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.
Normally the grantor/seller is the only person who needs to sign the deed. The signature must be an original signature. Also, a valid deed must contain a legal description of the property and contain the names and addresses of all parties referenced in the document.