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Sovran follows a well-organized architecture that separates concerns and makes the codebase easy to navigate. This guide explains each directory and its purpose.

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Root Directory Structure

sovran/
├── app/                    # Expo Router file-based routing
├── assets/                 # Static assets (images, fonts)
├── components/             # React components
├── config/                 # App configuration
├── constants/              # App-wide constants
├── helper/                 # Stateless utility functions
├── hocs/                   # Higher-order components
├── hooks/                  # Reusable React hooks
├── providers/              # React context providers
├── redux/                  # Redux store (legacy, migrating to Zustand)
├── stores/                 # Zustand state management
├── utils/                  # Utility functions
├── .cursor/                # AI agent rules and documentation
├── .maestro/               # UI test flows
├── scripts/                # Build and automation scripts
├── patches/                # Package patches via patch-package
└── targets/                # Native app targets (widgets)

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Core Directories

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app/ - Routes & Navigation

Expo Router uses file-based routing. Each file in app/ automatically becomes a route. 
app/
├── _layout.tsx                    # Root layout with providers
├── (drawer)/                      # Drawer navigation group
│   ├── _layout.tsx                # Drawer layout
│   └── (tabs)/                    # Tab navigation group
│       ├── _layout.tsx            # Tab bar layout
│       ├── index/                 # Wallet tab
│       ├── payments/              # Payments tab
│       └── explore/               # Explore tab
├── (send-flow)/                   # Send payment flow
├── (receive-flow)/                # Receive payment flow
├── (mint-flow)/                   # Mint management flow
│   ├── add.tsx                    # Add new mints
│   ├── list.tsx                   # Mint list
│   ├── info.tsx                   # Mint details
│   ├── reviews.tsx                # Mint reviews (KYM)
│   └── rebalancePlan.tsx          # Rebalance planning
├── (map-flow)/                    # BTCMap integration
│   ├── index.tsx                  # Map view
│   └── detail.tsx                 # Merchant details
├── (user-flow)/                   # User profile flow
│   ├── profile.tsx                # User profile view
│   └── share.tsx                  # Share profile
├── (filter-flow)/                 # Transaction filters
├── (transactions-flow)/           # Transaction details
├── message/                       # Nostr DM system
│   └── components/                # Message UI components
├── settings-pages/                # Settings screens
│   ├── theme.tsx                  # Theme selection
│   ├── passcode.tsx               # Passcode setup
│   ├── keyring.tsx                # P2PK key management
│   ├── routing.tsx                # Swap routing config
│   └── recovery.tsx               # Wallet recovery
├── claimUsername.tsx              # Lightning address claim
└── pendingEcash.tsx               # Pending ecash management
Screens should be thin: The app/ directory focuses on route orchestration. Business logic belongs in hooks, helpers, or stores.

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components/ - UI Components

Components are organized by abstraction level: 
components/
├── ui/                            # Primitive components
│   ├── hero-transition/           # Hero transition animations
│   └── icon-symbol.tsx            # SF Symbols wrapper
├── blocks/                        # Composed product UI
│   ├── AccountPagerView.tsx       # Account swiper
│   ├── PrimaryBalance.tsx         # Balance display
│   ├── Transactions.tsx           # Transaction list
│   ├── Transaction/               # Transaction components
│   │   ├── HistoryEntryTimeline.tsx
│   │   ├── HistoryEntryHeader.tsx
│   │   └── HistoryEntryRefresh.tsx
│   ├── payments/                  # Payments tab components
│   │   ├── DraggableContactsList.tsx
│   │   └── ContactItem.tsx
│   ├── contacts/                  # Contact search
│   │   └── SearchResult.tsx
│   ├── health/                    # Wallet health
│   │   ├── WalletHealthCard.tsx
│   │   └── WalletHealthModalContent.tsx
│   ├── rebalance/                 # Mint rebalancing
│   │   ├── RebalanceStepRow.tsx
│   │   ├── rebalancePlanner.ts
│   │   └── routing.ts
│   ├── distribution/              # Balance distribution
│   │   ├── DistributionSlider.tsx
│   │   └── MintDistributionItem.tsx
│   ├── routstr/                   # AI chat integration
│   │   └── SessionsPanel.tsx
│   ├── passcode/                  # Passcode UI
│   │   ├── PasscodeScreen.tsx
│   │   ├── NumericKeyboard.tsx
│   │   └── PasscodeGate.tsx
│   └── sheets/                    # Bottom sheets
│       └── emoji-picker/          # Emoji token encoding
├── screens/                       # Full screen components
│   ├── SendTokenScreen.tsx        # Send screen
│   ├── ReceiveScreen.tsx          # Receive screen
│   ├── CameraScreen.tsx           # QR scanner
│   ├── UserMessagesScreen.tsx     # DM conversation
│   └── TransactionsFilterContext.tsx
├── layouts/                       # Layout components
├── navigation/                    # Navigation components
└── overlays/                      # Overlay components

