feat: render NIP-42 relay logins (kind 22242) as a login card, not a post

Kind 22242 had no NoteCompose renderer, so signer consent prompts (NIP-46
bunker, napplets) previewed an auth request as an empty text note.

- commonsUI: RelayAuthCard shows "Relay login", a "nothing is posted"
  explainer, each relay (icon + URL) and the challenge; wired into the
  NoteCompose and ThreadFeedView dispatchers.
- Consent: the op label reads "log in to relays as you" instead of
  "sign for Relay Auth (kind: 22242)", and the preview line names the
  relay(s) instead of the empty content (batched rows were blank).
- quartz: TagArray.authRelays()/authChallenge() + RelayAuthEvent.relays().

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GSwjzewTFcwzqAKVJ1WJ9B

amethyst/src/main/java/com/vitorpamplona/amethyst/connectedApps/consent/Nip46ConsentInfoBuilder.kt

@@ -24,8 +24,12 @@ import com.vitorpamplona.amethyst.commons.connectedApps.nip46.Nip46PermissionAut
 import com.vitorpamplona.amethyst.commons.connectedApps.nip46.Nip46PermissionAuthorizer.Companion.toNarrowSignerOp
 import com.vitorpamplona.amethyst.commons.connectedApps.signers.NostrSignerOp
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArray
 import com.vitorpamplona.quartz.nip01Core.jackson.JacksonMapper
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.displayUrl
 import com.vitorpamplona.quartz.nip19Bech32.entities.NPub
+import com.vitorpamplona.quartz.nip42RelayAuth.RelayAuthEvent
+import com.vitorpamplona.quartz.nip42RelayAuth.authRelays
 import com.vitorpamplona.quartz.nip46RemoteSigner.BunkerRequest
 import com.vitorpamplona.quartz.nip46RemoteSigner.BunkerRequestSign
 import com.vitorpamplona.quartz.utils.Log
@@ -91,10 +95,7 @@ object Nip46ConsentInfoBuilder {
 
         val preview =
             when {
-                request is BunkerRequestSign ->
-                    request.event.content
-                        .take(PREVIEW_MAX_CHARS)
-                        .trim()
+                request is BunkerRequestSign -> signPreview(request.event.kind, request.event.tags, request.event.content)
                 plaintext != null -> plaintext.take(PREVIEW_MAX_CHARS).trim()
                 else -> ""
             }
@@ -132,6 +133,22 @@ object Nip46ConsentInfoBuilder {
         )
     }
 
+    /**
+     * The one-line preview of an event an app asks to sign. Usually its content; a NIP-42 relay
+     * login has none, so it names the relay(s) instead — otherwise a batched row reads as a blank
+     * "sign Relay Auth" with nothing to say where the user is logging in.
+     */
+    fun signPreview(
+        kind: Int,
+        tags: TagArray,
+        content: String,
+    ): String =
+        if (kind == RelayAuthEvent.KIND) {
+            tags.authRelays().joinToString(", ") { it.displayUrl() }
+        } else {
+            content.take(PREVIEW_MAX_CHARS).trim()
+        }
+
     /**
      * Decrypts the message the app asked to read. Never throws and never hangs: a signer that fails,
      * refuses, returns nothing, or takes too long yields [failureText], because a request whose

amethyst/src/main/java/com/vitorpamplona/amethyst/napplet/NostrSignerOpLabels.kt

@@ -35,10 +35,12 @@ import com.vitorpamplona.amethyst.commons.resources.napplet_fallback_title
 import com.vitorpamplona.amethyst.commons.resources.napplet_op_decrypt
 import com.vitorpamplona.amethyst.commons.resources.napplet_op_decrypt_from
 import com.vitorpamplona.amethyst.commons.resources.napplet_op_encrypt
+import com.vitorpamplona.amethyst.commons.resources.napplet_op_relay_login
 import com.vitorpamplona.amethyst.commons.resources.napplet_op_sign_kind_named
 import com.vitorpamplona.amethyst.commons.resources.nip46_signer_allow_always_for
 import com.vitorpamplona.amethyst.commons.ui.loadStringRes
 import com.vitorpamplona.amethyst.commons.ui.screen.loggedIn.relays.kindNameFor
+import com.vitorpamplona.amethyst.connectedApps.consent.Nip46ConsentInfoBuilder
 import com.vitorpamplona.amethyst.connectedApps.consent.SignerConnectInfo
 import com.vitorpamplona.amethyst.connectedApps.consent.SignerConsentInfo
 import com.vitorpamplona.quartz.nip01Core.core.Event
@@ -46,12 +48,19 @@ import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.jackson.JacksonMapper
 import com.vitorpamplona.quartz.nip01Core.signers.EventTemplate
 import com.vitorpamplona.quartz.nip19Bech32.entities.NPub
+import com.vitorpamplona.quartz.nip42RelayAuth.RelayAuthEvent
 import com.vitorpamplona.quartz.utils.TimeUtils
 
