"If I say that I'm in San Francisco, and I sign that [a cryptographically signed message], it's not necessarily a fact that I'm in San Francisco, but it is a fact that I said that I was in San Francisco.
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"If I say that I'm in San Francisco, and I sign that [a cryptographically signed message], it's not necessarily a fact that I'm in San Francisco, but it is a fact that I said that I was in San Francisco.