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Is there a single, opposite word to “alibi”?

Oxford Advanced Learner’s Dictionary defines “alibi” as 1. evidence that proves that a person was in another place at the time of a crime and so could not have committed it. 2. an excuse for sth that you have done wrong.

Is there an opposite, single word (not like ‘evidence of presence’) to “alibi” denoting evidence that "positively" proves that a person was in the place at the time of an event taking place regardress whether it's associated with or not? For instance, I want to prove that I was "there" at a dinner party last night, not at another or other places.

P.S. I checked the list of past ‘Is there single word for xxx” questions. I didn’t find the same question. However if there is, I’m willing to delete this question.