Reduces the amount of wasted memory by using Array<Array<List>> as opposed to List<List<String>> for tags.

app/src/main/java/com/vitorpamplona/amethyst/model/Note.kt

@@ -284,7 +284,7 @@ open class Note(val idHex: String) {
     }
 
     fun removeReaction(note: Note) {
-        val tags = note.event?.tags() ?: emptyList()
+        val tags = note.event?.tags() ?: emptyArray()
         val reaction = note.event?.content()?.firstFullCharOrEmoji(ImmutableListOfLists(tags)) ?: "+"
 
         if (reaction in reactions.keys && reactions[reaction]?.contains(note) == true) {
@@ -403,7 +403,7 @@ open class Note(val idHex: String) {
     }
 
     fun addReaction(note: Note) {
-        val tags = note.event?.tags() ?: emptyList()
+        val tags = note.event?.tags() ?: emptyArray()
         val reaction = note.event?.content()?.firstFullCharOrEmoji(ImmutableListOfLists(tags)) ?: "+"
 
         if (reaction !in reactions.keys) {

app/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -1586,7 +1586,7 @@ fun RenderAppDefinition(
                     Row(verticalAlignment = Alignment.Bottom, modifier = Modifier.padding(top = 7.dp)) {
                         CreateTextWithEmoji(
                             text = it,
-                            tags = remember { (note.event?.tags() ?: emptyList()).toImmutableListOfLists() },
+                            tags = remember { (note.event?.tags() ?: emptyArray()).toImmutableListOfLists() },
                             fontWeight = FontWeight.Bold,
                             fontSize = 25.sp
                         )

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/CardFeedState.kt

@@ -64,7 +64,7 @@ class MultiSetCard(
     )
 
     val likeEventsByType = likeEvents.groupBy {
-        it.event?.content()?.firstFullCharOrEmoji(ImmutableListOfLists(it.event?.tags() ?: emptyList())) ?: "+"
+        it.event?.content()?.firstFullCharOrEmoji(ImmutableListOfLists(it.event?.tags() ?: emptyArray())) ?: "+"
     }.mapValues {
         it.value.toImmutableList()
     }.toImmutableMap()

quartz/src/main/java/com/vitorpamplona/quartz/events/AdvertisedRelayListEvent.kt

@@ -13,7 +13,7 @@ class AdvertisedRelayListEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -47,11 +47,11 @@ class AdvertisedRelayListEvent(
         ) {
             val tags = list.map {
                 if (it.type == AdvertisedRelayType.BOTH) {
-                    listOf(it.relayUrl)
+                    arrayOf(it.relayUrl)
                 } else {
-                    listOf(it.relayUrl, it.type.code)
+                    arrayOf(it.relayUrl, it.type.code)
                 }
-            }
+            }.toTypedArray()
             val msg = ""
 
             signer.sign(createdAt, kind, tags, msg, onReady)

quartz/src/main/java/com/vitorpamplona/quartz/events/AppDefinitionEvent.kt

@@ -13,7 +13,7 @@ class AppDefinitionEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -54,7 +54,7 @@ class AppDefinitionEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (AppDefinitionEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/AppRecommendationEvent.kt

@@ -11,7 +11,7 @@ class AppRecommendationEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -27,7 +27,7 @@ class AppRecommendationEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (AppRecommendationEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/AudioHeaderEvent.kt

@@ -11,7 +11,7 @@ class AudioHeaderEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -29,7 +29,7 @@ class AudioHeaderEvent(
         private const val STREAM_URL = "stream_url"
         private const val WAVEFORM = "waveform"
 
-        suspend fun create(
+        fun create(
             description: String,
             downloadUrl: String,
             streamUrl: String? = null,
@@ -40,17 +40,17 @@ class AudioHeaderEvent(
             onReady: (AudioHeaderEvent) -> Unit
         ) {
             val tags = listOfNotNull(
-                downloadUrl.let { listOf(DOWNLOAD_URL, it) },
+                downloadUrl.let { arrayOf(DOWNLOAD_URL, it) },
-                streamUrl?.let { listOf(STREAM_URL, it) },
+                streamUrl?.let { arrayOf(STREAM_URL, it) },
-                wavefront?.let { listOf(WAVEFORM, it) },
+                wavefront?.let { arrayOf(WAVEFORM, it) },
                 sensitiveContent?.let {
                     if (it) {
-                        listOf("content-warning", "")
+                        arrayOf("content-warning", "")
                     } else {
                         null
                     }
                 }
-            )
+            ).toTypedArray()
 
             signer.sign(createdAt, kind, tags, description, onReady)
         }

quartz/src/main/java/com/vitorpamplona/quartz/events/AudioTrackEvent.kt

@@ -13,7 +13,7 @@ class AudioTrackEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -46,12 +46,12 @@ class AudioTrackEvent(
             onReady: (AudioTrackEvent) -> Unit
         ) {
             val tags = listOfNotNull(
-                listOf(MEDIA, media),
+                arrayOf(MEDIA, media),
-                listOf(TYPE, type),
+                arrayOf(TYPE, type),
-                price?.let { listOf(PRICE, it) },
+                price?.let { arrayOf(PRICE, it) },
-                cover?.let { listOf(COVER, it) },
+                cover?.let { arrayOf(COVER, it) },
-                subject?.let { listOf(SUBJECT, it) }
+                subject?.let { arrayOf(SUBJECT, it) }
-            )
+            ).toTypedArray()
 
             signer.sign(createdAt, kind, tags, "", onReady)
         }

quartz/src/main/java/com/vitorpamplona/quartz/events/BadgeAwardEvent.kt

@@ -8,7 +8,7 @@ class BadgeAwardEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {

quartz/src/main/java/com/vitorpamplona/quartz/events/BadgeDefinitionEvent.kt

@@ -9,7 +9,7 @@ class BadgeDefinitionEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {

quartz/src/main/java/com/vitorpamplona/quartz/events/BadgeProfilesEvent.kt

@@ -9,7 +9,7 @@ class BadgeProfilesEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {

quartz/src/main/java/com/vitorpamplona/quartz/events/BaseTextNoteEvent.kt

@@ -16,7 +16,7 @@ open class BaseTextNoteEvent(
     pubKey: HexKey,
     createdAt: Long,
     kind: Int,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {

quartz/src/main/java/com/vitorpamplona/quartz/events/BookmarkListEvent.kt

@@ -13,7 +13,7 @@ class BookmarkListEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : GeneralListEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -49,7 +49,7 @@ class BookmarkListEvent(
         ) {
             add(
                 earlierVersion,
-                listOf(listOf(tagName, tagValue)),
+                arrayOf(arrayOf(tagName, tagValue)),
                 isPrivate,
                 signer,
                 createdAt,
@@ -59,7 +59,7 @@ class BookmarkListEvent(
 
         fun add(
             earlierVersion: BookmarkListEvent?,
-            listNewTags: List<List<String>>,
+            listNewTags: Array<Array<String>>,
             isPrivate: Boolean,
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
@@ -88,7 +88,7 @@ class BookmarkListEvent(
                     ) { encryptedTags ->
                         create(
                             content = encryptedTags,
-                            tags = emptyList(),
+                            tags = emptyArray(),
                             signer = signer,
                             createdAt = createdAt,
                             onReady = onReady
@@ -98,7 +98,7 @@ class BookmarkListEvent(
             } else {
                 create(
                     content = earlierVersion?.content ?: "",
-                    tags = (earlierVersion?.tags ?: emptyList()).plus(listNewTags),
+                    tags = (earlierVersion?.tags ?: emptyArray()).plus(listNewTags),
                     signer = signer,
                     createdAt = createdAt,
                     onReady = onReady
@@ -136,12 +136,12 @@ class BookmarkListEvent(
             if (isPrivate) {
                 earlierVersion.privateTagsOrEmpty(signer) { privateTags ->
                     encryptTags(
-                        privateTags = privateTags.filter { it.size <= 1 || !(it[0] == tagName && it[1] == tagValue) },
+                        privateTags = privateTags.filter { it.size <= 1 || !(it[0] == tagName && it[1] == tagValue) }.toTypedArray(),
                         signer = signer
                     ) { encryptedTags ->
                         create(
                             content = encryptedTags,
-                            tags = earlierVersion.tags.filter { it.size <= 1 || !(it[0] == tagName && it[1] == tagValue) },
+                            tags = earlierVersion.tags.filter { it.size <= 1 || !(it[0] == tagName && it[1] == tagValue) }.toTypedArray(),
                             signer = signer,
                             createdAt = createdAt,
                             onReady = onReady
@@ -151,7 +151,7 @@ class BookmarkListEvent(
             } else {
                 create(
                     content = earlierVersion.content,
-                    tags = earlierVersion.tags.filter { it.size <= 1 || !(it[0] == tagName && it[1] == tagValue) },
+                    tags = earlierVersion.tags.filter { it.size <= 1 || !(it[0] == tagName && it[1] == tagValue) }.toTypedArray(),
                     signer = signer,
                     createdAt = createdAt,
                     onReady = onReady
@@ -161,7 +161,7 @@ class BookmarkListEvent(
 
         fun create(
             content: String,
-            tags: List<List<String>>,
+            tags: Array<Array<String>>,
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
             onReady: (BookmarkListEvent) -> Unit
@@ -184,21 +184,21 @@ class BookmarkListEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (BookmarkListEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
-            tags.add(listOf("d", name))
+            tags.add(arrayOf("d", name))
 
             events?.forEach {
-                tags.add(listOf("e", it))
+                tags.add(arrayOf("e", it))
             }
             users?.forEach {
-                tags.add(listOf("p", it))
+                tags.add(arrayOf("p", it))
             }
             addresses?.forEach {
-                tags.add(listOf("a", it.toTag()))
+                tags.add(arrayOf("a", it.toTag()))
             }
 
             createPrivateTags(privEvents, privUsers, privAddresses, signer) { content ->
-                signer.sign(createdAt, kind, tags, content, onReady)
+                signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
             }
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/CalendarDateSlotEvent.kt

