Investproxy.com administration addressed those members who are against seeing their usernames in the list of payment proof:
The payment proof page shown here: https://www.investproxy.com/payproof.php displays the full usernames. If you are not comfortable with the way your username is displayed there, please send us a new username and we will change it.
We felt that for transparency, the names should be displayed in full. However, we will be delighted to hear from you if you want the first 5 characters of the username taken and xxx added at the end. To send us your suggestions, please reply to this message or send your suggestion directly to firstname.lastname@example.org. Also by using our contact page.