I was mainly thinking of Samsung's SmartTag, not Google's recent venture. I have looked for info on the SmartTags in the past and couldn't find it. I have some Samsung ones myself.
I didn't look at the Google ones because I don't use a Google account. So I couldn't use them anyway.
But good to hear that they did design it well, I'll check that video.
You are wrong and it's trivially verifiable. You can watch this years 38c3 video comparing them or read the nicely public specification.