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hooks/ - React Hooks

Reusable hooks and Cashu-specific logic: 
hooks/
├── coco/                          # Cashu (Coco) hooks
│   ├── useProcessPaymentString.ts # Process QR/NFC/paste/deeplink
│   ├── useMintManagement.ts       # Load/add/remove/restore mints
│   ├── useNostrDiscoveredMints.ts # Discover mints via Nostr
│   ├── useSovranDiscoveredMints.ts# Discover mints via Sovran API
│   ├── useAuditedMint.ts          # Single mint audit info
│   ├── useAuditedMints.ts         # Batch mint audits
│   ├── useKYMMint.ts              # Single mint KYM rating
│   └── useKYMMints.ts             # Batch KYM ratings
├── useSecureStore.ts              # Secure storage access
├── useMnemonic.ts                 # Mnemonic seed management
├── useCashuMnemonic.ts            # Cashu wallet seed
├── useNostrProfile.ts             # Fetch Nostr profile data
├── useNostrDirectMessage.ts       # NIP-17 DMs with NIP-44 encryption
├── useNostrEngagement.ts          # Social engagement metrics
├── useTransactionLocation.ts      # GPS location stamping
├── useTransactionLocationSection.ts# Location reveal/hide state
├── useNfcEcashPayment.tsx         # NFC payment handling
├── useHandleCameraPermission.ts   # Camera permission flow
├── useReservedProofs.ts           # Reserved ecash proofs
├── useAppPendingAmount.ts         # Calculate pending balances
├── useVersionCheck.ts             # App version checking
└── useDeeplink.ts                 # cashu:// and sovran:// URLs
Cashu Integration: The hooks/coco/ directory contains all Cashu protocol integration logic. Always compose coco hooks rather than reimplementing them.

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helper/ - Utility Functions

Stateless utility functions organized by domain: 
helper/
├── coco/                          # Cashu integration utilities
├── nfc/                           # NFC payment utilities
│   └── nfc.ts                     # NDEF Type 4 Tag protocol
├── popup/                         # Popup/toast utilities
├── routstr/                       # Routstr AI API
│   └── api.ts                     # API client
├── third-party/                   # Third-party integrations
├── secureStorage.ts               # Secure storage helper
└── nip17.ts                       # NIP-17 gift wrap utilities

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stores/ - State Management

Zustand stores for global state (migrating from Redux): 
stores/
├── settingsStore.ts               # App settings
├── profileStore.ts                # User profile (profile-scoped)
├── mintStore.ts                   # Mint management
├── mintDistributionStore.ts       # Distribution targets (basis points)
├── pricelistStore.ts              # BTC price cache (USD/EUR/GBP)
├── scanHistoryStore.ts            # Scan history (QR/NFC/paste/deeplink)
├── searchHistoryStore.ts          # Search history
├── transactionLocationStore.ts    # GPS location stamps
├── swapTransactionsStore.ts       # Swap transaction grouping
├── btcMapStore.ts                 # BTC Map merchant cache (24h TTL)
├── auditMintStore.ts              # Audit data cache
├── kymMintStore.ts                # KYM rating cache
├── nostrSocialStore.ts            # Nostr social graph data
├── npcMintStore.ts                # NPC mint data
├── routstrStore.ts                # Routstr AI state
├── popupStore.ts                  # Popup/toast queue
└── migrateSettings.ts             # Redux → Zustand migration
Zustand Store Scoping: Some stores are profile-scoped, meaning they’re isolated per user profile. See .cursor/rules/zustand-store-scoping.mdc for details.

