Adds support for NIP-53 Meeting room to quartz

2025-09-20 09:50:41 +02:00 · 2025-09-04 11:10:54 -04:00
parent fcef6df7db
commit 103ef01be4
18 changed files with 1130 additions and 10 deletions
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/EventFactory.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/EventFactory.kt
@@ -93,6 +93,9 @@ import com.vitorpamplona.quartz.nip52Calendar.CalendarEvent
 import com.vitorpamplona.quartz.nip52Calendar.CalendarRSVPEvent
 import com.vitorpamplona.quartz.nip52Calendar.CalendarTimeSlotEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.chat.LiveActivitiesChatMessageEvent
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingRoomEvent
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingSpaceEvent
+import com.vitorpamplona.quartz.nip53LiveActivities.presence.MeetingRoomPresenceEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.LiveActivitiesEvent
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
 import com.vitorpamplona.quartz.nip56Reports.ReportEvent
@@ -253,6 +256,9 @@ class EventFactory {
                LnZapPrivateEvent.KIND -> LnZapPrivateEvent(id, pubKey, createdAt, tags, content, sig)
                LnZapRequestEvent.KIND -> LnZapRequestEvent(id, pubKey, createdAt, tags, content, sig)
                LongTextNoteEvent.KIND -> LongTextNoteEvent(id, pubKey, createdAt, tags, content, sig)
+                MeetingRoomEvent.KIND -> MeetingRoomEvent(id, pubKey, createdAt, tags, content, sig)
+                MeetingRoomPresenceEvent.KIND -> MeetingRoomPresenceEvent(id, pubKey, createdAt, tags, content, sig)
+                MeetingSpaceEvent.KIND -> MeetingSpaceEvent(id, pubKey, createdAt, tags, content, sig)
                MetadataEvent.KIND -> MetadataEvent(id, pubKey, createdAt, tags, content, sig)
                MuteListEvent.KIND -> MuteListEvent(id, pubKey, createdAt, tags, content, sig)
                NNSEvent.KIND -> NNSEvent(id, pubKey, createdAt, tags, content, sig)
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/MeetingRoomEvent.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/MeetingRoomEvent.kt
@@ -0,0 +1,161 @@
+/**
+ * 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.nip53LiveActivities.meetingSpaces
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.any
+import com.vitorpamplona.quartz.nip01Core.hints.AddressHintProvider
+import com.vitorpamplona.quartz.nip01Core.hints.EventHintProvider
+import com.vitorpamplona.quartz.nip01Core.hints.PubKeyHintProvider
+import com.vitorpamplona.quartz.nip01Core.hints.types.AddressHint
+import com.vitorpamplona.quartz.nip01Core.hints.types.EventIdHint
+import com.vitorpamplona.quartz.nip01Core.signers.NostrSigner
+import com.vitorpamplona.quartz.nip23LongContent.tags.ImageTag
+import com.vitorpamplona.quartz.nip23LongContent.tags.SummaryTag
+import com.vitorpamplona.quartz.nip23LongContent.tags.TitleTag
+import com.vitorpamplona.quartz.nip31Alts.AltTag
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.MeetingSpaceTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.CurrentParticipantsTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.EndsTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ParticipantTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.PinnedEventTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.RecordingTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.RelayListTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.StartsTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.StatusTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.StreamingTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.TotalParticipantsTag
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class MeetingRoomEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig),
+    EventHintProvider,
+    AddressHintProvider,
+    PubKeyHintProvider {
+    override fun eventHints(): List<EventIdHint> {
+        val pinnedEvents = pinned()
+        if (pinnedEvents.isEmpty()) return emptyList()
+
+        val relays = allRelayUrls()
+
+        return if (relays.isNotEmpty()) {
+            pinnedEvents
+                .map { eventId ->
+                    relays.map { relay ->
+                        EventIdHint(eventId, relay)
+                    }
+                }.flatten()
+        } else {
+            emptyList()
+        }
+    }
+
+    override fun linkedEventIds() = tags.mapNotNull(PinnedEventTag::parse)
+
+    override fun addressHints(): List<AddressHint> = tags.mapNotNull(MeetingSpaceTag::parseAsHint)
+
+    override fun linkedAddressIds(): List<String> = tags.mapNotNull(MeetingSpaceTag::parseAddressId)
+
+    override fun pubKeyHints() = tags.mapNotNull(ParticipantTag::parseAsHint)
