Is there a fan theory that batman can discover spider man s identity?

The verified sources supplied mention Batman as a known entity and provide background on Peter Parker/Spider‑Man within the Marvel Cinematic Universe. No reference is made to any crossover, interaction, or fan theory involving Batman learning Spider‑Man’s identity. Without such evidence, it cannot be asserted that such a theory exists. In the absence of documented claims, the safe conclusion is that no documented fan theory of this nature is supported by the provided sources.