feat: v4 tokenomics + count trees (YAPP token, buy/moderation UX)

app/hashtag/page.tsx

@@ -17,6 +17,7 @@ import { useAuth } from '@/contexts/auth-context'
 import { useSettingsStore } from '@/lib/store'
 import { checkBlockedForAuthors } from '@/hooks/use-block'
 import { isCashtagStorage, cashtagStorageToDisplay } from '@/lib/post-helpers'
+import { LegacyYapprLink } from '@/components/ui/legacy-yappr-link'
 
 function HashtagPageContent() {
   const router = useRouter()
@@ -163,6 +164,7 @@ function HashtagPageContent() {
                 <p className="text-gray-500 mb-4">
                   Be the first to post with {tagSymbol}{displayTag}
                 </p>
+                <LegacyYapprLink />
               </div>
             ) : (
               posts.map((post, index) => (

app/settings/page.tsx

@@ -20,6 +20,7 @@ import {
   UserPlusIcon,
   LockClosedIcon,
   CloudArrowUpIcon,
+  NoSymbolIcon,
 } from '@heroicons/react/24/outline'
 import { Sidebar } from '@/components/layout/sidebar'
 import { RightSidebar } from '@/components/layout/right-sidebar'
@@ -41,14 +42,18 @@ import { BlockListSettings } from '@/components/settings/block-list-settings'
 import { SavedAddressesSettings } from '@/components/settings/saved-addresses-settings'
 import { StorachaSettings } from '@/components/settings/storacha-settings'
 import { PinataSettings } from '@/components/settings/pinata-settings'
+import { ModerationSettings } from '@/components/settings/moderation-settings'
+import { YAPP_TOKEN_AUTHORITY_ID } from '@/lib/constants'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
 import { useDashPayContactsModal } from '@/hooks/use-dashpay-contacts-modal'
 import { useSettingsStore } from '@/lib/store'
 import { CORS_PROXY_INFO } from '@/hooks/use-link-preview'
 import { UsernameModal } from '@/components/dpns/username-modal'
 
-type SettingsSection = 'main' | 'account' | 'contacts' | 'notifications' | 'privacy' | 'privateFeed' | 'storage' | 'appearance' | 'about'
-const VALID_SECTIONS: SettingsSection[] = ['main', 'account', 'contacts', 'notifications', 'privacy', 'privateFeed', 'storage', 'appearance', 'about']
+type SettingsSection = 'main' | 'account' | 'contacts' | 'notifications' | 'privacy' | 'privateFeed' | 'storage' | 'appearance' | 'about' | 'moderation'
+const VALID_SECTIONS: SettingsSection[] = ['main', 'account', 'contacts', 'notifications', 'privacy', 'privateFeed', 'storage', 'appearance', 'about', 'moderation']
+
+const MODERATION_SECTION = { id: 'moderation', label: 'Moderation', icon: NoSymbolIcon, description: 'Freeze or slash YAPP balances (token authority only)' }
 
 const settingsSections = [
   { id: 'account', label: 'Account', icon: UserIcon, description: 'Manage your account details' },
@@ -85,6 +90,7 @@ function SettingsPage() {
   const router = useRouter()
   const searchParams = useSearchParams()
   const { user, logout } = useAuth()
+  const isAuthority = user?.identityId === YAPP_TOKEN_AUTHORITY_ID
   const { theme, setTheme } = useTheme()
   const linkPreviewsChoice = useSettingsStore((s) => s.linkPreviewsChoice)
   const setLinkPreviewsChoice = useSettingsStore((s) => s.setLinkPreviewsChoice)
@@ -206,7 +212,7 @@ function SettingsPage() {
 
   const renderMainSettings = () => (
     <div className="divide-y divide-gray-200 dark:divide-gray-800">
-      {settingsSections.map((section) => (
+      {(isAuthority ? [...settingsSections, MODERATION_SECTION] : settingsSections).map((section) => (
         <button
           key={section.id}
           onClick={() => setActiveSection(section.id as SettingsSection)}
@@ -734,14 +740,20 @@ function SettingsPage() {
         return renderAppearanceSettings()
       case 'about':
         return renderAboutSettings()
+      case 'moderation':
+        return isAuthority ? <ModerationSettings /> : renderMainSettings()
       default:
         return renderMainSettings()
     }
   }
 
