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Re: [webauthn] Platform authentication registration promotion when the user has authenticated with the external authenticator (#1759)

From: Adam Langley via GitHub <sysbot+gh@w3.org>
Date: Wed, 29 Jun 2022 15:49:16 +0000
To: public-webauthn@w3.org
Message-ID: <issue_comment.created-1170152931-1656517678-sysbot+gh@w3.org> 
> But, how can we distinguish that the credential is coming from the platform authenticator or from the roaming authenticator

The `authenticatorAttachment` value in the [resulting object](https://w3c.github.io/webauthn/#iface-pkcredential) will tell you if the device used to generate the assertion was `platform` or `cross-platform`.

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