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 either case, the form must be completed and signed by the notary public and then sealed. The commission number or expiration must also be included for the acknowledgment to be proper. Forms to be filed at the register of deeds office must be notarized to show the authentication of the signature(s).