Development of the banknote began in the Tang Dynasty during the 7th century, with local issues of paper currency, although true paper money did not appear until the 11th century, during the Song Dynasty.
A contract typically does not have to be notarized. A notary public (or simply notary) provides an acknowledgment that the signature appearing on the document is that of the person whose signature it purports to be. There is a requirement that some documents be notarized, such as a real property deed.
In Florida, for example, deeds must have at least two witnesses (or be notarized) before being recorded and acknowledged as legally binding. If you're worried that your contract might need to be notarized or witnessed, consult an experienced contracts attorney in your area. Follow FindLaw for Consumers on Google+. Related Resources: 1  5 Clauses Every Employment Contract Should Include (FindLaw's Free Enterprise).