o1js

o1js  

o1js helps developers build apps powered by zero-knowledge (zk) cryptography.

The easiest way to write zk programs is using o1js.

o1js is a TypeScript library for zk-SNARKs and zkApps. You can use o1js to write zk smart contracts based on zero-knowledge proofs for the Mina Protocol.

o1js is automatically included when you create a project using the Mina zkApp CLI.

Learn More

• To learn more about developing zkApps, see the zkApp Developers docs.

• For guided steps building and using zkApps, see the zkApp Developers Tutorials.

• To meet other developers building zkApps with o1js, participate in the #zkapps-developers channel on Mina Protocol Discord.

• For a list of changes between versions, see the CHANGELOG.

• To stay up to date with o1js, see the O(1) Labs Blog.

Contributing

o1js is an open source project. We appreciate all community contributions to o1js!

See the Contributing guidelines for ways you can contribute.

Community Packages

High-quality community packages from open source developers are available for your project.

• snarkyjs-elgamal A partially homomorphic encryption library for o1js based on Elgamal encryption: GitHub and npm

To include your package, see Creating high-quality community packages.

Changelog

0.12.1

Added

• Added a method createTestNullifier to the Nullifier class for testing purposes. It is recommended to use mina-signer to create Nullifiers in production, since it does not leak the private key of the user. The Nullifier.createTestNullifier method requires the private key as an input outside of the users wallet. https://github.com/o1-labs/o1js/pull/1026
• Added field.isEven to check if a Field element is odd or even. https://github.com/o1-labs/o1js/pull/1026

Fixed

• Revert verification key hash change from previous release to stay compatible with the current testnet https://github.com/o1-labs/o1js/pull/1032