Add verification sheets and UI affordances

app/src/main/java/com/bitchat/android/ui/ChatHeader.kt

@@ -318,6 +318,10 @@ private fun PrivateChatHeader(
 ) {
     val colorScheme = MaterialTheme.colorScheme
     val isNostrDM = peerID.startsWith("nostr_") || peerID.startsWith("nostr:")
+    val verifiedFingerprints by viewModel.verifiedFingerprints.collectAsStateWithLifecycle()
+    val isVerified = remember(peerID, verifiedFingerprints) {
+        viewModel.isPeerVerified(peerID, verifiedFingerprints)
+    }
     // Determine mutual favorite state for this peer (supports mesh ephemeral 16-hex via favorites lookup)
     val isMutualFavorite = remember(peerID, peerNicknames) {
         try {
@@ -413,17 +417,33 @@ private fun PrivateChatHeader(
 
             // Show a globe when chatting via Nostr alias, or when mesh session not established but mutual favorite exists
             val showGlobe = isNostrDM || (sessionState != "established" && isMutualFavorite)
+            val securityModifier = if (!isNostrDM) {
+                Modifier.clickable { viewModel.showSecurityVerificationSheet() }
+            } else {
+                Modifier
+            }
+
             if (showGlobe) {
                 Icon(
                     imageVector = Icons.Outlined.Public,
                 contentDescription = stringResource(R.string.cd_nostr_reachable),
-                    modifier = Modifier.size(14.dp),
+                    modifier = Modifier.size(14.dp).then(securityModifier),
                     tint = Color(0xFF9B59B6) // Purple like iOS
                 )
             } else {
                 NoiseSessionIcon(
                     sessionState = sessionState,
-                    modifier = Modifier.size(14.dp)
+                    modifier = Modifier.size(14.dp).then(securityModifier)
+                )
+            }
+
+            if (isVerified) {
+                Spacer(modifier = Modifier.width(4.dp))
+                Icon(
+                    imageVector = Icons.Filled.Verified,
+                    contentDescription = stringResource(R.string.verify_title),
+                    modifier = Modifier.size(14.dp).then(securityModifier),
+                    tint = Color(0xFF32D74B)
                 )
             }
 

app/src/main/java/com/bitchat/android/ui/ChatScreen.kt

@@ -57,6 +57,8 @@ fun ChatScreen(viewModel: ChatViewModel) {
     val showMentionSuggestions by viewModel.showMentionSuggestions.collectAsStateWithLifecycle()
     val mentionSuggestions by viewModel.mentionSuggestions.collectAsStateWithLifecycle()
     val showAppInfo by viewModel.showAppInfo.collectAsStateWithLifecycle()
+    val showVerificationSheet by viewModel.showVerificationSheet.collectAsStateWithLifecycle()
+    val showSecurityVerificationSheet by viewModel.showSecurityVerificationSheet.collectAsStateWithLifecycle()
 
     var messageText by remember { mutableStateOf(TextFieldValue("")) }
     var showPasswordPrompt by remember { mutableStateOf(false) }
@@ -327,6 +329,10 @@ fun ChatScreen(viewModel: ChatViewModel) {
             SidebarOverlay(
                 viewModel = viewModel,
                 onDismiss = { viewModel.hideSidebar() },
+                onShowVerification = {
+                    viewModel.showVerificationSheet(fromSidebar = true)
+                    viewModel.hideSidebar()
+                },
                 modifier = Modifier.fillMaxSize()
             )
         }
@@ -373,7 +379,11 @@ fun ChatScreen(viewModel: ChatViewModel) {
         },
         selectedUserForSheet = selectedUserForSheet,
         selectedMessageForSheet = selectedMessageForSheet,
-        viewModel = viewModel
+        viewModel = viewModel,
+        showVerificationSheet = showVerificationSheet,
+        onVerificationSheetDismiss = viewModel::hideVerificationSheet,
+        showSecurityVerificationSheet = showSecurityVerificationSheet,
