diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
index 47580cabf..c5c576b4a 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
@@ -179,6 +179,8 @@ import com.vitorpamplona.quartz.nip90Dvms.NIP90UserDiscoveryResponseEvent
 import com.vitorpamplona.quartz.nip94FileMetadata.FileHeaderEvent
 import com.vitorpamplona.quartz.nip96FileStorage.config.FileServersEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 import com.vitorpamplona.quartz.nipB7Blossom.BlossomServersEvent
 import com.vitorpamplona.quartz.utils.Hex
 import com.vitorpamplona.quartz.utils.LargeCache
@@ -599,6 +601,18 @@ object LocalCache : ILocalCache {
         wasVerified: Boolean,
     ) = consumeRegularEvent(event, relay, wasVerified)
 
+    fun consume(
+        event: VoiceEvent,
+        relay: NormalizedRelayUrl?,
+        wasVerified: Boolean,
+    ) = consumeRegularEvent(event, relay, wasVerified)
+
+    fun consume(
+        event: VoiceReplyEvent,
+        relay: NormalizedRelayUrl?,
+        wasVerified: Boolean,
+    ) = consumeRegularEvent(event, relay, wasVerified)
+
     @Suppress("DEPRECATION")
     fun consume(
         event: TorrentCommentEvent,
@@ -2816,6 +2830,8 @@ object LocalCache : ILocalCache {
                 is TrustedRelayListEvent -> consume(event, relay, wasVerified)
                 is VideoHorizontalEvent -> consume(event, relay, wasVerified)
                 is VideoVerticalEvent -> consume(event, relay, wasVerified)
+                is VoiceEvent -> consume(event, relay, wasVerified)
+                is VoiceReplyEvent -> consume(event, relay, wasVerified)
                 is WikiNoteEvent -> consume(event, relay, wasVerified)
                 else -> {
                     Log.w("Event Not Supported", event.toJson())
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/RenderVideoPlayer.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/RenderVideoPlayer.kt
index 458ad57f4..1a9e66706 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/RenderVideoPlayer.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/RenderVideoPlayer.kt
@@ -40,7 +40,6 @@ import com.vitorpamplona.amethyst.service.playback.composable.controls.RenderCon
 import com.vitorpamplona.amethyst.service.playback.composable.mediaitem.LoadedMediaItem
 import com.vitorpamplona.amethyst.service.playback.composable.wavefront.Waveform
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
-import com.vitorpamplona.quartz.experimental.audio.header.tags.WaveformTag
 
 @Composable
 @OptIn(UnstableApi::class)
@@ -50,7 +49,7 @@ fun RenderVideoPlayer(
     thumbData: VideoThumb?,
     showControls: Boolean = true,
     contentScale: ContentScale,
-    waveform: WaveformTag? = null,
+    waveform: WaveformData? = null,
     borderModifier: Modifier,
     videoModifier: Modifier,
     onControllerVisibilityChanged: ((Boolean) -> Unit)? = null,
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoView.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoView.kt
index 011d82504..8b31f9892 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoView.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoView.kt
@@ -28,6 +28,7 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Immutable
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
@@ -42,9 +43,13 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.theme.Size75dp
 import com.vitorpamplona.amethyst.ui.theme.imageModifier
 import com.vitorpamplona.amethyst.ui.theme.videoGalleryModifier
-import com.vitorpamplona.quartz.experimental.audio.header.tags.WaveformTag
 import com.vitorpamplona.quartz.nip94FileMetadata.tags.DimensionTag
 
