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.
A legally binding real estate contract must be signed by all parties involved and something of value must be exchanged. A handshake alone is not sufficient to legally seal an agreement. In addition to signatures, a contract must be sealed with a tangible commodityâsuch as cash, goods or services.