#Proof-of-authentication:
   •   Bitcointalk username: Tancolor84
   •   Telegram username: @tantruc84
   •   Twitter username: @vutan09841
   •   Link to your tweet about Smart City Eco: https://twitter.com/vutan09841/status/1006556533134508032
   •   Facebook: https://www.facebook.com/tan.vudang.372
   •   Link to your Facebook post about Smart City Eco: https://www.facebook.com/tan.vudang.372