+@Immutable
+class WaveformData(
+    val wave: List<Int>,
+)
+
 @Composable
 fun VideoView(
     videoUri: String,
@@ -54,7 +59,7 @@ fun VideoView(
     roundedCorner: Boolean,
     gallery: Boolean = false,
     contentScale: ContentScale,
-    waveform: WaveformTag? = null,
+    waveform: WaveformData? = null,
     artworkUri: String? = null,
     authorName: String? = null,
     dimensions: DimensionTag? = null,
@@ -85,7 +90,7 @@ fun VideoView(
     thumb: VideoThumb? = null,
     borderModifier: Modifier,
     contentScale: ContentScale,
-    waveform: WaveformTag? = null,
+    waveform: WaveformData? = null,
     artworkUri: String? = null,
     authorName: String? = null,
     dimensions: DimensionTag? = null,
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoViewInner.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoViewInner.kt
index 61eac519f..03aca3d3d 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoViewInner.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/VideoViewInner.kt
@@ -29,7 +29,6 @@ import androidx.compose.ui.layout.ContentScale
 import com.vitorpamplona.amethyst.service.playback.composable.mainVideo.VideoPlayerActiveMutex
 import com.vitorpamplona.amethyst.service.playback.composable.mediaitem.GetMediaItem
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
-import com.vitorpamplona.quartz.experimental.audio.header.tags.WaveformTag
 
 public val DEFAULT_MUTED_SETTING = mutableStateOf(true)
 
@@ -43,7 +42,7 @@ fun VideoViewInner(
     showControls: Boolean = true,
     contentScale: ContentScale,
     borderModifier: Modifier,
-    waveform: WaveformTag? = null,
+    waveform: WaveformData? = null,
     artworkUri: String? = null,
     authorName: String? = null,
     nostrUriCallback: String? = null,
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/wavefront/Waveform.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/wavefront/Waveform.kt
index 3307cbf99..c0ef0c865 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/wavefront/Waveform.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/playback/composable/wavefront/Waveform.kt
@@ -38,15 +38,15 @@ import androidx.media3.common.Player
 import androidx.media3.session.MediaController
 import com.linc.audiowaveform.infiniteLinearGradient
 import com.vitorpamplona.amethyst.service.playback.composable.MediaControllerState
+import com.vitorpamplona.amethyst.service.playback.composable.WaveformData
 import com.vitorpamplona.amethyst.ui.components.AudioWaveformReadOnly
-import com.vitorpamplona.quartz.experimental.audio.header.tags.WaveformTag
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.conflate
 import kotlinx.coroutines.flow.flow
 
 @Composable
 fun Waveform(
-    waveform: WaveformTag,
+    waveform: WaveformData,
     mediaControllerState: MediaControllerState,
     modifier: Modifier,
 ) {
@@ -94,7 +94,7 @@ private fun pollCurrentDuration(controller: MediaController) =
 