 /** Human-readable label for a [NostrSignerOp]. */
 suspend fun NostrSignerOp.label(context: Context): String =
     when (this) {
-        is NostrSignerOp.SignKind -> loadStringRes(Res.string.napplet_op_sign_kind_named, kindNameFor(kind), kind)
+        is NostrSignerOp.SignKind ->
+            if (kind == RelayAuthEvent.KIND) {
+                // A relay login is not "signing" anything the user would recognise; say what it does.
+                loadStringRes(Res.string.napplet_op_relay_login)
+            } else {
+                loadStringRes(Res.string.napplet_op_sign_kind_named, kindNameFor(kind), kind)
+            }
         NostrSignerOp.Encrypt -> loadStringRes(Res.string.napplet_op_encrypt)
         NostrSignerOp.Decrypt -> loadStringRes(Res.string.napplet_op_decrypt)
         is NostrSignerOp.DecryptFrom -> loadStringRes(Res.string.napplet_op_decrypt_from, counterpartyLabel(counterparty))
@@ -96,8 +105,8 @@ suspend fun buildSignerConsentInfo(
     val summary = (narrowOp ?: op).label(context)
     val preview =
         when (request) {
-            is NappletRequest.Publish -> request.content.take(160).trim()
-            is NappletRequest.SignEvent -> request.content.take(160).trim()
+            is NappletRequest.Publish -> Nip46ConsentInfoBuilder.signPreview(request.kind, request.tags, request.content)
+            is NappletRequest.SignEvent -> Nip46ConsentInfoBuilder.signPreview(request.kind, request.tags, request.content)
             is NappletRequest.PublishEncrypted -> request.content.take(160).trim()
             // Encryption shows the plaintext the page wants sealed; decryption has only ciphertext,
             // which tells the user nothing, so its preview stays empty and the counterparty in

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/napplets/ConnectedAppDetailScreen.kt

@@ -105,6 +105,7 @@ import com.vitorpamplona.amethyst.commons.resources.napplet_decision_deny
 import com.vitorpamplona.amethyst.commons.resources.napplet_op_decrypt
 import com.vitorpamplona.amethyst.commons.resources.napplet_op_decrypt_from
 import com.vitorpamplona.amethyst.commons.resources.napplet_op_encrypt
+import com.vitorpamplona.amethyst.commons.resources.napplet_op_relay_login
 import com.vitorpamplona.amethyst.commons.resources.napplet_op_sign_kind
 import com.vitorpamplona.amethyst.commons.resources.napplet_permissions_ask_each_time
 import com.vitorpamplona.amethyst.commons.resources.napplet_policy_full_trust
@@ -141,6 +142,7 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.settings.nip46.nip46AppOnli
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.settings.nip46.nip46ClientSubtitle
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
+import com.vitorpamplona.quartz.nip42RelayAuth.RelayAuthEvent
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -838,7 +840,12 @@ private fun GrantOption(
 @Composable
 private fun NostrSignerOp.opLabel(): String =
     when (this) {
-        is NostrSignerOp.SignKind -> stringRes(Res.string.napplet_op_sign_kind, kind)
+        is NostrSignerOp.SignKind ->
+            if (kind == RelayAuthEvent.KIND) {
+                stringRes(Res.string.napplet_op_relay_login)
+            } else {
+                stringRes(Res.string.napplet_op_sign_kind, kind)
+            }
         NostrSignerOp.Encrypt -> stringRes(Res.string.napplet_op_encrypt)
         NostrSignerOp.Decrypt -> stringRes(Res.string.napplet_op_decrypt)
         is NostrSignerOp.DecryptFrom -> stringRes(Res.string.napplet_op_decrypt_from, counterpartyLabel(counterparty))

amethyst/src/test/java/com/vitorpamplona/amethyst/connectedApps/consent/Nip46ConsentInfoBuilderTest.kt

