A secure, open source U2F token you can make with $4.5 worth of parts

In plain words

U2F Zero is an open source USB security token designed for two-factor authentication. It can be assembled from affordable components costing around $4.50, making it accessible for developers and security-conscious users. The project prioritizes physical security, affordability, and aesthetic design. Available on GitHub, it has been superseded by the Solo security key project.

written from the facts on this page · September 2026

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  Hi HN, We (myself, Adhyyan1252 and yush_g) are undergrad students that hacked out this side project last month during Hack Lodge[1] (the ideas and many of the underlying circuits for which came from the 0xPARC community[2])! We’re extremely excited to share this new primitive. Besides the technical challenges building this project that folks here would find interesting (fixing the ZK proof compiler, modifying nodeJS V8 params etc.), we think this is a very novel use case for ZK tech, and ECDSA inside ZK-SNARKs is a starting point that unlocks many other ideas! :D A summarized version of our…

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