 @Composable
 fun DrawWaveform(
-    waveform: WaveformTag,
+    waveform: WaveformData,
     waveformProgress: MutableFloatState,
     modifier: Modifier,
 ) {
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/VoiceTrack.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/VoiceTrack.kt
new file mode 100644
index 000000000..523314093
--- /dev/null
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/VoiceTrack.kt
@@ -0,0 +1,105 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.ui.note.types
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.unit.dp
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.playback.composable.VideoView
+import com.vitorpamplona.amethyst.service.playback.composable.WaveformData
+import com.vitorpamplona.amethyst.ui.navigation.navs.INav
+import com.vitorpamplona.amethyst.ui.note.elements.DisplayUncitedHashtags
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+import com.vitorpamplona.quartz.nip01Core.tags.hashtags.hasHashtags
+import com.vitorpamplona.quartz.nip14Subject.subject
+import com.vitorpamplona.quartz.nipA0VoiceMessages.BaseVoiceEvent
+
+@Composable
+fun RenderVoiceTrack(
+    note: Note,
+    contentScale: ContentScale,
+    accountViewModel: AccountViewModel,
+    nav: INav,
+) {
+    val noteEvent = note.event as? BaseVoiceEvent ?: return
+
+    AudioVoiceHeader(noteEvent, note, contentScale, accountViewModel, nav)
+}
+
+@Composable
+fun AudioVoiceHeader(
+    noteEvent: BaseVoiceEvent,
+    note: Note,
+    contentScale: ContentScale,
+    accountViewModel: AccountViewModel,
+    nav: INav,
+) {
+    val waveform =
+        remember(noteEvent) {
+            noteEvent
+                .iMetaTags()
+                .firstOrNull()
+                ?.waveform
+                ?.let { WaveformData(it) }
+        }
+    val media =
+        remember(noteEvent) {
+            noteEvent.content.ifBlank { null } ?: noteEvent.iMetaTags().firstOrNull()?.url
+        }
+
+    if (media == null) return
+
+    Column(modifier = Modifier.fillMaxWidth().padding(top = 5.dp), horizontalAlignment = Alignment.CenterHorizontally) {
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            VideoView(
+                videoUri = media,
+                mimeType = null,
+                waveform = waveform,
+                title = noteEvent.subject(),
+                authorName = note.author?.toBestDisplayName(),
+                roundedCorner = true,
+                contentScale = contentScale,
+                accountViewModel = accountViewModel,
+                nostrUriCallback = note.toNostrUri(),
+            )
+        }
+
+        val callbackUri = remember(note) { note.toNostrUri() }
+
+        if (noteEvent.hasHashtags()) {
+            Row(Modifier.fillMaxWidth(), verticalAlignment = Alignment.CenterVertically) {
+                DisplayUncitedHashtags(noteEvent, callbackUri, accountViewModel, nav)
+            }
+        }
+    }
+}
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeConversationsFeedFilter.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeConversationsFeedFilter.kt
index 5c940a8fa..0ff7d6fab 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeConversationsFeedFilter.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeConversationsFeedFilter.kt
@@ -34,6 +34,7 @@ import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
 import com.vitorpamplona.quartz.nip22Comments.CommentEvent
 import com.vitorpamplona.quartz.nip28PublicChat.message.ChannelMessageEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.chat.LiveActivitiesChatMessageEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 
 class HomeConversationsFeedFilter(
     val account: Account,
@@ -79,6 +80,7 @@ class HomeConversationsFeedFilter(
                 event is PollNoteEvent ||
                 event is ChannelMessageEvent ||
                 event is CommentEvent ||
+                event is VoiceReplyEvent ||
                 event is LiveActivitiesChatMessageEvent
         ) &&
             filterParams.match(event)
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeNewThreadFeedFilter.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeNewThreadFeedFilter.kt
index e5a0441fe..806516e96 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeNewThreadFeedFilter.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/dal/HomeNewThreadFeedFilter.kt
@@ -40,6 +40,7 @@ import com.vitorpamplona.quartz.nip23LongContent.LongTextNoteEvent
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
 
 class HomeNewThreadFeedFilter(
     val account: Account,
@@ -100,6 +101,7 @@ class HomeNewThreadFeedFilter(
                 noteEvent is InteractiveStoryPrologueEvent ||
                 noteEvent is CommentEvent ||
                 noteEvent is AudioTrackEvent ||
+                noteEvent is VoiceEvent ||
                 noteEvent is AudioHeaderEvent
         ) &&
             filterParams.match(noteEvent, it.relays) &&
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip01Core/FilterHomePostsByGeohashes.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip01Core/FilterHomePostsByGeohashes.kt
index 95a28c771..a5e07906d 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip01Core/FilterHomePostsByGeohashes.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip01Core/FilterHomePostsByGeohashes.kt
@@ -35,6 +35,8 @@ import com.vitorpamplona.quartz.nip23LongContent.LongTextNoteEvent
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 import kotlin.collections.flatten
 
 val HomePostsByGeohashKinds =
@@ -48,6 +50,8 @@ val HomePostsByGeohashKinds =
         InteractiveStoryPrologueEvent.KIND,
         WikiNoteEvent.KIND,
         CommentEvent.KIND,
+        VoiceEvent.KIND,
+        VoiceReplyEvent.KIND,
     )
 
