Eric T.K. Lim and Chee-Wee Tan

While technology has been making more devices “smart”, and we carry phones with all sorts of sensors, these haven’t yet been systematically applied to advertising’s central problem – engagement. The blockchain, however, will make advertising much smarter.
 
 Traditional advertising – think of posters on bus stops and TV commercials – is easy to ignore and its effectiveness is hard to measure. Even online advertising has problems measuring engagement. But with the blockchain, advertisers will be able to tap into the data in our devices, automatically pull together multiple sources of information, and even offer rewards to consumers.
 
 What is the blockchain again?
 
 Think of the blockchain as a kind of a public spreadsheet. This spreadsheet is stored simultaneously on a bunch of different computers and is encrypted.