To see if you have unclaimed property, you'll need to search your name in your state's online database.

WSJ: Search for Unclaimed Money

Square believes the future of payments isn't swiping a card but merely giving a cashier your name, which is stored within the company's database and linked to a credit card.

CNN: Square unveils a new countertop register

You simply send the company your name and address and it will cross-reference your details with its database.

BBC: Finding your lost fortune