# Domain-Driven Design Analysis: Smesh Nostr Client

## Executive Summary

This document provides a Domain-Driven Design (DDD) analysis of the Smesh codebase, a React/TypeScript Nostr client. The analysis covers the current domain layer implementation, evaluates progress against DDD principles, and provides recommendations for continued evolution.

**Current Status (January 2026):**
- Domain layer established with explicit bounded contexts
- Core value objects implemented (Pubkey, RelayUrl, EventId, Timestamp)
- Rich aggregates created (FollowList, MuteList, PinnedUsersList, RelaySet, RelayList, FavoriteRelays, BookmarkList, PinList)
- Domain events defined for social context
- Application services layer started (PublishingService, RelaySelector)
- Migration adapters enable incremental adoption
- **All key providers refactored to use domain aggregates:**
  - FollowListProvider → FollowList aggregate
  - MuteListProvider → MuteList aggregate
  - PinnedUsersProvider → PinnedUsersList aggregate
  - FavoriteRelaysProvider → FavoriteRelays, RelaySet, RelayUrl
  - BookmarksProvider → BookmarkList aggregate
  - PinListProvider → PinList aggregate

**Remaining Work:**
- Integrate repositories into providers (replace direct service calls)
- Create Feed bounded context with proper domain model

---

## 1. Domain Layer Architecture

### 1.1 Directory Structure

```
src/
├── domain/                     # Core domain logic
│   ├── index.ts               # Domain layer exports
│   ├── shared/                # Shared Kernel
│   │   ├── value-objects/
│   │   │   ├── Pubkey.ts      ✓ Implemented
│   │   │   ├── RelayUrl.ts    ✓ Implemented
│   │   │   ├── EventId.ts     ✓ Implemented
│   │   │   └── Timestamp.ts   ✓ Implemented
│   │   ├── errors.ts          ✓ Domain errors
│   │   └── adapters.ts        ✓ Migration helpers
│   ├── identity/              # Identity Bounded Context
│   │   ├── Account.ts         ✓ Entity
│   │   ├── SignerType.ts      ✓ Value Object
│   │   ├── errors.ts          ✓ Domain errors
│   │   └── adapters.ts        ✓ Migration helpers
│   ├── social/                # Social Graph Bounded Context
│   │   ├── FollowList.ts      ✓ Aggregate
│   │   ├── MuteList.ts        ✓ Aggregate
│   │   ├── PinnedUsersList.ts ✓ Aggregate
│   │   ├── events.ts          ✓ Domain Events
│   │   ├── repositories.ts    ✓ Repository interfaces
│   │   ├── errors.ts          ✓ Domain errors
│   │   └── adapters.ts        ✓ Migration helpers
│   ├── relay/                 # Relay Bounded Context
│   │   ├── RelaySet.ts        ✓ Aggregate
│   │   ├── RelayList.ts       ✓ Aggregate
│   │   ├── FavoriteRelays.ts  ✓ Aggregate
│   │   ├── repositories.ts    ✓ Repository interfaces
│   │   ├── errors.ts          ✓ Domain errors
│   │   └── adapters.ts        ✓ Migration helpers
│   └── content/               # Content Bounded Context
│       ├── Note.ts            ✓ Entity
│       ├── Reaction.ts        ✓ Value Object
│       ├── Repost.ts          ✓ Value Object
│       ├── BookmarkList.ts    ✓ Aggregate
│       ├── PinList.ts         ✓ Aggregate
│       ├── errors.ts          ✓ Domain errors
│       └── adapters.ts        ✓ Migration helpers
│
├── application/               # Application Services
│   ├── PublishingService.ts   ✓ Domain Service
│   └── RelaySelector.ts       ✓ Domain Service
│
├── infrastructure/            # Infrastructure Layer
│   └── persistence/           # Repository implementations
│       ├── FollowListRepositoryImpl.ts       ✓
│       ├── MuteListRepositoryImpl.ts         ✓
│       ├── PinnedUsersListRepositoryImpl.ts  ✓
│       ├── RelayListRepositoryImpl.ts        ✓
│       ├── RelaySetRepositoryImpl.ts         ✓
│       ├── FavoriteRelaysRepositoryImpl.ts   ✓
│       ├── BookmarkListRepositoryImpl.ts     ✓
│       └── PinListRepositoryImpl.ts          ✓
│
├── providers/                 # React Context (presentation layer)
├── services/                  # Infrastructure services
├── components/                # UI components
└── lib/                       # Legacy utilities (being migrated)
```

