#Proof of authentication
Bitcointalk username: vutienthanh
Bitcointalk URL: https://bitcointalk.org/index.php?action=profile;u=1459870
ETH address: 0x5593df3cf29a42e342cb6cd920cb7ef4e0790e62
Content URL:

1 https://steemit.com/humancoin/@vutienthanh/humancoin-the-currency-of-kindness
2 https://bitnox.wordpress.com/2018/10/25/humancoin%e2%80%8a-%e2%80%8athe-currency-of-kindness/
3 https://golos.io/humancoin/@vutienthanh/humancoin-the-currency-of-kindness
4 https://www.minds.com/blog/view/902048606245257216
5 https://medium.com/@vutienthanhdhhh/humancoin-the-currency-of-kindness-e7146766122e