@@ -13,7 +13,7 @@ class CalendarDateSlotEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -33,7 +33,7 @@ class CalendarDateSlotEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (CalendarDateSlotEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/CalendarEvent.kt

@@ -13,7 +13,7 @@ class CalendarEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -25,7 +25,7 @@ class CalendarEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (CalendarEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/CalendarRSVPEvent.kt

@@ -13,7 +13,7 @@ class CalendarRSVPEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -35,7 +35,7 @@ class CalendarRSVPEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (CalendarRSVPEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/CalendarTimeSlotEvent.kt

@@ -13,7 +13,7 @@ class CalendarTimeSlotEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -37,7 +37,7 @@ class CalendarTimeSlotEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (CalendarTimeSlotEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/ChannelCreateEvent.kt

@@ -16,7 +16,7 @@ class ChannelCreateEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -65,7 +65,7 @@ class ChannelCreateEvent(
                 ""
             }
 
-            signer.sign(createdAt, kind, emptyList(), content, onReady)
+            signer.sign(createdAt, kind, emptyArray(), content, onReady)
         }
     }
 

quartz/src/main/java/com/vitorpamplona/quartz/events/ChannelHideMessageEvent.kt

@@ -12,7 +12,7 @@ class ChannelHideMessageEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig), IsInPublicChatChannel {
@@ -36,8 +36,8 @@ class ChannelHideMessageEvent(
         ) {
             val tags =
                 messagesToHide?.map {
-                    listOf("e", it)
+                    arrayOf("e", it)
-                } ?: emptyList()
+                }?.toTypedArray() ?: emptyArray()
 
             signer.sign(createdAt, kind, tags, reason, onReady)
         }

quartz/src/main/java/com/vitorpamplona/quartz/events/ChannelMessageEvent.kt

@@ -2,9 +2,6 @@ package com.vitorpamplona.quartz.events
 
 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.quartz.utils.TimeUtils
-import com.vitorpamplona.quartz.encoders.toHexKey
-import com.vitorpamplona.quartz.crypto.CryptoUtils
-import com.vitorpamplona.quartz.crypto.KeyPair
 import com.vitorpamplona.quartz.encoders.HexKey
 import com.vitorpamplona.quartz.signers.NostrSigner
 
@@ -13,7 +10,7 @@ class ChannelMessageEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseTextNoteEvent(id, pubKey, createdAt, kind, tags, content, sig), IsInPublicChatChannel {
@@ -42,30 +39,29 @@ class ChannelMessageEvent(
             geohash: String? = null,
             onReady: (ChannelMessageEvent) -> Unit
         ) {
-            val content = message
             val tags = mutableListOf(
-                listOf("e", channel, "", "root")
+                arrayOf("e", channel, "", "root")
             )
             replyTos?.forEach {
-                tags.add(listOf("e", it))
+                tags.add(arrayOf("e", it))
             }
             mentions?.forEach {
-                tags.add(listOf("p", it))
+                tags.add(arrayOf("p", it))
             }
             zapReceiver?.forEach {
-                tags.add(listOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
+                tags.add(arrayOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
             }
             if (markAsSensitive) {
-                tags.add(listOf("content-warning", ""))
+                tags.add(arrayOf("content-warning", ""))
             }
             zapRaiserAmount?.let {
-                tags.add(listOf("zapraiser", "$it"))
+                tags.add(arrayOf("zapraiser", "$it"))
             }
             geohash?.let {
                 tags.addAll(geohashMipMap(it))
             }
 
-            signer.sign(createdAt, kind, tags, content, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), message, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/ChannelMetadataEvent.kt

@@ -14,7 +14,7 @@ class ChannelMetadataEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig), IsInPublicChatChannel {
@@ -65,8 +65,8 @@ class ChannelMetadataEvent(
                     ""
                 }
 
-            val tags = listOf(listOf("e", originalChannelIdHex, "", "root"))
+            val tags = listOf(arrayOf("e", originalChannelIdHex, "", "root"))
-            signer.sign(createdAt, kind, tags, content, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/ChannelMuteUserEvent.kt

@@ -12,7 +12,7 @@ class ChannelMuteUserEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig), IsInPublicChatChannel {
@@ -36,8 +36,8 @@ class ChannelMuteUserEvent(
         ) {
             val content = reason
             val tags = usersToMute?.map {
-                listOf("p", it)
+                arrayOf("p", it)
-            } ?: emptyList()
+            }?.toTypedArray() ?: emptyArray()
 
             signer.sign(createdAt, kind, tags, content, onReady)
         }

quartz/src/main/java/com/vitorpamplona/quartz/events/ChatMessageEvent.kt

@@ -13,7 +13,7 @@ class ChatMessageEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : WrappedEvent(id, pubKey, createdAt, kind, tags, content, sig), ChatroomKeyable {
@@ -64,33 +64,33 @@ class ChatMessageEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (ChatMessageEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
             to?.forEach {
-                tags.add(listOf("p", it))
+                tags.add(arrayOf("p", it))
             }
             replyTos?.forEach {
-                tags.add(listOf("e", it))
+                tags.add(arrayOf("e", it))
             }
             mentions?.forEach {
-                tags.add(listOf("p", it, "", "mention"))
+                tags.add(arrayOf("p", it, "", "mention"))
             }
             zapReceiver?.forEach {
-                tags.add(listOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
+                tags.add(arrayOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
             }
             if (markAsSensitive) {
-                tags.add(listOf("content-warning", ""))
+                tags.add(arrayOf("content-warning", ""))
             }
             zapRaiserAmount?.let {
-                tags.add(listOf("zapraiser", "$it"))
+                tags.add(arrayOf("zapraiser", "$it"))
             }
             geohash?.let {
                 tags.addAll(geohashMipMap(it))
             }
             subject?.let {
-                tags.add(listOf("subject", it))
+                tags.add(arrayOf("subject", it))
             }
 
-            signer.sign(createdAt, kind, tags, msg, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), msg, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/ClassifiedsEvent.kt

@@ -13,7 +13,7 @@ class ClassifiedsEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -46,26 +46,26 @@ class ClassifiedsEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (ClassifiedsEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
 
-            tags.add(listOf("d", dTag))
+            tags.add(arrayOf("d", dTag))
-            title?.let { tags.add(listOf("title", it)) }
+            title?.let { tags.add(arrayOf("title", it)) }
-            image?.let { tags.add(listOf("image", it)) }
+            image?.let { tags.add(arrayOf("image", it)) }
-            summary?.let { tags.add(listOf("summary", it)) }
+            summary?.let { tags.add(arrayOf("summary", it)) }
             price?.let {
                 if (it.frequency != null && it.currency != null) {
-                    tags.add(listOf("price", it.amount, it.currency, it.frequency))
+                    tags.add(arrayOf("price", it.amount, it.currency, it.frequency))
                 } else if (it.currency != null) {
-                    tags.add(listOf("price", it.amount, it.currency))
+                    tags.add(arrayOf("price", it.amount, it.currency))
                 } else {
-                    tags.add(listOf("price", it.amount))
+                    tags.add(arrayOf("price", it.amount))
                 }
             }
-            location?.let { tags.add(listOf("location", it)) }
+            location?.let { tags.add(arrayOf("location", it)) }
-            publishedAt?.let { tags.add(listOf("publishedAt", it.toString())) }
+            publishedAt?.let { tags.add(arrayOf("publishedAt", it.toString())) }
-            title?.let { tags.add(listOf("title", it)) }
+            title?.let { tags.add(arrayOf("title", it)) }
 
-            signer.sign(createdAt, kind, tags, "", onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), "", onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/CommunityDefinitionEvent.kt

@@ -13,7 +13,7 @@ class CommunityDefinitionEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -31,7 +31,7 @@ class CommunityDefinitionEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (CommunityDefinitionEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/CommunityPostApprovalEvent.kt

@@ -14,7 +14,7 @@ class CommunityPostApprovalEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -55,12 +55,12 @@ class CommunityPostApprovalEvent(
         ) {
             val content = approvedPost.toJson()
 
-            val communities = listOf("a", community.address().toTag())
+            val communities = arrayOf("a", community.address().toTag())
-            val replyToPost = listOf("e", approvedPost.id())
+            val replyToPost = arrayOf("e", approvedPost.id())
-            val replyToAuthor = listOf("p", approvedPost.pubKey())
+            val replyToAuthor = arrayOf("p", approvedPost.pubKey())
-            val innerKind = listOf("k", "${approvedPost.kind()}")
+            val innerKind = arrayOf("k", "${approvedPost.kind()}")
 