### 1.2 Bounded Contexts

```
┌─────────────────────────────────────────────────────────────────────┐
│                         CONTEXT MAP                                  │
├─────────────────────────────────────────────────────────────────────┤
│                                                                      │
│    ┌───────────────┐                      ┌─────────────────┐       │
│    │   Identity    │     Partnership      │  Social Graph   │       │
│    │   Context     │◄───────────────────►│    Context      │       │
│    │               │                      │                 │       │
│    │ • Account     │                      │ • FollowList    │       │
│    │ • SignerType  │                      │ • MuteList      │       │
│    │               │                      │ • PinnedUsersList│      │
│    └───────┬───────┘                      └───────┬─────────┘       │
│            │                                      │                  │
│            │ Customer/Supplier                    │ Partnership     │
│            ▼                                      ▼                  │
│    ┌───────────────┐                      ┌───────────────┐         │
│    │    Content    │                      │     Feed      │         │
│    │    Context    │                      │    Context    │         │
│    │               │                      │               │         │
│    │ • Note        │                      │ (Providers)   │         │
│    │ • Reaction    │                      │               │         │
│    │ • Repost      │                      │               │         │
│    │ • BookmarkList│                      │               │         │
│    │ • PinList     │                      │               │         │
│    └───────────────┘                      └───────┬───────┘         │
│            │                                      │                  │
│            └──────────────┬───────────────────────┘                 │
│                           ▼                                          │
│                   ┌───────────────┐                                 │
│                   │     Relay     │                                 │
│                   │    Context    │                                 │
│                   │               │                                 │
│                   │ • RelayUrl    │                                 │
│                   │ • RelaySet    │                                 │
│                   │ • RelayList   │                                 │
│                   └───────────────┘                                 │
│                                                                      │
│    ┌───────────────────────────────────────────────────────────┐   │
│    │                    SHARED KERNEL                           │   │
│    │  Pubkey | EventId | Timestamp | RelayUrl | DomainError    │   │
│    └───────────────────────────────────────────────────────────┘   │
│                                                                      │
└─────────────────────────────────────────────────────────────────────┘
```

---

## 2. Implementation Details

### 2.1 Value Objects (Shared Kernel)

All value objects follow DDD principles: immutable, self-validating, equality by value.

| Value Object | Status | Key Features |
|--------------|--------|--------------|
| `Pubkey` | ✓ Complete | Hex/npub/nprofile parsing, validation, formatting |
| `RelayUrl` | ✓ Complete | URL normalization, WebSocket validation, secure/onion detection |
| `EventId` | ✓ Complete | Hex/nevent parsing, validation |
| `Timestamp` | ✓ Complete | Unix timestamp wrapper, date conversion |

**Example: Pubkey Value Object**

```typescript
// Self-validating factory methods
const pubkey = Pubkey.fromHex('abc123...')        // throws InvalidPubkeyError
const pubkey = Pubkey.fromNpub('npub1...')        // throws InvalidPubkeyError
const pubkey = Pubkey.tryFromString('...')        // returns null on invalid

// Immutable with rich behavior
pubkey.hex          // "abc123..."
pubkey.npub         // "npub1..."
pubkey.formatted    // "abc123...xyz4"
pubkey.formatNpub(12)  // "npub1abc...xyz"

// Equality by value
pubkey1.equals(pubkey2)  // true if same hex
```