+        onSecurityVerificationSheetDismiss = viewModel::hideSecurityVerificationSheet
     )
 }
 
@@ -513,7 +523,11 @@ private fun ChatDialogs(
     onUserSheetDismiss: () -> Unit,
     selectedUserForSheet: String,
     selectedMessageForSheet: BitchatMessage?,
-    viewModel: ChatViewModel
+    viewModel: ChatViewModel,
+    showVerificationSheet: Boolean,
+    onVerificationSheetDismiss: () -> Unit,
+    showSecurityVerificationSheet: Boolean,
+    onSecurityVerificationSheetDismiss: () -> Unit
 ) {
     // Password dialog
     PasswordPromptDialog(
@@ -567,4 +581,20 @@ private fun ChatDialogs(
             viewModel = viewModel
         )
     }
+
+    if (showVerificationSheet) {
+        VerificationSheet(
+            isPresented = showVerificationSheet,
+            onDismiss = onVerificationSheetDismiss,
+            viewModel = viewModel
+        )
+    }
+
+    if (showSecurityVerificationSheet) {
+        SecurityVerificationSheet(
+            isPresented = showSecurityVerificationSheet,
+            onDismiss = onSecurityVerificationSheetDismiss,
+            viewModel = viewModel
+        )
+    }
 }

app/src/main/java/com/bitchat/android/ui/SecurityVerificationSheet.kt

@@ -0,0 +1,443 @@
+package com.bitchat.android.ui
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.statusBarsPadding
+import androidx.compose.foundation.layout.width
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Lock
+import androidx.compose.material.icons.filled.Verified
+import androidx.compose.material.icons.filled.Warning
+import androidx.compose.material.icons.outlined.NoEncryption
+import androidx.compose.material.icons.outlined.Sync
+import androidx.compose.material.icons.outlined.Warning as OutlinedWarning
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.Text
+import androidx.compose.material3.rememberModalBottomSheetState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.bitchat.android.R
+
+private data class SecurityStatusInfo(
+    val text: String,
+    val icon: ImageVector,
+    val tint: Color
+)
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SecurityVerificationSheet(
+    isPresented: Boolean,
+    onDismiss: () -> Unit,
+    viewModel: ChatViewModel,
+    modifier: Modifier = Modifier
+) {
+    if (!isPresented) return
+
+    val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
+    val peerID by viewModel.selectedPrivateChatPeer.collectAsStateWithLifecycle()
+    val verifiedFingerprints by viewModel.verifiedFingerprints.collectAsStateWithLifecycle()
+    val peerSessionStates by viewModel.peerSessionStates.collectAsStateWithLifecycle()
+
+    val isDark = isSystemInDarkTheme()
+    val accent = if (isDark) Color.Green else Color(0xFF008000)
+    val boxColor = if (isDark) Color.White.copy(alpha = 0.06f) else Color.Black.copy(alpha = 0.06f)
+    val peerHexRegex = remember { Regex("^[0-9a-fA-F]{16}$") }
+
+    ModalBottomSheet(
+        modifier = modifier.statusBarsPadding(),
+        onDismissRequest = onDismiss,
+        sheetState = sheetState,
+        containerColor = MaterialTheme.colorScheme.background,
+        dragHandle = null
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(horizontal = 16.dp, vertical = 12.dp),
+            verticalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            SecurityVerificationHeader(
+                accent = accent,
+                onClose = onDismiss
+            )
+
+            if (peerID == null) {
+                Text(
+                    text = stringResource(R.string.fingerprint_no_peer),
+                    style = MaterialTheme.typography.bodyMedium.copy(fontFamily = FontFamily.Monospace),
+                    color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f)
+                )
+            } else {
+                val selectedPeerID = peerID!!
