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> These identifiers must fall into one of the following groups:
> 1. Publicly dereferencable URIs, such as HTTPS URIs, with their authority belonging to that of their originating server. (Publicly facing content SHOULD use HTTPS URIs).
> 2. An ID explicitly specified as the JSON null object, which implies an anonymous object (a part of its parent context)

ActivityPub
https://www.w3.org/TR/activitypub/#obj-id
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