Overview

Hologram is a comprehensive desktop application that provides complete access to the DERO blockchain ecosystem.

Architecture

┌───────────────────────────────────────────────────────────┐
│  Frontend (Svelte)                                        │
│  Explorer | Browser | Wallet | Studio | Settings          │
│  ┌─────────────────────────────────────────────────────┐  │
│  │  Backend (Go / Wails)                               │  │
│  │  Daemon Client | Gnomon | Wallet Manager | XSWD     │  │
│  │  ┌───────────────────────────────────────────────┐  │  │
│  │  │  Storage (Graviton)                           │  │  │
│  │  │  TELA Cache | NRS Cache | Offline | Prefs     │  │  │
│  │  └───────────────────────────────────────────────┘  │  │
│  └─────────────────────────────────────────────────────┘  │
└───────────────────────────────────────────────────────────┘

Connection Modes

Network Support

• Mainnet: Full production network
• Testnet: Development and testing
• Simulator: Local development environment with instant blocks

Key Components

TELA Browser Engine

The TELA Browser enables accessing decentralized web applications stored entirely on the DERO blockchain. Features include:

• Address bar navigation (SCID, dero:// URLs, name lookup)
• Automatic content assembly from INDEX contracts
• Gzip decompression for compressed content
• Versioned caching with auto-invalidation (Offline-First)
• External reference inlining
• Shard and library support
• Full security features including iframe sandboxing and CSP management

Gnomon Indexer

Gnomon is a decentralized blockchain indexer that:

• Discovers and catalogs TELA applications
• Tracks smart contract state at any height
• Provides full-text search capabilities
• Manages ratings and name resolution

telaHost Bridge

The telaHost API is a native JavaScript API available to all TELA apps (like window.ethereum for Web3):

• Clean async interface to blockchain
• Wallet operations with approval modals
• No XSWD WebSocket complexity
• Zero configuration required

Sign In with DERO (HOLOGRAM-Exclusive)

HTTPS-compatible wallet authentication using an OAuth-style redirect flow. Websites can let visitors sign in with their DERO address — HOLOGRAM is the only wallet that supports this because it exposes local HTTP auth endpoints that bypass browser mixed content restrictions. Other wallets rely on WebSocket-only (ws://) which browsers block on HTTPS pages.

Version Control System

Git-like version control for TELA applications:

• View commit history for any INDEX
• Compare versions side-by-side
• Clone content at specific commits using scid@txid
• Accessible from Studio, Explorer, and Browser

Villager Avatar System

Visual identity integration for connected wallets:

• Address-derived unique identicon frames
• Custom avatar pixel overlay support
• Displayed in sidebar wallet indicator
• Cached locally for performance

Sync Manager (Offline-First)

Batch sync and version control for cached TELA apps:

• Clone all favorites with rating threshold filter
• Check cached apps for on-chain updates
• Visual diffing before updating local copies
• True offline operation after initial sync

Developer Support (EPOCH)

Passive hashing system to support TELA app developers:

• EPOCH handler processes hash requests from dApps
• DevSupportWorker runs passive background hashing
• Rewards go to app developers (not users)
• Configurable in Settings > Developer Support

Performance Targets