+                val displayName = viewModel.resolvePeerDisplayNameForFingerprint(selectedPeerID)
+                val fingerprint = viewModel.getPeerFingerprintForDisplay(selectedPeerID)
+                val isVerified = fingerprint != null && verifiedFingerprints.contains(fingerprint)
+                val sessionState = peerSessionStates[selectedPeerID]
+                val statusInfo = buildStatusInfo(
+                    isVerified = isVerified,
+                    sessionState = sessionState,
+                    accent = accent
+                )
+
+                SecurityStatusCard(
+                    displayName = displayName,
+                    accent = accent,
+                    boxColor = boxColor,
+                    statusInfo = statusInfo
+                )
+
+                FingerprintBlock(
+                    title = stringResource(R.string.fingerprint_their),
+                    fingerprint = fingerprint,
+                    boxColor = boxColor,
+                    accent = accent
+                )
+
+                FingerprintBlock(
+                    title = stringResource(R.string.fingerprint_yours),
+                    fingerprint = viewModel.getMyFingerprint(),
+                    boxColor = boxColor,
+                    accent = accent
+                )
+
+                SecurityVerificationActions(
+                    isVerified = isVerified,
+                    fingerprint = fingerprint,
+                    displayName = displayName,
+                    accent = accent,
+                    canStartHandshake = fingerprint == null && selectedPeerID.matches(peerHexRegex),
+                    onStartHandshake = { viewModel.meshService.initiateNoiseHandshake(selectedPeerID) },
+                    onVerify = { fp -> viewModel.verifyFingerprintValue(fp) },
+                    onUnverify = { fp -> viewModel.unverifyFingerprintValue(fp) }
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun SecurityVerificationHeader(
+    accent: Color,
+    onClose: () -> Unit
+) {
+    Row(
+        modifier = Modifier.fillMaxWidth(),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Text(
+            text = stringResource(R.string.security_verification_title),
+            style = MaterialTheme.typography.titleSmall.copy(
+                fontFamily = FontFamily.Monospace,
+                fontWeight = FontWeight.Bold
+            ),
+            color = accent
+        )
+        Spacer(modifier = Modifier.weight(1f))
+        CloseButton(onClick = onClose)
+    }
+}
+
+@Composable
+private fun buildStatusInfo(
+    isVerified: Boolean,
+    sessionState: String?,
+    accent: Color
+): SecurityStatusInfo {
+    val text = when {
+        isVerified -> stringResource(R.string.fingerprint_status_verified)
+        sessionState == "established" -> stringResource(R.string.fingerprint_status_encrypted)
+        sessionState == "handshaking" -> stringResource(R.string.fingerprint_status_handshaking)
+        sessionState == "failed" -> stringResource(R.string.fingerprint_status_failed)
+        else -> stringResource(R.string.fingerprint_status_uninitialized)
+    }
+    val icon = when {
+        isVerified -> Icons.Filled.Verified
+        sessionState == "handshaking" -> Icons.Outlined.Sync
+        sessionState == "failed" -> Icons.Outlined.OutlinedWarning
+        sessionState == "established" -> Icons.Filled.Lock
+        else -> Icons.Outlined.NoEncryption
+    }
+    val tint = when {
+        isVerified -> Color(0xFF32D74B)
+        sessionState == "failed" -> Color(0xFFFF3B30)
+        sessionState == "handshaking" -> Color(0xFFFF9500)
+        sessionState == "established" -> Color(0xFF32D74B)
+        else -> accent.copy(alpha = 0.6f)
+    }
+    return SecurityStatusInfo(text, icon, tint)
+}
+
+@Composable
+private fun SecurityStatusCard(
+    displayName: String,
+    accent: Color,
+    boxColor: Color,
+    statusInfo: SecurityStatusInfo
+) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(boxColor, shape = MaterialTheme.shapes.medium)
+            .padding(16.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Icon(
+            imageVector = statusInfo.icon,
+            contentDescription = null,
+            tint = statusInfo.tint
+        )
+        Spacer(modifier = Modifier.width(12.dp))
+        Column {
+            Text(
+                text = displayName,
+                style = MaterialTheme.typography.titleMedium.copy(
+                    fontFamily = FontFamily.Monospace,
+                    fontWeight = FontWeight.Bold
+                ),
+                color = accent
+            )
+            Text(
+                text = statusInfo.text,
+                style = MaterialTheme.typography.bodySmall.copy(
+                    fontFamily = FontFamily.Monospace
+                ),
+                color = accent.copy(alpha = 0.8f)
+            )
+        }
+    }
+}
+
+@Composable
+private fun SecurityVerificationActions(
+    isVerified: Boolean,
+    fingerprint: String?,
+    displayName: String,
+    accent: Color,
+    canStartHandshake: Boolean,
+    onStartHandshake: () -> Unit,
+    onVerify: (String) -> Unit,
+    onUnverify: (String) -> Unit
+) {
+    if (canStartHandshake) {
+        Button(
+            onClick = onStartHandshake,
+            colors = ButtonDefaults.buttonColors(
