Who signed the 26th Amendment?

This amendment was passed by Congress on March 23, 1917 and ratified on July 1, 1971 while Richard Nixon was president. However, the president is not part of the amendment process. Proposed amendments do not require the approval of the President. Of course the president can give his opinion and lobby for or against an amendment, but he can not veto it. If he signs it, his signature has no legal bearing on it.