---
# This file is licensed under the MIT License (MIT) available on
# http://opensource.org/licenses/MIT.

layout: development-sidebar
id: development

breadcrumbs:
  - bitcoin
  - bcc
  - bcc contribute
  - Code
---

<div class="toccontent-intro" markdown="1">
  <p>{% translate involvetxt1 development %}</p>
  <p>{% translate involvetxt2 development %}</p>
  <div id="chatbox" class="chatbox"></div>

  {% capture markdown %}

<div class="warning" markdown="block">
*To report an issue, please see the [bug reporting][bcc contribute issues] page.*
</div>

## Code Review

Bitcoin Core is security software that helps protect assets worth
billions of dollars, so every code change needs to be reviewed by
experienced developers.

It can take a long time for other developers to review your pull
requests. Remember that all reviewers are taking time away from their
own projects to review your pull requests, so be patient and respectful
of their time.

Please also consider helping to review other people's pull requests. You
don't need to be an expert in Bitcoin, the Bitcoin Core codebase, or C++
(although all these things help). There are almost always [open pull
requests][bcc pulls] that any programmer can review.

## Starter Projects

Do you want to begin coding for Bitcoin Core but don't have a specific
improvement in mind?  Here are a few ideas:

- **Fix existing issues:** the [issue tracker][bcc issues] is the
  best place to find a useful way to contribute to Bitcoin Core.
  Before starting to write any patches for issues you find, you may
  want to comment on the issue to make sure nobody else is already
  working on it.

- **Write tests:** Bitcoin Core is covered by many tests, but patches
  that improve test coverage are always welcome and are a great way to
  build familiarity with the codebase.  See the documentation about
  [automated testing][bcc automated testing].

{% include references.md %}
{% endcapture %}
{% if page.lang == 'en' %}
  {{ markdown | markdownify }}
{% endif %}
</div>

<div class="toccontent-block boxexpand expanded">
  <h2 id="spec">{% translate spec %}</h2>
  <p>{% translate spectxt %}</p>
</div>

<div id="devcommunities" class="toccontent-block boxexpand expanded">
  <h2 id="dev-communities">{% translate devcommunities %}</h2>
  <p>{% translate devcommunitiesintro %}</p>

  <ul>
    <li>{% translate ircjoin %}</li>
    <li>{% translate slack %}</li>
    <li>{% translate stackexchange %}</li>
    <li>{% translate bitcointalkdev %}</li>
  </ul>
</div>

<div id="contributors" class="toccontent-block boxexpand expanded">
  <h2 id="bitcoin-core-contributors">{% translate contributors %}</h2>
  <p>{% translate contributorsorder %}</p>
  <div class="contributor-row">
    {% for c in site.corecontributors %}
    <div class="contributor">
      <div>
        <a class="contributor-name" {% if c.login %} href="https://github.com/{{c.login}}"{% endif %}>{{ c.name | htmlescape }}</a>
      </div>
      <div class="contributions">({{ c.contributions }})</div>
    </div>
    {% endfor %}
  </div>
</div>

<div class="toccontent-block boxexpand expanded">
<h2 id="more">{% translate more %}</h2>

<p>
{% case page.lang %}
{% when 'da' or 'es' or 'fr' or 'pl' or 'ro' or 'sl' or 'sv' or 'tr' or 'el' or 'bg' or 'ru' or 'uk' or 'ar' or 'fa' or 'hi' or 'ko' or 'zh_TW' %}
{% else %}
Want to contribute to a different project?
{% endcase %}</p>

<ul class="devprojectlist">
  <li><a href="https://github.com/goatpig/BitcoinArmory">Armory</a> - A wallet with enhanced security features, written in C++.</li>
  <li><a href="https://github.com/luke-jr/bfgminer">BFGMiner</a> - A modular miner, written in C.</li>
  <li><a href="https://github.com/bitcoin-wallet/bitcoin-wallet">Bitcoin Wallet</a> - A SPV wallet for Android, written in Java.</li>
  <li><a href="https://github.com/bitcoinj/bitcoinj">bitcoinj</a> - A library for SPV wallets, written in Java.</li>
  <li><a href="https://github.com/btcsuite/btcd">btcd</a> - A full node, written in Go.</li>
  <li><a href="https://github.com/btcsuite/btcwallet">btcwallet</a> - A hierarchical deterministic wallet daemon, written in Go.</li>
  <li><a href="https://bitbucket.org/ckolivas/ckpool">ckpool</a> - A fast mining pool server application, written in C.</li>
  <li><a href="https://github.com/spesmilo/electrum">Electrum</a> - A fast server-trusting wallet, written in Python.</li>
  <li><a href="https://github.com/luke-jr/eloipool">Eloipool</a> - A fast mining pool server application, written in Python.</li>
  <li><a href="https://github.com/haskoin/haskoin">Haskoin</a> - An implementation of the Bitcoin protocol, written in Haskell.</li>
  <li><a href="https://github.com/libbitcoin/libbitcoin">Libbitcoin</a> - A cross-platform development toolkit, written in C++.</li>
  <li><a href="https://github.com/libbitcoin/libbitcoin-server/">Libbitcoin Server</a> - A full node and query server, built on libbitcoin.</li>
  <li><a href="https://github.com/libbitcoin/libbitcoin-explorer">Libbitcoin Explorer</a> - A command line tool, built on libbitcoin.</li>
  <li><a href="https://github.com/bitcoin/libblkmaker">Libblkmaker</a> - A client library for the getblocktemplate mining protocol, written in C.</li>
  <li><a href="https://github.com/MetacoSA/NBitcoin">NBitcoin</a> - A cross-platform library, written in C#.</li>
  <li><a href="https://github.com/jgarzik/picocoin">picocoin</a> - A tiny library with lightweight client and utilities, written in C.</li>
  <li><a href="https://github.com/petertodd/python-bitcoinlib">python-bitcoinlib</a> - A library for structures and protocols, written in Python.</li>
  <li><a href="https://github.com/luke-jr/python-blkmaker">Python Blkmaker</a> - A client library for the getblocktemplate mining protocol, written in Python.</li>
  <li class="more"><a onclick="librariesShow(event)" ontouchstart="librariesShow(event);" class="link-js">{% translate moremore %}</a></li>
</ul>
</div>
