#Proof-of-authentication:
   •   Bitcointalk username:quyettuoi311
   •   Telegram username:@nguyentuoi12
   •   Twitter username:@anhquyendk
   •   Link to your tweet about Smart City Eco:https://twitter.com/anhquyendk/status/1005741229257129984
                                                                   https://twitter.com/anhquyendk/status/1005741176773738496
                                                                   https://twitter.com/anhquyendk/status/1005741050512543744
   •   Facebook:https://www.facebook.com/tuoi.nguyen.9231
   •   Link to your Facebook post about Smart City Eco:https://www.facebook.com/tuoi.nguyen.9231/posts/1513353922108395