I found proof that my account details were used by other user to participate in the campaign. I dont think this is the first time a case like this has happened. This will obviously harm many other users who dont participate in any bounty campaign because their account details are used to cheat.
What action should be taken for cases like this and who should we blame? I hope all of us users must be careful about the activities of other users who cheat with our account details.
My account details are used on the "Twitter Campaign" with spreadsheet number 67.
Please check the spreadsheet.
For all users who read this thread, please check the spreadsheet. Your account details may also be used by other user to participate in bounty.
Thanks to Davian144 for letting me know about cheater bounty hunter involving my account details via PM.