+
+    override fun linkedPubKeys() = tags.mapNotNull(ParticipantTag::parseKey)
+
+    fun interactiveRoom() = tags.firstNotNullOfOrNull(MeetingSpaceTag::parse)
+
+    fun title() = tags.firstNotNullOfOrNull(TitleTag::parse)
+
+    fun summary() = tags.firstNotNullOfOrNull(SummaryTag::parse)
+
+    fun image() = tags.firstNotNullOfOrNull(ImageTag::parse)
+
+    fun streaming() = tags.firstNotNullOfOrNull(StreamingTag::parse)
+
+    fun recording() = tags.firstNotNullOfOrNull(RecordingTag::parse)
+
+    fun starts() = tags.firstNotNullOfOrNull(StartsTag::parse)
+
+    fun ends() = tags.firstNotNullOfOrNull(EndsTag::parse)
+
+    fun status() = checkStatus(tags.firstNotNullOfOrNull(StatusTag::parseEnum))
+
+    fun isLive() = status() == StatusTag.STATUS.LIVE
+
+    fun currentParticipants() = tags.firstNotNullOfOrNull(CurrentParticipantsTag::parse)
+
+    fun totalParticipants() = tags.firstNotNullOfOrNull(TotalParticipantsTag::parse)
+
+    fun participantKeys(): List<HexKey> = tags.mapNotNull(ParticipantTag::parseKey)
+
+    fun participants() = tags.mapNotNull(ParticipantTag::parse)
+
+    fun relays() = tags.mapNotNull(RelayListTag::parse).flatten()
+
+    fun allRelayUrls() = tags.mapNotNull(RelayListTag::parse).flatten()
+
+    fun hasHost() = tags.any(ParticipantTag::isHost)
+
+    fun host() = tags.firstNotNullOfOrNull(ParticipantTag::parseHost)
+
+    fun hosts() = tags.mapNotNull(ParticipantTag::parseHost)
+
+    fun pinned() = tags.mapNotNull(PinnedEventTag::parse)
+
+    fun checkStatus(eventStatus: StatusTag.STATUS?): StatusTag.STATUS? =
+        if (eventStatus == StatusTag.STATUS.LIVE && createdAt < TimeUtils.eightHoursAgo()) {
+            StatusTag.STATUS.ENDED
+        } else if (eventStatus == StatusTag.STATUS.PLANNED) {
+            val starts = starts()
+            val ends = ends()
+            if (starts != null && starts < TimeUtils.oneHourAgo()) {
+                StatusTag.STATUS.ENDED
+            } else if (ends != null && ends < TimeUtils.oneHourAgo()) {
+                StatusTag.STATUS.ENDED
+            } else {
+                eventStatus
+            }
+        } else {
+            eventStatus
+        }
+
+    fun participantsIntersect(keySet: Set<String>): Boolean = keySet.contains(pubKey) || tags.any(ParticipantTag::isIn, keySet)
+
+    companion object {
+        const val KIND = 30313
+        const val ALT = "Meeting room event"
+
+        suspend fun create(
+            signer: NostrSigner,
+            createdAt: Long = TimeUtils.now(),
+        ): MeetingRoomEvent {
+            val tags = arrayOf(AltTag.assemble(ALT))
+            return signer.sign(createdAt, KIND, tags, "")
+        }
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/MeetingSpaceEvent.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/MeetingSpaceEvent.kt
@@ -0,0 +1,97 @@
+/**
+ * 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.nip53LiveActivities.meetingSpaces
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.any
+import com.vitorpamplona.quartz.nip01Core.hints.PubKeyHintProvider
+import com.vitorpamplona.quartz.nip01Core.signers.NostrSigner
+import com.vitorpamplona.quartz.nip23LongContent.tags.ImageTag
+import com.vitorpamplona.quartz.nip23LongContent.tags.SummaryTag
+import com.vitorpamplona.quartz.nip31Alts.AltTag
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.EndpointUrlTag
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.RelayListTag
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.RoomNameTag
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.ServiceUrlTag
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.StatusTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ParticipantTag
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class MeetingSpaceEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig),
+    PubKeyHintProvider {
+    override fun pubKeyHints() = tags.mapNotNull(ParticipantTag::parseAsHint)
+
+    override fun linkedPubKeys() = tags.mapNotNull(ParticipantTag::parseKey)
+
+    fun room() = tags.firstNotNullOfOrNull(RoomNameTag::parse)
+
+    fun summary() = tags.firstNotNullOfOrNull(SummaryTag::parse)
+
+    fun image() = tags.firstNotNullOfOrNull(ImageTag::parse)
+
+    fun status() = checkStatus(tags.firstNotNullOfOrNull(StatusTag::parseEnum))
+
+    fun isLive() = status() != StatusTag.STATUS.CLOSED
+
+    fun service() = tags.firstNotNullOfOrNull(ServiceUrlTag::parse)
+
+    fun endpoint() = tags.firstNotNullOfOrNull(EndpointUrlTag::parse)
+
+    fun relays() = tags.mapNotNull(RelayListTag::parse).flatten()
+
+    fun allRelayUrls() = tags.mapNotNull(RelayListTag::parse).flatten()
+
+    fun participantKeys(): List<HexKey> = tags.mapNotNull(ParticipantTag::parseKey)
