These promissory notes, with no intrinsic value, forced people to deal with the concept of attestation-certifying that something is genuine.

没有固定价值的期票迫使人们接受证据的概念——证明某财物的真实性。

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And as Kai Bird notes here, it might even be a genuine opportunity.

正如凯•伯德所说，这可能是一个真正的机会。

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His notes were the genuine article.

他的钞票是实实在在的真货。

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Simple but genuine thank-yous or small, handwritten notes of appreciation can mean the world to people.

FORBES: Your Most Powerful Forgotten Weapon: Gratitude