-            val tags: List<List<String>> = listOf(communities, replyToPost, replyToAuthor, innerKind)
+            val tags: Array<Array<String>> = arrayOf(communities, replyToPost, replyToAuthor, innerKind)
 
             signer.sign(createdAt, kind, tags, content, onReady)
         }

quartz/src/main/java/com/vitorpamplona/quartz/events/ContactListEvent.kt

@@ -21,7 +21,7 @@ class ContactListEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -112,27 +112,27 @@ class ContactListEvent(
 
             val tags = followUsers.map {
                 if (it.relayUri != null) {
-                    listOf("p", it.pubKeyHex, it.relayUri)
+                    arrayOf("p", it.pubKeyHex, it.relayUri)
                 } else {
-                    listOf("p", it.pubKeyHex)
+                    arrayOf("p", it.pubKeyHex)
                 }
             } + followTags.map {
-                listOf("t", it)
+                arrayOf("t", it)
             } + followEvents.map {
-                listOf("e", it)
+                arrayOf("e", it)
             } + followCommunities.map {
                 if (it.relay != null) {
-                    listOf("a", it.toTag(), it.relay)
+                    arrayOf("a", it.toTag(), it.relay)
                 } else {
-                    listOf("a", it.toTag())
+                    arrayOf("a", it.toTag())
                 }
             } + followGeohashes.map {
-                listOf("g", it)
+                arrayOf("g", it)
             }
 
             return create(
                 content = content,
-                tags = tags,
+                tags = tags.toTypedArray(),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -144,7 +144,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.plus(element = listOf("p", pubKeyHex)),
+                tags = earlierVersion.tags.plus(element = arrayOf("p", pubKeyHex)),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -156,7 +156,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.filter { it.size > 1 && it[1] != pubKeyHex },
+                tags = earlierVersion.tags.filter { it.size > 1 && it[1] != pubKeyHex }.toTypedArray(),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -168,7 +168,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.plus(element = listOf("t", hashtag)),
+                tags = earlierVersion.tags.plus(element = arrayOf("t", hashtag)),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -180,7 +180,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.filter { it.size > 1 && !it[1].equals(hashtag, true) },
+                tags = earlierVersion.tags.filter { it.size > 1 && !it[1].equals(hashtag, true) }.toTypedArray(),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -192,7 +192,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.plus(element = listOf("g", hashtag)),
+                tags = earlierVersion.tags.plus(element = arrayOf("g", hashtag)),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -204,7 +204,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.filter { it.size > 1 && it[1] != hashtag },
+                tags = earlierVersion.tags.filter { it.size > 1 && it[1] != hashtag }.toTypedArray(),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -216,7 +216,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.plus(element = listOf("e", idHex)),
+                tags = earlierVersion.tags.plus(element = arrayOf("e", idHex)),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -228,7 +228,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.filter { it.size > 1 && it[1] != idHex },
+                tags = earlierVersion.tags.filter { it.size > 1 && it[1] != idHex }.toTypedArray(),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -240,7 +240,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.plus(element = listOfNotNull("a", aTag.toTag(), aTag.relay)),
+                tags = earlierVersion.tags.plus(element = listOfNotNull("a", aTag.toTag(), aTag.relay).toTypedArray()),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -252,7 +252,7 @@ class ContactListEvent(
 
             return create(
                 content = earlierVersion.content,
-                tags = earlierVersion.tags.filter { it.size > 1 && it[1] != aTag.toTag() },
+                tags = earlierVersion.tags.filter { it.size > 1 && it[1] != aTag.toTag() }.toTypedArray(),
                 signer = signer,
                 createdAt = createdAt,
                 onReady = onReady
@@ -277,7 +277,7 @@ class ContactListEvent(
 
         fun create(
             content: String,
-            tags: List<List<String>>,
+            tags: Array<Array<String>>,
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
             onReady: (ContactListEvent) -> Unit
@@ -346,10 +346,10 @@ class UserMetadata {
 }
 
 @Stable
-data class ImmutableListOfLists<T>(val lists: List<List<T>> = emptyList())
+data class ImmutableListOfLists<T>(val lists: Array<Array<T>>)
 
-val EmptyTagList = ImmutableListOfLists<String>(emptyList())
+val EmptyTagList = ImmutableListOfLists<String>(emptyArray())
 
-fun List<List<String>>.toImmutableListOfLists(): ImmutableListOfLists<String> {
+fun Array<Array<String>>.toImmutableListOfLists(): ImmutableListOfLists<String> {
     return ImmutableListOfLists(this)
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/DeletionEvent.kt

@@ -13,7 +13,7 @@ class DeletionEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -24,7 +24,7 @@ class DeletionEvent(
 
         fun create(deleteEvents: List<String>, signer: NostrSigner, createdAt: Long = TimeUtils.now(), onReady: (DeletionEvent) -> Unit) {
             val content = ""
-            val tags = deleteEvents.map { listOf("e", it) }
+            val tags = deleteEvents.map { arrayOf("e", it) }.toTypedArray()
             signer.sign(createdAt, kind, tags, content, onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/EmojiPackEvent.kt

@@ -12,7 +12,7 @@ class EmojiPackEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : GeneralListEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -28,10 +28,10 @@ class EmojiPackEvent(
         ) {
             val content = ""
 
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
-            tags.add(listOf("d", name))
+            tags.add(arrayOf("d", name))
 
-            signer.sign(createdAt, kind, tags, content, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/EmojiPackSelectionEvent.kt

@@ -14,7 +14,7 @@ class EmojiPackSelectionEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -31,13 +31,13 @@ class EmojiPackSelectionEvent(
             onReady: (EmojiPackSelectionEvent) -> Unit
         ) {
             val msg = ""
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
 
             listOfEmojiPacks?.forEach {
-                tags.add(listOf("a", it.toTag()))
+                tags.add(arrayOf("a", it.toTag()))
             }
 
-            signer.sign(createdAt, kind, tags, msg, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), msg, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/Event.kt

@@ -11,6 +11,7 @@ import com.fasterxml.jackson.databind.JsonNode
 import com.fasterxml.jackson.databind.SerializerProvider
 import com.fasterxml.jackson.databind.deser.std.StdDeserializer
 import com.fasterxml.jackson.databind.module.SimpleModule
+import com.fasterxml.jackson.databind.node.ArrayNode
 import com.fasterxml.jackson.databind.ser.std.StdSerializer
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import com.vitorpamplona.quartz.crypto.CryptoUtils
@@ -33,7 +34,7 @@ open class Event(
     @JsonProperty("created_at")
     val createdAt: Long,
     val kind: Int,
-    val tags: List<List<String>>,
+    val tags: Array<Array<String>>,
     val content: String,
     val sig: HexKey
 ) : EventInterface {
@@ -55,7 +56,7 @@ open class Event(
 
     override fun kind(): Int = kind
 
-    override fun tags(): List<List<String>> = tags
+    override fun tags(): Array<Array<String>> = tags
 
     override fun content(): String = content
 
@@ -272,14 +273,13 @@ open class Event(
     private class GossipDeserializer : StdDeserializer<Gossip>(Gossip::class.java) {
         override fun deserialize(jp: JsonParser, ctxt: DeserializationContext): Gossip {
             val jsonObject: JsonNode = jp.codec.readTree(jp)
-            val tagList = jsonObject.get("tags")
             return Gossip(
                 id = jsonObject.get("id")?.asText()?.intern(),
                 pubKey = jsonObject.get("pubkey")?.asText()?.intern(),
                 createdAt = jsonObject.get("created_at")?.asLong(),
                 kind = jsonObject.get("kind")?.asInt(),
-                tags = tagList.mapTo(ArrayList<List<String>>(tagList.size())) {
+                tags = jsonObject.get("tags").toTypedArray {
-                    it.mapNotNullTo(ArrayList<String>(it.size())) { s -> if (s.isNull) null else s.asText().intern() }
+                    it.toTypedArray { s -> if (s.isNull) "" else s.asText().intern() }
                 },
                 content = jsonObject.get("content")?.asText()
             )
@@ -295,7 +295,7 @@ open class Event(
             gen.writeNumberField("kind", event.kind)
             gen.writeArrayFieldStart("tags")
             event.tags.forEach { tag ->
-                gen.writeArray(tag.toTypedArray(), 0, tag.size)
+                gen.writeArray(tag, 0, tag.size)
             }
             gen.writeEndArray()
             gen.writeStringField("content", event.content)
@@ -314,7 +314,7 @@ open class Event(
             event.tags?.let {
                 gen.writeArrayFieldStart("tags")
                 event.tags.forEach { tag ->
-                    gen.writeArray(tag.toTypedArray(), 0, tag.size)
+                    gen.writeArray(tag, 0, tag.size)
                 }
                 gen.writeEndArray()
             }
@@ -361,24 +361,29 @@ open class Event(
             )
 
         fun fromJson(jsonObject: JsonNode): Event {
-            val tagList = jsonObject.get("tags")
             return EventFactory.create(
                 id = jsonObject.get("id").asText().intern(),
                 pubKey = jsonObject.get("pubkey").asText().intern(),
                 createdAt = jsonObject.get("created_at").asLong(),
                 kind = jsonObject.get("kind").asInt(),
-                tags = tagList.mapTo(ArrayList<List<String>>(tagList.size())) {
+                tags = jsonObject.get("tags").toTypedArray {
-                    it.mapNotNullTo(ArrayList<String>(it.size())) { s -> if (s.isNull) null else s.asText().intern() }
+                    it.toTypedArray { s -> if (s.isNull) "" else s.asText().intern() }
                 },
                 content = jsonObject.get("content").asText(),
                 sig = jsonObject.get("sig").asText()
             )
         }
 
+        private inline fun <reified R> JsonNode.toTypedArray(transform: (JsonNode) -> R): Array<R> {
+            return Array(size()) {
+                transform(get(it))
+            }
+        }
+
         fun fromJson(json: String): Event = mapper.readValue(json, Event::class.java)
         fun toJson(event: Event): String = mapper.writeValueAsString(event)
 
-        fun makeJsonForId(pubKey: HexKey, createdAt: Long, kind: Int, tags: List<List<String>>, content: String): String {
+        fun makeJsonForId(pubKey: HexKey, createdAt: Long, kind: Int, tags: Array<Array<String>>, content: String): String {
             val factory = mapper.nodeFactory
             val rawEvent = factory.arrayNode(6).apply {
                 add(0)
@@ -402,11 +407,11 @@ open class Event(
             return mapper.writeValueAsString(rawEvent)
         }
 