+                containerColor = accent,
+                contentColor = Color.White
+            ),
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Text(
+                text = stringResource(R.string.fingerprint_start_handshake),
+                fontFamily = FontFamily.Monospace,
+                fontSize = 12.sp
+            )
+        }
+    }
+
+    if (isVerified) {
+        VerificationStatusRow(
+            icon = Icons.Filled.Verified,
+            iconTint = Color(0xFF32D74B),
+            text = stringResource(R.string.fingerprint_verified_label),
+            textTint = Color(0xFF32D74B)
+        )
+        Text(
+            text = stringResource(R.string.fingerprint_verified_message),
+            style = MaterialTheme.typography.bodySmall.copy(
+                fontFamily = FontFamily.Monospace
+            ),
+            color = accent.copy(alpha = 0.7f),
+            modifier = Modifier.fillMaxWidth(),
+            textAlign = TextAlign.Center
+        )
+        Button(
+            onClick = { fingerprint?.let(onUnverify) },
+            colors = ButtonDefaults.buttonColors(
+                containerColor = Color(0xFFFF3B30),
+                contentColor = Color.White
+            ),
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Text(
+                text = stringResource(R.string.verify_remove),
+                fontFamily = FontFamily.Monospace,
+                fontSize = 12.sp
+            )
+        }
+    } else {
+        VerificationStatusRow(
+            icon = Icons.Filled.Warning,
+            iconTint = Color(0xFFFF9500),
+            text = stringResource(R.string.fingerprint_not_verified_label),
+            textTint = Color(0xFFFF9500)
+        )
+        Text(
+            text = stringResource(R.string.fingerprint_not_verified_message_fmt, displayName),
+            style = MaterialTheme.typography.bodySmall.copy(
+                fontFamily = FontFamily.Monospace
+            ),
+            color = accent.copy(alpha = 0.7f),
+            modifier = Modifier.fillMaxWidth(),
+            textAlign = TextAlign.Center
+        )
+        if (fingerprint != null) {
+            Button(
+                onClick = { onVerify(fingerprint) },
+                colors = ButtonDefaults.buttonColors(
+                    containerColor = Color(0xFF34C759),
+                    contentColor = Color.White
+                ),
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                Text(
+                    text = stringResource(R.string.fingerprint_mark_verified),
+                    fontFamily = FontFamily.Monospace,
+                    fontSize = 12.sp
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun VerificationStatusRow(
+    icon: ImageVector,
+    iconTint: Color,
+    text: String,
+    textTint: Color
+) {
+    Row(
+        modifier = Modifier.fillMaxWidth(),
+        horizontalArrangement = Arrangement.Center,
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Icon(
+            imageVector = icon,
+            contentDescription = null,
+            tint = iconTint
+        )
+        Spacer(modifier = Modifier.width(6.dp))
+        Text(
+            text = text,
+            style = MaterialTheme.typography.bodyMedium.copy(
+                fontFamily = FontFamily.Monospace,
+                fontWeight = FontWeight.Bold
+            ),
+            color = textTint
+        )
+    }
+}
+
+@Composable
+private fun FingerprintBlock(
+    title: String,
+    fingerprint: String?,
+    boxColor: Color,
+    accent: Color
+) {
+    val clipboardManager = LocalClipboardManager.current
+    var showMenu by remember(fingerprint) { mutableStateOf(false) }
+    val interactionSource = remember { MutableInteractionSource() }
+
+    Column(
+        modifier = Modifier.fillMaxWidth(),
+        verticalArrangement = Arrangement.spacedBy(8.dp)
+    ) {
+        Text(
+            text = title,
+            style = MaterialTheme.typography.labelSmall.copy(
+                fontFamily = FontFamily.Monospace,
+                fontWeight = FontWeight.Bold
+            ),
+            color = accent.copy(alpha = 0.8f)
+        )
+        if (fingerprint != null) {
+            Column {
+                Text(
+                    text = formatFingerprint(fingerprint),
+                    style = MaterialTheme.typography.bodyMedium.copy(
+                        fontFamily = FontFamily.Monospace,
+                        fontSize = 14.sp
+                    ),
+                    color = accent,
+                    textAlign = TextAlign.Center,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .combinedClickable(
+                            interactionSource = interactionSource,
+                            indication = null,
+                            onClick = {},
+                            onLongClick = { showMenu = true }
+                        )
+                        .background(boxColor, shape = MaterialTheme.shapes.small)
+                        .padding(16.dp),
+                )
+                DropdownMenu(
+                    expanded = showMenu,
+                    onDismissRequest = { showMenu = false }
+                ) {
+                    DropdownMenuItem(
+                        text = { Text(text = stringResource(R.string.fingerprint_copy)) },
+                        onClick = {