   const getSectionTitle = () => {
     if (activeSection === 'main') return 'Settings'
-    const section = settingsSections.find(s => s.id === activeSection)
+    // Only surface the Moderation title to the authority (matches renderSection's
+    // gate) so a non-authority hitting ?section=moderation doesn't see a
+    // "Moderation" header over the fallback main menu.
+    const sections = isAuthority ? [...settingsSections, MODERATION_SECTION] : settingsSections
+    const section = sections.find(s => s.id === activeSection)
     return section?.label || 'Settings'
   }
 

components/compose/compose-modal.tsx

@@ -23,6 +23,7 @@ import { extractAllTags, extractMentions } from '@/lib/post-helpers'
 import { hashtagService } from '@/lib/services/hashtag-service'
 import { mentionService } from '@/lib/services/mention-service'
 import { extractErrorMessage, isTimeoutError, categorizeError } from '@/lib/error-utils'
+import { handleInsufficientYapp } from '@/hooks/use-buy-yapp-modal'
 import {
   PostingProgress,
   PostButtonContent,
@@ -902,7 +903,9 @@ export function ComposeModal() {
       }
     } catch (error) {
       logger.error('Failed to create post:', error)
-      toast.error(categorizeError(error))
+      if (!handleInsufficientYapp(error, 'You need YAPP to post. Buy some to continue.')) {
+        toast.error(categorizeError(error))
+      }
     } finally {
       setIsPosting(false)
       setPostingProgress(null)

components/feed/feed-post-list.tsx

@@ -3,6 +3,7 @@
 import { Post } from '@/lib/types';
 import ErrorBoundary from '@/components/error-boundary';
 import { LoadingState } from '@/components/ui/loading-state';
+import { LegacyYapprLink } from '@/components/ui/legacy-yappr-link';
 import { PostCard } from '@/components/post/post-card';
 
 interface FeedPostListProps {
@@ -66,6 +67,7 @@ export function FeedPostList({
             ? 'Follow some people to see their posts here!'
             : 'Be the first to share something!'
         }
+        emptyAction={<LegacyYapprLink />}
       >
         <div>
           {posts?.map((post) => (
@@ -89,6 +91,13 @@ export function FeedPostList({
               </button>
             </div>
           )}
+
+          {!hasMore && posts && posts.length > 0 && (
+            <div className="p-6 flex flex-col items-center gap-2 border-t border-gray-200 dark:border-gray-800 text-center">
+              <p className="text-sm text-gray-500">You&apos;ve reached the end.</p>
+              <LegacyYapprLink />
+            </div>
+          )}
         </div>
       </LoadingState>
     </ErrorBoundary>

components/layout/sidebar.tsx

@@ -39,6 +39,7 @@ import { useAppStore } from '@/lib/store'
 import { useNotificationStore } from '@/lib/stores/notification-store'
 import * as DropdownMenu from '@radix-ui/react-dropdown-menu'
 import { UserAvatar } from '@/components/ui/avatar-image'
+import { YappBalanceItem } from '@/components/token/yapp-balance-item'
 import { useAuth } from '@/contexts/auth-context'
 import { notificationService } from '@/lib/services'
 import { useLoginModal } from '@/hooks/use-login-modal'
@@ -320,7 +321,8 @@ export function Sidebar() {
                   </div>
                 </DropdownMenu.Item>
                 <DropdownMenu.Separator className="h-px bg-gray-200 dark:bg-gray-800 my-1" />
-                <DropdownMenu.Item 
+                <YappBalanceItem />
+                <DropdownMenu.Item
                   className="px-4 py-2 text-sm hover:bg-gray-100 dark:hover:bg-gray-900 cursor-pointer outline-none flex items-center gap-2"
                   onClick={logout}
                 >

