A Privacy-Preserving Enforced Bill Collection System using Smart Contracts. - Tomoki Fujitani; Keita Emura; Kazumasa Omote (AsiaJCIS, 2021)

An Anonymous Trust-Marking Scheme on Blockchain Systems. - Teppei Sato; Keita Emura; Tomoki Fujitani; Kazumasa Omote (IEEE Access, 2021)