DAR ES SALAAM, May 1 -- THERE is a version of Tanzanias future that we often celebrate because we can see it. It is visible in highways stretching across regions, in the Standard Gauge Railway slicing through landscapes, in ports expanding and cities rising.

It is tangible, measurable and easy to point to with pride. But there is another Tanzania being built alongside it, quieter, less visible, yet far more intimate.

It lives in our phones, in government systems, in databases we will never see. It is built from something far more personal than steel or concrete.

It is built from our personal data. Every day, without much thought, we contribute to this invisible infrastructure.

When you buy electricity token (LUKU) through your phone, ...