+                            clipboardManager.setText(AnnotatedString(fingerprint))
+                            showMenu = false
+                        }
+                    )
+                }
+            }
+        } else {
+            Text(
+                text = stringResource(R.string.fingerprint_pending),
+                style = MaterialTheme.typography.bodyMedium.copy(fontFamily = FontFamily.Monospace),
+                color = Color(0xFFFF9500),
+                modifier = Modifier.padding(16.dp)
+            )
+        }
+    }
+}
+
+private fun formatFingerprint(fingerprint: String): String {
+    val upper = fingerprint.uppercase()
+    val sb = StringBuilder()
+    upper.forEachIndexed { index, c ->
+        if (index > 0 && index % 4 == 0) {
+            if (index % 16 == 0) sb.append('\n') else sb.append(' ')
+        }
+        sb.append(c)
+    }
+    return sb.toString()
+}

app/src/main/java/com/bitchat/android/ui/VerificationSheet.kt

@@ -0,0 +1,426 @@
+package com.bitchat.android.ui
+
+import android.graphics.Bitmap
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.statusBarsPadding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.selection.SelectionContainer
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.QrCode
+import androidx.compose.material.icons.outlined.QrCodeScanner
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.Text
+import androidx.compose.material3.rememberModalBottomSheetState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.core.graphics.createBitmap
+import androidx.core.graphics.set
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.bitchat.android.R
+import com.bitchat.android.services.VerificationService
+import com.google.accompanist.permissions.ExperimentalPermissionsApi
+import com.google.accompanist.permissions.isGranted
+import com.google.accompanist.permissions.rememberPermissionState
+import com.google.zxing.BarcodeFormat
+import com.google.zxing.common.BitMatrix
+import com.google.zxing.qrcode.QRCodeWriter
+import com.journeyapps.barcodescanner.BarcodeCallback
+import com.journeyapps.barcodescanner.BarcodeResult
+import com.journeyapps.barcodescanner.DecoratedBarcodeView
+import com.journeyapps.barcodescanner.DefaultDecoderFactory
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun VerificationSheet(
+    isPresented: Boolean,
+    onDismiss: () -> Unit,
+    viewModel: ChatViewModel,
+    modifier: Modifier = Modifier
+) {
+    if (!isPresented) return
+
+    val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
+    val isDark = isSystemInDarkTheme()
+    val accent = if (isDark) Color.Green else Color(0xFF008000)
+    val boxColor = if (isDark) Color.White.copy(alpha = 0.06f) else Color.Black.copy(alpha = 0.06f)
+
+    var showingScanner by remember { mutableStateOf(false) }
+    val nickname by viewModel.nickname.collectAsStateWithLifecycle()
+    val npub = remember {
+        viewModel.getCurrentNpub()
+    }
+
+
+    val qrString = remember(nickname, npub) {
+        viewModel.buildMyQRString(nickname, npub)
+    }
+
+    ModalBottomSheet(
+        modifier = modifier.statusBarsPadding(),
+        onDismissRequest = onDismiss,
+        sheetState = sheetState,
+        containerColor = MaterialTheme.colorScheme.background,
+        dragHandle = null
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(horizontal = 16.dp, vertical = 12.dp),
+            verticalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            VerificationHeader(
+                accent = accent,
+                onClose = onDismiss
+            )
+
+            Box(
+                modifier = Modifier
+                    .weight(1f)
+                    .fillMaxWidth()
+            ) {
+                Column(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .verticalScroll(rememberScrollState()),
+                    verticalArrangement = Arrangement.spacedBy(12.dp)
+                ) {
+                    if (showingScanner) {
+                        VerificationScanner(
+                            accent = accent,
+                            onScan = { code ->
+                                val qr = VerificationService.verifyScannedQR(code)
+                                if (qr != null && viewModel.beginQRVerification(qr)) {
+                                    showingScanner = false
+                                }
+                            }
+                        )
+                    } else {
+                        MyQrPanel(
+                            qrString = qrString,
+                            accent = accent,
+                            boxColor = boxColor,
+                        )
+                    }
+                }
+            }
+
+            Column(
+                modifier = Modifier.fillMaxWidth(),
+                verticalArrangement = Arrangement.spacedBy(10.dp)
+            ) {
+                ToggleVerificationModeButton(
+                    showingScanner = showingScanner,
+                    onToggle = { showingScanner = !showingScanner }
+                )
+
+                val peerID by viewModel.selectedPrivateChatPeer.collectAsStateWithLifecycle()
+                val fingerprints by viewModel.verifiedFingerprints.collectAsStateWithLifecycle()
+                if (peerID != null) {
+                    val fingerprint = viewModel.meshService.getPeerFingerprint(peerID!!)
