.................................. E-mail: masashi.une@boj.or.jp / /2019.7 127 1. crypto-asset 1 2 3 IP Genkin, Papadopoulos, and Papamanthou [2018] Henry, Herzberg, and Kate [2018] Khalilov and Levi [2018] IP .................................. 1 virtual currency crypto-currency Financial Stability Board Financial Stability Board [2018] 2 2018 3 Tziakouris [2018] 128 /2019.7 2 3 4 2. 1 unlinkabili