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Open-Transactions Library Project

License: MPL 2.0

Android Linux Windows

The Open-Transactions project is a collaborative effort to develop a robust, commercial-grade, fully-featured, free-software toolkit implementing the OTX protocol as well as a full-strength financial cryptography library, API, CLI, and prototype server. The project is managed by a worldwide community of volunteers that use the Internet to communicate, plan, and develop the Open-Transactions toolkit and its related documentation.

Official Wiki


Open-Transactions democratizes financial and monetary actions. You can use it for issuing currencies/stock, paying dividends, creating asset accounts, sending/receiving digital cash, writing/depositing cheques, cashier's cheques, creating basket currencies, trading on markets, scripting custom agreements, recurring payments, escrow, etc.

Open-Transactions uses strong crypto. The balances are unchangeable (even by a malicious server.) The receipts are destructible and redundant. The transactions are unforgeable. The cash is untraceable. The cheques are non-repudiable. Etc.

This product includes software developed by Ben Laurie for use in the Lucre project.


All development goes in develop branch - please don't submit pull requests to master.

Use clang-format and cmake-format.

clang-format Git hook

For convenience please enable the git hook which will trigger clang-format each time you commit. To do so type in the repo directory:

cd .git/hooks
ln -s ../../cmake/scripts/git_hooks/pre-commit

Build Instructions

Ensure opentxs is fully checked out prior to running cmake:

git submodule update --init --recursive

Basic build instructions:

mkdir build
cd build
cmake --build .
ctest -j4
sudo cmake --install .

Supported Compilers

  • gcc-11.3
  • gcc-12.2
  • clang-13
  • clang-14
  • clang-15
  • AppleClang-14
  • msvc-19.33