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-NIP-27
-======
-
-Multicasting
-------------
-
-`draft` `optional` `author:cameri`
-
-A new tag `m` meaning `multicast group` allow for events to be addressed to a
-group of clients simultaneously. Multicast in this scenario can be one-to-many
-or many-to-many.
-
-A relay MUST forward events containing `m` tags strictly to clients subscribed
-with a tag filter `#m` containing at least one of the values of such tags and
-refrain from forwarding such events to clients without such filter. The value
-of an `m` tag is case-sensitive.
-
-A client SHOULD send events containing `m` tags only to relays that explicitly
-support NIP-27. A NIP-16 supporting client MAY test for the capability by
-subscribing twice to a relay with and without the tag filter `#m` respectively
-and sending an ephemeral event with a random `m` tag of equal value.
-
-## Events
-
-Clients targeting a multicast group MAY include an `m` tag with a value set to
-an arbitrary string representing the multicast group.
-
-Suppose that Alice wants to multicast an event to a very special multicast group
-that covers specific topics. The multicast group is identified by the following
-string: `00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048`
-
-Alice would construct the following message and sends it to her favorite relay
-which happens to support multicasting:
-
-```json
-[
-  "EVENT",
-  {
-    "id": "<id>",
-    "pubkey": "<Alice's pubkey>",
-    "created_at": 1231469640,
-    "content": "Let's get the conversation started",
-    "tags": [
-      ["m", "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048"],
-    ],
-    "sig": "<sig>"
-  }
-]
-```
-
-## Subscriptions
-
-Clients subscribing to a multicast group MUST include an `#m` tag filter with
-an array of multicast groups as values.
-
-Suppose that Bob and Charlie both share Alice's interest and would like to stay
-up to date. Both would construct the following message to subscribe:
-
-```
-[
-  "REQ",
-  "<subscriptionId>",
-  {
-    "#m": ["00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048"]
-  }
-]
-```