Function validate_event_signature_hash 

pub fn validate_event_signature_hash(
    event_name: &str,
    target_event_signature_hash: &str,
    log: &Log,
) -> Result<()>

Validates that a log entry corresponds to the expected event by comparing its topic0 with the provided event signature hash.

Errors

Returns an error if the event signature doesn’t match or if topic0 is missing.