Foundation has introduced the Universal Ethereum Signer app for its Passport Prime hardware wallet. The application was developed by Ledger co-founder Nicolas Bacca with funding from an Ethereum Foundation grant provided to his company, ZKnox. The tool allows users to review and sign Ethereum transactions on air-gapped hardware.
The software currently runs on the KeyOS operating system, which is an open-source microkernel written in Rust. Because the app is in beta, users must manually sideload it onto their devices. Foundation plans to launch an official app catalog in winter 2026 to simplify the distribution of trusted updates.
The Passport Prime device, which retails for $349, became generally available in May 2026 following a funding round of $6.4 million. The hardware features a 3.5-inch touchscreen and 50 GB of encrypted storage. It integrates a Bitcoin wallet with FIDO security keys and two-factor authentication.
In October 2026, Foundation experienced a phishing campaign that affected over 23,000 customer email addresses. The company confirmed that the incident did not compromise any private keys or funds stored on its hardware devices. The introduction of Ethereum support aims to broaden the utility of the Passport platform.
