Casper Cheng Tsz-chun, 16, a Bitcoin enthusiast, poses for a photo at SCMP studio, Causeway Bay on Dec. 18, 2013. Photo: SCMP/Thomas Yau
Casper Cheng Tsz-chun, 16, a Bitcoin enthusiast, poses for a photo at SCMP studio, Causeway Bay on Dec. 18, 2013. Photo: SCMP/Thomas Yau