We spent three years building our own operating system from scratch. No Android. No off-the-shelf firmware. Just a microkernel OS written in Rust. KeyOS powers Passport Prime and delivers real process isolation, every app sandboxed, secure message-passing between processes, running on a 500 MHz security processor. It's fully open-source, built on the Xous kernel, and we're opening it up to third-party developers. Every app must be open-source with reproducible builds. Full technical deep dive: foundation.xyz/2024/12/building-keyos/