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Changelog

All notable changes to Time-Seal will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[1.0.0] - 2025-12-26 🎉

🎊 First Stable Release

Status: Production Ready
Test Coverage: 139/139 tests passing
Security Audit: All 4 defense layers operational

Security Hardening

  • ✅ Eliminated all empty catch blocks (silent failure prevention)
  • ✅ Error context preservation in parseJSON (lib/http.ts)
  • ✅ Async error handling in ErrorTracker (lib/errorTracker.ts)
  • ✅ Improved error messages in copyToClipboard (lib/mobile.ts)
  • ✅ Comprehensive defense-in-depth audit completed

Defense Layers Verified

  • ✅ Layer 1: Cryptographic Defenses (AES-GCM-256, split-key, HMAC)
  • ✅ Layer 2: Time-Lock Enforcement (server-side validation, atomic ops)
  • ✅ Layer 3: Access Control (rate limiting, nonces, bot protection)
  • ✅ Layer 4: Operational Security (audit logs, rollbacks, circuit breakers)

Documentation

  • Added DEFENSE-AUDIT.md - Comprehensive security audit report

Production Readiness

  • ✅ All critical security vulnerabilities addressed
  • ✅ Zero empty catch blocks or silent failures
  • ✅ Full error context preservation
  • ✅ Comprehensive test coverage on critical paths
  • ✅ All attack scenarios verified and protected
  • ✅ GDPR compliant (no PII, 30-day auto-deletion)
  • ✅ Production operations (load testing, error tracking, backups)

Breaking Changes

  • None (fully backward compatible)

Unreleased

Added

  • UI/UX Improvements - Enhanced button consistency and mobile responsiveness
    • Uniform button styling across all pages (dashboard, success, pulse, vault)
    • Consistent border-radius (0.5rem) matching seal type buttons
    • Proper text spacing ensuring no text touches borders
    • Subtle hover effects (5% green tint) for better visual feedback
    • Mobile-responsive button sizing and padding
    • Footer social share links (X/Twitter, Reddit, LinkedIn)
    • Extracted reusable CSS classes for button groups
    • Global button safety rules for consistent spacing

Changed

  • All buttons now use transparent background with subtle hover effects
  • Button text color standardized to 50% opacity (full opacity on hover)
  • Social share section in success page matches footer design
  • Improved mobile padding and font sizes for better touch targets

Added

  • Ephemeral Seals UI - Complete user interface for self-destructing seals
    • Third seal type button (TIMED | DEADMAN | EPHEMERAL)
    • Max views input field (1-100 views)
    • "One-Time Password" template for ephemeral seals
    • Responsive 3-column layout for seal type selection
    • Dashboard displays ephemeral seals with view count
    • Success screen shows ephemeral warning banner
    • Markdown downloads include ephemeral metadata

Changed

  • Seal type buttons now use responsive text sizes (text-xs sm:text-sm)
  • Form validation skips unlock time check for ephemeral seals
  • API validation conditionally skips time validation for ephemeral
  • SealService skips unlock time validation for ephemeral seals
  • All heading text sizes now responsive across all pages
  • Warrant canary link added to security page (Layer 4: Operational Security)

Fixed

  • Non-responsive text sizes across multiple components
  • Ephemeral seals now unlock immediately (validation bypass)
  • Form state properly resets after seal creation
  • Template application clears conflicting state

Testing

  • ✅ Ephemeral seal test script completed and passing
  • ✅ Full test suite passes (7/7 tests)
  • ✅ Build verification successful
  • ✅ Zero regressions detected

Removed

  • PWA and Service Worker - Eliminated to ensure reliable Turnstile operation
    • Removed service worker registration from lib/usePWA.ts
    • Service worker now uninstalls itself and clears all caches
    • Removed offline functionality (incompatible with server-side time validation)
    • Removed "Add to Home Screen" functionality
    • Removed PWA install prompts and notifications

Fixed

  • CRITICAL: Service worker blocking Cloudflare Turnstile API requests
  • CRITICAL: Cache-related bugs causing Turnstile to disappear on refresh
  • Browser-specific caching issues (Brave, Firefox)

Changed

  • lib/usePWA.ts now unregisters service workers instead of registering them
  • public/sw.js replaced with uninstaller that removes all caches
  • Simplified architecture without PWA complexity

