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 some states, deeds must also be signed by witnesses who watch the owner sign the deed. The person who signed the deed should record (file) the deed, with its notarized signature, in the land records office in the county where the property is located.