A ChangeBlobKeyRequest can fail with a few non-standard named errors:
PasswordIncorrect if there is no blob for the given key
UserNotFound if the user does not exist
RequiresNewSalt if the given salt is the same as the old salt
Conflict if knownRevision is specified and doesn't match
A ChangeBlobKeyRequest can fail with a few non-standard named errors: PasswordIncorrect if there is no blob for the given key UserNotFound if the user does not exist RequiresNewSalt if the given salt is the same as the old salt Conflict if knownRevision is specified and doesn't match