### 2.2 Aggregates

#### FollowList Aggregate (Social Context)

```typescript
class FollowList {
  // Factory methods
  static empty(owner: Pubkey): FollowList
  static fromEvent(event: Event): FollowList

  // Invariants enforced
  follow(pubkey): FollowListChange   // throws CannotFollowSelfError
  unfollow(pubkey): FollowListChange

  // Rich behavior
  isFollowing(pubkey): boolean
  getFollowing(): Pubkey[]
  getEntries(): FollowEntry[]
  setPetname(pubkey, name): boolean
  merge(other: FollowList): void

  // Persistence support
  toTags(): string[][]
  toDraftEvent(): DraftEvent
}
```

#### MuteList Aggregate (Social Context)

```typescript
class MuteList {
  // Factory methods
  static empty(owner: Pubkey): MuteList
  static fromEvent(event: Event, decryptedPrivateTags: string[][]): MuteList

  // Invariants enforced
  mutePublicly(pubkey): MuteListChange   // throws CannotMuteSelfError
  mutePrivately(pubkey): MuteListChange
  unmute(pubkey): MuteListChange

  // Rich behavior
  isMuted(pubkey): boolean
  getMuteVisibility(pubkey): MuteVisibility | null
  switchToPrivate(pubkey): MuteListChange
  switchToPublic(pubkey): MuteListChange

  // Persistence support
  toPublicTags(): string[][]
  toPrivateTags(): string[][]  // For NIP-04 encryption
  toDraftEvent(encryptedContent): DraftEvent
}
```

#### PinnedUsersList Aggregate (Social Context)

```typescript
class PinnedUsersList {
  // Factory methods
  static empty(owner: Pubkey): PinnedUsersList
  static fromEvent(event: Event): PinnedUsersList

  // Invariants enforced
  pin(pubkey): PinnedUsersListChange    // throws Error if pinning self
  unpin(pubkey): PinnedUsersListChange

  // Rich behavior
  isPinned(pubkey): boolean
  getPinnedPubkeys(): Pubkey[]
  getEntries(): PinnedUserEntry[]
  getPublicEntries(): PinnedUserEntry[]
  getPrivateEntries(): PinnedUserEntry[]

  // Private pins support (NIP-04 encrypted)
  setPrivatePins(privateTags: string[][]): void
  setEncryptedContent(content: string): void

  // Persistence support
  toTags(): string[][]           // Public pins
  toPrivateTags(): string[][]    // For NIP-04 encryption
  toDraftEvent(): DraftEvent
}
```

#### RelaySet Aggregate (Relay Context)

```typescript
class RelaySet {
  // Factory methods
  static create(name: string, id?: string): RelaySet
  static createWithRelays(name: string, relayUrls: string[], id?: string): RelaySet
  static fromEvent(event: Event): RelaySet

  // Invariants enforced (valid URLs, no duplicates)
  addRelay(relay: RelayUrl): RelaySetChange
  removeRelay(relay: RelayUrl): RelaySetChange

  // Rich behavior
  rename(newName: string): void
  hasRelay(relay: RelayUrl): boolean
  getRelays(): RelayUrl[]

  // Persistence support
  toTags(): string[][]
  toDraftEvent(): DraftEvent
}
```

#### BookmarkList Aggregate (Content Context)

```typescript
class BookmarkList {
  // Factory methods
  static empty(owner: Pubkey): BookmarkList
  static fromEvent(event: Event): BookmarkList
  static tryFromEvent(event: Event | null): BookmarkList | null

  // Rich behavior
  addFromEvent(event: Event): BookmarkListChange
  addEvent(eventId: EventId, pubkey?: Pubkey): BookmarkListChange
  addReplaceable(coordinate: string): BookmarkListChange
  remove(idOrCoordinate: string): BookmarkListChange
  removeFromEvent(event: Event): BookmarkListChange

  // Query methods
  isBookmarked(idOrCoordinate: string): boolean
  hasEventId(eventId: string): boolean
  hasCoordinate(coordinate: string): boolean
  getEntries(): BookmarkEntry[]
  getEventIds(): string[]
  getReplaceableCoordinates(): string[]

  // Persistence support
  toTags(): string[][]
  toDraftEvent(): DraftEvent
}
```

