Square, the payments startup from Twitter cofounder Jack Dorsey, has prototyped a Square credit card. The plastic card is all black, and save for the card holder's name emblazoned on the face, features no logos--not even Square's. Over the past year, multiple sources indicate Square employees have been carrying the card--seen here below, partially blurred to protect the card holder's identity--around in their wallets. However, despite buzz about the potential of a Square credit card, other company sources indicate the project was recently killed. Details of the rumored prototype came to light during reporting for Fast Company's profile of Square, published this week. As Square seeks to unearth new sources of revenue beyond its core business of payments processing, the company has launched a slew of new products.