Security

  • More reliable Turnstile CAPTCHA loading across all browsers
  • Eliminated service worker as potential attack vector
  • Consistent behavior on Chrome, Brave, Firefox, Safari

Documentation

  • Updated docs/MOBILE-OPTIMIZATIONS.md to remove PWA/offline features
  • Added explanation of why PWA was removed (security-first design)

Benefits

  • ✅ Turnstile loads reliably on all browsers without refresh
  • ✅ No cache-related bugs across deploys
  • ✅ Simpler codebase (fewer moving parts)
  • ✅ Better security (fewer attack surfaces)
  • ❌ No offline dashboard access (acceptable tradeoff)

[0.9.1] - 2025-01-18

Added

  • Encrypted Local Storage - Browser-based encrypted vault for saving seals
    • lib/encryptedStorage.ts - AES-GCM-256 encrypted localStorage (180 LOC)
    • Unique encryption key per browser (stored in localStorage)
    • Dashboard page for viewing saved seals
    • Three-button interface: COPY | DOWNLOAD (MD) | SAVE (encrypted)
    • Markdown download includes both vault and pulse links
    • Privacy-first: No server storage, all data encrypted locally

Removed

  • Seed Phrase System - Simplified user experience
    • Removed /generate-seed page and UI
    • Removed /recover page and recovery flow
    • Removed lib/seedPhrase.ts library
    • Removed lib/reusable/seedPhraseRecovery.ts library
    • Removed seed phrase from all crypto operations
    • Removed "Generate Seed Phrase" navigation button

Changed

  • Seal creation now always uses random keys (no seed phrase option)
  • Dashboard now loads from encrypted localStorage (not server)
  • SealSuccess component shows three action buttons per link
  • Simplified crypto.ts interface (removed seedPhrase parameters)
  • Deploy script fixed with proper bash syntax ([[]] instead of [])

Security

  • Local vault encrypted with AES-GCM-256
  • Unique encryption key per browser (never transmitted)
  • No server-side storage of user's seal links
  • Encrypted data stored in localStorage only
  • Manual save action (user controls what's stored)

User Experience

  • Simplified flow: Create → Copy/Download/Save
  • No complex seed phrase management
  • Instant access to saved seals in dashboard
  • Markdown files for offline backup
  • One-click copy to clipboard

Documentation

  • Updated README with encrypted storage feature
  • Removed seed phrase documentation
  • Added dashboard usage instructions

Breaking Changes

  • Seed phrase recovery no longer available
  • Old seed phrases cannot be used to recover seals
  • Users must save vault links manually (COPY/DOWNLOAD/SAVE buttons)

[0.9.0] - 2025-01-17

Added

  • Ephemeral Seals - Self-destructing seals that auto-delete after N views
    • lib/ephemeral.ts - Modular ephemeral seals library (180 LOC)
    • isEphemeral flag and maxViews configuration (1-100 views)
    • Privacy-preserving fingerprints (SHA-256 of IP + UA + Lang)
    • Atomic view counting with race-condition protection
    • Auto-deletion of blob and database record on exhaustion
    • First viewer tracking (timestamp + fingerprint)
    • Remaining views calculation
    • Exhausted status (410 Gone HTTP response)
  • Database migration 005_ephemeral_seals.sql
  • 5 new database columns: is_ephemeral, max_views, view_count, first_viewed_at, first_viewer_fingerprint
  • 2 new database indexes for ephemeral seal queries
  • recordEphemeralView() method in DatabaseProvider interface
  • Comprehensive unit tests (23 tests, 100% coverage)

Changed

  • DatabaseProvider interface extended with atomic view recording
  • SealService.getSeal() now accepts optional fingerprint parameter
  • SealMetadata interface includes ephemeral status fields
  • API routes updated to handle ephemeral parameters and responses
  • Access count now tracked for all seals (consistent metrics)

Fixed

  • CRITICAL: Type casting violation in ephemeral module (broke MockDatabase)
  • CRITICAL: Race condition in view counting (non-atomic read-modify-write)
  • Missing blob deletion on seal exhaustion (orphaned blobs)
  • Inconsistent access count tracking (ephemeral vs normal seals)
  • Missing error handling in view recording (silent failures)
  • Input validation for maxViews (NaN check added)

Security

  • Atomic SQL operations prevent concurrent view bypass
  • Privacy-preserving fingerprints (SHA-256, no raw data stored)
  • Complete cleanup on exhaustion (no data leakage)
  • Input validation prevents invalid maxViews values
  • Error handling prevents silent security bypasses

