#Proof-of-authentication:
   •   Bitcointalk username: developerphp
   •   Telegram username: @polik88
   •   Twitter username: @PolishchykA
   •   Link to your tweet about Smart City Eco: https://twitter.com/PolishchykA/status/1007062675568852992
   •   Facebook: https://www.facebook.com/Polishchyk
   •   Link to your Facebook post about Smart City Eco: https://www.facebook.com/Polishchyk/posts/1851010841632432