The WPP agency picked up the account following a competitive review.
FMCG giant wants to develop blockchain as solution for wider digital supply chain.
The fee on the account is estimated at $30 million.
World's top advertiser is one of MediaCom's biggest clients.
Brands include Davidoff, JPS and Parker & Simpson.
Annual advertising expense fell for third year in a row to $6.75bn.
Experience ties in with campaign for brand's new Wonderlust fragrance.
Debate has moved 'from brand safety to public safety', members of new alliance say.
How do the best client-agency partnerships work?
The new film follows on the success of the award-winning and groundbreaking video, 'The Talk.'