I did not plagiarize, but I am the owner of the account in the other forum and it is natural that my writing here in this forum is similar to my response there in the other forum and I can prove in any way you want that account belongs to me.
If you are really the owner of that that you should be able to edit that post from cryptotalk and add some info like link to your salamstar account, and stating that you posted the same text on bitcointalk, or something along those lines. In that case, you might have chance to remove the ban.
Recently there was a similar case,
Incorrect ban for plagiarism - I copied my own text and from what I can see, it shill haven;t been resolved even though OP proved that he is behind the original content.