@@ -22,7 +22,9 @@ package com.vitorpamplona.amethyst.connectedApps.consent
 
 import com.vitorpamplona.amethyst.commons.connectedApps.signers.NostrSignerOp
 import com.vitorpamplona.quartz.nip01Core.core.Event
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
 import com.vitorpamplona.quartz.nip01Core.signers.EventTemplate
+import com.vitorpamplona.quartz.nip42RelayAuth.RelayAuthEvent
 import com.vitorpamplona.quartz.nip46RemoteSigner.BunkerRequest
 import com.vitorpamplona.quartz.nip46RemoteSigner.BunkerRequestNip04Decrypt
 import com.vitorpamplona.quartz.nip46RemoteSigner.BunkerRequestNip44Decrypt
@@ -173,4 +175,24 @@ class Nip46ConsentInfoBuilderTest {
             assertNull(info.narrowOp)
             assertNotNull(info.previewTemplate)
         }
+
+    @Test
+    fun aRelayLoginPreviewNamesTheRelayInsteadOfItsEmptyContent() =
+        runTest {
+            val auth = RelayAuthEvent.build(RelayUrlNormalizer.normalize("wss://relay.damus.io"), "chal-123")
+            val template = EventTemplate<Event>(auth.createdAt, auth.kind, auth.tags, auth.content)
+            val info = build(BunkerRequestSign(event = template), op = NostrSignerOp.SignKind(RelayAuthEvent.KIND))
+
+            assertEquals("relay.damus.io", info.contentPreview)
+            assertEquals(template, info.previewTemplate)
+        }
+
+    @Test
+    fun aRegularPostPreviewIsStillItsContent() =
+        runTest {
+            val template = EventTemplate<Event>(1L, 1, emptyArray(), "  hello world  ")
+            val info = build(BunkerRequestSign(event = template), op = NostrSignerOp.SignKind(1))
+
+            assertEquals("hello world", info.contentPreview)
+        }
 }

commonsUI/src/commonMain/composeResources/values/strings.xml

@@ -1134,6 +1134,10 @@
     <string name="relay_auth_session_section">Just for now</string>
     <string name="relay_auth_session_row_desc">Logged in until you restart Amethyst</string>
     <string name="relay_auth_forget_session">Forget this login</string>
+    <string name="relay_auth_event_title">Relay login</string>
+    <string name="relay_auth_event_explainer">Proves to the relay that you control this account. Nothing is posted.</string>
+    <string name="relay_auth_event_no_relay">No relay named in this login</string>
+    <string name="relay_auth_event_challenge">Challenge: %1$s</string>
     <string name="relay_auth_session_forgotten_undo">%1$s will ask again the next time it needs you.</string>
     <string name="relay_auth_session_undo_blocked">Not restored. “Never log in” is on, so Amethyst won't log in to %1$s.</string>
     <string name="relay_auth_blocked_section">Blocked by your block list</string>
@@ -4505,6 +4509,7 @@
     <string name="napplet_op_decrypt">read your private messages</string>
     <string name="napplet_op_decrypt_from">read your private messages with %1$s</string>
     <string name="napplet_op_encrypt">encrypt a message</string>
+    <string name="napplet_op_relay_login">log in to relays as you</string>
     <string name="napplet_op_sign_kind_named">sign for %1$s (kind: %2$d)</string>
     <string name="napplet_permissions_title">Connected Apps</string>
     <string name="napplets">nApplets</string>

