Optional
blobThe opaque byte string that was associated with the credential identified by rawId. Only valid if read was true.
Optional
supportedTrue if, and only if, the created credential supports storing large blobs. Only present in registration outputs.
Optional
writtenA boolean that indicates that the contents of write were successfully stored on the authenticator, associated with the specified credential.
LargeBlob extension outputs
See
https://w3c.github.io/webauthn/#dictdef-authenticationextensionslargebloboutputs