#Proof-of-authentication:
   •   Bitcointalk username: lybatrong155
   •   Telegram username: @LyTrong
   •   Twitter username: @Lbtrng1
   •   Link to your tweet about Smart City Eco: https://twitter.com/Lbtrng1/status/1009283678235602944
   •   Facebook: https://www.facebook.com/LyAnhKietXuat
   •   Link to your Facebook post about Smart City Eco: https://www.facebook.com/LyAnhKietXuat/posts/947920182047059