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.
Legal Requirements for Transaction. Contract Requirements. Agreements for the purchase of real property generally must be in writing and be signed to be enforceable. An offer signed by the buyer that includes all essential terms and which is accepted and signed by the seller can constitute a binding contract.