The W3C Web Authentication API[1] provides an official replacement for the internal extension that Chrome ships to implement the FIDO U2F API for security keys. The getTransports call is part of the current level two draft[2] and provides transport (e.g. USB, NFC, etc) information without wedging it into the attestation certificate, which is the current practice. [1] https://w3c.github.io/webauthn/ [2] https://github.com/w3c/webauthn/commit/11d549048ac5e462a4f9f44499032302adb29800