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Like a cryptographic "vouch/trust" chain? I trust you, you trust someone else, then I at least know there's a second order of connection/trust.
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I haven't seen one yet that fundamentally worked. Even before crypto, you had things like reddit karma or upvoting on digg or whatever else. However in the end those still boil down to a social or techno-social "contract"/system. I've not yet seen any system that manages to boil that down to some objective metric, and also still work.
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I don't think there ever will be a perfect trust system, because ultimately everything can be gamed, or politics/power can overrule the logic that runs the rules of the trust game. But even so, something that can be applied for _some_ period of time, with _some_ semblance of stability, and _some_ epistemic utility value to the real world is still worth trying to pursue.
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