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.
The signatures needed in a real estate deed can vary by state, type of deed, and circumstances. In all fifty states, a deed must be signed and acknowledged by the grantor. Additional signatures may also be required, such as a grantee's signature, witnesses, a notary public, and the document preparer.