-        fun generateId(pubKey: HexKey, createdAt: Long, kind: Int, tags: List<List<String>>, content: String): ByteArray {
+        fun generateId(pubKey: HexKey, createdAt: Long, kind: Int, tags: Array<Array<String>>, content: String): ByteArray {
             return CryptoUtils.sha256(makeJsonForId(pubKey, createdAt, kind, tags, content).toByteArray())
         }
 
-        fun create(signer: NostrSigner, kind: Int, tags: List<List<String>> = emptyList(), content: String = "", createdAt: Long = TimeUtils.now(), onReady: (Event) -> Unit) {
+        fun create(signer: NostrSigner, kind: Int, tags: Array<Array<String>> = emptyArray(), content: String = "", createdAt: Long = TimeUtils.now(), onReady: (Event) -> Unit) {
             return signer.sign(createdAt, kind, tags, content, onReady)
         }
     }
@@ -420,7 +425,7 @@ open class WrappedEvent(
     @JsonProperty("created_at")
     createdAt: Long,
     kind: Int,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -440,7 +445,7 @@ open class BaseAddressableEvent(
     pubKey: HexKey,
     createdAt: Long,
     kind: Int,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ): Event(id, pubKey, createdAt, kind, tags, content, sig), AddressableEvent {

quartz/src/main/java/com/vitorpamplona/quartz/events/EventFactory.kt

@@ -10,7 +10,7 @@ class EventFactory {
             pubKey: String,
             createdAt: Long,
             kind: Int,
-            tags: List<List<String>>,
+            tags: Array<Array<String>>,
             content: String,
             sig: String
         ) = when (kind) {

quartz/src/main/java/com/vitorpamplona/quartz/events/EventInterface.kt

@@ -17,7 +17,7 @@ interface EventInterface {
 
     fun kind(): Int
 
-    fun tags(): List<List<String>>
+    fun tags(): Array<Array<String>>
 
     fun content(): String
 

quartz/src/main/java/com/vitorpamplona/quartz/events/FileHeaderEvent.kt

@@ -13,7 +13,7 @@ class FileHeaderEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -62,20 +62,20 @@ class FileHeaderEvent(
             onReady: (FileHeaderEvent) -> Unit
         ) {
             val tags = listOfNotNull(
-                listOf(URL, url),
+                arrayOf(URL, url),
-                mimeType?.let { listOf(MIME_TYPE, mimeType) },
+                mimeType?.let { arrayOf(MIME_TYPE, mimeType) },
-                alt?.ifBlank { null }?.let { listOf(ALT, it) },
+                alt?.ifBlank { null }?.let { arrayOf(ALT, it) },
-                hash?.let { listOf(HASH, it) },
+                hash?.let { arrayOf(HASH, it) },
-                size?.let { listOf(FILE_SIZE, it) },
+                size?.let { arrayOf(FILE_SIZE, it) },
-                dimensions?.let { listOf(DIMENSION, it) },
+                dimensions?.let { arrayOf(DIMENSION, it) },
-                blurhash?.let { listOf(BLUR_HASH, it) },
+                blurhash?.let { arrayOf(BLUR_HASH, it) },
-                magnetURI?.let { listOf(MAGNET_URI, it) },
+                magnetURI?.let { arrayOf(MAGNET_URI, it) },
 
-                torrentInfoHash?.let { listOf(TORRENT_INFOHASH, it) },
+                torrentInfoHash?.let { arrayOf(TORRENT_INFOHASH, it) },
-                encryptionKey?.let { listOf(ENCRYPTION_KEY, it.key, it.nonce) },
+                encryptionKey?.let { arrayOf(ENCRYPTION_KEY, it.key, it.nonce) },
                 sensitiveContent?.let {
                     if (it) {
-                        listOf("content-warning", "")
+                        arrayOf("content-warning", "")
                     } else {
                         null
                     }
@@ -83,7 +83,7 @@ class FileHeaderEvent(
             )
 
             val content = alt ?: ""
-            signer.sign(createdAt, kind, tags, content, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/FileStorageEvent.kt

@@ -14,7 +14,7 @@ class FileStorageEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -49,11 +49,11 @@ class FileStorageEvent(
             onReady: (FileStorageEvent) -> Unit
         ) {
             val tags = listOfNotNull(
-                listOf(TYPE, mimeType)
+                arrayOf(TYPE, mimeType)
             )
 
             val content = encode(data)
-            signer.sign(createdAt, kind, tags, content, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/FileStorageHeaderEvent.kt

@@ -12,7 +12,7 @@ class FileStorageHeaderEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -59,19 +59,19 @@ class FileStorageHeaderEvent(
             onReady: (FileStorageHeaderEvent) -> Unit
         ) {
             val tags = listOfNotNull(
-                listOf("e", storageEvent.id),
+                arrayOf("e", storageEvent.id),
-                mimeType?.let { listOf(MIME_TYPE, mimeType) },
+                mimeType?.let { arrayOf(MIME_TYPE, mimeType) },
-                hash?.let { listOf(HASH, it) },
+                hash?.let { arrayOf(HASH, it) },
-                alt?.let { listOf(ALT, it) },
+                alt?.let { arrayOf(ALT, it) },
-                size?.let { listOf(FILE_SIZE, it) },
+                size?.let { arrayOf(FILE_SIZE, it) },
-                dimensions?.let { listOf(DIMENSION, it) },
+                dimensions?.let { arrayOf(DIMENSION, it) },
-                blurhash?.let { listOf(BLUR_HASH, it) },
+                blurhash?.let { arrayOf(BLUR_HASH, it) },
-                magnetURI?.let { listOf(MAGNET_URI, it) },
+                magnetURI?.let { arrayOf(MAGNET_URI, it) },
-                torrentInfoHash?.let { listOf(TORRENT_INFOHASH, it) },
+                torrentInfoHash?.let { arrayOf(TORRENT_INFOHASH, it) },
-                encryptionKey?.let { listOf(ENCRYPTION_KEY, it.key, it.nonce) },
+                encryptionKey?.let { arrayOf(ENCRYPTION_KEY, it.key, it.nonce) },
                 sensitiveContent?.let {
                     if (it) {
-                        listOf("content-warning", "")
+                        arrayOf("content-warning", "")
                     } else {
                         null
                     }
@@ -79,7 +79,7 @@ class FileStorageHeaderEvent(
             )
 
             val content = alt ?: ""
-            signer.sign(createdAt, kind, tags, content, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/GeneralListEvent.kt

@@ -17,12 +17,12 @@ abstract class GeneralListEvent(
     pubKey: HexKey,
     createdAt: Long,
     kind: Int,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
     @Transient
-    private var privateTagsCache: List<List<String>>? = null
+    private var privateTagsCache: Array<Array<String>>? = null
 
     fun category() = dTag()
     fun bookmarkedPosts() = taggedEvents()
@@ -32,11 +32,11 @@ abstract class GeneralListEvent(
     fun title() = tags.firstOrNull { it.size > 1 && it[0] == "title" }?.get(1)
     fun nameOrTitle() = name() ?: title()
 
-    fun cachedPrivateTags(): List<List<String>>? {
+    fun cachedPrivateTags(): Array<Array<String>>? {
         return privateTagsCache
     }
 
-    fun filterTagList(key: String, privateTags: List<List<String>>?): ImmutableSet<String> {
+    fun filterTagList(key: String, privateTags: Array<Array<String>>?): ImmutableSet<String> {
         val privateUserList = privateTags?.let {
             it.filter { it.size > 1 && it[0] == key }.map { it[1] }.toSet()
         } ?: emptySet()
@@ -57,7 +57,7 @@ abstract class GeneralListEvent(
         }
     }
 
-    fun privateTags(signer: NostrSigner, onReady: (List<List<String>>) -> Unit) {
+    fun privateTags(signer: NostrSigner, onReady: (Array<Array<String>>) -> Unit) {
         if (content.isBlank()) return
 
         privateTagsCache?.let {
@@ -67,7 +67,7 @@ abstract class GeneralListEvent(
 
         try {
             signer.nip04Decrypt(content, pubKey) {
-                privateTagsCache = mapper.readValue<List<List<String>>>(it)
+                privateTagsCache = mapper.readValue<Array<Array<String>>>(it)
                 privateTagsCache?.let {
                     onReady(it)
                 }
@@ -77,7 +77,7 @@ abstract class GeneralListEvent(
         }
     }
 
-    fun privateTagsOrEmpty(signer: NostrSigner, onReady: (List<List<String>>) -> Unit) {
+    fun privateTagsOrEmpty(signer: NostrSigner, onReady: (Array<Array<String>>) -> Unit) {
         privateTags(signer, onReady)
     }
 
@@ -97,23 +97,23 @@ abstract class GeneralListEvent(
         onReady(filterAddresses(it))
     }
 
-    fun filterUsers(tags: List<List<String>>): List<String> {
+    fun filterUsers(tags: Array<Array<String>>): List<String> {
         return tags.filter { it.size > 1 && it[0] == "p" }.map { it[1] }
     }
 
-    fun filterHashtags(tags: List<List<String>>): List<String> {
+    fun filterHashtags(tags: Array<Array<String>>): List<String> {
         return tags.filter { it.size > 1 && it[0] == "t" }.map { it[1] }
     }
 
-    fun filterGeohashes(tags: List<List<String>>): List<String> {
+    fun filterGeohashes(tags: Array<Array<String>>): List<String> {
         return tags.filter { it.size > 1 && it[0] == "g" }.map { it[1] }
     }
 
-    fun filterEvents(tags: List<List<String>>): List<String> {
+    fun filterEvents(tags: Array<Array<String>>): List<String> {
         return tags.filter { it.size > 1 && it[0] == "e" }.map { it[1] }
     }
 