+                    if (fingerprint != null && fingerprints.contains(fingerprint)) {
+                        Button(
+                            onClick = { viewModel.unverifyFingerprint(peerID!!) },
+                            colors = ButtonDefaults.buttonColors(
+                                containerColor = MaterialTheme.colorScheme.secondary.copy(alpha = 0.12f),
+                                contentColor = MaterialTheme.colorScheme.onSurface
+                            ),
+                            modifier = Modifier.fillMaxWidth()
+                        ) {
+                            Text(
+                                text = stringResource(R.string.verify_remove),
+                                fontFamily = FontFamily.Monospace,
+                                fontSize = 12.sp
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun VerificationHeader(
+    accent: Color,
+    onClose: () -> Unit
+) {
+    Row(
+        modifier = Modifier.fillMaxWidth(),
+        horizontalArrangement = Arrangement.SpaceBetween,
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Text(
+            text = stringResource(R.string.verify_title).uppercase(),
+            fontSize = 14.sp,
+            fontFamily = FontFamily.Monospace,
+            color = accent
+        )
+        CloseButton(onClick = onClose)
+    }
+}
+
+@Composable
+private fun MyQrPanel(
+    qrString: String,
+    accent: Color,
+    boxColor: Color,
+) {
+    Text(
+        text = stringResource(R.string.verify_my_qr_title),
+        fontSize = 16.sp,
+        fontFamily = FontFamily.Monospace,
+        color = accent,
+        modifier = Modifier.fillMaxWidth(),
+        textAlign = TextAlign.Center
+    )
+
+    QRCodeCard(qrString = qrString, boxColor = boxColor)
+}
+
+@Composable
+private fun VerificationScanner(
+    accent: Color,
+    onScan: (String) -> Unit
+) {
+    Text(
+        text = stringResource(R.string.verify_scan_prompt_friend),
+        fontSize = 16.sp,
+        fontFamily = FontFamily.Monospace,
+        color = accent,
+        modifier = Modifier.fillMaxWidth(),
+        textAlign = TextAlign.Center
+    )
+    QRScannerPanel(onCode = onScan)
+}
+
+@Composable
+private fun ToggleVerificationModeButton(
+    showingScanner: Boolean,
+    onToggle: () -> Unit
+) {
+    Button(
+        onClick = onToggle,
+        colors = ButtonDefaults.buttonColors(
+            containerColor = MaterialTheme.colorScheme.secondary.copy(alpha = 0.12f),
+            contentColor = MaterialTheme.colorScheme.onSurface
+        ),
+        modifier = Modifier.fillMaxWidth()
+    ) {
+        if (showingScanner) {
+            Icon(
+                imageVector = Icons.Outlined.QrCode,
+                contentDescription = null,
+                modifier = Modifier.size(16.dp)
+            )
+            Spacer(modifier = Modifier.size(8.dp))
+            Text(
+                text = stringResource(R.string.verify_show_my_qr),
+                fontFamily = FontFamily.Monospace,
+                fontSize = 13.sp
+            )
+        } else {
+            Icon(
+                imageVector = Icons.Outlined.QrCodeScanner,
+                contentDescription = null,
+                modifier = Modifier.size(16.dp)
+            )
+            Spacer(modifier = Modifier.size(8.dp))
+            Text(
+                text = stringResource(R.string.verify_scan_someone),
+                fontFamily = FontFamily.Monospace,
+                fontSize = 13.sp
+            )
+        }
+    }
+}
+
+@Composable
+private fun QRCodeCard(qrString: String, boxColor: Color) {
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(boxColor, RoundedCornerShape(12.dp))
+            .padding(12.dp),
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        if (qrString.isNotBlank()) {
+            QRCodeImage(data = qrString, size = 220.dp)
+        } else {
+            Box(
+                modifier = Modifier
+                    .size(220.dp)
+                    .background(Color.Transparent, RoundedCornerShape(8.dp)),
+                contentAlignment = Alignment.Center
+            ) {
+                Text(
+                    text = stringResource(R.string.verify_qr_unavailable),