+
+    fun participants() = tags.mapNotNull(ParticipantTag::parse)
+
+    fun checkStatus(eventStatus: StatusTag.STATUS?): StatusTag.STATUS? =
+        if (eventStatus != StatusTag.STATUS.CLOSED && createdAt < TimeUtils.eightHoursAgo()) {
+            StatusTag.STATUS.CLOSED
+        } else {
+            eventStatus
+        }
+
+    fun participantsIntersect(keySet: Set<String>): Boolean = keySet.contains(pubKey) || tags.any(ParticipantTag::isIn, keySet)
+
+    companion object Companion {
+        const val KIND = 30312
+        const val ALT = "Interactive room event"
+
+        suspend fun create(
+            signer: NostrSigner,
+            createdAt: Long = TimeUtils.now(),
+        ): MeetingSpaceEvent {
+            val tags = arrayOf(AltTag.assemble(ALT))
+            return signer.sign(createdAt, KIND, tags, "")
+        }
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/EndpointUrlTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/EndpointUrlTag.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.nip53LiveActivities.meetingSpaces.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class EndpointUrlTag {
+    companion object Companion {
+        const val TAG_NAME = "endpoint"
+
+        @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(url: String) = arrayOf(TAG_NAME, url)
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/MeetingSpaceTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/MeetingSpaceTag.kt
@@ -0,0 +1,150 @@
+/**
+ * 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.nip53LiveActivities.meetingSpaces.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip01Core.hints.types.AddressHint
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
+import com.vitorpamplona.quartz.nip01Core.tags.addressables.Address
+import com.vitorpamplona.quartz.utils.arrayOfNotNull
+import com.vitorpamplona.quartz.utils.bytesUsedInMemory
+import com.vitorpamplona.quartz.utils.ensure
+import com.vitorpamplona.quartz.utils.pointerSizeInBytes
+
+class MeetingSpaceTag(
+    val address: Address,
+    val relayHint: NormalizedRelayUrl? = null,
+) {
+    fun countMemory(): Long = 2 * pointerSizeInBytes + address.countMemory() + (relayHint?.url?.bytesUsedInMemory() ?: 0)
+
+    fun toTag() = Address.assemble(address.kind, address.pubKeyHex, address.dTag)
+
+    fun toTagArray() = assemble(address, relayHint)
+
+    fun toTagIdOnly() = assemble(address, null)
+
+    companion object Companion {
+        const val TAG_NAME = "a"
+
+        @JvmStatic
+        fun isTagged(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        @JvmStatic
+        fun isTagged(
+            tag: Array<String>,
+            addressId: String,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] == addressId
+
+        @JvmStatic
+        fun isTagged(
+            tag: Array<String>,
+            address: MeetingSpaceTag,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] == address.toTag()
+
+        @JvmStatic
+        fun isIn(
+            tag: Array<String>,
+            addressIds: Set<String>,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] in addressIds
+
+        @JvmStatic
+        fun isTaggedWithKind(
+            tag: Array<String>,
+            kind: String,
+        ) = tag.has(1) && tag[0] == TAG_NAME && Address.isOfKind(tag[1], kind)
+
+        @JvmStatic
+        fun parse(
+            aTagId: String,
+            relay: String?,
+        ) = Address.parse(aTagId)?.let {
+            MeetingSpaceTag(it, relay?.let { RelayUrlNormalizer.normalizeOrNull(it) })
+        }
+
+        @JvmStatic
+        fun parse(tag: Array<String>): MeetingSpaceTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return parse(tag[1], tag.getOrNull(2))
+        }
+
+        @JvmStatic
+        fun parseValidAddress(tag: Array<String>): String? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return Address.parse(tag[1])?.toValue()
+        }
+
+        @JvmStatic
+        fun parseAddress(tag: Array<String>): Address? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return Address.parse(tag[1])
+        }
+
+        @JvmStatic
+        fun parseAddressId(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 parseAsHint(tag: Array<String>): AddressHint? {
+            ensure(tag.has(2)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            ensure(tag[1].contains(':')) { return null }
+            ensure(tag[2].isNotEmpty()) { return null }
+
+            val relayHint = RelayUrlNormalizer.normalizeOrNull(tag[2])
+            ensure(relayHint != null) { return null }
+
+            return AddressHint(tag[1], relayHint)
+        }
+
+        @JvmStatic
+        fun assemble(