-    fun filterAddresses(tags: List<List<String>>): List<ATag> {
+    fun filterAddresses(tags: Array<Array<String>>): List<ATag> {
         return tags.filter { it.firstOrNull() == "a" }.mapNotNull {
             val aTagValue = it.getOrNull(1)
             val relay = it.getOrNull(2)
@@ -131,22 +131,22 @@ abstract class GeneralListEvent(
             signer: NostrSigner,
             onReady: (String) -> Unit
         ) {
-            val privTags = mutableListOf<List<String>>()
+            val privTags = mutableListOf<Array<String>>()
             privEvents?.forEach {
-                privTags.add(listOf("e", it))
+                privTags.add(arrayOf("e", it))
             }
             privUsers?.forEach {
-                privTags.add(listOf("p", it))
+                privTags.add(arrayOf("p", it))
             }
             privAddresses?.forEach {
-                privTags.add(listOf("a", it.toTag()))
+                privTags.add(arrayOf("a", it.toTag()))
             }
 
-            return encryptTags(privTags, signer, onReady)
+            return encryptTags(privTags.toTypedArray(), signer, onReady)
         }
 
         fun encryptTags(
-            privateTags: List<List<String>>? = null,
+            privateTags: Array<Array<String>>? = null,
             signer: NostrSigner,
             onReady: (String) -> Unit
         ) {

quartz/src/main/java/com/vitorpamplona/quartz/events/GenericRepostEvent.kt

@@ -13,7 +13,7 @@ class GenericRepostEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -38,18 +38,18 @@ class GenericRepostEvent(
         ) {
             val content = boostedPost.toJson()
 
-            val replyToPost = listOf("e", boostedPost.id())
+            val replyToPost = arrayOf("e", boostedPost.id())
-            val replyToAuthor = listOf("p", boostedPost.pubKey())
+            val replyToAuthor = arrayOf("p", boostedPost.pubKey())
 
-            var tags: List<List<String>> = listOf(replyToPost, replyToAuthor)
+            var tags: List<Array<String>> = listOf(replyToPost, replyToAuthor)
 
             if (boostedPost is AddressableEvent) {
-                tags = tags + listOf(listOf("a", boostedPost.address().toTag()))
+                tags = tags + listOf(arrayOf("a", boostedPost.address().toTag()))
             }
 
-            tags = tags + listOf(listOf("k", "${boostedPost.kind()}"))
+            tags = tags + listOf(arrayOf("k", "${boostedPost.kind()}"))
 
-            signer.sign(createdAt, kind, tags, content, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/GiftWrapEvent.kt

@@ -19,7 +19,7 @@ class GiftWrapEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -71,7 +71,7 @@ class GiftWrapEvent(
         ) {
             val signer = NostrSignerInternal(KeyPair()) // GiftWrap is always a random key
             val serializedContent = toJson(event)
-            val tags = listOf(listOf("p", recipientPubKey))
+            val tags = arrayOf(arrayOf("p", recipientPubKey))
 
             signer.nip44Encrypt(serializedContent, recipientPubKey) {
                 signer.sign(createdAt, kind, tags, it, onReady)

quartz/src/main/java/com/vitorpamplona/quartz/events/HTTPAuthorizationEvent.kt

@@ -13,7 +13,7 @@ class HTTPAuthorizationEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -35,12 +35,12 @@ class HTTPAuthorizationEvent(
             }
 
             val tags = listOfNotNull(
-                listOf("u", url),
+                arrayOf("u", url),
-                listOf("method", method),
+                arrayOf("method", method),
-                listOf("payload", hash)
+                arrayOf("payload", hash)
             )
 
-            signer.sign(createdAt, kind, tags, "", onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), "", onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/HighlightEvent.kt

@@ -12,7 +12,7 @@ class HighlightEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseTextNoteEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -32,7 +32,7 @@ class HighlightEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (HighlightEvent) -> Unit
         ) {
-            signer.sign(createdAt, kind, emptyList(), msg, onReady)
+            signer.sign(createdAt, kind, emptyArray(), msg, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/LiveActivitiesChatMessageEvent.kt

@@ -14,7 +14,7 @@ class LiveActivitiesChatMessageEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseTextNoteEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -60,28 +60,28 @@ class LiveActivitiesChatMessageEvent(
         ) {
             val content = message
             val tags = mutableListOf(
-                listOf("a", activity.toTag(), "", "root")
+                arrayOf("a", activity.toTag(), "", "root")
             )
             replyTos?.forEach {
-                tags.add(listOf("e", it))
+                tags.add(arrayOf("e", it))
             }
             mentions?.forEach {
-                tags.add(listOf("p", it))
+                tags.add(arrayOf("p", it))
             }
             zapReceiver?.forEach {
-                tags.add(listOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
+                tags.add(arrayOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
             }
             if (markAsSensitive) {
-                tags.add(listOf("content-warning", ""))
+                tags.add(arrayOf("content-warning", ""))
             }
             zapRaiserAmount?.let {
-                tags.add(listOf("zapraiser", "$it"))
+                tags.add(arrayOf("zapraiser", "$it"))
             }
             geohash?.let {
                 tags.addAll(geohashMipMap(it))
             }
 
-            signer.sign(createdAt, kind, tags, content, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/LiveActivitiesEvent.kt

@@ -13,7 +13,7 @@ class LiveActivitiesEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -55,7 +55,7 @@ class LiveActivitiesEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (LiveActivitiesEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/LnZapEvent.kt

@@ -10,7 +10,7 @@ class LnZapEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : LnZapEventInterface, Event(id, pubKey, createdAt, kind, tags, content, sig) {

quartz/src/main/java/com/vitorpamplona/quartz/events/LnZapPaymentRequestEvent.kt

@@ -18,7 +18,7 @@ class LnZapPaymentRequestEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -66,8 +66,7 @@ class LnZapPaymentRequestEvent(
         ) {
             val serializedRequest = mapper.writeValueAsString(PayInvoiceMethod.create(lnInvoice))
 
-            val tags = mutableListOf<List<String>>()
+            val tags = arrayOf(arrayOf("p", walletServicePubkey))
-            tags.add(listOf("p", walletServicePubkey))
 
             signer.nip04Encrypt(
                 serializedRequest,

quartz/src/main/java/com/vitorpamplona/quartz/events/LnZapPaymentResponseEvent.kt

@@ -16,7 +16,7 @@ class LnZapPaymentResponseEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {

quartz/src/main/java/com/vitorpamplona/quartz/events/LnZapPrivateEvent.kt

@@ -21,7 +21,7 @@ class LnZapPrivateEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -31,7 +31,7 @@ class LnZapPrivateEvent(
 
         fun create(
             signer: NostrSigner,
-            tags: List<List<String>> = emptyList(),
+            tags: Array<Array<String>> = emptyArray(),
             content: String = "",
             createdAt: Long = TimeUtils.now(),
             onReady: (LnZapPrivateEvent) -> Unit

quartz/src/main/java/com/vitorpamplona/quartz/events/LnZapRequestEvent.kt

@@ -22,7 +22,7 @@ class LnZapRequestEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -89,25 +89,25 @@ class LnZapRequestEvent(
             if (zapType == LnZapEvent.ZapType.NONZAP) return
 
             var tags = listOf(
-                listOf("e", originalNote.id()),
+                arrayOf("e", originalNote.id()),
-                listOf("p", toUserPubHex ?: originalNote.pubKey()),
+                arrayOf("p", toUserPubHex ?: originalNote.pubKey()),
-                listOf("relays") + relays
+                arrayOf("relays") + relays
             )
             if (originalNote is AddressableEvent) {
-                tags = tags + listOf(listOf("a", originalNote.address().toTag()))
+                tags = tags + listOf(arrayOf("a", originalNote.address().toTag()))
             }
             if (pollOption != null && pollOption >= 0) {
-                tags = tags + listOf(listOf(POLL_OPTION, pollOption.toString()))
+                tags = tags + listOf(arrayOf(POLL_OPTION, pollOption.toString()))
             }
 
             if (zapType == LnZapEvent.ZapType.ANONYMOUS) {
-                tags = tags + listOf(listOf("anon"))
+                tags = tags + listOf(arrayOf("anon"))
-                NostrSignerInternal(KeyPair()).sign(createdAt, kind, tags, message, onReady)
+                NostrSignerInternal(KeyPair()).sign(createdAt, kind, tags.toTypedArray(), message, onReady)
             } else if (zapType == LnZapEvent.ZapType.PRIVATE) {
-                tags = tags + listOf(listOf("anon", ""))
+                tags = tags + listOf(arrayOf("anon", ""))
-                signer.sign(createdAt, kind, tags, message, onReady)
+                signer.sign(createdAt, kind, tags.toTypedArray(), message, onReady)
             } else {
-                signer.sign(createdAt, kind, tags, message, onReady)
+                signer.sign(createdAt, kind, tags.toTypedArray(), message, onReady)
             }
         }
 
@@ -122,16 +122,16 @@ class LnZapRequestEvent(
         ) {
             if (zapType == LnZapEvent.ZapType.NONZAP) return
 
-            var tags = listOf(
+            var tags = arrayOf(
-                listOf("p", userHex),
+                arrayOf("p", userHex),
-                listOf("relays") + relays
+                arrayOf("relays") + relays
             )
 
             if (zapType == LnZapEvent.ZapType.ANONYMOUS) {
-                tags = tags + listOf(listOf("anon", ""))
+                tags += arrayOf(arrayOf("anon", ""))
                 NostrSignerInternal(KeyPair()).sign(createdAt, kind, tags, message, onReady)
             } else if (zapType == LnZapEvent.ZapType.PRIVATE) {
-                tags = tags + listOf(listOf("anon", ""))
+                tags += arrayOf(arrayOf("anon", ""))
                 signer.sign(createdAt, kind, tags, message, onReady)
             } else {
                 signer.sign(createdAt, kind, tags, message, onReady)

quartz/src/main/java/com/vitorpamplona/quartz/events/LongTextNoteEvent.kt

@@ -13,7 +13,7 @@ class LongTextNoteEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseTextNoteEvent(id, pubKey, createdAt, kind, tags, content, sig), AddressableEvent {
@@ -42,14 +42,14 @@ class LongTextNoteEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (LongTextNoteEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
             replyTos?.forEach {
-                tags.add(listOf("e", it))
+                tags.add(arrayOf("e", it))
             }
             mentions?.forEach {
-                tags.add(listOf("p", it))
+                tags.add(arrayOf("p", it))
             }
-            signer.sign(createdAt, kind, tags, msg, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), msg, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/MetadataEvent.kt

