A special event with kind `5`, meaning "deletion" is defined as having a list of one or more `e` tags, each referencing an event the author is requesting to be deleted.
Relays SHOULD delete or stop publishing any referenced events that have an identical `pubkey` as the deletion request. Clients SHOULD hide or otherwise indicate a deletion status for referenced events.
Relays SHOULD continue to publish/share the deletion events indefinitely, as clients may already have the event that's intended to be deleted. Additionally, clients SHOULD broadcast deletion events to other relays which don't have it.
Clients MAY choose to fully hide any events that are referenced by valid deletion events. This includes text notes, direct messages, or other yet-to-be defined event kinds. Alternatively, they MAY show the event along with an icon or other indication that the author has "disowned" the event. The `content` field MAY also be used to replace the deleted events' own content, although a user interface should clearly indicate that this is a deletion reason, not the original content.
A client MUST validate that each event `pubkey` referenced in the `e` tag of the deletion request is identical to the deletion request `pubkey`, before hiding or deleting any event. Relays can not, in general, perform this validation and should not be treated as authoritative.
Clients display the deletion event itself in any way they choose, e.g., not at all, or with a prominent notice.
## Relay Usage
Relays MAY validate that a deletion event only references events that have the same `pubkey` as the deletion itself, however this is not required since relays may not have knowledge of all referenced events.
## Deleting a Deletion
Publishing a deletion event against a deletion has no effect. Clients and relays are not obliged to support "undelete" functionality.
