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Worldcoin Core integration/staging tree

Copyright (c) 2009-2014 Bitcoin Developers, Copyright (c) 2011-2014 Litecoin Developers, Copyright (c) 2013-2021 Worldcoin Developers

What is Worldcoin?

Worldcoin is an improved version of Bitcoin using Scrypt as a proof-of-work algorithm.

  • 30 second block targets
  • 20160 blocks to retarget difficulty
  • starts at 64 coins per block
  • subsidy is reduced 1% every week to a minimum reward of 1 WDC per block
  • ~265 million total coins

For more information, as well as an immediately usable, binary version of the Worldcoin client software, see


Worldcoin Core is released under the terms of the MIT license. See COPYING for more information or see

Development Process

The master branch is regularly built and tested, but is not guaranteed to be completely stable. Tags are created regularly to indicate new official, stable release versions of Worldcoin Core.

The contribution workflow is described in and useful hints for developers can be found in doc/

The developer mailing list should be used to discuss complicated or controversial changes before working on a patch set.

Developer IRC can be found on Freenode at #worldcoin-dev.


Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.

Automated Testing

Developers are strongly encouraged to write unit tests for new code, and to submit new unit tests for old code. Unit tests can be compiled and run (assuming they weren't disabled in configure) with: make check. Further details on running and extending unit tests can be found in /src/test/

There are also regression and integration tests, written in Python, that are run automatically on the build server. These tests can be run (if the test dependencies are installed) with: test/functional/

The Travis CI system makes sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.

Manual Quality Assurance (QA) Testing

Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.