+            aTagId: HexKey,
+            relay: NormalizedRelayUrl?,
+        ) = arrayOfNotNull(TAG_NAME, aTagId, relay?.url)
+
+        @JvmStatic
+        fun assemble(
+            address: Address,
+            relay: NormalizedRelayUrl?,
+        ) = arrayOfNotNull(TAG_NAME, address.toValue(), relay?.url)
+
+        @JvmStatic
+        fun assemble(
+            kind: Int,
+            pubKey: String,
+            dTag: String,
+            relay: NormalizedRelayUrl?,
+        ) = assemble(Address.assemble(kind, pubKey, dTag), relay)
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/RecordingTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/RecordingTag.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.nip53LiveActivities.meetingSpaces.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class RecordingTag {
+    companion object {
+        const val TAG_NAME = "recording"
+
+        @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(url: String) = arrayOf(TAG_NAME, url)
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/RelayListTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/RelayListTag.kt
@@ -0,0 +1,50 @@
+/**
+ * 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.nip53LiveActivities.meetingSpaces.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
+import com.vitorpamplona.quartz.utils.ensure
+
+class RelayListTag {
+    companion object {
+        const val TAG_NAME = "relays"
+
+        @JvmStatic
+        fun parse(tag: Array<String>): List<NormalizedRelayUrl>? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            val relays =
+                tag.mapIndexedNotNull { index, s ->
+                    if (index == 0) null else RelayUrlNormalizer.normalizeOrNull(s)
+                }
+
+            if (relays.isEmpty()) return null
+
+            return relays
+        }
+
+        @JvmStatic
+        fun assemble(urls: List<NormalizedRelayUrl>) = arrayOf(TAG_NAME) + urls.map { it.url }.toTypedArray()
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/RoomNameTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/RoomNameTag.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.nip53LiveActivities.meetingSpaces.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class RoomNameTag {
+    companion object Companion {
+        const val TAG_NAME = "room"
+
+        @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(title: String) = arrayOf(TAG_NAME, title)
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/ServiceUrlTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/ServiceUrlTag.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.nip53LiveActivities.meetingSpaces.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class ServiceUrlTag {
+    companion object Companion {
+        const val TAG_NAME = "service"
+
+        @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(url: String) = arrayOf(TAG_NAME, url)
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/StatusTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/meetingSpaces/tags/StatusTag.kt
@@ -0,0 +1,70 @@
+/**
+ * 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.nip53LiveActivities.meetingSpaces.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class StatusTag {
+    enum class STATUS(
+        val code: String,
+    ) {
+        OPEN("open"),
+        PRIVATE("private"),
+        CLOSED("closed"),
+        ;
+
+        fun toTagArray() = assemble(this)
+
+        companion object {
+            fun parse(code: String): STATUS? =
+                when (code) {
+                    STATUS.OPEN.code -> STATUS.OPEN
+                    STATUS.PRIVATE.code -> STATUS.PRIVATE
+                    STATUS.CLOSED.code -> STATUS.CLOSED
+                    else -> null
+                }
+        }
+    }
+
+    companion object {
+        const val TAG_NAME = "status"
+
+        @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 parseEnum(tag: Array<String>): STATUS? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return STATUS.parse(tag[1])
+        }
+
+        @JvmStatic
+        fun assemble(status: STATUS) = arrayOf(TAG_NAME, status.code)
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/presence/MeetingRoomPresenceEvent.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/presence/MeetingRoomPresenceEvent.kt
@@ -0,0 +1,91 @@
+/**
+ * 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.nip53LiveActivities.presence
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.hints.AddressHintProvider
+import com.vitorpamplona.quartz.nip01Core.hints.types.AddressHint
+import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip01Core.tags.addressables.ATag
+import com.vitorpamplona.quartz.nip01Core.tags.addressables.Address
