diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/participants/ParticipantHostActionsSheet.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/participants/ParticipantHostActionsSheet.kt
index 8c76c30b40..8ff9d05cbf 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/participants/ParticipantHostActionsSheet.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/participants/ParticipantHostActionsSheet.kt
@@ -37,7 +37,6 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
@@ -56,7 +55,6 @@ import com.vitorpamplona.quartz.nip01Core.tags.aTag.ATag
 import com.vitorpamplona.quartz.nip19Bech32.entities.NPub
 import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingSpaceEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ROLE
-import kotlinx.coroutines.launch
 
 /**
  * Per-participant context sheet (T2 #2). Always shows the
@@ -88,7 +86,6 @@ internal fun ParticipantHostActionsSheet(
     catalog: com.vitorpamplona.amethyst.commons.viewmodels.RoomSpeakerCatalog? = null,
 ) {
     val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
-    val scope = rememberCoroutineScope()
 
     val roomATag =
         ATag(
@@ -98,9 +95,13 @@ internal fun ParticipantHostActionsSheet(
             relay = null,
         )
 
+    // Go through accountViewModel.launchSigner so the broadcast runs on
+    // viewModelScope (survives onDismiss() removing the sheet from
+    // composition) and signer errors surface as toasts instead of being
+    // silently swallowed.
     fun broadcast(template: com.vitorpamplona.quartz.nip01Core.signers.EventTemplate<out com.vitorpamplona.quartz.nip01Core.core.Event>?) {
         template ?: return
-        scope.launch { runCatching { accountViewModel.account.signAndComputeBroadcast(template) } }
+        accountViewModel.launchSigner { accountViewModel.account.signAndComputeBroadcast(template) }
     }
 
     val targetUser =
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/stage/HandRaiseQueueSection.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/stage/HandRaiseQueueSection.kt
index 2d1421f82d..bfb741a6a5 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/stage/HandRaiseQueueSection.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/stage/HandRaiseQueueSection.kt
@@ -37,7 +37,6 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
@@ -53,7 +52,6 @@ import com.vitorpamplona.amethyst.ui.stringRes
 import com.vitorpamplona.amethyst.ui.theme.Size35dp
 import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingSpaceEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ROLE
-import kotlinx.coroutines.launch
 
 /**
  * Host-only queue of audience members whose latest kind-10312
@@ -96,7 +94,6 @@ internal fun HandRaiseQueueSection(
 
     if (hands.isEmpty()) return
 
-    val scope = rememberCoroutineScope()
     Column(modifier = modifier.fillMaxSize().padding(top = 12.dp)) {
         Text(
             text = stringRes(R.string.nest_hand_raise_queue_title),
@@ -112,9 +109,15 @@ internal fun HandRaiseQueueSection(
                     hand = hand,
                     accountViewModel = accountViewModel,
                     onApprove = {
-                        scope.launch {
+                        // launchSigner runs on viewModelScope (+ Dispatchers.IO)
+                        // and surfaces signer errors as toasts. Composition-scoped
+                        // alternatives get cancelled when this row leaves the tree:
+                        // approving flips `canSpeak()` true, the hand is filtered
+                        // out, and if it was the last hand the section disposes
+                        // entirely — killing the in-flight sign(...) before it ran.
+                        accountViewModel.launchSigner {
                             val template = RoomParticipantActions.setRole(event, hand.pubkey, ROLE.SPEAKER)
-                            template?.let { runCatching { accountViewModel.account.signAndComputeBroadcast(it) } }
+                            template?.let { accountViewModel.account.signAndComputeBroadcast(it) }
                         }
                     },
                 )