@@ -123,7 +123,7 @@ class MetadataEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -157,13 +157,13 @@ class MetadataEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (MetadataEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
 
             identities.forEach {
-                tags.add(listOf("i", it.platformIdentity(), it.proof))
+                tags.add(arrayOf("i", it.platformIdentity(), it.proof))
             }
 
-            signer.sign(createdAt, kind, tags, contactMetaData, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), contactMetaData, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/MuteListEvent.kt

@@ -18,7 +18,7 @@ class MuteListEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : GeneralListEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -61,10 +61,10 @@ class MuteListEvent(
 
         fun createListWithTag(key: String, tag: String, isPrivate: Boolean, signer: NostrSigner, createdAt: Long = TimeUtils.now(), onReady: (MuteListEvent) -> Unit) {
             if (isPrivate) {
-                encryptTags(listOf(listOf(key, tag)), signer) { encryptedTags ->
+                encryptTags(arrayOf(arrayOf(key, tag)), signer) { encryptedTags ->
                     create(
                         content = encryptedTags,
-                        tags = emptyList(),
+                        tags = emptyArray(),
                         signer = signer,
                         createdAt = createdAt,
                         onReady = onReady
@@ -73,7 +73,7 @@ class MuteListEvent(
             } else {
                 create(
                     content = "",
-                    tags = listOf(listOf(key, tag)),
+                    tags = arrayOf(arrayOf(key, tag)),
                     signer = signer,
                     createdAt = createdAt,
                     onReady = onReady
@@ -95,7 +95,7 @@ class MuteListEvent(
                     encryptTags(
                         privateTags = privateTags.plus(
                             listPubKeyHex.map {
-                                listOf("p", it)
+                                arrayOf("p", it)
                             }
                         ),
                         signer = signer
@@ -114,7 +114,7 @@ class MuteListEvent(
                     content = earlierVersion.content,
                     tags = earlierVersion.tags.plus(
                         listPubKeyHex.map {
-                            listOf("p", it)
+                            arrayOf("p", it)
                         }
                     ),
                     signer = signer,
@@ -138,7 +138,7 @@ class MuteListEvent(
                     if (isPrivate) {
                         earlierVersion.privateTagsOrEmpty(signer) { privateTags ->
                             encryptTags(
-                                privateTags = privateTags.plus(element = listOf(key, tag)),
+                                privateTags = privateTags.plus(element = arrayOf(key, tag)),
                                 signer = signer
                             ) { encryptedTags ->
                                 create(
@@ -153,7 +153,7 @@ class MuteListEvent(
                     } else {
                         create(
                             content = earlierVersion.content,
-                            tags = earlierVersion.tags.plus(element = listOf(key, tag)),
+                            tags = earlierVersion.tags.plus(element = arrayOf(key, tag)),
                             signer = signer,
                             createdAt = createdAt,
                             onReady = onReady
@@ -177,12 +177,12 @@ class MuteListEvent(
                     if (isPrivate) {
                         earlierVersion.privateTagsOrEmpty(signer) { privateTags ->
                             encryptTags(
-                                privateTags = privateTags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) },
+                                privateTags = privateTags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) }.toTypedArray(),
                                 signer = signer
                             ) { encryptedTags ->
                                 create(
                                     content = encryptedTags,
-                                    tags = earlierVersion.tags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) },
+                                    tags = earlierVersion.tags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) }.toTypedArray(),
                                     signer = signer,
                                     createdAt = createdAt,
                                     onReady = onReady
@@ -192,7 +192,7 @@ class MuteListEvent(
                     } else {
                         create(
                             content = earlierVersion.content,
-                            tags = earlierVersion.tags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) },
+                            tags = earlierVersion.tags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) }.toTypedArray(),
                             signer = signer,
                             createdAt = createdAt,
                             onReady = onReady
@@ -204,7 +204,7 @@ class MuteListEvent(
 
         fun create(
             content: String,
-            tags: List<List<String>>,
+            tags: Array<Array<String>>,
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
             onReady: (MuteListEvent) -> Unit

quartz/src/main/java/com/vitorpamplona/quartz/events/NNSEvent.kt

@@ -13,7 +13,7 @@ class NNSEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -29,7 +29,7 @@ class NNSEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (NNSEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = emptyArray<Array<String>>()
             signer.sign(createdAt, kind, tags, "", onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/PeopleListEvent.kt

@@ -15,7 +15,7 @@ class PeopleListEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : GeneralListEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -94,10 +94,10 @@ class PeopleListEvent(
 
         fun createListWithTag(name: String, key: String, tag: String, isPrivate: Boolean, signer: NostrSigner, createdAt: Long = TimeUtils.now(), onReady: (PeopleListEvent) -> Unit) {
             if (isPrivate) {
-                encryptTags(listOf(listOf(key, tag)), signer) { encryptedTags ->
+                encryptTags(arrayOf(arrayOf(key, tag)), signer) { encryptedTags ->
                     create(
                         content = encryptedTags,
-                        tags = listOf(listOf("d", name)),
+                        tags = arrayOf(arrayOf("d", name)),
                         signer = signer,
                         createdAt = createdAt,
                         onReady = onReady
@@ -106,7 +106,7 @@ class PeopleListEvent(
             } else {
                 create(
                     content = "",
-                    tags = listOf(listOf("d", name), listOf(key, tag)),
+                    tags = arrayOf(arrayOf("d", name), arrayOf(key, tag)),
                     signer = signer,
                     createdAt = createdAt,
                     onReady = onReady
@@ -128,7 +128,7 @@ class PeopleListEvent(
                     encryptTags(
                         privateTags = privateTags.plus(
                             listPubKeyHex.map {
-                                listOf("p", it)
+                                arrayOf("p", it)
                             }
                         ),
                         signer = signer
@@ -147,7 +147,7 @@ class PeopleListEvent(
                     content = earlierVersion.content,
                     tags = earlierVersion.tags.plus(
                         listPubKeyHex.map {
-                            listOf("p", it)
+                            arrayOf("p", it)
                         }
                     ),
                     signer = signer,
@@ -171,7 +171,7 @@ class PeopleListEvent(
                     if (isPrivate) {
                         earlierVersion.privateTagsOrEmpty(signer) { privateTags ->
                             encryptTags(
-                                privateTags = privateTags.plus(element = listOf(key, tag)),
+                                privateTags = privateTags.plus(element = arrayOf(key, tag)),
                                 signer = signer
                             ) { encryptedTags ->
                                 create(
@@ -186,7 +186,7 @@ class PeopleListEvent(
                     } else {
                         create(
                             content = earlierVersion.content,
-                            tags = earlierVersion.tags.plus(element = listOf(key, tag)),
+                            tags = earlierVersion.tags.plus(element = arrayOf(key, tag)),
                             signer = signer,
                             createdAt = createdAt,
                             onReady = onReady
@@ -210,12 +210,12 @@ class PeopleListEvent(
                     if (isPrivate) {
                         earlierVersion.privateTagsOrEmpty(signer) { privateTags ->
                             encryptTags(
-                                privateTags = privateTags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) },
+                                privateTags = privateTags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) }.toTypedArray(),
                                 signer = signer
                             ) { encryptedTags ->
                                 create(
                                     content = encryptedTags,
-                                    tags = earlierVersion.tags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) },
+                                    tags = earlierVersion.tags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) }.toTypedArray(),
                                     signer = signer,
                                     createdAt = createdAt,
                                     onReady = onReady
@@ -225,7 +225,7 @@ class PeopleListEvent(
                     } else {
                         create(
                             content = earlierVersion.content,
-                            tags = earlierVersion.tags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) },
+                            tags = earlierVersion.tags.filter { it.size > 1 && !(it[0] == key && it[1] == tag) }.toTypedArray(),
                             signer = signer,
                             createdAt = createdAt,
                             onReady = onReady
@@ -237,7 +237,7 @@ class PeopleListEvent(
 
         fun create(
             content: String,
-            tags: List<List<String>>,
+            tags: Array<Array<String>>,
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
             onReady: (PeopleListEvent) -> Unit

quartz/src/main/java/com/vitorpamplona/quartz/events/PinListEvent.kt

@@ -13,7 +13,7 @@ class PinListEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -29,12 +29,12 @@ class PinListEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (PinListEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
             pins.forEach {
-                tags.add(listOf("pin", it))
+                tags.add(arrayOf("pin", it))
             }
 
-            signer.sign(createdAt, kind, tags, "", onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), "", onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/PollNoteEvent.kt

