What is the validity of the claim that 'Uthman ibn 'Affan (may Allah be pleased with him) innovated the second adhan?

Question:
Regarding the second adhan, some claim that 'Uthman ibn 'Affan innovated it. Is their statement correct?

Answer:
Their statement is invalid. 'Uthman is one of the Rightly Guided Caliphs (may Allah be pleased with him); he is the third caliph. The Prophet (peace and blessings be upon him) said: "Hold fast to my Sunnah and the Sunnah of after me." Is 'Uthman not among them? Yes? Yes, 'Uthman (may Allah be pleased with him) is among them. So his Sunnah, and his establishment of the second adhan, is part of the Sunnah of the Messenger (peace and blessings be upon him). Yes. He established the second adhan for a benefit. When the people in Madinah increased and became occupied with their farms, markets, buying, and selling, he made the first adhan a notification so that they would prepare for the Friday prayer. Yes.