Diablo 2 trading system

Ok here goes. I played D2, 20 somewhat years ago. For that matter I played original D1 before that. But what I wanna say is, for here and now D2 resurrected, I wonder about codes for items identification from blizzard for when new items will be created in the matrix of the game.
What I fear are finally are dupes… I dont want to be banned from the game if I buy an item ,in game, that is an unknowingly a dupe that was created by a 3rd party and traded ,legitimately, in game.
Are items that will be created, by the ton, will be a guarantee bonified none dupe?