Final answer:
Aragorn, also known as Strider, proves his true identity through various actions, characteristics, and knowledge known only to the real Strider.
Step-by-step explanation:
In J.R.R. Tolkien's novel The Lord of the Rings, Aragorn, a ranger known as Strider, proves his true identity through numerous actions, characteristics, and knowledge known only to the real Strider.
For example, Aragorn can use the ancient language of the Elves and knows the secret passages of the Mines of Moria. He possesses a legendary sword named Andúril and has a deep understanding of the history and lineage of the Numenorean kings.
Furthermore, Aragorn displays exceptional tracking and survival skills and earns the trust and loyalty of the Fellowship of the Ring. These various evidences and his actions throughout the story confirm that Aragorn is indeed the real Strider.