It is very easy, as long as the community can associate your forum nickname with your masternode. You already told us that, you have a masternode badge, so we know your masternode's dash address. Knowing that, the community can easily do a hard fork of the blockchain, exclude your address from having 1000 dash in this new fork, and thus confiscate all your Dash. This is already done in ethereum case, where they confiscated all the eth that belonged to the hacker. Fortunately in ethereum case, a community supported the hacker, and thats how ethereum-classic appeared and the hacker still have his eth-classic. The hacker's financial sovereignty depended on community support. But in your case, and as long as you call this a challenge, you will be alone, no community will support you, and you will lose all your dash.
If you really mean that, I can ask the forum administrator to reveal your masternode address, then I can ask the development team to do the appropriate hard fork. I could also pay them 1000 dash for that, hoping they will agree to receive this amount to do this dirty job. But you dont serioulsy mean that, do you?
In the future the community will demand
a proof of individuality for every masternode owner. A masternode owner who has not a forum nickname and a masternode badge or alternatively prove his individuality in another way (captcha, meeting e.t.c), he will be declared as
suspect of being a spy, and all his dash will be confiscated. And you may say, thats impossible to force masternodes to prove their individuality. Well it isnt. As you already may know, someone can run a masternode without paying the collateral fee. In that case, he is an equal peer, with the only disadvantage that he does not receive the masternode payment. So the community may run many nodes like that, and when they overcome the number of the real masternodes, they can fork and leave the masternodes who refuse to prove their individuality alone. In fear of this hard fork, all the masternodes will prove their individuality.