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Holding gold in your hand, burning it with a lighter, biting into it, smelling it, tasting it with your tongue, exposing it to water, etc. are all very easy ways to decentrally and self-evidently verify it to be unique to everything else. X-Ray, chemical assays, are also cheap.
Cheap, easy, reliable: pick one. Far short of being good enough for typical retail transactions. Why coins were invented millennia ago. With modern spectroscopy could do better, but would have to redesign form factor of jewelry to be suitable for random sampling & quick spectro.
Consensus = vote . Democracies are a bad idea, especially when it comes to money. Gold's properties are hard coded into the organic ledger system that requires no power to maintain security.
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