Good point -- in this case I'm using the URL it passes back, which was the only information it had. The original one was passed either as base64 encoded or a UR

Good point -- in this case I'm using the URL it passes back, which was the only information it had. The original one was passed either as base64 encoded or a URL. IIRC the URL they passed back was random-feeling, but I'd have to look to check it out. Its possible that the initial URL encoded a little more, depending on how the filename works, but my guess is that the model is good enough that, say, "royce_hall.jpeg" wouldn't change it too drastically, especially not over time...