The Ethereum Foundation is launching a beta version of the Universal Ethereum Signer app on Passport Prime, Foundation’s hardware wallet running KeyOS. Developed by Nicolas Bacca, a Ledger co-founder and the head of ZKnox, it allows users to review and sign Ethereum transactions on a separate, air-gapped device. Users must currently sideload the application manually, but an app catalog allowing trusted groups to push updates directly is expected to launch in winter 2026. The $349 Passport Prime combines a Bitcoin wallet, a FIDO security key, 50 GB of encrypted storage and an open-source microkernel written in Rust.
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