@@ -19,7 +19,7 @@ class PollNoteEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     // ots: String?, TODO implement OTS: https://github.com/opentimestamps/java-opentimestamps
     content: String,
     sig: HexKey
@@ -62,45 +62,45 @@ class PollNoteEvent(
             geohash: String? = null,
             onReady: (PollNoteEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
             replyTos?.forEach {
-                tags.add(listOf("e", it))
+                tags.add(arrayOf("e", it))
             }
             mentions?.forEach {
-                tags.add(listOf("p", it))
+                tags.add(arrayOf("p", it))
             }
             addresses?.forEach {
-                tags.add(listOf("a", it.toTag()))
+                tags.add(arrayOf("a", it.toTag()))
             }
             pollOptions.forEach { poll_op ->
-                tags.add(listOf(POLL_OPTION, poll_op.key.toString(), poll_op.value))
+                tags.add(arrayOf(POLL_OPTION, poll_op.key.toString(), poll_op.value))
             }
             valueMaximum?.let {
-                tags.add(listOf(VALUE_MAXIMUM, valueMaximum.toString()))
+                tags.add(arrayOf(VALUE_MAXIMUM, valueMaximum.toString()))
             }
             valueMinimum?.let {
-                tags.add(listOf(VALUE_MINIMUM, valueMinimum.toString()))
+                tags.add(arrayOf(VALUE_MINIMUM, valueMinimum.toString()))
             }
             consensusThreshold?.let {
-                tags.add(listOf(CONSENSUS_THRESHOLD, consensusThreshold.toString()))
+                tags.add(arrayOf(CONSENSUS_THRESHOLD, consensusThreshold.toString()))
             }
             closedAt?.let {
-                tags.add(listOf(CLOSED_AT, closedAt.toString()))
+                tags.add(arrayOf(CLOSED_AT, closedAt.toString()))
             }
             zapReceiver?.forEach {
-                tags.add(listOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
+                tags.add(arrayOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
             }
             if (markAsSensitive) {
-                tags.add(listOf("content-warning", ""))
+                tags.add(arrayOf("content-warning", ""))
             }
             zapRaiserAmount?.let {
-                tags.add(listOf("zapraiser", "$it"))
+                tags.add(arrayOf("zapraiser", "$it"))
             }
             geohash?.let {
                 tags.addAll(geohashMipMap(it))
             }
 
-            signer.sign(createdAt, kind, tags, msg, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), msg, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/PrivateDmEvent.kt

@@ -19,7 +19,7 @@ class PrivateDmEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig), ChatroomKeyable {
@@ -109,38 +109,38 @@ class PrivateDmEvent(
             onReady: (PrivateDmEvent) -> Unit
         ) {
             val message = if (advertiseNip18) { nip18Advertisement } else { "" } + msg
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
             publishedRecipientPubKey?.let {
-                tags.add(listOf("p", publishedRecipientPubKey))
+                tags.add(arrayOf("p", publishedRecipientPubKey))
             }
             replyTos?.forEach {
-                tags.add(listOf("e", it))
+                tags.add(arrayOf("e", it))
             }
             mentions?.forEach {
-                tags.add(listOf("p", it))
+                tags.add(arrayOf("p", it))
             }
             zapReceiver?.forEach {
-                tags.add(listOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
+                tags.add(arrayOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
             }
             if (markAsSensitive) {
-                tags.add(listOf("content-warning", ""))
+                tags.add(arrayOf("content-warning", ""))
             }
             zapRaiserAmount?.let {
-                tags.add(listOf("zapraiser", "$it"))
+                tags.add(arrayOf("zapraiser", "$it"))
             }
             geohash?.let {
                 tags.addAll(geohashMipMap(it))
             }
 
             signer.nip04Encrypt(message, recipientPubKey) { content ->
-                signer.sign(createdAt, kind, tags, content, onReady)
+                signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
             }
         }
     }
 }
 
-fun geohashMipMap(geohash: String): List<List<String>> {
+fun geohashMipMap(geohash: String): Array<Array<String>> {
     return geohash.indices.asSequence().map {
-        listOf("g", geohash.substring(0, it+1))
+        arrayOf("g", geohash.substring(0, it+1))
-    }.toList().reversed()
+    }.toList().reversed().toTypedArray()
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/ReactionEvent.kt

@@ -13,7 +13,7 @@ class ReactionEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -33,25 +33,25 @@ class ReactionEvent(
         }
 
         fun create(content: String, originalNote: EventInterface, signer: NostrSigner, createdAt: Long = TimeUtils.now(), onReady: (ReactionEvent) -> Unit) {
-            var tags = listOf(listOf("e", originalNote.id()), listOf("p", originalNote.pubKey()))
+            var tags = listOf(arrayOf("e", originalNote.id()), arrayOf("p", originalNote.pubKey()))
             if (originalNote is AddressableEvent) {
-                tags = tags + listOf(listOf("a", originalNote.address().toTag()))
+                tags = tags + listOf(arrayOf("a", originalNote.address().toTag()))
             }
 
-            return signer.sign(createdAt, kind, tags, content, onReady)
+            return signer.sign(createdAt, kind, tags.toTypedArray(), content, onReady)
         }
 
         fun create(emojiUrl: EmojiUrl, originalNote: EventInterface, signer: NostrSigner, createdAt: Long = TimeUtils.now(), onReady: (ReactionEvent) -> Unit) {
             val content = ":${emojiUrl.code}:"
 
-            var tags = listOf(
+            var tags = arrayOf(
-                listOf("e", originalNote.id()),
+                arrayOf("e", originalNote.id()),
-                listOf("p", originalNote.pubKey()),
+                arrayOf("p", originalNote.pubKey()),
-                listOf("emoji", emojiUrl.code, emojiUrl.url)
+                arrayOf("emoji", emojiUrl.code, emojiUrl.url)
             )
 
             if (originalNote is AddressableEvent) {
-                tags = tags + listOf(listOf("a", originalNote.address().toTag()))
+                tags += arrayOf(arrayOf("a", originalNote.address().toTag()))
             }
 
             signer.sign(createdAt, kind, tags, content, onReady)

quartz/src/main/java/com/vitorpamplona/quartz/events/RecommendRelayEvent.kt

@@ -13,7 +13,7 @@ class RecommendRelayEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -30,8 +30,7 @@ class RecommendRelayEvent(
             onReady: (RecommendRelayEvent) -> Unit
         ) {
             val content = relay.toString()
-            val tags = listOf<List<String>>()
+            signer.sign(createdAt, kind, emptyArray(), content, onReady)
-            signer.sign(createdAt, kind, tags, content, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/RelayAuthEvent.kt

@@ -12,7 +12,7 @@ class RelayAuthEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -30,9 +30,9 @@ class RelayAuthEvent(
             onReady: (RelayAuthEvent) -> Unit
         ) {
             val content = ""
-            val tags = listOf(
+            val tags = arrayOf(
-                listOf("relay", relay),
+                arrayOf("relay", relay),
-                listOf("challenge", challenge)
+                arrayOf("challenge", challenge)
             )
             signer.sign(createdAt, kind, tags, content, onReady)
         }

quartz/src/main/java/com/vitorpamplona/quartz/events/RelaySetEvent.kt

@@ -13,7 +13,7 @@ class RelaySetEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -29,12 +29,12 @@ class RelaySetEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (RelaySetEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
             relays.forEach {
-                tags.add(listOf("r", it))
+                tags.add(arrayOf("r", it))
             }
 
-            signer.sign(createdAt, kind, tags, "", onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), "", onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/ReportEvent.kt

@@ -17,7 +17,7 @@ class ReportEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -63,13 +63,13 @@ class ReportEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (ReportEvent) -> Unit
         ) {
-            val reportPostTag = listOf("e", reportedPost.id(), type.name.lowercase())
+            val reportPostTag = arrayOf("e", reportedPost.id(), type.name.lowercase())
-            val reportAuthorTag = listOf("p", reportedPost.pubKey(), type.name.lowercase())
+            val reportAuthorTag = arrayOf("p", reportedPost.pubKey(), type.name.lowercase())
 
-            var tags: List<List<String>> = listOf(reportPostTag, reportAuthorTag)
+            var tags: Array<Array<String>> = arrayOf(reportPostTag, reportAuthorTag)
 
             if (reportedPost is AddressableEvent) {
-                tags = tags + listOf(listOf("a", reportedPost.address().toTag()))
+                tags = tags + listOf(arrayOf("a", reportedPost.address().toTag()))
             }
 
             signer.sign(createdAt, kind, tags, content, onReady)
@@ -84,9 +84,9 @@ class ReportEvent(
         ) {
             val content = ""
 
-            val reportAuthorTag = listOf("p", reportedUser, type.name.lowercase())
+            val reportAuthorTag = arrayOf("p", reportedUser, type.name.lowercase())
 
-            val tags: List<List<String>> = listOf(reportAuthorTag)
+            val tags: Array<Array<String>> = arrayOf(reportAuthorTag)
             signer.sign(createdAt, kind, tags, content, onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/RepostEvent.kt

@@ -13,7 +13,7 @@ class RepostEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -38,13 +38,13 @@ class RepostEvent(
         ) {
             val content = boostedPost.toJson()
 
-            val replyToPost = listOf("e", boostedPost.id())
+            val replyToPost = arrayOf("e", boostedPost.id())
-            val replyToAuthor = listOf("p", boostedPost.pubKey())
+            val replyToAuthor = arrayOf("p", boostedPost.pubKey())
 
