According to Crypto Briefing, the Ethereum Foundation launched Universal Ethereum Signer, a signing application developed by Ledger co-founder Nicolas Bacca, on Foundation's Passport Prime hardware device running KeyOS on November 13. The app enables secure review and signing of Ethereum transactions on isolated hardware without exposing private keys to phones or computers.

Currently in testing, users must manually sideload the app to Passport Prime. Foundation CEO Zach Herbert announced a trusted app directory will push updates directly to users, expected in winter 2026.

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