Nostalgia meets technology with a new way to trade sports cards -- a far cry from playground swaps or Lynchie's prized collection getting tossed by his dad. We check in with Alt founder and CEO Leore Avidar, who's won big-name backing (including Kevin Durant, Alexis Ohanian) for a platform meant to bring transparency and predictability to a booming market.

See omnystudio.com/listener for privacy information.