+import com.vitorpamplona.quartz.nip31Alts.alt
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingRoomEvent
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.MeetingSpaceTag
+import com.vitorpamplona.quartz.nip53LiveActivities.presence.tags.HandRaisedTag
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class MeetingRoomPresenceEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig),
+    AddressHintProvider {
+    override fun addressHints(): List<AddressHint> = tags.mapNotNull(MeetingSpaceTag::parseAsHint)
+
+    override fun linkedAddressIds(): List<String> = tags.mapNotNull(MeetingSpaceTag::parseAddressId)
+
+    fun interactiveRoom() = tags.firstNotNullOfOrNull(MeetingSpaceTag::parse)
+
+    fun handRaised() = tags.firstNotNullOfOrNull(HandRaisedTag::parse)
+
+    companion object Companion {
+        const val KIND = 10312
+        const val ALT = "Room Presence tag"
+
+        fun createAddress(
+            pubKey: HexKey,
+            dtag: String,
+        ): Address = Address(KIND, pubKey, dtag)
+
+        fun createAddressATag(
+            pubKey: HexKey,
+            dtag: String,
+        ): ATag = ATag(KIND, pubKey, dtag, null)
+
+        fun createAddressTag(
+            pubKey: HexKey,
+            dtag: String,
+        ): String = Address.assemble(KIND, pubKey, dtag)
+
+        fun build(
+            root: MeetingRoomEvent,
+            handRaised: Boolean?,
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<MeetingRoomPresenceEvent>.() -> Unit = {},
+        ) = eventTemplate(KIND, "", createdAt) {
+            alt(root.title() ?: ALT)
+
+            roomMeeting(MeetingSpaceTag(root.address(), root.relays().firstOrNull()))
+
+            handRaised?.let {
+                handRaised(it)
+            }
+            initializer()
+        }
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/presence/TagArrayBuilderExt.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/presence/TagArrayBuilderExt.kt
@@ -0,0 +1,33 @@
+/**
+ * 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.nip53LiveActivities.presence
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.MeetingRoomEvent
+import com.vitorpamplona.quartz.nip53LiveActivities.meetingSpaces.tags.MeetingSpaceTag
+import com.vitorpamplona.quartz.nip53LiveActivities.presence.tags.HandRaisedTag
+
+fun TagArrayBuilder<MeetingRoomPresenceEvent>.roomMeeting(rep: MeetingSpaceTag) = addUnique(rep.toTagArray())
+
+fun TagArrayBuilder<MeetingRoomPresenceEvent>.roomMeeting(rep: EventHintBundle<MeetingRoomEvent>) = addUnique(rep.toATag().toATagArray())
+
+fun TagArrayBuilder<MeetingRoomPresenceEvent>.handRaised(raised: Boolean) = addUnique(HandRaisedTag.assemble(raised))
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/presence/tags/HandRaisedTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/presence/tags/HandRaisedTag.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.nip53LiveActivities.presence.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class HandRaisedTag {
+    companion object Companion {
+        const val TAG_NAME = "hand"
+
+        @JvmStatic
+        fun parse(tag: Array<String>): Boolean? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1] == "1"
+        }
+
+        @JvmStatic
+        fun assemble(handRaised: Boolean) = arrayOf(TAG_NAME, if (handRaised) "1" else "0")
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/presence/tags/MeetingRoomTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/presence/tags/MeetingRoomTag.kt
@@ -0,0 +1,150 @@
+/**
+ * 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.nip53LiveActivities.presence.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip01Core.hints.types.AddressHint
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
+import com.vitorpamplona.quartz.nip01Core.tags.addressables.Address
+import com.vitorpamplona.quartz.utils.arrayOfNotNull
+import com.vitorpamplona.quartz.utils.bytesUsedInMemory
+import com.vitorpamplona.quartz.utils.ensure
+import com.vitorpamplona.quartz.utils.pointerSizeInBytes
+
+class MeetingRoomTag(
+    val address: Address,
+    val relayHint: NormalizedRelayUrl? = null,
+) {
+    fun countMemory(): Long = 2 * pointerSizeInBytes + address.countMemory() + (relayHint?.url?.bytesUsedInMemory() ?: 0)
+
+    fun toTag() = Address.assemble(address.kind, address.pubKeyHex, address.dTag)
+
+    fun toTagArray() = assemble(address, relayHint)
+
+    fun toTagIdOnly() = assemble(address, null)
+
+    companion object Companion {
+        const val TAG_NAME = "a"
+
+        @JvmStatic
+        fun isTagged(tag: Array<String>) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        @JvmStatic
+        fun isTagged(