 fun filterHomePostsByGeohashes(
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip01Core/FilterHomePostsByHashtags.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip01Core/FilterHomePostsByHashtags.kt
index b94679fb4..8e9eddd2b 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip01Core/FilterHomePostsByHashtags.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip01Core/FilterHomePostsByHashtags.kt
@@ -37,6 +37,8 @@ import com.vitorpamplona.quartz.nip23LongContent.LongTextNoteEvent
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 
 val HomePostsBuHashtagsKinds =
     listOf(
@@ -50,6 +52,8 @@ val HomePostsBuHashtagsKinds =
         InteractiveStoryPrologueEvent.KIND,
         CommentEvent.KIND,
         WikiNoteEvent.KIND,
+        VoiceEvent.KIND,
+        VoiceReplyEvent.KIND,
     )
 
 fun filterHomePostsByHashtags(
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip65Follows/FilterHomePostsByAuthors.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip65Follows/FilterHomePostsByAuthors.kt
index 80c915ead..b9de07388 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip65Follows/FilterHomePostsByAuthors.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/datasource/nip65Follows/FilterHomePostsByAuthors.kt
@@ -40,6 +40,8 @@ import com.vitorpamplona.quartz.nip53LiveActivities.streaming.LiveActivitiesEven
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 import kotlin.math.max
 
 val HomePostsNewThreadKinds =
@@ -61,6 +63,8 @@ val HomePostsConversationKinds =
         CommentEvent.KIND,
         LiveActivitiesEvent.KIND,
         EphemeralChatEvent.KIND,
+        VoiceEvent.KIND,
+        VoiceReplyEvent.KIND,
     )
 
 fun filterNewHomePostsByAuthors(
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/threadview/ThreadFeedView.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/threadview/ThreadFeedView.kt
index ae82881ca..63861a764 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/threadview/ThreadFeedView.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/threadview/ThreadFeedView.kt
@@ -229,6 +229,7 @@ import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip89AppHandlers.definition.AppDefinitionEvent
 import com.vitorpamplona.quartz.nip94FileMetadata.FileHeaderEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.BaseVoiceEvent
 import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
@@ -547,6 +548,8 @@ private fun FullBleedNoteCompose(
                     VideoDisplay(baseNote, makeItShort = false, canPreview = true, backgroundColor = backgroundColor, ContentScale.FillWidth, accountViewModel = accountViewModel, nav = nav)
                 } else if (noteEvent is PictureEvent) {
                     PictureDisplay(baseNote, roundedCorner = true, ContentScale.FillWidth, PaddingValues(vertical = Size5dp), backgroundColor, accountViewModel = accountViewModel, nav)
+                } else if (noteEvent is BaseVoiceEvent) {
+                    VoiceEventDisplay(baseNote, makeItShort = false, canPreview = true, backgroundColor = backgroundColor, ContentScale.FillWidth, accountViewModel = accountViewModel, nav = nav)
                 } else if (noteEvent is FileHeaderEvent) {
                     FileHeaderDisplay(baseNote, roundedCorner = true, ContentScale.FillWidth, accountViewModel = accountViewModel)
                 } else if (noteEvent is FileStorageHeaderEvent) {
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/EventFactory.kt b/quartz/src/main/java/com/vitorpamplona/quartz/EventFactory.kt
index 2a0fa369e..82a941199 100644
--- a/quartz/src/main/java/com/vitorpamplona/quartz/EventFactory.kt
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/EventFactory.kt
@@ -125,6 +125,8 @@ import com.vitorpamplona.quartz.nip94FileMetadata.FileHeaderEvent
 import com.vitorpamplona.quartz.nip96FileStorage.config.FileServersEvent
 import com.vitorpamplona.quartz.nip98HttpAuth.HTTPAuthorizationEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 import com.vitorpamplona.quartz.nipB7Blossom.BlossomAuthorizationEvent
 import com.vitorpamplona.quartz.nipB7Blossom.BlossomServersEvent
 
