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Interesting question asked at #Zcon: if someone *does* hack the ZK-SNARK scheme and print some fake coins, how should that be handled?

I see three options...
1. If N coins go into the z-address pool, N coins can come out, everyone withdraws at 1:1, except the unlucky last ones.
2. If N coins go into the z-address pool, C fakes created, N come out, everyone withdraws N/(N+C)
3. The C fake coins are accepted.
(1) seems like a more chaotic version of (2) that leads to a bank run, so (2) is better than (1). But (2) penalizes z-address use, and given that privacy is partially a public good this seems like a bad idea. (3) penalizes everyone equally.
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