https://blog.wongcw.com/2018/12/04/%e8%98%8b%e6%9e%9cairdrop%e6%80%a7%e9%a8%b7%e6%93%be%e9%a0%bb%e7%99%bc%e7%b4%90%e7%b4%84%e5%b8%82%e6%93%ac%e7%ab%8b%e6%b3%95%e5%9a%b4%e6%87%b2/