+                    fontFamily = FontFamily.Monospace,
+                    fontSize = 12.sp,
+                    color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.6f)
+                )
+            }
+        }
+
+        SelectionContainer {
+            Text(
+                text = qrString,
+                fontFamily = FontFamily.Monospace,
+                fontSize = 11.sp,
+                color = MaterialTheme.colorScheme.onSurface
+            )
+        }
+    }
+}
+
+@Composable
+private fun QRCodeImage(data: String, size: Dp) {
+    val sizePx = with(LocalDensity.current) { size.toPx().toInt() }
+    val bitmap = remember(data, sizePx) { generateQrBitmap(data, sizePx) }
+    if (bitmap != null) {
+        Image(
+            bitmap = bitmap.asImageBitmap(),
+            contentDescription = null,
+            modifier = Modifier.size(size)
+        )
+    }
+}
+
+private fun generateQrBitmap(data: String, sizePx: Int): Bitmap? {
+    if (data.isBlank() || sizePx <= 0) return null
+    return try {
+        val matrix = QRCodeWriter().encode(data, BarcodeFormat.QR_CODE, sizePx, sizePx)
+        bitmapFromMatrix(matrix)
+    } catch (_: Exception) {
+        null
+    }
+}
+
+private fun bitmapFromMatrix(matrix: BitMatrix): Bitmap {
+    val width = matrix.width
+    val height = matrix.height
+    val bitmap = createBitmap(width, height)
+    for (x in 0 until width) {
+        for (y in 0 until height) {
+            bitmap[x, y] =
+                if (matrix[x, y]) android.graphics.Color.BLACK else android.graphics.Color.WHITE
+        }
+    }
+    return bitmap
+}
+
+@OptIn(ExperimentalPermissionsApi::class)
+@Composable
+private fun QRScannerPanel(
+    onCode: (String) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    val permissionState = rememberPermissionState(android.Manifest.permission.CAMERA)
+    val context = LocalContext.current
+    var lastValid by remember { mutableStateOf<String?>(null) }
+
+    val onCodeState = rememberUpdatedState(onCode)
+    val barcodeCallback = remember {
+        object : BarcodeCallback {
+            override fun barcodeResult(result: BarcodeResult?) {
+                val text = result?.text ?: return
+                if (text == lastValid) return
+                lastValid = text
+                onCodeState.value(text)
+            }
+        }
+    }
+
+    val barcodeView = remember {
+        DecoratedBarcodeView(context).apply {
+            barcodeView.decoderFactory = DefaultDecoderFactory(listOf(BarcodeFormat.QR_CODE))
+            setStatusText("")
+        }
+    }
+
+    LaunchedEffect(Unit) {
+        barcodeView.decodeContinuous(barcodeCallback)
+    }
+
+    DisposableEffect(permissionState.status.isGranted) {
+        if (permissionState.status.isGranted) {
+            barcodeView.resume()
+        } else {
+            barcodeView.pause()
+        }
+        onDispose { barcodeView.pause() }
+    }
+
+    Column(
+        modifier = modifier.fillMaxWidth(),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.spacedBy(12.dp)
+    ) {
+        if (permissionState.status.isGranted) {
+            AndroidView(
+                factory = { barcodeView },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(260.dp)
+            )
+        } else {
+            Text(
+                text = stringResource(R.string.verify_camera_permission),
+                fontFamily = FontFamily.Monospace,
+                fontSize = 12.sp,
+                color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f)
+            )
+            Button(
+                onClick = { permissionState.launchPermissionRequest() },
+                colors = ButtonDefaults.buttonColors(
+                    containerColor = MaterialTheme.colorScheme.secondary.copy(alpha = 0.12f),
+                    contentColor = MaterialTheme.colorScheme.onSurface
+                )
+            ) {
+                Text(
+                    text = stringResource(R.string.verify_request_camera),
+                    fontFamily = FontFamily.Monospace,
+                    fontSize = 12.sp
+                )
+            }
+        }
+    }
+}