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Developer Guide
  • Wallet SDK
    • Wallet Overview
    • Getting Started
      • 1. Start the RAILGUN Privacy Engine
      • 2. Build a persistent store for artifact downloads
      • 3. Load a Groth16 prover for each platform
      • 4. Add networks and RPC providers
      • 5. Set up a debug logger
    • Private Wallets
      • RAILGUN Wallets
      • View-Only Wallets
      • Encryption Keys
    • Private Balances
      • Balance and Sync Callbacks
      • Updating Balances
      • QuickSync
    • Transactions
      • Shielding
        • Shield ERC-20 tokens
        • Shield base token
        • Shield NFTs
      • Private Transfers
        • Private ERC-20 Transfers
        • Private NFT Transfers
      • Cross-Contract Calls
      • Unshielding
        • Unshield ERC-20 tokens
        • Unshield base token
        • Unshield NFTs
      • UX: Private Transactions
    • Broadcasters
  • Cookbook SDK
    • Cookbook Overview
    • Recipe Guide: Write a zkApp
      • "Step" — A smart contract call
      • "Recipe" — Steps in series
      • "Combo Meal" — 2+ Recipes
    • Use your zkApp privately
  • Engine SDK
    • Engine Overview
  • ZK Account Abstraction
    • Account Abstraction Overview
    • Getting started with the contracts
    • Wallets
    • State Structure
    • Example Primitives
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  1. Wallet SDK

Private Balances

Overview

RAILGUN private (shielded) balances are built through a registry of UTXOs (unspent transaction outputs), similar to Bitcoin. The primary difference is that the RAILGUN UTXO list is encrypted with the sender and receiver’s keys, meaning that no outsider can view the contents of the UTXO.

The entire list of RAILGUN UTXOs makes up a merkle tree data structure, which is a structured list of hashes which is used to validate the balance state during transactions.

While generating the most up-to-date merkle tree, each commitment leaf (which represent a transaction) must be synced and decrypted in order to build a RAILGUN wallet’s private balance. This syncing process can take a few minutes. Once the sync is complete, UTXO token balances are aggregated into a user’s balance.

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Last updated 8 months ago