These bars were recorded by the seller when they were dispatched: what is stamped on each bar and its measured weight. Each record is sealed on the public Solana blockchain, and you can check every one yourself.
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It checks the record, not the gold. A sealed record shows these details were recorded when the bars left the seller and have not been changed since. It does not show that a bar in front of you is genuine, or that the person showing it owns it. Have a bar tested before you pay for it.