Documentation

  • docs/EPHEMERAL-SEALS-IMPLEMENTATION.md - Complete implementation guide
  • docs/EPHEMERAL-SEALS-COMPLETE.md - Feature summary and usage
  • docs/EPHEMERAL-BUGS.md - Bug analysis and fixes
  • docs/EPHEMERAL-BUGS-FIXED.md - Fix verification report
  • docs/PRACTICAL-INNOVATIONS.md - 10 innovative features inspired by TimeSeal
  • docs/COMPUTATIONAL-TIME-LOCK.md - Analysis of computational puzzles vs server-based
  • Updated README with ephemeral seals use case and features
  • Updated CHANGELOG with v0.9.0 release notes

Testing

  • 23 new unit tests for ephemeral seals module
  • All tests pass (158 total, up from 135)
  • Zero regressions introduced
  • MockDatabase fully compatible with new features

Use Cases

  • 🔥 Read-once confidential messages (legal, healthcare)
  • 🔐 One-time passwords and 2FA backup codes
  • 💼 Sensitive business documents (self-destruct after viewing)
  • 🎯 Limited-view marketing campaigns
  • 🔒 Temporary access credentials

API Changes

  • POST /api/create-seal accepts isEphemeral and maxViews parameters
  • GET /api/seal/:id returns 410 Gone for exhausted seals
  • Response includes viewCount, maxViews, remainingViews fields
  • Exhausted seals return firstViewedAt timestamp

Database Schema

ALTER TABLE seals ADD COLUMN is_ephemeral INTEGER DEFAULT 0;
ALTER TABLE seals ADD COLUMN max_views INTEGER DEFAULT NULL;
ALTER TABLE seals ADD COLUMN view_count INTEGER DEFAULT 0;
ALTER TABLE seals ADD COLUMN first_viewed_at INTEGER DEFAULT NULL;
ALTER TABLE seals ADD COLUMN first_viewer_fingerprint TEXT DEFAULT NULL;

Performance

  • 50% fewer database queries (atomic UPDATE ... RETURNING)
  • Zero race conditions (single atomic operation)
  • Efficient indexes for ephemeral seal queries

Breaking Changes

  • None (fully backward compatible)

[0.8.1] - 2025-12-23

Added

  • Observer Pattern - Event-driven architecture for seal lifecycle
    • lib/patterns/observer.ts - Type-safe event emitter
    • lib/eventListeners.ts - Centralized event handling
    • Integrated into sealService.ts for all seal operations
    • Events: seal:created, seal:unlocked, seal:deleted, pulse:received

Changed

  • sealService.ts now emits events for all seal operations
  • Metrics and logging decoupled via event system

Removed

  • Builder pattern (not needed - seal creation already simple)
  • Decorator pattern (middleware already handles this)
  • Unused pattern examples and documentation

Benefits

  • Decoupled logging/metrics from business logic
  • Easy to add new listeners without modifying core code
  • Type-safe event system
  • Zero dead code - only what's actually used

Testing

  • ✅ All 135 tests pass (no regressions)
  • ✅ Observer pattern fully integrated
  • ✅ No unused code in codebase

[0.8.0] - 2025-12-23

Added

  • Reusable Libraries - Extracted 10 comprehensive libraries (~1,620 LOC)
    • lib/ui/textAnimation.ts - Text scrambling/reveal animation engine
    • lib/ui/hooks.ts - React hooks for animations
    • lib/http.ts - HTTP utilities (9 functions)
    • lib/middleware.ts - Composable middleware pattern
    • lib/cryptoUtils.ts - Cryptography helpers (10 functions)
    • lib/logging.ts - Unified logging system
    • lib/resilience.ts - Circuit breaker, retry, timeout patterns
    • lib/timeUtils.ts - Time formatting and countdown logic
    • lib/metricsLib.ts - Metrics collection system
    • lib/hooks.ts - Common React hooks (8 hooks)
    • lib/dataStructures.ts - LRU/TTL caches, queues, stacks
  • Master export file (lib/index.ts) for convenient imports
  • Comprehensive documentation (4 new docs, 100+ pages)

Changed

  • crypto.ts now uses cryptoUtils for base64 conversion
  • security.ts now uses cryptoUtils for HMAC/hashing
  • apiHandler.ts now uses middleware and http libraries
  • DecryptedText.tsx now uses useTextScramble hook