#### PinList Aggregate (Content Context)

```typescript
class PinList {
  // Factory methods
  static empty(owner: Pubkey): PinList
  static fromEvent(event: Event): PinList
  static tryFromEvent(event: Event | null): PinList | null

  // Invariants enforced
  pin(event: Event): PinListChange    // throws CannotPinOthersContentError, CanOnlyPinNotesError
  unpin(eventId: string): PinListChange
  unpinEvent(event: Event): PinListChange

  // Query methods
  isPinned(eventId: string): boolean
  getEntries(): PinEntry[]
  getEventIds(): string[]
  getEventIdSet(): Set<string>
  get isFull(): boolean  // max 5 pins

  // Persistence support
  toTags(): string[][]
  toDraftEvent(): DraftEvent
}
```

### 2.3 Entities

#### Note Entity (Content Context)

```typescript
class Note {
  // Factory method
  static fromEvent(event: Event): Note
  static tryFromEvent(event: Event | null): Note | null

  // Identity
  get id(): EventId
  get author(): Pubkey

  // Rich behavior
  get noteType(): 'root' | 'reply' | 'quote'
  get isRoot(): boolean
  get isReply(): boolean
  get mentions(): NoteMention[]
  get references(): NoteReference[]
  get hashtags(): string[]
  get hasContentWarning(): boolean
  get contentWarning(): string | undefined

  // Query methods
  mentionsUser(pubkey: Pubkey): boolean
  referencesNote(eventId: EventId): boolean
  hasHashtag(hashtag: string): boolean
}
```

#### Account Entity (Identity Context)

```typescript
class Account {
  // Factory methods
  static create(pubkey: Pubkey, signerType: SignerType, credentials?: AccountCredentials): Account
  static fromRaw(pubkeyHex: string, signerTypeValue: string, credentials?: AccountCredentials): Account
  static fromLegacy(legacy: TAccount): Account | null

  // Identity and behavior
  get id(): string  // pubkey:signerType
  get pubkey(): Pubkey
  get signerType(): SignerType
  get canSign(): boolean
  get isViewOnly(): boolean
  equals(other: Account): boolean
  hasSamePubkey(other: Account): boolean

  // Persistence support
  toLegacy(): TAccount
  toPointer(): { pubkey: string; signerType: string }
}
```

### 2.4 Domain Events

```typescript
// Base event
abstract class DomainEvent {
  readonly occurredAt: Timestamp
  abstract get eventType(): string
}

// Social context events
class UserFollowed extends DomainEvent {
  eventType = 'social.user_followed'
  constructor(actor: Pubkey, followed: Pubkey, relayHint?: string, petname?: string)
}

class UserUnfollowed extends DomainEvent {
  eventType = 'social.user_unfollowed'
  constructor(actor: Pubkey, unfollowed: Pubkey)
}

class UserMuted extends DomainEvent {
  eventType = 'social.user_muted'
  constructor(actor: Pubkey, muted: Pubkey, visibility: MuteVisibility)
}

class UserUnmuted extends DomainEvent {
  eventType = 'social.user_unmuted'
  constructor(actor: Pubkey, unmuted: Pubkey)
}

class MuteVisibilityChanged extends DomainEvent {
  eventType = 'social.mute_visibility_changed'
  constructor(actor: Pubkey, target: Pubkey, from: MuteVisibility, to: MuteVisibility)
}

class FollowListPublished extends DomainEvent
class MuteListPublished extends DomainEvent
```

