Everyone talking about REPLAY PROTECTION is wasting their time. Can't replay on SV what wasn't played on ABC. What people need to look into is PLAY PROTECTION, where SV play what you thought you played on ABC - loser.
What I mean by that is the best PLAY PROTECTION is to not do any transactions. You'll make a "DSV" TX on ABC and C&C will sweep it up and play it (for your loss) on NV. ABC rolls back.