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 such instances, the creditor may require the signature of the non-applicant joint owner, including a spouse, but only on the document necessary, or reasonably believed necessary by the creditor, to provide adequate protections to satisfy the debt in the event of the applicant's death or default.