### 2.5 Application Services

```typescript
// PublishingService - creates draft events
class PublishingService {
  createNoteDraft(content: string, options: PublishNoteOptions): DraftEvent
  createReactionDraft(targetEventId: string, targetPubkey: string, targetKind: number, emoji: string): DraftEvent
  createRepostDraft(targetEventId: string, targetPubkey: string, embeddedContent?: string): DraftEvent
  createFollowListDraft(followList: FollowList): DraftEvent
  createMuteListDraft(muteList: MuteList, encryptedPrivateMutes: string): DraftEvent
  createRelayListDraft(relayList: RelayList): DraftEvent
  extractMentionsFromContent(content: string): Pubkey[]
  extractHashtagsFromContent(content: string): string[]
}

// RelaySelector - determines relays for publishing
class RelaySelector {
  selectWriteRelays(userRelayList: RelayList): RelayUrl[]
  selectReadRelays(userRelayList: RelayList): RelayUrl[]
  selectForUser(pubkey: Pubkey, userRelayList: RelayList): RelayUrl[]
  mergeRelays(sources: RelayUrl[][]): RelayUrl[]
}
```

### 2.6 Migration Adapters

Each bounded context provides adapters for incremental migration from legacy code:

```typescript
// Pubkey adapters
toPubkey(hex: string): Pubkey           // Create from hex
tryToPubkey(hex: string): Pubkey | null // Safe creation
fromPubkey(pubkey: Pubkey): string      // Extract hex
toPubkeys(hexArray: string[]): Pubkey[] // Bulk conversion
fromPubkeys(pubkeys: Pubkey[]): string[] // Bulk extraction
createPubkeySet(hexArray: string[]): Set<string> // For fast lookups

// FollowList adapters
toFollowList(owner: string, hexArray: string[]): FollowList
fromFollowListToHexSet(followList: FollowList): Set<string>
isFollowingHex(followList: FollowList, hex: string): boolean
followByHex(followList: FollowList, hex: string): FollowListChange

// MuteList adapters
toMuteList(owner: string, publicHexes: string[], privateHexes: string[]): MuteList
fromMuteListToHexSet(muteList: MuteList): Set<string>
isMutedHex(muteList: MuteList, hex: string): boolean
createMuteFilter(muteList: MuteList): (hex: string) => boolean

// PinnedUsersList adapters
toPinnedUsersList(event: Event, decryptedPrivateTags?: string[][]): PinnedUsersList
fromPinnedUsersListToHexSet(list: PinnedUsersList): Set<string>
isPinnedHex(list: PinnedUsersList, hex: string): boolean
pinByHex(list: PinnedUsersList, hex: string): boolean
unpinByHex(list: PinnedUsersList, hex: string): boolean
createPinnedFilter(list: PinnedUsersList): (hex: string) => boolean
```

---

## 3. Anti-Pattern Status

| Anti-Pattern | Original Status | Current Status | Progress |
|--------------|-----------------|----------------|----------|
| **Anemic Domain Model** | High severity | Mostly resolved | Aggregates have behavior; key providers now delegate to domain |
| **Smart UI** | Medium severity | Partially resolved | Domain logic moving to aggregates; some UI components still have logic |
| **Database-Driven Design** | Low severity | Resolved | Domain model independent of storage |
| **Missing Aggregate Boundaries** | Medium severity | Resolved | Clear aggregates with invariants |
| **Leaky Abstractions** | Medium severity | Mostly resolved | Domain layer has no infrastructure deps; providers act as thin orchestration layer |

---

## 4. Remaining Work

### 4.1 Phase 3: Provider Integration (Complete)

All key providers have been refactored to use domain aggregates:

**Completed:**
- ✓ `FollowListProvider` → uses `FollowList` aggregate
- ✓ `MuteListProvider` → uses `MuteList` aggregate
- ✓ `PinnedUsersProvider` → uses `PinnedUsersList` aggregate
- ✓ `FavoriteRelaysProvider` → uses `FavoriteRelays`, `RelaySet`, `RelayUrl`
- ✓ `BookmarksProvider` → uses `BookmarkList` aggregate
- ✓ `PinListProvider` → uses `PinList` aggregate

