Just as cryptocurrency is permissionless and trustless, so is gold. As long as gold money is used by weight rather than currency amount, any gold coin can be used as payment regardless of location. Just as cryptocurrency can be verified and authenticated, gold content can be tested to ensure content and purity.
The safest way to invest in precious metals is at the micro level: local coin dealers. Some people are more comfortable purchasing gold online than others, and that's OK, too; for those not so comfortable doing that, the brick and mortar shop is still the way to go.
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