Fukuda, a software engineer at Next Currency Inc, poses for a photo after an interview with Reuters at the company's headquarters in Tokyo

Fukuda, a software engineer at Next Currency Inc, poses for a photo after an interview with Reuters at the company’s headquarters in Tokyo

Ryo Fukuda, a Japanese blockchain software engineer, in Tokyo in March 2018. Photo: Reuters / Toru Hanai

April 9, 2018 5:53 PM (UTC+8)