**Example: Refactored Pattern**

```typescript
// Before: Logic in provider
const addBookmark = async (event: Event) => {
  const currentTags = bookmarkListEvent?.tags || []
  if (currentTags.some(tag => tag[0] === 'e' && tag[1] === event.id)) return
  const newTags = [...currentTags, buildETag(event.id, event.pubkey)]
  // manual tag construction...
}

// After: Delegate to domain
const addBookmark = async (event: Event) => {
  const bookmarkList = tryToBookmarkList(bookmarkListEvent) ?? BookmarkList.empty(owner)
  const change = bookmarkList.addFromEvent(event)
  if (change.type === 'no_change') return
  const draftEvent = bookmarkList.toDraftEvent()
  await publish(draftEvent)
}
```

### 4.2 Phase 4: Repository Implementation (Complete)

Repository implementations created in `src/infrastructure/persistence/`:

**Implemented Repositories:**
- ✓ `FollowListRepositoryImpl` - Social context
- ✓ `MuteListRepositoryImpl` - Social context (with NIP-04 encryption support)
- ✓ `PinnedUsersListRepositoryImpl` - Social context (with NIP-04 encryption support)
- ✓ `RelayListRepositoryImpl` - Relay context
- ✓ `RelaySetRepositoryImpl` - Relay context
- ✓ `FavoriteRelaysRepositoryImpl` - Relay context
- ✓ `BookmarkListRepositoryImpl` - Content context
- ✓ `PinListRepositoryImpl` - Content context

**Dependency Injection:**
- `RepositoryProvider` - Provides repository instances to React components via context
- Located in `src/providers/RepositoryProvider.tsx`
- Nested after `NostrProvider` in `App.tsx` to access publish and encryption functions

**Usage Pattern:**
```typescript
// Create repository with dependencies
const followListRepo = new FollowListRepositoryImpl({ publish })

// Find aggregate
const followList = await followListRepo.findByOwner(pubkey)

// Save aggregate (publishes to relays and updates cache)
await followListRepo.save(followList)
```

### 4.3 Phase 5: Event-Driven Architecture (Complete)

Domain event infrastructure implemented in `src/domain/shared/events.ts`:

**Event Dispatcher:**
- `SimpleEventDispatcher` - In-memory event bus with type-safe handlers
- `eventDispatcher` - Global singleton instance
- Supports type-specific handlers and catch-all handlers

**Event Handlers (`src/application/handlers/`):**
- `SocialEventHandlers.ts` - Handles user follow/unfollow, mute/unmute events
- `ContentEventHandlers.ts` - Handles bookmark, pin, reaction events

**Event Types:**
- Social: `UserFollowed`, `UserUnfollowed`, `UserMuted`, `UserUnmuted`, `MuteVisibilityChanged`, `FollowListPublished`, `MuteListPublished`
- Content: `EventBookmarked`, `EventUnbookmarked`, `NotePinned`, `NoteUnpinned`, `PinsLimitExceeded`, `ReactionAdded`, `ContentReposted`

**Usage Pattern:**
```typescript
// Dispatch events from providers
await eventDispatcher.dispatch(
  new EventBookmarked(ownerPubkey, eventId, 'event')
)

// Register handlers
eventDispatcher.on('content.event_bookmarked', async (event) => {
  console.log('Bookmarked:', event.bookmarkedEventId)
})
```

---

## 5. Metrics

| Metric | December 2024 | January 2026 | Target |
|--------|---------------|--------------|--------|
| Value Objects | 0 | 4 types | 4+ ✓ |
| Explicit Aggregates | 0 | 8 aggregates | 5+ ✓ |
| Domain Events | 0 | 7 event types | 10+ |
| Domain Entities | 0 | 3 entities | 5 |
| Repository Interfaces | 0 | 8 interfaces | 5+ ✓ |
| Repository Implementations | 0 | 8 implementations | 5+ ✓ |
| Application Services | 0 | 2 services | 4 |
| Providers Using Domain | 0 | 6 providers | 5+ ✓ |
| Domain Logic in Providers | ~60% | ~10% | <10% ✓ |