@@ -282,6 +284,8 @@ class EventFactory {
                 TrustedRelayListEvent.KIND -> TrustedRelayListEvent(id, pubKey, createdAt, tags, content, sig)
                 VideoHorizontalEvent.KIND -> VideoHorizontalEvent(id, pubKey, createdAt, tags, content, sig)
                 VideoVerticalEvent.KIND -> VideoVerticalEvent(id, pubKey, createdAt, tags, content, sig)
+                VoiceEvent.KIND -> VoiceEvent(id, pubKey, createdAt, tags, content, sig)
+                VoiceReplyEvent.KIND -> VoiceReplyEvent(id, pubKey, createdAt, tags, content, sig)
                 WikiNoteEvent.KIND -> WikiNoteEvent(id, pubKey, createdAt, tags, content, sig)
                 else -> {
                     factories[kind]?.build(id, pubKey, createdAt, tags, content, sig)
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/AudioMeta.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/AudioMeta.kt
new file mode 100644
index 000000000..c74d41ff6
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/AudioMeta.kt
@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages
+
+import com.vitorpamplona.quartz.nip92IMeta.IMetaTag
+import com.vitorpamplona.quartz.nip92IMeta.IMetaTagBuilder
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.WaveformTag
+
+data class AudioMeta(
+    val url: String,
+    val hash: String? = null,
+    val duration: Int? = null,
+    val waveform: List<Int>? = null,
+) {
+    fun toIMetaArray(): Array<String> =
+        IMetaTagBuilder(url)
+            .apply {
+                hash?.let { hash(it) }
+                duration?.let { duration(it) }
+                waveform?.let { waveform(it) }
+            }.build()
+            .toTagArray()
+
+    companion object {
+        fun parse(iMeta: IMetaTag): AudioMeta =
+            AudioMeta(
+                iMeta.url,
+                iMeta.hash()?.firstOrNull(),
+                iMeta.duration()?.firstOrNull()?.toIntOrNull(),
+                iMeta.waveform()?.firstOrNull()?.let { WaveformTag.parseWave(it) },
+            )
+    }
+}
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/BaseVoiceEvent.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/BaseVoiceEvent.kt
new file mode 100644
index 000000000..6fb98c5b9
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/BaseVoiceEvent.kt
@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.Event
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip31Alts.alt
+import com.vitorpamplona.quartz.nip92IMeta.imetas
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+open class BaseVoiceEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    kind: Int,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
+    fun iMetaTags() = imetas().map { AudioMeta.parse(it) }
+
+    companion object {
+        fun <T : BaseVoiceEvent> build(
+            voiceMessage: AudioMeta,
+            kind: Int,
+            alt: String,
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<T>.() -> Unit = {},
+        ) = eventTemplate(kind, voiceMessage.url, createdAt) {
+            alt(alt)
+            initializer()
+        }
+    }
+}
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/IMetaTagBuilderExt.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/IMetaTagBuilderExt.kt
new file mode 100644
index 000000000..226d110ec
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/IMetaTagBuilderExt.kt
@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages
+
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip92IMeta.IMetaTagBuilder
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.DurationTag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.HashSha256Tag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.WaveformTag
+
+/**
+ * Contains the IMeta tags that are used by Picture events.
+ */
+fun IMetaTagBuilder.hash(hash: HexKey) = add(HashSha256Tag.TAG_NAME, hash)
+
+fun IMetaTagBuilder.duration(size: Int) = add(DurationTag.TAG_NAME, size.toString())
+
+fun IMetaTagBuilder.waveform(wave: List<Int>) = add(WaveformTag.TAG_NAME, WaveformTag.assembleWave(wave))
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/IMetaTagExt.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/IMetaTagExt.kt
new file mode 100644
index 000000000..d65ab34e9
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/IMetaTagExt.kt
@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages
+
+import com.vitorpamplona.quartz.nip92IMeta.IMetaTag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.DurationTag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.HashSha256Tag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.WaveformTag
+
+fun IMetaTag.hash() = properties.get(HashSha256Tag.TAG_NAME)
+
+fun IMetaTag.duration() = properties.get(DurationTag.TAG_NAME)
+
+fun IMetaTag.waveform() = properties.get(WaveformTag.TAG_NAME)
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/TagArrayBuilderExt.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/TagArrayBuilderExt.kt