components/post/post-card.tsx

@@ -38,6 +38,7 @@ import { EmbeddedPostCard, EmbeddedPostSkeleton } from './embedded-post-card'
 import { EmbeddedBlogPostCard, isEmbeddedBlogPostLike } from '@/components/blog/embedded-blog-post-card'
 import { ProfileHoverCard } from '@/components/profile/profile-hover-card'
 import { useTipModal } from '@/hooks/use-tip-modal'
+import { handleInsufficientYapp } from '@/hooks/use-buy-yapp-modal'
 import { useBlock } from '@/hooks/use-block'
 import { useFollow } from '@/hooks/use-follow'
 import { useHashtagValidation } from '@/hooks/use-hashtag-validation'
@@ -364,7 +365,9 @@ export function PostCard({ post, hideAvatar = false, isOwnPost: isOwnPostProp, e
       setLiked(wasLiked)
       setLikes(prevLikes)
       logger.error('Like error:', error)
-      toast.error('Failed to update like. Please try again.')
+      if (!handleInsufficientYapp(error, 'You need YAPP to like posts. Buy some to continue.')) {
+        toast.error('Failed to update like. Please try again.')
+      }
     } finally {
       setLikeLoading(false)
     }
@@ -397,7 +400,9 @@ export function PostCard({ post, hideAvatar = false, isOwnPost: isOwnPostProp, e
       setReposted(wasReposted)
       setReposts(prevReposts)
       logger.error('Repost error:', error)
-      toast.error('Failed to update repost. Please try again.')
+      if (!handleInsufficientYapp(error, 'You need YAPP to repost. Buy some to continue.')) {
+        toast.error('Failed to update repost. Please try again.')
+      }
     } finally {
       setRepostLoading(false)
     }

components/post/tip-modal.tsx

@@ -6,6 +6,7 @@ import * as Dialog from '@radix-ui/react-dialog'
 import { XMarkIcon, CurrencyDollarIcon, QrCodeIcon, WalletIcon, BookmarkIcon } from '@heroicons/react/24/outline'
 import { CheckCircleIcon, ExclamationCircleIcon } from '@heroicons/react/24/solid'
 import { motion, AnimatePresence } from 'framer-motion'
+import toast from 'react-hot-toast'
 import { Button } from '@/components/ui/button'
 import { Spinner } from '@/components/ui/spinner'
 import { useTipModal } from '@/hooks/use-tip-modal'
@@ -204,6 +205,13 @@ export function TipModal() {
       // Update global balance in auth context (persists to localStorage)
       refreshBalance().catch(err => logger.error('Failed to refresh balance:', err))
 
+      // The tip (credit transfer) succeeded, but the public "tip" reply is a
+      // YAPP-costed doc — tell the user if it couldn't be posted rather than
+      // letting it vanish silently.
+      if (result.announcementPosted === false) {
+        toast('Tip sent — but the public tip note couldn’t be posted (needs YAPP).', { icon: '⚠️', duration: 5000 })
+      }
+
       // If key was manually entered and not already saved, offer to save
       if (keySource === 'manual' && usedTransferKeyRef.current && !hasTransferKey(user.identityId)) {
         setState('save-prompt')

components/providers.tsx

@@ -11,6 +11,7 @@ import { MentionRecoveryModal } from '@/components/post/mention-recovery-modal'
 import { DeleteConfirmationModal } from '@/components/post/delete-confirmation-modal'
 import { DashPayContactsModal } from '@/components/contacts/dashpay-contacts-modal'
 import { EncryptionKeyModal } from '@/components/auth/encryption-key-modal'
+import { BuyYappModal } from '@/components/token/buy-yapp-modal'
 
 export function Providers({ children }: { children: React.ReactNode }) {
   return (
@@ -26,6 +27,7 @@ export function Providers({ children }: { children: React.ReactNode }) {
           <UsernameModalProvider />
           <KeyBackupModal />
           <TipModal />
+          <BuyYappModal />
           <HashtagRecoveryModal />
           <MentionRecoveryModal />
           <DeleteConfirmationModal />

