Electronic signature. To be an anchor, you need to be over 18 years old, otherwise you are not allowed to broadcast live. 18 years old and above, need electronic signature, so it is electronic signature. Mile by mile (Nasdaq: BILI；; ; Mile Mile (English name: Mile Mile Mile) is now a cultural community platform where young people in China gather. The website was established on June 26, 2009, and was affectionately called "Mile Mile" by fans.