+            tag: Array<String>,
+            addressId: String,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] == addressId
+
+        @JvmStatic
+        fun isTagged(
+            tag: Array<String>,
+            address: MeetingRoomTag,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] == address.toTag()
+
+        @JvmStatic
+        fun isIn(
+            tag: Array<String>,
+            addressIds: Set<String>,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] in addressIds
+
+        @JvmStatic
+        fun isTaggedWithKind(
+            tag: Array<String>,
+            kind: String,
+        ) = tag.has(1) && tag[0] == TAG_NAME && Address.isOfKind(tag[1], kind)
+
+        @JvmStatic
+        fun parse(
+            aTagId: String,
+            relay: String?,
+        ) = Address.parse(aTagId)?.let {
+            MeetingRoomTag(it, relay?.let { RelayUrlNormalizer.normalizeOrNull(it) })
+        }
+
+        @JvmStatic
+        fun parse(tag: Array<String>): MeetingRoomTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return parse(tag[1], tag.getOrNull(2))
+        }
+
+        @JvmStatic
+        fun parseValidAddress(tag: Array<String>): String? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return Address.parse(tag[1])?.toValue()
+        }
+
+        @JvmStatic
+        fun parseAddress(tag: Array<String>): Address? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return Address.parse(tag[1])
+        }
+
+        @JvmStatic
+        fun parseAddressId(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 parseAsHint(tag: Array<String>): AddressHint? {
+            ensure(tag.has(2)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            ensure(tag[1].contains(':')) { return null }
+            ensure(tag[2].isNotEmpty()) { return null }
+
+            val relayHint = RelayUrlNormalizer.normalizeOrNull(tag[2])
+            ensure(relayHint != null) { return null }
+
+            return AddressHint(tag[1], relayHint)
+        }
+
+        @JvmStatic
+        fun assemble(
+            aTagId: HexKey,
+            relay: NormalizedRelayUrl?,
+        ) = arrayOfNotNull(TAG_NAME, aTagId, relay?.url)
+
+        @JvmStatic
+        fun assemble(
+            address: Address,
+            relay: NormalizedRelayUrl?,
+        ) = arrayOfNotNull(TAG_NAME, address.toValue(), relay?.url)
+
+        @JvmStatic
+        fun assemble(
+            kind: Int,
+            pubKey: String,
+            dTag: String,
+            relay: NormalizedRelayUrl?,
+        ) = assemble(Address.assemble(kind, pubKey, dTag), relay)
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/LiveActivitiesEvent.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/LiveActivitiesEvent.kt
@@ -24,13 +24,10 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.quartz.nip01Core.core.BaseAddressableEvent
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.core.any
-import com.vitorpamplona.quartz.nip01Core.hints.AddressHintProvider
 import com.vitorpamplona.quartz.nip01Core.hints.EventHintProvider
 import com.vitorpamplona.quartz.nip01Core.hints.PubKeyHintProvider
+import com.vitorpamplona.quartz.nip01Core.hints.types.EventIdHint
 import com.vitorpamplona.quartz.nip01Core.signers.NostrSigner
-import com.vitorpamplona.quartz.nip01Core.tags.addressables.ATag
-import com.vitorpamplona.quartz.nip01Core.tags.events.ETag
-import com.vitorpamplona.quartz.nip18Reposts.quotes.QTag
 import com.vitorpamplona.quartz.nip23LongContent.tags.ImageTag
 import com.vitorpamplona.quartz.nip23LongContent.tags.SummaryTag
 import com.vitorpamplona.quartz.nip23LongContent.tags.TitleTag
@@ -38,6 +35,8 @@ import com.vitorpamplona.quartz.nip31Alts.AltTag
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.CurrentParticipantsTag
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.EndsTag
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.ParticipantTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.PinnedEventTag
+import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.RecordingTag
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.RelayListTag
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.StartsTag
 import com.vitorpamplona.quartz.nip53LiveActivities.streaming.tags.StatusTag
@@ -55,15 +54,26 @@ class LiveActivitiesEvent(
    sig: HexKey,
 ) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig),
    EventHintProvider,
-    AddressHintProvider,
    PubKeyHintProvider {
-    override fun eventHints() = tags.mapNotNull(ETag::parseAsHint) + tags.mapNotNull(QTag::parseEventAsHint)
+    override fun eventHints(): List<EventIdHint> {
+        val pinnedEvents = pinned()
+        if (pinnedEvents.isEmpty()) return emptyList()

