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Bitcoin Core integration/staging tree
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=====================================
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[](https://travis-ci.org/bitcoin/bitcoin)
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https://bitcoincore.org
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What is Bitcoin?
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----------------
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Bitcoin is an experimental digital currency that enables instant payments to
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anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate
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with no central authority: managing transactions and issuing money are carried
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out collectively by the network. Bitcoin Core is the name of open source
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software which enables the use of this currency.
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For more information, as well as an immediately useable, binary version of
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the Bitcoin Core software, see https://bitcoin.org/en/download, or read the
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[original whitepaper](https://bitcoincore.org/bitcoin.pdf).
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License
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-------
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Bitcoin Core is released under the terms of the MIT license. See [COPYING](COPYING) for more
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information or see https://opensource.org/licenses/MIT.
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Development Process
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-------------------
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The `master` branch is regularly built and tested, but is not guaranteed to be
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completely stable. [Tags](https://github.com/bitcoin/bitcoin/tags) are created
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regularly to indicate new official, stable release versions of Bitcoin Core.
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The contribution workflow is described in [CONTRIBUTING.md](CONTRIBUTING.md).
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The developer [mailing list](https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev)
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should be used to discuss complicated or controversial changes before working
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on a patch set.
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Developer IRC can be found on Freenode at #bitcoin-core-dev.
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Testing
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-------
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Testing and code review is the bottleneck for development; we get more pull
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requests than we can review and test on short notice. Please be patient and help out by testing
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other people's pull requests, and remember this is a security-critical project where any mistake might cost people
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lots of money.
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### Automated Testing
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Developers are strongly encouraged to write [unit tests](/doc/unit-tests.md) for new code, and to
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submit new unit tests for old code. Unit tests can be compiled and run
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(assuming they weren't disabled in configure) with: `make check`
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There are also [regression and integration tests](/qa) of the RPC interface, written
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in Python, that are run automatically on the build server.
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These tests can be run (if the [test dependencies](/qa) are installed) with: `qa/pull-tester/rpc-tests.py`
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The Travis CI system makes sure that every pull request is built for Windows, Linux, and OS X, and that unit/sanity tests are run automatically.
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### Manual Quality Assurance (QA) Testing
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Changes should be tested by somebody other than the developer who wrote the
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code. This is especially important for large or high-risk changes. It is useful
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to add a test plan to the pull request description if testing the changes is
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not straightforward.
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Translations
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------------
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Changes to translations as well as new translations can be submitted to
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[Bitcoin Core's Transifex page](https://www.transifex.com/projects/p/bitcoin/).
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Translations are periodically pulled from Transifex and merged into the git repository. See the
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[translation process](doc/translation_process.md) for details on how this works.
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**Important**: We do not accept translation changes as GitHub pull requests because the next
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pull from Transifex would automatically overwrite them again.
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Translators should also subscribe to the [mailing list](https://groups.google.com/forum/#!forum/bitcoin-translators).
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