#Proof of Authentication

Bitcointalk username: Sapphire9
Article Campaign
Blog:
https://steemit.com/ico/@sapphire9/everest-identificacion-digital-en-el-blockchain
http://cryptoblogcentury.blogspot.com/2018/10/everest-identificacion-digital-en-el.html
https://cryptocoinpravda.com/everest-identificacion-digital-en-el-blockchain.html