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providers/ - Context Providers

React context providers for app-wide state: 
providers/
├── ThemeProvider.tsx              # Theme context
├── NostrKeysProvider.tsx          # BIP39 → Nostr keys (NIP-06)
├── NostrNDKProvider.tsx           # NDK instance
├── PricelistProvider.tsx          # BTC price updates
├── InitializationProvider.tsx     # App initialization
├── BackgroundProvider.tsx         # Background image themes
└── OfflineProvider.tsx            # Network status

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utils/ - Utility Modules

Higher-level utilities: 
utils/
├── nip17.ts                       # NIP-17/NIP-59 gift wrap (rumor → seal → wrap)
├── mapClustering.ts               # Supercluster-based clustering
├── btcMapClusterCache.ts          # LRU cluster cache (max 3)
└── locationPrivacy.ts             # Location privacy utilities

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Architecture Principles

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Separation of Concerns

  1. Routes (app/) - Orchestration only, minimal logic
  2. Components (components/) - Pure presentation, receive data via props
  3. Hooks (hooks/) - Reusable stateful logic
  4. Helpers (helper/) - Pure functions, no side effects
  5. Stores (stores/) - Global state management
  6. Providers (providers/) - Context and initialization

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Cashu Integration

Source of Truth: coco-cashu-core is the source of truth for Cashu types and logic.
  • Never redefine coco types
  • Compose coco hooks, don’t reimplement them
  • Import from coco, not @cashu/cashu-ts
The integration is layered:
  • coco-cashu-core - Core Cashu protocol logic
  • coco-cashu-expo-sqlite - SQLite storage adapter
  • coco-cashu-react - React hooks
  • coco-cashu-plugin-npc - NPC plugin
  • hooks/coco/ - App-specific Cashu hook composition
  • helper/coco/ - App-specific Cashu utilities

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State Management Evolution

The app is migrating from Redux to Zustand:
  • Redux (redux/) - Legacy, being phased out
  • Zustand (stores/) - Current state management solution
  • Migration - stores/migrateSettings.ts handles data migration

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Special Directories

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.cursor/rules/ - Agent Documentation

Self-improving documentation for AI agents: 
.cursor/rules/
├── rules-index-authoring-guide.mdc
├── popup-toast-sheet-guidelines.mdc
├── secure-storage-key-derivation.mdc
├── text-typography-skeleton-guidelines.mdc
├── theme-system-architecture.mdc
├── zustand-store-scoping.mdc
└── git-github-workflow.mdc
These docs are updated whenever gaps, stale info, or missing patterns are discovered.

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scripts/ - Automation

scripts/
├── build-background-themes.js     # Generate background themes
├── resize-screenshots.js          # Resize app screenshots
├── sync-screenshots.mjs           # Sync screenshots to CDN
├── sync-altstore.mjs              # AltStore metadata sync
├── create-freedomstore-pr.sh      # FreedomStore PR automation
└── generate-test-vectors.ts       # Test vector generation
The app uses nested navigators: 
Root (_layout.tsx)
└── Drawer ((drawer)/_layout.tsx)
    └── Tabs ((drawer)/(tabs)/_layout.tsx)
        ├── Wallet Tab (index/)
        ├── Payments Tab (payments/)
        └── Explore Tab (explore/)
Modal flows use route groups:
  • (send-flow)/ - Send payment modals
  • (receive-flow)/ - Receive payment modals
  • (mint-flow)/ - Mint management modals
  • (map-flow)/ - Map view modals
  • (user-flow)/ - User profile modals

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Next Steps

Tech Stack

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Scripts Reference

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