new file mode 100644
index 000000000..1854a71bf
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/TagArrayBuilderExt.kt
@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip94FileMetadata.tags.HashSha256Tag
+
+fun <T : BaseVoiceEvent> TagArrayBuilder<T>.audioIMeta(
+    url: String,
+    hash: String? = null,
+    duration: Int? = null,
+    waveform: List<Int>? = null,
+) = audioIMeta(AudioMeta(url, hash, duration, waveform))
+
+fun <T : BaseVoiceEvent> TagArrayBuilder<T>.audioIMeta(imeta: AudioMeta): TagArrayBuilder<T> {
+    add(imeta.toIMetaArray())
+    imeta.hash?.let { add(HashSha256Tag.assemble(it)) }
+    return this
+}
+
+fun <T : BaseVoiceEvent> TagArrayBuilder<T>.audioIMeta(audioUrls: List<AudioMeta>): TagArrayBuilder<T> {
+    audioUrls.forEach { audioIMeta(it) }
+    return this
+}
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/VoiceEvent.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/VoiceEvent.kt
new file mode 100644
index 000000000..a43185712
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/VoiceEvent.kt
@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class VoiceEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseVoiceEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    companion object {
+        const val KIND = 1222
+        const val ALT_DESCRIPTION = "Voice message"
+
+        fun build(
+            voiceMessage: AudioMeta,
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<VoiceEvent>.() -> Unit = {},
+        ) = build(voiceMessage, KIND, ALT_DESCRIPTION, createdAt, initializer)
+    }
+}
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/VoiceReplyEvent.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/VoiceReplyEvent.kt
new file mode 100644
index 000000000..5d43098cd
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/VoiceReplyEvent.kt
@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class VoiceReplyEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseVoiceEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    companion object {
+        const val KIND = 1244
+        const val ALT_DESCRIPTION = "Voice reply"
+
+        fun build(
+            voiceMessage: AudioMeta,
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<VoiceReplyEvent>.() -> Unit = {},
+        ) = build(voiceMessage, KIND, ALT_DESCRIPTION, createdAt, initializer)
+    }
+}
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/DurationTag.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/DurationTag.kt
new file mode 100644
index 000000000..af56d81f2
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/DurationTag.kt
@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class DurationTag {
+    companion object {
+        const val TAG_NAME = "duration"
+
+        @JvmStatic
+        fun parse(tag: Array<String>): Int? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1].toIntOrNull()
+        }
+
+        @JvmStatic
+        fun assemble(seconds: Int) = arrayOf(TAG_NAME, seconds.toString())
+    }
+}
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/HashSha256Tag.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/HashSha256Tag.kt
new file mode 100644
index 000000000..9f42b8ad7
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/HashSha256Tag.kt
@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class HashSha256Tag {
+    companion object {
+        const val TAG_NAME = "sha256"
+
+        @JvmStatic
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        @JvmStatic
+        fun assemble(hash: String) = arrayOf(TAG_NAME, hash)
+    }
+}
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/WaveformTag.kt b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/WaveformTag.kt
new file mode 100644
index 000000000..d4366fcba
--- /dev/null
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/WaveformTag.kt
@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class WaveformTag(
+    val wave: List<Int>,
+) {
+    fun toTagArray() = assemble(wave)
+
+    companion object {
+        const val TAG_NAME = "waveform"
+
+        @JvmStatic
+        fun parse(tag: Array<String>): WaveformTag? = parseWave(tag)?.let { WaveformTag(it) }
+
+        @JvmStatic
+        fun parseWave(tag: Array<String>): List<Int>? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+
+            val wave = tag[1].split(" ").mapNotNull { it.toIntOrNull() }
+            if (wave.isEmpty()) return null
+            return wave
+        }
+
+        fun parseWave(wave: String): List<Int>? {
+            val wave = wave.split(" ").mapNotNull { it.toIntOrNull() }
+            if (wave.isEmpty()) return null
+            return wave
+        }
+
+        @JvmStatic
+        fun assembleWave(wave: List<Int>) = wave.joinToString(" ")
+
+        @JvmStatic
+        fun assemble(wave: List<Int>) = arrayOf(TAG_NAME, assembleWave(wave))
+    }
+}