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Catcoin integration/staging tree

Copyright (c) 2009-2015 Bitcoin Developers Copyright (c) 2011-2015 Litecoin Developers Copyright (c) 2013-2015 Catcoin Developers See the file CREDITS for further info on the cats responsible for this

What is Catcoin?

Catcoin is a version of the Litecoin cryptographic currency, using scrypt as a proof-of-work algorithm, and using substantially similiar blockchain parameters to Bitcoin:

  • 50 coins per block
  • 10 minutes block targets
  • Subsidy halves in 210k blocks
  • 21 million total coins
  • 1 block difficulty adjustment using multiple methods

For more information, as well as an immediately useable, binary version of the Catcoin client sofware, see


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

Development process

Developers work in their own trees, then submit pull requests when they think their feature or bug fix is ready.

If it is a simple/trivial/non-controversial change, then one of the Catcoin development team members simply pulls it.

If it is a more complicated or potentially controversial change, then the patch submitter will be asked to start a discussion (if they haven't already) on #catcoin-dev on IRC. (on the freenode network)

The patch will be accepted if there is broad consensus that it is a good thing. Developers should expect to rework and resubmit patches if the code doesn't match the project's coding conventions (see doc/coding.txt) or are controversial.


Testing and code review is the bottleneck for development; we get more pull requests than we can review and test. Please be patient and help out, 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 for the core code are in src/test/. To compile and run them:

cd src; make -f makefile.unix test

Unit tests for the GUI code are in src/qt/test/. To compile and run them:

qmake BITCOIN_QT_TEST=1 -o Makefile.test
make -f Makefile.test


Release versions of Catcoin




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