From the FTC:
The Federal Trade Commission is challenging the public to create an innovative solution that will block illegal commercial robocalls on landlines and mobile phones. As part of its ongoing campaign against these illegal, prerecorded telemarketing calls, the agency is launching the FTC Robocall Challenge, and offering a $50,000 cash prize for the best technical solution.
This is the agency’s first government contest hosted on Challenge.gov, an online challenge platform administered by the U.S. General Services Administration, in partnership with ChallengePost. Challenge.gov empowers the U.S. government and the public to bring the best ideas and top talent to bear on our nation’s most pressing issues.
Read more about the challenge on FTC.