-            var tags: List<List<String>> = listOf(replyToPost, replyToAuthor)
+            var tags: Array<Array<String>> = arrayOf(replyToPost, replyToAuthor)
 
             if (boostedPost is AddressableEvent) {
-                tags = tags + listOf(listOf("a", boostedPost.address().toTag()))
+                tags = tags + listOf(arrayOf("a", boostedPost.address().toTag()))
             }
 
             signer.sign(createdAt, kind, tags, content, onReady)

quartz/src/main/java/com/vitorpamplona/quartz/events/SealedGossipEvent.kt

@@ -19,7 +19,7 @@ class SealedGossipEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ): WrappedEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -85,10 +85,9 @@ class SealedGossipEvent(
             onReady: (SealedGossipEvent) -> Unit
         ) {
             val msg = Gossip.toJson(gossip)
-            val tags = listOf<List<String>>()
 
             signer.nip44Encrypt(msg, encryptTo) { content ->
-                signer.sign(createdAt, kind, tags, content, onReady)
+                signer.sign(createdAt, kind, emptyArray(), content, onReady)
             }
         }
     }
@@ -101,14 +100,14 @@ class Gossip(
     @JsonProperty("created_at")
     val createdAt: Long?,
     val kind: Int?,
-    val tags: List<List<String>>?,
+    val tags: Array<Array<String>>?,
     val content: String?
 ) {
     fun mergeWith(event: SealedGossipEvent): Event {
         val newPubKey = pubKey?.ifBlank { null } ?: event.pubKey
         val newCreatedAt = if (createdAt != null && createdAt > 1000) createdAt else event.createdAt
         val newKind = kind ?: -1
-        val newTags = (tags ?: emptyList()).plus(event.tags)
+        val newTags = (tags ?: emptyArray()).plus(event.tags)
         val newContent = content ?: ""
         val newID = id?.ifBlank { null } ?: Event.generateId(newPubKey, newCreatedAt, newKind, newTags, newContent).toHexKey()
         val sig = ""

quartz/src/main/java/com/vitorpamplona/quartz/events/StatusEvent.kt

@@ -14,7 +14,7 @@ class StatusEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseAddressableEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -30,12 +30,12 @@ class StatusEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (StatusEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
 
-            tags.add(listOf("d", type))
+            tags.add(arrayOf("d", type))
-            expiration?.let { tags.add(listOf("expiration", it.toString())) }
+            expiration?.let { tags.add(arrayOf("expiration", it.toString())) }
 
-            signer.sign(createdAt, kind, tags, msg, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), msg, onReady)
         }
 
         fun update(
@@ -57,7 +57,7 @@ class StatusEvent(
         ) {
             val msg = ""
             val tags = event.tags.filter { it.size > 1 && it[0] == "d" }
-            signer.sign(createdAt, kind, tags, msg, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), msg, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/events/TextNoteEvent.kt

@@ -16,7 +16,7 @@ class TextNoteEvent(
     id: HexKey,
     pubKey: HexKey,
     createdAt: Long,
-    tags: List<List<String>>,
+    tags: Array<Array<String>>,
     content: String,
     sig: HexKey
 ) : BaseTextNoteEvent(id, pubKey, createdAt, kind, tags, content, sig) {
@@ -43,61 +43,61 @@ class TextNoteEvent(
             createdAt: Long = TimeUtils.now(),
             onReady: (TextNoteEvent) -> Unit
         ) {
-            val tags = mutableListOf<List<String>>()
+            val tags = mutableListOf<Array<String>>()
             replyTos?.forEach {
                 if (it == root) {
-                    tags.add(listOf("e", it, "", "root"))
+                    tags.add(arrayOf("e", it, "", "root"))
                 } else if (it == replyingTo) {
-                    tags.add(listOf("e", it, "", "reply"))
+                    tags.add(arrayOf("e", it, "", "reply"))
                 } else if (it in directMentions) {
-                    tags.add(listOf("e", it, "", "mention"))
+                    tags.add(arrayOf("e", it, "", "mention"))
                 } else {
-                    tags.add(listOf("e", it))
+                    tags.add(arrayOf("e", it))
                 }
             }
             mentions?.forEach {
                 if (it in directMentions) {
-                    tags.add(listOf("p", it, "", "mention"))
+                    tags.add(arrayOf("p", it, "", "mention"))
                 } else {
-                    tags.add(listOf("p", it))
+                    tags.add(arrayOf("p", it))
                 }
             }
             addresses?.forEach {
                 val aTag = it.toTag()
                 if (aTag == root) {
-                    tags.add(listOf("a", aTag, "", "root"))
+                    tags.add(arrayOf("a", aTag, "", "root"))
                 } else if (aTag == replyingTo) {
-                    tags.add(listOf("a", aTag, "", "reply"))
+                    tags.add(arrayOf("a", aTag, "", "reply"))
                 } else if (aTag in directMentions) {
-                    tags.add(listOf("a", aTag, "", "mention"))
+                    tags.add(arrayOf("a", aTag, "", "mention"))
                 } else {
-                    tags.add(listOf("a", aTag))
+                    tags.add(arrayOf("a", aTag))
                 }
             }
             findHashtags(msg).forEach {
-                tags.add(listOf("t", it))
+                tags.add(arrayOf("t", it))
-                tags.add(listOf("t", it.lowercase()))
+                tags.add(arrayOf("t", it.lowercase()))
             }
             extraTags?.forEach {
-                tags.add(listOf("t", it))
+                tags.add(arrayOf("t", it))
             }
             zapReceiver?.forEach {
-                tags.add(listOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
+                tags.add(arrayOf("zap", it.lnAddressOrPubKeyHex, it.relay ?: "", it.weight.toString()))
             }
             findURLs(msg).forEach {
-                tags.add(listOf("r", it))
+                tags.add(arrayOf("r", it))
             }
             if (markAsSensitive) {
-                tags.add(listOf("content-warning", ""))
+                tags.add(arrayOf("content-warning", ""))
             }
             zapRaiserAmount?.let {
-                tags.add(listOf("zapraiser", "$it"))
+                tags.add(arrayOf("zapraiser", "$it"))
             }
             geohash?.let {
                 tags.addAll(geohashMipMap(it))
             }
 
-            signer.sign(createdAt, kind, tags, msg, onReady)
+            signer.sign(createdAt, kind, tags.toTypedArray(), msg, onReady)
         }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/signers/NostrSigner.kt

@@ -11,7 +11,7 @@ import kotlinx.coroutines.withContext
 
 abstract class NostrSigner(val pubKey: HexKey) {
 
-    abstract fun <T: Event> sign(createdAt: Long, kind: Int, tags: List<List<String>>, content: String, onReady: (T) -> Unit)
+    abstract fun <T: Event> sign(createdAt: Long, kind: Int, tags: Array<Array<String>>, content: String, onReady: (T) -> Unit)
 
     abstract fun nip04Encrypt(decryptedContent: String, toPublicKey: HexKey, onReady: (String)-> Unit)
     abstract fun nip04Decrypt(encryptedContent: String, fromPublicKey: HexKey, onReady: (String)-> Unit)

quartz/src/main/java/com/vitorpamplona/quartz/signers/NostrSignerExternal.kt

@@ -17,7 +17,7 @@ class NostrSignerExternal(
     override fun <T: Event> sign(
         createdAt: Long,
         kind: Int,
-        tags: List<List<String>>,
+        tags: Array<Array<String>>,
         content: String,
         onReady: (T) -> Unit
     ) {

quartz/src/main/java/com/vitorpamplona/quartz/signers/NostrSignerInternal.kt

@@ -21,7 +21,7 @@ class NostrSignerInternal(val keyPair: KeyPair): NostrSigner(keyPair.pubKey.toHe
     override fun <T: Event> sign(
         createdAt: Long,
         kind: Int,
-        tags: List<List<String>>,
+        tags: Array<Array<String>>,
         content: String,
         onReady: (T)-> Unit
     ) {
@@ -37,7 +37,7 @@ class NostrSignerInternal(val keyPair: KeyPair): NostrSigner(keyPair.pubKey.toHe
 
     fun isUnsignedPrivateEvent(
         kind: Int,
-        tags: List<List<String>>,
+        tags: Array<Array<String>>,
     ): Boolean {
         return kind == LnZapRequestEvent.kind && tags.any { t -> t.size > 1 && t[0] == "anon" && t[1].isBlank() }
     }
@@ -45,7 +45,7 @@ class NostrSignerInternal(val keyPair: KeyPair): NostrSigner(keyPair.pubKey.toHe
     fun <T: Event> signNormal(
         createdAt: Long,
         kind: Int,
-        tags: List<List<String>>,
+        tags: Array<Array<String>>,
         content: String,
         onReady: (T)-> Unit
     ) {
@@ -123,7 +123,7 @@ class NostrSignerInternal(val keyPair: KeyPair): NostrSigner(keyPair.pubKey.toHe
     private fun <T> signPrivateZap(
         createdAt: Long,
         kind: Int,
-        tags: List<List<String>>,
+        tags: Array<Array<String>>,
         content: String,
         onReady: (T)-> Unit
     ) {
@@ -138,7 +138,7 @@ class NostrSignerInternal(val keyPair: KeyPair): NostrSigner(keyPair.pubKey.toHe
         val encryptionPrivateKey =
             LnZapRequestEvent.createEncryptionPrivateKey(keyPair.privKey.toHexKey(), idToGeneratePrivateKey, createdAt)
 
-        val fullTagsNoAnon = tags.filter { t -> t.getOrNull(0) != "anon" }
+        val fullTagsNoAnon = tags.filter { t -> t.getOrNull(0) != "anon" }.toTypedArray()
 
         LnZapPrivateEvent.create(this, fullTagsNoAnon, content) {
             val noteJson = it.toJson()
@@ -148,10 +148,10 @@ class NostrSignerInternal(val keyPair: KeyPair): NostrSigner(keyPair.pubKey.toHe
                 userHex.hexToByteArray()
             )
 
-            val newTags = tags.filter { t -> t.getOrNull(0) != "anon" } + listOf(listOf("anon", encryptedContent))
+            val newTags = tags.filter { t -> t.getOrNull(0) != "anon" } + listOf(arrayOf("anon", encryptedContent))
             val newContent = ""
 
-            NostrSignerInternal(KeyPair(encryptionPrivateKey)).signNormal(createdAt, kind, newTags, newContent, onReady)
+            NostrSignerInternal(KeyPair(encryptionPrivateKey)).signNormal(createdAt, kind, newTags.toTypedArray(), newContent, onReady)
         }
     }