According to Foundation CEO Zach Herbert, the Ethereum Foundation debuted the Universal Ethereum Signer app on Passport Prime at $349 on November 12, 2026. The app, built by Ledger co-founder Nicolas Bacca, runs on KeyOS, the operating system Foundation developed for its Passport hardware line. Each application on the device receives a hardened child key rather than access to the master private key, isolating apps in sandboxes. The KeyOS microkernel runs roughly 9,000 lines of code, compared to approximately 40 million in the Linux kernel, enabling comprehensive code auditing and formal verification.

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