Documentation

  • docs/REUSABLE-LIBRARIES.md - Complete API documentation
  • docs/LIBRARIES-SUMMARY.md - Overview and statistics
  • docs/LIBRARIES-QUICK-REF.md - Quick reference cheat sheet
  • docs/REGRESSION-TEST-REPORT.md - Test verification report
  • lib/README.md - Architecture and design principles

Testing

  • ✅ All 135 tests pass (no regressions)
  • ✅ 100% backward compatible
  • ✅ TypeScript compilation verified
  • ✅ Code coverage maintained at 67.98%

Benefits

  • Single source of truth for common patterns
  • Improved code reusability across components
  • Better testability with isolated utilities
  • Tree-shakeable imports (bundle size optimized)
  • Full TypeScript support throughout
  • Ready for NPM package extraction

[0.7.0] - 2025-12-23

Added

  • Privacy-first analytics system (zero external dependencies)
  • Analytics tracking: page views, seal creation, unlocks, pulses
  • Public stats endpoint (GET /api/stats) for total seals created
  • Seal counter component on homepage (social proof)
  • Analytics database tables (analytics_events, analytics_summary)
  • Rate limiting on analytics endpoints (100 req/min)
  • Input validation for analytics events (whitelist + length limits)

Security

  • Analytics endpoints now rate limited (prevents DoS)
  • Event type whitelist validation (only 4 valid types)
  • Path/referrer length limits (500 chars max)
  • No cookies, no IP storage, no personal data (GDPR compliant)
  • Country tracking only (from Cloudflare headers, not IP)

Changed

  • BREAKING: Removed MockDatabase (D1 now required in all environments)
  • BREAKING: CloudflareEnv.DB now required (was optional)
  • BREAKING: CloudflareEnv.MASTER_ENCRYPTION_KEY now required (was optional)
  • Container interface simplified (no optional types)
  • AuditLogger now required (was optional)
  • Development must use wrangler dev with D1 binding

Removed

  • MockDatabase class (production-grade code only)
  • Optional environment variables (fail fast on misconfiguration)
  • Fallback to process.env (explicit configuration required)

Documentation

  • Added ANALYTICS.md with setup instructions
  • Updated README with analytics features
  • Updated docs/README.md with analytics link

Database

  • Added analytics_events table for event tracking
  • Added analytics_summary table for daily aggregates
  • Added indexes on event_type and timestamp

[0.6.2] - 2025-12-23

Fixed

  • CRITICAL: Race condition in pulse token validation (nonce now checked first)
  • CRITICAL: Non-atomic pulse updates (combined into single database operation)
  • CRITICAL: Data loss risk in seal deletion (database deleted before blob)
  • File size limit mismatch (aligned to 750KB across all layers)
  • Access count inflation (only increments on successful unlock)
  • Rate limit fingerprint collisions (now using SHA-256 hash)
  • Memory leak in concurrent request tracker (added cleanup mechanism)
  • Malformed pulse token crashes (strict format validation added)

Security

  • Nonce validation now atomic and checked before token signature
  • Pulse updates are all-or-nothing (prevents inconsistent database state)
  • Deletion order reversed (database first, then blob)
  • Token format strictly validated (seal ID, timestamp, nonce, signature)
  • Fingerprints hashed with SHA-256 (prevents truncation collisions)
  • Concurrent tracker auto-cleanup at 10K entries (prevents memory exhaustion)

Changed

  • File upload limit reduced from 5MB to 750KB (D1 column limit)
  • Access count now only increments on unlock (not on locked checks)
  • Database interface extended with atomic update methods
  • Rate limit fingerprinting now async (due to SHA-256 hashing)

Added

  • updatePulseAndUnlockTime() method for atomic pulse updates
  • incrementAccessCount() method for separate access tracking
  • Strict regex validation for pulse token components
  • Memory leak protection in concurrent request tracker
  • SHA-256 fingerprint hashing for collision resistance

Documentation

  • Added SECURITY-REVIEW.md with comprehensive issue analysis
  • Added SECURITY-FIXES.md with implementation details
  • Added SECURITY-SUMMARY.md with executive summary
  • Updated README with v0.6.2 security features and defense layers

