diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/experimental/publicMessages/PublicMessageEvent.kt b/quartz/src/main/java/com/vitorpamplona/quartz/experimental/publicMessages/PublicMessageEvent.kt
index f688b42df..a6d1e0b00 100644
--- a/quartz/src/main/java/com/vitorpamplona/quartz/experimental/publicMessages/PublicMessageEvent.kt
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/experimental/publicMessages/PublicMessageEvent.kt
@@ -28,6 +28,7 @@ import com.vitorpamplona.quartz.nip01Core.core.any
 import com.vitorpamplona.quartz.nip01Core.hints.PubKeyHintProvider
 import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
 import com.vitorpamplona.quartz.nip10Notes.BaseNoteEvent
+import com.vitorpamplona.quartz.nip19Bech32.entities.NProfile
 import com.vitorpamplona.quartz.nip19Bech32.pubKeyHints
 import com.vitorpamplona.quartz.nip19Bech32.pubKeys
 import com.vitorpamplona.quartz.nip31Alts.alt
@@ -59,6 +60,15 @@ class PublicMessageEvent(
 
     fun groupKeySet() = tags.mapNotNullTo(mutableSetOf(this.pubKey), ReceiverTag::parseKey)
 
+    fun groupKeySetWithoutOwner() = tags.mapNotNullTo(mutableSetOf(), ReceiverTag::parseKey) - this.pubKey
+
+    fun groupAsNProfileList(toRemove: Set<HexKey>) =
+        group().joinToString {
+            NProfile.create(it.pubKey, it.relayHint)
+        }
+
+    fun chatroomKey(user: HexKey) = groupKeySet() - user
+
     companion object {
         const val KIND = 24
         const val ALT_DESCRIPTION = "Public Message"