---

## 6. Implementation Checklist

- [x] Ubiquitous language documented (Nostr terminology)
- [x] Bounded contexts identified (Identity, Social, Content, Relay, Feed)
- [x] Context map documented with relationships
- [x] Value objects for primitives (Pubkey, RelayUrl, EventId, Timestamp)
- [x] Aggregates with clear invariants (FollowList, MuteList, PinnedUsersList, RelaySet, RelayList, FavoriteRelays, BookmarkList, PinList)
- [x] Entities with behavior (Account, Note, Reaction, Repost)
- [x] Domain events for state changes (Social context events)
- [x] Domain errors hierarchy (InvalidPubkeyError, CannotFollowSelfError, CannotPinOthersContentError, etc.)
- [x] Migration adapters for incremental adoption
- [x] Key providers refactored to use domain aggregates (FollowListProvider, MuteListProvider, PinnedUsersProvider, FavoriteRelaysProvider, BookmarksProvider, PinListProvider)
- [x] Repositories abstract persistence (7 interfaces with IndexedDB + Relay implementations)
- [x] Event handlers for cross-context communication (SocialEventHandlers, ContentEventHandlers)
- [x] Migration from legacy lib/ utilities (completed - all pubkey logic now uses domain Pubkey directly)

---

## 7. Recommendations

### Short-term (Next Sprint)
1. **Migrate providers to use repositories directly** - Replace direct publish calls with repository.save() calls
2. **Refactor NostrProvider** - Consider moving event state management to individual providers using repositories

### Medium-term (Next Quarter)
1. **Create Feed bounded context** with proper domain model
2. **Expand domain event handlers** for more cross-context coordination
3. **Add remaining domain events** (NoteCreated, ProfileUpdated, etc.)

### Long-term
1. **Event sourcing consideration** - Nostr events are naturally event-sourced
2. **CQRS pattern** for read-heavy feed operations

---

## 8. Conclusion

The Smesh codebase has made significant progress toward DDD principles:

1. **Established domain layer** with clear bounded contexts
2. **Implemented core value objects** enabling type-safe domain operations
3. **Created rich aggregates** with encapsulated business rules (8 aggregates)
4. **Defined domain events** for social graph and content operations
5. **Provided migration path** via adapter functions
6. **Refactored all key providers** to use domain aggregates (6 providers now delegate to domain)
7. **Implemented repository pattern** with 8 repository interfaces and 8 implementations for persistence abstraction
8. **Added event-driven architecture** with domain event dispatcher and cross-context handlers
9. **Completed lib/ utilities migration** - all pubkey logic now uses domain Pubkey directly
10. **Created RepositoryProvider** for dependency injection of repositories into React components

The anemic domain model anti-pattern has been resolved. Providers now act as thin orchestration layers that delegate business logic to domain aggregates. Domain events are dispatched when aggregates change, enabling cross-context communication.

**Social context aggregates:**
- `FollowList` - Following relationships with petnames and relay hints
- `MuteList` - Public and private mutes with NIP-04 encryption
- `PinnedUsersList` - Pinned users with public/private support (kind 10003)

**Repository infrastructure:**
- All 8 repository implementations complete with IndexedDB caching and relay publishing
- `RepositoryProvider` provides dependency-injected repository instances
- Repositories handle NIP-04 encryption/decryption for private data

**lib/ utilities migration completed:**
- `lib/pubkey.ts` - Deprecated functions removed; only `generateImageByPubkey` (UI utility) remains
- `lib/tag.ts` - Uses `Pubkey.isValidHex()` directly from domain
- `lib/nip05.ts` - Uses domain `Pubkey` class directly
- `lib/event-metadata.ts` - Uses domain `Pubkey` class directly
- `lib/relay.ts`, `lib/event.ts` - Infrastructure utilities (appropriate to keep)
- All services, providers, components, and hooks now import directly from `@/domain`

The next priorities are:
- Migrating providers to use repositories directly for persistence
- Creating Feed bounded context with proper domain model

---

*Updated: January 2026*
*Analysis based on DDD principles from Eric Evans and Vaughn Vernon*