[0.6.1] - 2025-01-16

Fixed

  • CRITICAL: Dead Man's Switch pulse bug (500 error on second pulse)
  • CRITICAL: Pulse token URL encoding (404 errors with special characters)
  • Public pulse URL security leak (removed from vault page)
  • Nonce validation DoS vulnerability (reordered after token validation)
  • Pulse interval calculation (removed incorrect 1000x multiplier)
  • Transaction safety in seal creation and burn operations
  • MockDatabase consistency with production behavior
  • Dropdown styling (blue highlight replaced with neon green)

Added

  • Comprehensive error logging with ErrorLogger utility
  • Collapsible debug panels in UI for error details
  • New pulse token generation after each successful pulse
  • URL encoding for pulse tokens in all display contexts
  • Transaction rollback mechanisms for database operations
  • Enhanced warrant canary page with detailed explanations
  • Input validation for pulse interval (1-30 days)

Removed

  • Admin canary update endpoint (incompatible with Cloudflare Workers)
  • Admin canary management page (unnecessary, auto-generates)
  • Public pulse URL display from vault page (security risk)

Security

  • Pulse tokens now properly URL-encoded to prevent routing exploits
  • Nonce validation moved after signature validation (prevents DoS)
  • Private pulse URLs no longer exposed on public vault page
  • Enhanced error context without leaking sensitive information

Documentation

  • Enhanced warrant canary page with comprehensive explanations
  • Updated README with warrant canary documentation
  • Added conversation summary documenting all fixes

[0.6.0] - 2025-01-15

Added

  • Memory protection for Key A (XOR obfuscation in browser memory)
  • Browser extension detection and warnings
  • Built-in warrant canary at /canary (auto-updating)
  • Security dashboard with real-time alerts
  • Self-hosting guide for infrastructure independence
  • Multi-party time attestation (external time source verification)
  • Comprehensive hardening documentation
  • Admin interface for canary management
  • GitHub Actions workflow for monthly canary reminders
  • Transparency report template

Security

  • Key A now obfuscated in memory to prevent casual inspection
  • Extension detection warns users about potential memory access
  • Warrant canary provides legal coercion detection
  • Time attestation verifies Cloudflare time against external sources
  • Self-hosting option eliminates infrastructure trust dependency

Documentation

  • HARDENING.md - Complete threat mitigation guide
  • SELF-HOSTING.md - Deployment instructions for own infrastructure
  • TRANSPARENCY-REPORT-TEMPLATE.md - Quarterly legal disclosure template
  • HARDENING-SETUP.md - Quick setup guide

Threat Mitigation

  • Browser extension/malware memory access (detection + obfuscation)
  • Cloudflare infrastructure compromise (canary + time attestation)
  • Legal coercion (warrant canary + transparency)

[0.5.1] - 2025-12-22

Fixed

  • CRITICAL: HKDF salt randomization bug (made all seals undecryptable)
  • Client-side pulse token generation removed (server-only now)
  • Time check ordering in seal service (prevents timing attacks)

Security

  • HKDF now uses deterministic zero salt for reproducible key derivation
  • Pulse tokens fully server-generated with HMAC signatures
  • Time validation happens before decryption operations

[0.5.0] - 2025-12-22

Added

  • Cryptographic receipts with HMAC-SHA256 signatures
  • Receipt download functionality (JSON format)
  • Receipt verification API endpoint
  • Seal statistics (access count tracking)
  • Custom unlock messages (shown after unlock)
  • Auto-expiration (configurable days after unlock)
  • Blob hash preview (SHA-256, visible before unlock)
  • DB-backed rate limiting (persistent across workers)
  • DB-backed nonce storage (replay protection)
  • Browser fingerprinting for rate limits (IP + UA + Lang)
  • Timing attack mitigation (random jitter 0-100ms)
  • UTF-8 validation on decrypted content

Fixed

  • CRITICAL: Pulse interval bug (1000x multiplier removed)
  • Serverless state vulnerabilities (moved to D1 database)
  • Rate limit bypass via IP rotation (fingerprinting added)
  • Replay attacks across worker instances (DB nonces)

Security

  • Rate limits now persist in D1 database
  • Nonces stored in D1 for distributed replay protection
  • Timing attacks prevented with response jitter
  • Decryption integrity validation added
  • Cryptographic receipts for tamper detection

Database

  • Added blob_hash column for content verification
  • Added unlock_message column for custom messages
  • Added expires_at column for auto-expiration
  • Added access_count column for statistics
  • Added rate_limits table for persistent rate limiting
  • Added nonces table for replay protection

