??? ??? ?? ??????? ?? ????????, ???? ????????? ???? ????-?????????? ?????? ??? ?? ???????? ???? ???????? ??? ????? ?? ???????? ??????????????? ???? ??? ???????? ??? ??? ?? ?????????.In September 2017, China banned ICOs to trigger abnormal return from copyright decreasing during announcement window. The liquidity improvements by banning ICOs in Chin