Both celebrities had been paid to advertise the start-up Centra Tech and its initial coin offering (ICO), a process through which cryptocurrency tokens ...
source https://www.google.com/url?rct=j&sa=t&url=https://slate.com/technology/2018/11/dj-khaled-floyd-mayweather-fine-cryptocurrency-promotion.html&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNEw5lcXJRY25bFd5eo_eNZrBNw4kA
