AvatarDavid BenderSenator Warns Unregulated Bitcoin Leaves Americans Holding A “Valueless Currency”verified_publisherTechCrunch - Gregory FerensteinSenator Joe Manchin is calling for either strict regulation or an outright ban on the controversial digital currency Bitcoin. He argues in a letter to the Federal Reserve [PDF], that as countries such as China ban Bitcoin, “Americans will be left holding the bag on a valueless currency”. Bitcoin is …