On: Maybe Blockchain Really Does Have Magical Powers

[semi-extrinsic]

So you're saying blockchains prevent this because proof-of-work? I.e. that you literally can't run a Sybil attack, because the only way to impersonate N miners is to actually run N miners?

[wmf → semi-extrinsic]

Yes. (Modulo arguments about the definition of "blockchain".)