The Ethereum Foundation (EF) announced that it is working with Ledger co‑founder Nicolas Bacca to create a Universal Ethereum Signer app that will operate on Foundation’s Passport Prime hardware wallet. The initiative, first disclosed in an interview with Foundation CEO Zach Herbert on Unchained Premium on Oct. 22, marks the EF’s initial foray into providing a signing application for a hardware‑wallet‑like device.

ETH / USD
Source: CoinGecko. Prices are indicative.

App development and technical details

According to Unchained, the signer app’s source code is hosted in a public GitHub repository under the Ethereum organization and is described as a reference implementation for Ethereum hardware signers. The code has not yet been audited, and a formal release channel for the KeyOS version is still being defined. KeyOS, the operating system that powers Passport Prime, isolates each app in its own sandbox and supplies a hardened child key derived from the user’s master key rather than exposing the master seed, a design meant to prevent malicious apps from compromising the device.

Distribution model and upcoming app catalog

During the interview, Herbert explained that the current beta version must be sideloaded from a computer or flash drive, with users trusting the developer’s certificate. Foundation plans to launch an app catalog within “the next month or two,” which will feature a community‑driven review process. Trusted developers will be able to push updates and emergency patches directly to users, a model Herbert likened to F‑Droid on GrapheneOS.

Developer outreach and device allocation

Herbert said that after meeting Foundation’s team at a European conference, Bacca received developer units and began building the app independently, without a formal specification session with the EF. Foundation has reportedly distributed “probably over 200, maybe over 250” of the 1,000 Passport Prime devices earmarked for developers, indicating a growing ecosystem of third‑party contributors.

What to watch next

The next milestones to monitor include the public release of the Universal Ethereum Signer app, the rollout of the app catalog, and any security audit results for the signer code. Additionally, the Ethereum Foundation’s forthcoming formal report on recent backend attacks and phishing attempts may provide further context on the platform’s security posture.

FAQ

What is the Universal Ethereum Signer app?

It is a reference implementation for Ethereum hardware signers that runs on Foundation’s KeyOS operating system and is designed to be sandboxed and use hardened child keys.