-    override fun linkedEventIds() = tags.mapNotNull(ETag::parseId) + tags.mapNotNull(QTag::parseEventId)
+        val relays = allRelayUrls()

-    override fun addressHints() = tags.mapNotNull(ATag::parseAsHint) + tags.mapNotNull(QTag::parseAddressAsHint)
+        return if (relays.isNotEmpty()) {
+            pinnedEvents
+                .map { eventId ->
+                    relays.map { relay ->
+                        EventIdHint(eventId, relay)
+                    }
+                }.flatten()
+        } else {
+            emptyList()
+        }
+    }

-    override fun linkedAddressIds() = tags.mapNotNull(ATag::parseAddressId) + tags.mapNotNull(QTag::parseAddressId)
+    override fun linkedEventIds() = tags.mapNotNull(PinnedEventTag::parse)

    override fun pubKeyHints() = tags.mapNotNull(ParticipantTag::parseAsHint)

@@ -77,6 +87,8 @@ class LiveActivitiesEvent(

    fun streaming() = tags.firstNotNullOfOrNull(StreamingTag::parse)

+    fun recording() = tags.firstNotNullOfOrNull(RecordingTag::parse)
+
    fun starts() = tags.firstNotNullOfOrNull(StartsTag::parse)

    fun ends() = tags.firstNotNullOfOrNull(EndsTag::parse)
@@ -93,7 +105,7 @@ class LiveActivitiesEvent(

    fun participants() = tags.mapNotNull(ParticipantTag::parse)

-    fun relays() = tags.mapNotNull(RelayListTag::parse)
+    fun relays() = tags.mapNotNull(RelayListTag::parse).flatten()

    fun allRelayUrls() = tags.mapNotNull(RelayListTag::parse).flatten()

@@ -103,6 +115,8 @@ class LiveActivitiesEvent(

    fun hosts() = tags.mapNotNull(ParticipantTag::parseHost)

+    fun pinned() = tags.mapNotNull(PinnedEventTag::parse)
+
    fun checkStatus(eventStatus: StatusTag.STATUS?): StatusTag.STATUS? =
        if (eventStatus == StatusTag.STATUS.LIVE && createdAt < TimeUtils.eightHoursAgo()) {
            StatusTag.STATUS.ENDED
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/tags/ParticipantTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/tags/ParticipantTag.kt
@@ -35,6 +35,7 @@ enum class ROLE(
    val code: String,
 ) {
    HOST("host"),
+    MODERATOR("moderator"),
    SPEAKER("speaker"),
 }

--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/tags/PinnedEventTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/tags/PinnedEventTag.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.nip53LiveActivities.streaming.tags
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.Tag
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.arrayOfNotNull
+import com.vitorpamplona.quartz.utils.ensure
+
+@Immutable
+class PinnedEventTag {
+    companion object {
+        const val TAG_NAME = "pinned"
+
+        fun isIn(
+            tag: Array<String>,
+            eventIds: Set<HexKey>,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] in eventIds
+
+        @JvmStatic
+        fun parse(tag: Tag): String? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+            return tag[1]
+        }
+
+        @JvmStatic
+        fun assemble(eventId: HexKey) = arrayOfNotNull(TAG_NAME, eventId)
+    }
+}
--- a/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/tags/RecordingTag.kt
+++ b/quartz/src/androidMain/kotlin/com/vitorpamplona/quartz/nip53LiveActivities/streaming/tags/RecordingTag.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.nip53LiveActivities.streaming.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class RecordingTag {
+    companion object {
+        const val TAG_NAME = "recording"
+
+        @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(url: String) = arrayOf(TAG_NAME, url)
+    }
+}