What tinman did to show he had a heart?

The Tin Man, a character from L. Frank Baum's "The Wizard of Oz," demonstrates that he has a heart through his actions and emotions throughout the story. He shows compassion and kindness, particularly in how he cares for Dorothy and her friends, often expressing concern for their well-being. His desire to obtain a heart symbolizes his capacity for love and empathy, which manifests in his dedication to helping others. Ultimately, his journey reveals that he already possesses the qualities of a loving heart, despite believing he lacks one.