Well, we finally have a glimpse at “Square,” the new mobile payments venture coming from Twitter co-founder and chairman Jack Dorsey. As expected, it’s a little hardware add-on that can turn an iPhone into a credit card reader.

The funny part: Details about the small-business-oriented project have been on the Web for months. It was just that nobody had put two and two together until some eagle-eyed folks at Engadget realized that a URL on a screenshot of the “Square iPhone Payments Venture” first reported by Coolhunting matched a domain registered to Dorsey.