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/note/NoteCompose.kt

@@ -221,6 +221,7 @@ import com.vitorpamplona.amethyst.commons.ui.note.types.RenderPublicationIndex
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderPublicationSection
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderReaction
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayAddMember
+import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayAuth
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayDiscovery
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayGroupMessage
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayJoinRequest
@@ -372,6 +373,7 @@ import com.vitorpamplona.quartz.nip35Torrents.TorrentCommentEvent
 import com.vitorpamplona.quartz.nip35Torrents.TorrentEvent
 import com.vitorpamplona.quartz.nip37Drafts.DraftWrapEvent
 import com.vitorpamplona.quartz.nip40Expiration.expiration
+import com.vitorpamplona.quartz.nip42RelayAuth.RelayAuthEvent
 import com.vitorpamplona.quartz.nip43RelayMembers.addMember.RelayAddMemberEvent
 import com.vitorpamplona.quartz.nip43RelayMembers.joinRequest.RelayJoinRequestEvent
 import com.vitorpamplona.quartz.nip43RelayMembers.leaveRequest.RelayLeaveRequestEvent
@@ -1307,6 +1309,10 @@ private fun RenderNoteRow(
             RenderRelayLeaveRequest(baseNote, accountViewModel, nav)
         }
 
+        is RelayAuthEvent -> {
+            RenderRelayAuth(baseNote, accountViewModel, nav)
+        }
+
         is PinListEvent -> {
             RenderPinListEvent(baseNote, backgroundColor, accountViewModel, nav)
         }

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/note/types/RelayAuth.kt

@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.commons.ui.note.types
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import com.vitorpamplona.amethyst.commons.icons.symbols.Icon
+import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
+import com.vitorpamplona.amethyst.commons.model.Note
+import com.vitorpamplona.amethyst.commons.resources.Res
+import com.vitorpamplona.amethyst.commons.resources.relay_auth_event_challenge
+import com.vitorpamplona.amethyst.commons.resources.relay_auth_event_explainer
+import com.vitorpamplona.amethyst.commons.resources.relay_auth_event_no_relay
+import com.vitorpamplona.amethyst.commons.resources.relay_auth_event_title
+import com.vitorpamplona.amethyst.commons.ui.navigation.navs.INav
+import com.vitorpamplona.amethyst.commons.ui.note.RenderRelay
+import com.vitorpamplona.amethyst.commons.ui.note.RenderRelayIcon
+import com.vitorpamplona.amethyst.commons.ui.stringRes
+import com.vitorpamplona.amethyst.commons.ui.theme.ThemeComparisonColumn
+import com.vitorpamplona.amethyst.commons.viewmodels.AccountViewModel
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.displayUrl
+import com.vitorpamplona.quartz.nip42RelayAuth.RelayAuthEvent
+
+/**
+ * NIP-42 kind 22242: a login to a relay. It is not a post — its content is empty and nobody but
+ * the relay ever sees it — so it renders as "log in to <relay>" instead of falling through to the
+ * text-note layout. Mostly met in signer consent prompts, where an app asks to sign one.
+ */
+@Composable
+fun RenderRelayAuth(
+    baseNote: Note,
+    accountViewModel: AccountViewModel,
+    nav: INav,
+) {
+    val noteEvent = baseNote.event as? RelayAuthEvent ?: return
+    val relays = remember(noteEvent) { noteEvent.relays() }
+    val challenge = remember(noteEvent) { noteEvent.challenge() }
+
+    RelayAuthCard(relays, challenge) { relay ->
+        RenderRelay(relay, accountViewModel, nav)
+    }
+}
+
+@Composable
+fun RelayAuthCard(
+    relays: List<NormalizedRelayUrl>,
+    challenge: String?,
+    relayIcon: @Composable (NormalizedRelayUrl) -> Unit,
+) {
+    Column(
+        modifier =
+            Modifier
+                .fillMaxWidth()
+                .padding(8.dp),
+        verticalArrangement = Arrangement.spacedBy(6.dp),
+    ) {
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            Icon(
+                symbol = MaterialSymbols.Key,
+                contentDescription = null,
+                modifier = Modifier.size(24.dp),
+                tint = MaterialTheme.colorScheme.primary,
+            )
+            Column {
+                Text(
+                    text = stringRes(Res.string.relay_auth_event_title),
+                    fontWeight = FontWeight.Bold,
+                    style = MaterialTheme.typography.bodyLarge,
+                )
+                Text(
+                    text = stringRes(Res.string.relay_auth_event_explainer),
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+        }
+
+        if (relays.isEmpty()) {
+            Text(
+                text = stringRes(Res.string.relay_auth_event_no_relay),
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.error,
+                modifier = Modifier.padding(start = 32.dp),
+            )
+        }
+
+        relays.forEach { relay ->
+            Row(
+                modifier = Modifier.padding(start = 32.dp),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
+                relayIcon(relay)
+                Text(
+                    text = relay.displayUrl(),
+                    fontWeight = FontWeight.Bold,
+                    style = MaterialTheme.typography.bodyMedium,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+            }
+        }
+
+        challenge?.let {
+            Text(
+                text = stringRes(Res.string.relay_auth_event_challenge, it),
+                style = MaterialTheme.typography.labelSmall.copy(fontFamily = FontFamily.Monospace),
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+                modifier = Modifier.padding(start = 32.dp),
+            )
+        }
+    }
+}
+
+@Preview
+@Composable
+private fun RelayAuthCardPreview() {
+    ThemeComparisonColumn {
+        RelayAuthCard(
+            relays = listOf(NormalizedRelayUrl("wss://relay.damus.io/")),
+            challenge = "4f2c9a1e-7b3d-4c8e-a6f0-2d9b1e3c5a7f",
+        ) { relay ->
+            RenderRelayIcon(
+                displayUrl = relay.url,
+                iconUrl = null,
+                loadProfilePicture = false,
+                loadRobohash = true,
+                pingInMs = 0,
+            )
+        }
+    }
+}

commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/ui/screen/loggedIn/threadview/ThreadFeedView.kt

@@ -223,6 +223,7 @@ import com.vitorpamplona.amethyst.commons.ui.note.types.RenderPublicMessage
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderPublicationSection
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderReaction
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayAddMember
+import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayAuth
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayDiscovery
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayJoinRequest
 import com.vitorpamplona.amethyst.commons.ui.note.types.RenderRelayLeaveRequest
@@ -341,6 +342,7 @@ import com.vitorpamplona.quartz.nip34Git.status.GitStatusEvent
 import com.vitorpamplona.quartz.nip35Torrents.TorrentCommentEvent
 import com.vitorpamplona.quartz.nip35Torrents.TorrentEvent
 import com.vitorpamplona.quartz.nip37Drafts.DraftWrapEvent
+import com.vitorpamplona.quartz.nip42RelayAuth.RelayAuthEvent
 import com.vitorpamplona.quartz.nip43RelayMembers.addMember.RelayAddMemberEvent
 import com.vitorpamplona.quartz.nip43RelayMembers.joinRequest.RelayJoinRequestEvent
 import com.vitorpamplona.quartz.nip43RelayMembers.leaveRequest.RelayLeaveRequestEvent
@@ -1119,6 +1121,8 @@ private fun FullBleedNoteCompose(
                     RenderRelayJoinRequest(baseNote, accountViewModel, nav)
                 } else if (noteEvent is RelayLeaveRequestEvent) {
                     RenderRelayLeaveRequest(baseNote, accountViewModel, nav)
+                } else if (noteEvent is RelayAuthEvent) {
+                    RenderRelayAuth(baseNote, accountViewModel, nav)
                 } else if (noteEvent is TextNoteModificationEvent) {
                     RenderTextModificationEvent(
                         note = baseNote,

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip42RelayAuth/RelayAuthEvent.kt

@@ -42,7 +42,9 @@ class RelayAuthEvent(
 ) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
     fun relay() = tags.firstNotNullOfOrNull(RelayTag::parse)
 
-    fun challenge() = tags.firstNotNullOfOrNull(ChallengeTag::parse)
+    fun relays() = tags.authRelays()
+
+    fun challenge() = tags.authChallenge()
 
     companion object {
         const val KIND = 22242

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip42RelayAuth/TagArrayExt.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip42RelayAuth
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArray
+import com.vitorpamplona.quartz.nip01Core.core.fastFirstNotNullOfOrNull
+import com.vitorpamplona.quartz.nip42RelayAuth.tags.ChallengeTag
+import com.vitorpamplona.quartz.nip42RelayAuth.tags.RelayTag
+
+/** Every relay a NIP-42 auth event (or its unsigned template) logs into. Usually just one. */
+fun TagArray.authRelays() = mapNotNull(RelayTag::parse)
+
+fun TagArray.authChallenge() = fastFirstNotNullOfOrNull(ChallengeTag::parse)