Start here

Longfellow-ZK provides reusable C++20 proof machinery, plus separate ECDSA, BIP340, and mdoc circuit packages. Choose the path that matches what you need to ship.

Build a project on Longfellow-ZK

1. Build, test, and install the base library.
2. Integrate only through an installed LongfellowZK CMake target and its documented API and ABI.
3. Add a named circuit package if your application needs ECDSA, BIP340, or mdoc.
4. Before deployment, review the security and qualification boundary.

Maintain a distribution package

1. Follow the distribution packaging recipe, including staged installation, package splitting, and installed-consumer checks.
2. Apply the 0.x ABI policy when naming shared-library packages and coordinating transitions.
3. Run the release qualification appropriate to the packaged targets.
4. Ship the GPL license and preserve all file-level upstream notices.

Evaluate the design

For product context, start with zero-knowledge in plain language and use cases. For technical review, continue to the architecture, specifications, and interoperability records.

Longfellow-ZK is not a wallet, credential issuer, blockchain, or blanket production-safety claim. The circuit, parameters, integration, and release artifacts must be assessed together.

Help, support, and licensing

The distribution is licensed under the GNU GPL, version 3 or later. It is free to use, study, modify, and redistribute; distributed software that uses the library must be released under the same GPL terms. For adoption, packaging, security coordination, or licensing needs, contact info@dyne.org. We will work with you toward a suitable solution.