A Singaporean start-up is looking to transform the face of Southeast Asia by building smart cities powered by blockchain technology – starting with an ambitious 100-hectare mixed-use development project in the heart of the Cambodian capital, Phnom Penh. Spanning residential homes, office buildings, shopping malls, schools, and a massive exhibition hall, the privately backed project by Limestone Network will affect 10,000 business tenants and a daily population of 190,000 people. The idea was…