[setr]

Retroactively?

In this system, no transaction is actually final, because it can always be rollbacked because the reversal of a law can traverse time and space. The only gaurantee is once you've got it converted to cash (exited the network) because the network may simply enter a parallel universe where the law never existed (and unlike a hostile government invading another, with all the repurcussions of it, this is a manuever taken by the existing government, and likely it remains the government in the new universe).

This isn't a law then, its simply a communally accepted rule; if the ratchet turns, and community decides slavery is no longer acceptable, then it'll be applied retroactively and you'll be rendered an illegal actor for operating legally at the time of operation, despite operating legally now (no longer dealing in slaves).