Syscoin is a crypto currency that is universally merge-mineable and offers a unique variety of services including decentralized identities, marketplaces and certificate management, escrow, asset token issuance platform capabilities directly on the blockchain.
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willyko Merge pull request #290 from syscoin/dev-3.x
3.1.4 bitcoin vulnerability fix
Latest commit bbabfd9 Sep 24, 2018

Syscoin Core staging tree

master: Build Status

What is Syscoin?

Syscoin is a merge-minable SHA256 coin which provides an array of useful services which leverage the bitcoin protocol and blockchain technology.

  • 1 minute block targets, diff retarget each block using Dark Gravity Wave(24)
  • 888 million total coins (deflation 5 percent per year, deflation on all payouts)
  • Block time: 60 seconds target
  • Rewards: 38.5 Syscoins per block deflated 5 percent per year.
    • 10 percent to governance proposals (3.85 Syscoins / block).
    • 22.5 percent to miner (8.6625 Syscoins / block)
    • 67.5 percent to masternode (25.9875 Syscoins / block)
  • SHA256 Proof of Work
  • Mineable either exclusively or via merge-mining any SHA256 PoW coin
  • Syscoin data service fees burned
  • Masternode collateral requirement: 100000 Syscoins
  • Masternode seniority: 3 percent every 4 months until 27 percent over 3 years
  • Governance proposals payout schedule: every month
  • Governance funding per round (168630 Syscoins per month)

Services include:

  • Hybrid layer 2 PoW/PoS consensus with bonded validator system (masternodes)
  • Decentralized governance (blockchain pays for work via proposals and masternode votes)
  • Decentralized identity reservation, ownership, and exchange
  • Digital certificate storage, ownership, and exchange
  • Distributed marketplace and exchange
  • Digital services provider marketplace and platform
  • Digital asset creation and management
  • Decentralized escrow service

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


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

Development Process

The master branch is meant to be stable. Development is normally done in separate branches. Tags are created to indicate new official, stable release versions of Syscoin Core.

The contribution workflow is described in


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.

There are also regression and integration tests of the RPC interface, written in Python, that are run automatically on the build server. These tests can be run (if the test dependencies are installed) with: qa/pull-tester/

Syscoin test suites can run by cd src/test && ./test_syscoin

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

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.


Changes to translations as well as new translations can be submitted to Syscoin Core's Transifex page.

Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.

Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.