This is not a project by UNICEF, instead some people are using UNICEF's name to mine cryptos. Here are some proofs to it:
1) Visit the Unicef France official twitter account (verified):
https://www.youtube.com/user/unicefenfrancais2) Visit the site linked there.
3) Go to the bottom of page and click the youtube icon.
4) You will get this youtube page:
https://www.youtube.com/user/unicefenfrancais5) The Youtube page given on these news sites is a fake one, even though it has more subscribers:
https://www.youtube.com/channel/UCgC7E2YoTgUytC5IdFScqfQ6) Also the site where you can mine cryptos for UNICEF is not a sub-part of UNICEF website, but entirely different site.
https://www.chaingers.io/en/index.html7) Clicking the Unicef logo on this site does not take you to UNICEF's site.
So I guess it would be unwise to support such scam projects. It is not from UNICEF. Scam attempts like this is what gives crypto-currencies a bad name.