Same way they prevent fraud with cash - paper certificates with features that are hard to copy. Also, the company has a record of what was issued and isn't goin

Same way they prevent fraud with cash - paper certificates with features that are hard to copy. Also, the company has a record of what was issued and isn't going to pay off the same bond twice, or one that doesn't match what it issued. Doesn't stop people from trying - http://www.reuters.com/article/2012/02/17/usa-bonds-forgery-idUSL5E8DH41Q20120217 http://www.reuters.com/article/2012/02/17/usa-bonds-forgery-...