How blockchains could save us from another Flint-like contamination crisis

GUEST: After the city of Flint, Michigan, temporarily switched water sources in 2014, residents began to develop unusual medical conditions. The city later learned the water was contaminated with high levels of lead and other toxins. Flint has a population of over 100,000. At first, state and city officials, including the Michigan Department of Health and Human Services, refuted the discovery and reassured residents the city water was safe for drinking. Official defenses fell only after citizens