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[[ch03_bitcoin_client]]
== The Bitcoin Client
=== Bitcoin Core - The reference implementation
=== Bitcoin Core: The Reference Implementation
You can download the Reference Client _Bitcoin Core_, also known as the "Satoshi client", from bitcoin.org. The reference client implements all aspects of the bitcoin system, including wallets, a transaction verification engine with a full copy of the entire transaction ledger (blockchain) and a full network node in the peer-to-peer bitcoin network.
You can download the reference client _Bitcoin Core_, also known as the "Satoshi client," from bitcoin.org. The reference client implements all aspects of the bitcoin system, including wallets, a transaction verification engine with a full copy of the entire transaction ledger (blockchain), and a full network node in the peer-to-peer bitcoin network.
Go to http://bitcoin.org/en/choose-your-wallet and select "Bitcoin Core" to download the reference client. Depending on your operating system, you will download an executable installer. For Windows, this is either a ZIP archive or an EXE executable. For Mac OS it is a DMG disk image. Linux versions include a PPA package for Ubuntu or a TAR.GZ archive.
Go to http://bitcoin.org/en/choose-your-wallet and select "Bitcoin Core" to download the reference client. Depending on your operating system, you will download an executable installer. For Windows, this is either a ZIP archive or an EXE executable. For Mac OS it is a DMG disk image. Linux versions include a PPA package for Ubuntu or a TAR.GZ archive.The web page listing recommended bitcoin clients is shown in <<bitcoin-choose-client>>.
[[bitcoin-choose-client]]
.Bitcoin - Choose A Bitcoin Client
.Bitcoin - Choose a bitcoin client
image::images/msbt_0301.png["bitcoin choose client"]
==== Running Bitcoin Core for the first time
==== Running Bitcoin Core for the First Time
If you download an installable package, such as an EXE, DMG or PPA, you can install it the same way as any application on your operating system. For Windows, run the EXE and follow the step-by-step instructions. For Mac OS, launch the DMG and drag the Bitcoin-QT icon into your Applications folder. For Ubuntu, double-click on the PPA in your File Explorer and it will open the package manager to install the package. Once you have completed installation you should have a new application "Bitcoin-Qt" in your application list. Double-click on the icon to start the bitcoin client.
If you download an installable package, such as an EXE, DMG, or PPA, you can install it the same way as any application on your operating system. For Windows, run the EXE and follow the step-by-step instructions. For Mac OS, launch the DMG and drag the Bitcoin-QT icon into your _Applications_ folder. For Ubuntu, double-click the PPA in your File Explorer and it will open the package manager to install the package. Once you have completed installation you should have a new application called "Bitcoin-Qt" in your application list. Double-click the icon to start the bitcoin client.
The first time you run Bitcoin Core it will start downloading the blockchain, a process that may take several days. Leave it running in the background until it displays "Synchronized" and no longer shows "Out of sync" next to the balance.
The first time you run Bitcoin Core it will start downloading the blockchain, a process that may take several days (see <<bitcoin-qt-firstload>>). Leave it running in the background until it displays "Synchronized" and no longer shows "Out of sync" next to the balance.
[TIP]
====
Bitcoin Core keeps a full copy of the transaction ledger (blockchain), with every transaction that has ever occurred on the bitcoin network since its inception in 2009. This dataset is several gigabytes in size (approximately 16GB in late 2013) and is downloaded incrementally over several days. The client will not be able to process transactions or update account balances until the full blockchain dataset is downloaded. During that time, the client will display "Out of sync" next to the account balances and show "Synchronizing" in the footer. Make sure you have enough disk space, bandwidth and time to complete the initial synchronization.
Bitcoin Core keeps a full copy of the transaction ledger (blockchain), with every transaction that has ever occurred on the bitcoin network since its inception in 2009. This dataset is several gigabytes in size (approximately 16GB in late 2013) and is downloaded incrementally over several days. The client will not be able to process transactions or update account balances until the full blockchain dataset is downloaded. During that time, the client will display "Out of sync" next to the account balances and show "Synchronizing" in the footer. Make sure you have enough disk space, bandwidth, and time to complete the initial synchronization.
====
[[bitcoin-qt-firstload]]
.Bitcoin Core - The Graphical User Interface, during the blockchain initialization
.Bitcoin Core - The graphical user interface, during the blockchain initialization
image::images/msbt_0302.png["bitcoin-qt first run"]
==== Compiling Bitcoin Core from the source code
==== Compiling Bitcoin Core from the Source Code
For developers, there is also the option to download the full source code as a ZIP archive or by cloning the authoritative source repository from Github. Go to https://github.com/bitcoin/bitcoin and select "Download ZIP" from the sidebar. Alternatively, use the git command line to create a local copy of the source code on your system. In the example below, we are cloning the source code from a unix-like command-line, in Linux or Mac OS:
For developers, there is also the option to download the full source code as a ZIP archive or by cloning the authoritative source repository from GitHub. Go to https://github.com/bitcoin/bitcoin and select "Download ZIP" from the sidebar. Alternatively, use the git command line to create a local copy of the source code on your system. In the following example, we are cloning the source code from a Unix-like command line, in Linux or Mac OS:
[source,bash]
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