(TrendHunter.com) eBay debuted its Mobile Authenticator at Europe’s largest Sneaker Festival, Crepe City in London, and now the sneaker authenticator is coming to various cities to help sneaker collectors... (TrendHunter.com) eBay debuted its Mobile Authenticator at Europe’s largest Sneaker Festival, Crepe City in London, and now the sneaker authenticator is coming to various cities to help sneaker collectors...