what is the “Is Reshuffled” property?

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The “Is Reshuffled” property in Mixpanel, represented as $is_reshuffled, is an internal property used to denote that an event was reshuffled—specifically, it is set to true if the original $distinct_id was updated due to identity merging. This property is relevant in both the Original ID Merge and Simplified ID Merge systems, helping track when an event’s $distinct_id has changed as a result of identity merging processes. You can find more details about this property in the Mixpanel documentation on reserved event properties here.

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I'm sorry, but the knowledge sources do not explicitly state that the $is_reshuffled property can be used to determine if a user has already signed up previously. The documentation only describes $is_reshuffled as an internal property set to true when an event’s original $distinct_id was updated due to identity merging, but it does not mention its use for tracking user sign-up status or history. Therefore, I cannot confirm that this property should be used for that purpose based on the available information Reserved Event Properties.

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