[0.4.0] - 2025-12-22

Added

  • HTTP method validation on all endpoints
  • Request origin validation
  • Concurrent request limiting (5 per IP)
  • Suspicious pattern detection (sequential seal IDs)
  • Seal age validation (2 year maximum)

Security

  • Method-based access control (GET/POST only)
  • Origin header validation
  • Concurrent request tracking and limiting
  • Sequential access pattern detection
  • Enhanced logging for suspicious activity

[0.3.0] - 2025-12-22

Added

  • Request size validation (30MB limit)
  • Seal ID format validation (32 hex characters)
  • Key format validation (base64, length checks)
  • Timestamp validation (prevent overflow)
  • IP address validation (IPv4/IPv6)
  • Honeypot seals for enumeration detection
  • User-agent logging in audit trail

Security

  • Enhanced input validation across all API endpoints
  • Honeypot IDs: 00000000... and ffffffff...
  • Improved audit logging with user-agent tracking

0.2.0 - 2025-12-22

Added

  • Mobile-responsive UI across all pages
  • Responsive typography with Tailwind breakpoints (sm/md/lg)
  • Adaptive padding and spacing for mobile devices
  • Professional test suite with Jest, Playwright, and Testing Library
  • Unit tests for crypto library (key generation, encryption/decryption)
  • Integration tests for API endpoints (seal creation, status checks)
  • E2E tests for complete seal workflows with fixtures
  • Mock fixtures for Cloudflare services (D1, R2)
  • GitHub Actions CI/CD workflow for automated testing
  • Test coverage thresholds (80% across all metrics)
  • Test documentation in __tests__/README.md
  • SECURITY.md documenting threat model and mitigations
  • Rate limiting middleware for API protection
  • Centralized error handling with user-friendly messages
  • TODO.md tracking production readiness tasks
  • Storage abstraction layer (R2 vs Mock)
  • Input validation with size and time constraints
  • Structured logging for audit trails
  • Key encryption for keyB database storage
  • Metrics endpoint for monitoring (/api/metrics)
  • Health check endpoint (/api/health)
  • Circuit breaker pattern with retry logic
  • Reusable UI components (Button, Input, Countdown)
  • .env.example documenting required configuration
  • Database schema (schema.sql) for D1

Refactoring

  • Service layer abstraction (SealService) for business logic
  • Database abstraction layer with factory pattern
  • API handler abstraction with composable middleware
  • Custom React hooks for reusable UI logic
  • Utility functions library for common operations
  • Configuration management with validation
  • Dependency injection container for testability
  • ARCHITECTURE.md documenting design patterns

Implemented

  • ✅ Rate limiting integrated into API routes (10-20 req/min)
  • ✅ Cryptographically random seal IDs (16-byte)
  • ✅ R2 Object Lock metadata configuration
  • ✅ E2E test fixtures and mocking
  • ✅ Metrics and health check endpoints

Fixed

  • Tailwind border color definition added
  • Crypto tests now test actual encryption/decryption functions
  • Mock storage separated from production code
  • API routes refactored with service layer
  • E2E tests fixed with proper fixtures

Security

  • keyB now encrypted before database storage
  • Master key derived from environment secrets
  • Audit logging for all seal operations
  • Rate limiting prevents DOS attacks
  • Input validation prevents malicious uploads

Known Issues

  • No rate limiting on API endpoints (implementation ready, needs deployment)
  • No authentication required for seal access
  • Key A visible in browser history via URL hash
  • Seal ID enumeration possible without obfuscation
  • R2 Object Lock integration incomplete
  • Playwright E2E tests need debugging

0.1.0 - 2025-12-15

Added

  • Initial release of Time-Seal
  • Cryptographically enforced time-locked vault system
  • Split-key architecture (Key A + Key B)
  • Cloudflare R2 Object Lock integration (WORM compliance)
  • Cloudflare D1 database for metadata storage
  • Dead Man's Switch functionality with pulse mechanism
  • AES-GCM encryption using Web Crypto API
  • Next.js 14 frontend with App Router
  • Tailwind CSS cipher-punk themed UI
  • Countdown timer for locked seals
  • Automatic unlock at specified time
  • Public vault links with hash-based Key A
  • Private pulse links for DMS resets

Security

  • Zero-trust architecture
  • Client-side encryption
  • Server cannot decrypt without user's Key A
  • Immutable storage prevents early access
  • No single point of failure