components/settings/moderation-settings.tsx

@@ -0,0 +1,97 @@
+'use client'
+
+import { useState } from 'react'
+import toast from 'react-hot-toast'
+import { NoSymbolIcon, ArrowUturnLeftIcon, FireIcon } from '@heroicons/react/24/outline'
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
+import { Button } from '@/components/ui/button'
+import { useAuth } from '@/contexts/auth-context'
+import { tokenService } from '@/lib/services/token-service'
+
+/**
+ * Owner-only YAPP moderation: freeze (suspend), unfreeze (reinstate), and
+ * destroyFrozen (slash the staked balance). Rendered only for the token
+ * authority identity (gated in the settings page).
+ */
+export function ModerationSettings() {
+  const { user } = useAuth()
+  const [targetId, setTargetId] = useState('')
+  const [note, setNote] = useState('')
+  const [busy, setBusy] = useState<null | 'freeze' | 'unfreeze' | 'destroyFrozen'>(null)
+
+  const run = async (action: 'freeze' | 'unfreeze' | 'destroyFrozen') => {
+    if (!user) return
+    const id = targetId.trim()
+    if (!id) {
+      toast.error('Enter the identity ID to moderate')
+      return
+    }
+    if (action === 'destroyFrozen' && !window.confirm(
+      `Permanently burn ${id}'s YAPP balance? This slashes their stake and cannot be undone. The account must already be frozen.`
+    )) return
+
+    setBusy(action)
+    const fn = action === 'freeze' ? tokenService.freeze
+      : action === 'unfreeze' ? tokenService.unfreeze
+      : tokenService.destroyFrozen
+    const result = await fn.call(tokenService, user.identityId, id, note.trim() || undefined)
+    setBusy(null)
+
+    if (result.success) {
+      toast.success(
+        action === 'freeze' ? 'Identity frozen (suspended)'
+          : action === 'unfreeze' ? 'Identity unfrozen (reinstated)'
+          : 'Frozen balance destroyed (slashed)'
+      )
+    } else {
+      toast.error(result.error || 'Action failed')
+    }
+  }
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>YAPP Moderation</CardTitle>
+        <CardDescription>
+          Freeze suspends an account (blocks posting and transfers immediately). Slash permanently
+          burns a frozen account&apos;s YAPP stake. Use unfreeze to reinstate.
+        </CardDescription>
+      </CardHeader>
+      <CardContent className="space-y-4">
+        <div>
+          <label htmlFor="moderation-target-id" className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Identity ID</label>
+          <input
+            id="moderation-target-id"
+            type="text"
+            value={targetId}
+            onChange={(e) => setTargetId(e.target.value)}
+            placeholder="Base58 identity ID to moderate"
+            className="w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-700 bg-white dark:bg-neutral-800 font-mono text-sm focus:outline-none focus:ring-2 focus:ring-yappr-500"
+          />
+        </div>
+        <div>
+          <label htmlFor="moderation-note" className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">Public note (optional)</label>
+          <input
+            id="moderation-note"
+            type="text"
+            value={note}
+            onChange={(e) => setNote(e.target.value)}
+            placeholder="Reason recorded on-chain"
+            className="w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-700 bg-white dark:bg-neutral-800 text-sm focus:outline-none focus:ring-2 focus:ring-yappr-500"
+          />
+        </div>
+        <div className="flex flex-wrap gap-2">
+          <Button variant="outline" disabled={busy !== null} onClick={() => run('freeze')} className="gap-2">
+            <NoSymbolIcon className="h-4 w-4" /> {busy === 'freeze' ? 'Freezing…' : 'Freeze'}
+          </Button>
+          <Button variant="outline" disabled={busy !== null} onClick={() => run('unfreeze')} className="gap-2">
+            <ArrowUturnLeftIcon className="h-4 w-4" /> {busy === 'unfreeze' ? 'Unfreezing…' : 'Unfreeze'}
+          </Button>
+          <Button variant="destructive" disabled={busy !== null} onClick={() => run('destroyFrozen')} className="gap-2">
+            <FireIcon className="h-4 w-4" /> {busy === 'destroyFrozen' ? 'Slashing…' : 'Slash'}
+          </Button>
+        </div>
+      </CardContent>
+    </Card>
+  )
+}