I am no cryptocurrency expert, but my understanding is that the BTC really only has value because the BTC user base has formed a consensus that it does. I believe the vast majority of conscience human beings can agree that North Korea's (government's) recent actions and stance are dangerous and morally reprehensible.
Assuming that NK has channeled most of its BTC stash through a small number of wallets, and that most of them may be identified by NK's spending patterns, I think this is a good case for implementing "poisoned wallets" to render all BTC (or partial BTC) that left a verboten wallet after a given time stamp. This would work, of course, only for users that use the blacklist enabled version of the software... but I believe enough people find NK's position sufficiently dangerous to warrant adopting this alternative code base to at least GREATLY DEVALUE these "tainted" BTC. This type of change begs two interesting questions:
1) How are the list of poisoned wallets managed? On the micro level, I believe the choice of banned wallets should be up to the individual BTC user, but most users won't want to manage such a tedious list. I expect users would want to defer this responsibility to one or more "accusation bodies" each with their own accusation, conviction, poisoning and appeal processes, all blockchain protected (outside the BTC blockchain)... I expect users would sign up for these poisoning feeds in one of two groups: 1) organizations that uphold the users moral convictions, or 2) organizations that seek out a superset of poisoned wallets, for those that want to ensure any BTC they receive are untainted, and good for other transactions. I believe most users would be most interested in aggregators (#2), but enough users would also add original accusers (#1) to make such a system plausable.
2) Tainted BTCs wouldn't be completely valueless, as some users may still accept them, so differently tainted BTCs would trade at their own distinct prices, which may be an interesting opportunity for cryptocurrency exchange companies.
What do you think?