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I suspect they’re referring to using blockchain as a system of cryptographically-verified facts and shared reality to counteract the AI risk you mention. Why

• EGreg 3y ago
  It was flagged because it's a taboo on HN to say anything good about Web3, or even that Web3 is not as bad as something else, like AI that will destroy our trust in anything digital. The point was that Web3 was mildly zero-sum for society, while AI is shaping up to be massively negative-sum, as more people get access to it. It's like giving bombs to everybody and hoping no one will use them in bad ways. At least with nuclear bombs we knew who was enriching the plutonium. Here, everyone has access to weapons, to be used as they please. The key to when things go bad is swarms. When HN is overrun with swarms of bots a few years from now, you'll remember reading this. Web3 by contrast is just an immutable ledger, its worst applications are convincing people to voluntarily put some money into a buggy smart contract.