qt.exe-datadir=E:\Bitcoin_Wallet specified in the Target box is not valid. Make sure the path and file name are correct"? GiantCowFilms Oct 26 '14 at 16:58 @GiantCowFilms There's supposed to be a space between exe and -datadir. Nick ODell Oct 26 '14 at 17:01 Fixied!(Thanks @NickODell) for any one who is curious, here is the full syntax:C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe" -datadir=e:\Bitcoin_Wallet GiantCowFilms Oct 26 '14 at 17:03 I don't hav Continue reading >>

Data Directory - Bitcoin Wiki

Data Directory - Bitcoin Wiki

The data directory is the location where Bitcoin's data files are stored, including the wallet data file. Go to Start -> Run (or press WinKey+R) and run this: Bitcoin's data folder will open. For most users, this is the following locations: C:\Documents and Settings\YourUserName\Application data\Bitcoin (XP)C:\Users\YourUserName\Appdata\Roaming\Bitcoin (Vista and 7) "AppData" and "Application data" are hidden by default. You can also store Bitcoin data files in any other drive or folder. If you have already downloaded the data then you will have to move the data to the new folder.If you want to store them in D:\BitcoinData then click on "Properties" of a shortcut to bitcoin-qt.exe andadd -datadir=D:\BitcoinData at the end as an example: "C:\Program Files (x86)\Bitcoin\bitcoin-qt.exe" -datadir=d:\BitcoinData Start Bitcoin, now you will see all the files are created in the new data directory. By default Bitcoin will put its data here: You need to do a "ls -a" to see directories that start with a dot. If that's not it, you can do a search like this: find / -name wallet.dat -print 2>/dev/null By default Bitcoin will put its data here: Bitcoin's verbose log file. Automatically trimmed from time to time. Storage for keys, transactions, metadata, and options. Please be sure to make backups of this file. It contains the keys necessary for spending your bitcoins. Storage for ip addresses to make a reconnect easier Storage for peer information to make a reconnect easier. This file uses a bitcoin-specific file format, unrelated to any database system [1] . fee_estimates.dat [Versions v0.10.0 and later] Statistics used to estimate fees and priorities. Saved just before program shutdown, and read in at startup. The data, index and log files are used by Oracle Berkeley DB , the embe Continue reading >>

Bitcoin Core - Bitcoin Wiki

Bitcoin Core - Bitcoin Wiki

Bitcoin Core (formerly Bitcoin-Qt) is the third Bitcoin client , developed by Wladimir J. van der Laan based on the original reference code by Satoshi Nakamoto . [1] [2] [3] It has been bundled with bitcoind since version 0.5. [4] Bitcoin-Qt has been rebranded to Bitcoin Core since version 0.9.0 [5] . Bitcoin Core can be used as a desktop client for regular payments or as a server utility for merchants and other payment services. Source code (and build instructions for supported platforms) can be found at the Bitcoin GitHub page . Compatibility with Linux (both GNOME and KDE), Mac OS X and Windows All functionality of the original wxWidgets client Asks for confirmation before sending coins Clearer transaction list with status icons and real-time filtering Languages: Dutch, English, German, Chinese and many more. Translations are being done by volunteers on Transifex . Sendmany support in UI (send to multiple recipients in one transaction) Multiple unit support, can show subdivided bitcoins (mBTC, BTC) for users that like large numbers (only decimal units) bitcoin-cli as a RPC client, instead of bitcoind executable functioning both as a server and as a RPC client Bitcoin Core is often criticized for being slow in downloading and verifying the Bitcoin transaction database (the blockchain ). The download may be quicker using the bootstrap method . NOTE: As of version 0.10.0 it is now slower to download the blockchain via the torrent than it is to download the full blockchain through the P2P client. It has also been criticized for "hogging" upload bandwidth when peers connect to download the blockchain (possible only when run with port 8333 accessible to outside connections).This perceived "issue" has been discussed extensively on GitHub .Most modern routers support qualit Continue reading >>

Bitcoin/doc At Master Bitcoin/bitcoin Github

Bitcoin/doc At Master Bitcoin/bitcoin Github

Bitcoin Core is the original Bitcoin client and it builds the backbone of the network. It downloads and, by default, stores the entire history of Bitcoin transactions (which is currently more than 100 GBs); depending on the speed of your computer and network connection, the synchronization process can take anywhere from a few hours to a day or more. To download Bitcoin Core, visit bitcoincore.org . The following are some helpful notes on how to run Bitcoin on your native platform. Unpack the files into a directory and run: Continue reading >>

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