You have extremely strong evidence that you have the right chain because artificial network partitions are implausibly expensive to maintain and very cheap to s

You have extremely strong evidence that you have the right chain because artificial network partitions are implausibly expensive to maintain and very cheap to subvert. The Alpha Centauri example is fair, and that does require a quasi-social process (everyone deciding to ignore the alien chain) to resolve. I say quasi-social because it doesn’t require any coordination or negotiation, but also isn’t fully automatic.