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Bitcoin is an experimental new digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Unlimited is the name of open source software which enables the use of this currency.

For more information, as well as an immediately useable, binary version of the Bitcoin Unlimited software, see https://www.bitcoinunlimited.info/download, or read the original whitepaper.

Bitcoin Unlimited is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.

Bitcoin Unlimited is an implementation of the Bitcoin client software that is based on Bitcoin Core. However, Bitcoin Unlimited has a very different philosophy than Core.

It follows a philosophy and is administered by a formal process described in the Articles of Federation. In short, we believe in market-driven decision making, emergent consensus, and giving our users choices.

If you're running an Ubuntu system:

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:bitcoin-unlimited/bu-ppa
sudo apt-get update
sudo apt-get install bitcoind bitcoin-qt

If you're compiling from source:

sudo apt-get install git build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils libboost-all-dev
## optional: only needed if you want bitcoin-qt
sudo apt-get install libqt4-dev libprotobuf-dev protobuf-compiler libqrencode-dev
## optional: only needed if your wallet use the old format
sudo apt-get install software-properties-common

## this not needed if your wallet will use the new
## format, ot if you're not going to use a wallet at all
sudo add-apt-repository ppa:bitcoin-unlimited/bu-ppa
sudo apt-get update
sudo apt-get install libdb4.8-dev libdb4.8++-dev

mkdir -p ~/src
cd ~/src
git clone https://github.com/BitcoinUnlimited/BitcoinUnlimited.git bu-src
cd bu-src
./autogen.sh
./configure
make
sudo make install

For more detailed explanations on how compile from source just look at doc/build-*.md files (e.g. here)