For a signal between two adversaries to be credible, it must

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For a signal to be credible, it must be costly to fake or duplicate. This means that the signal should require significant effort or resources to produce, making it highly unlikely that an adversary would be able to replicate it. Verification by a third party, being part of a sequence of transactions, and having a good news-bad news component can all enhance the credibility of a signal, but they are not essential requirements.

For a Signal Between Two Adversaries to Be Credible, It