We had originally planned to go all-in on passkeys for ONCE/Campfire, and we built the early authentication system entirely around that. It was not a simple setup! Handling passkeys properly is surprisingly complicated on the backend, but we got it done. Unfortunately, the user experience kinda sucked, so we ended up ripping it all out...
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Bitwarden just announced a consortium with Apple, Google, 1Password, etc to create a secure import/export format for credentials; spurred by the need for passkeys to be portable between password managers (but also works for passwords/other credential types)
I’m definitely holding off on passkeys until that project is finished. I also don’t want vendor lock in and while that seems like the solution, it seems like they just started working on it.