Chance Bitcoin Wallet: Swift Open-Source iOS Bitcoin Wallet

Introduction

Chance Bitcoin Wallet is a lightweight iOS Bitcoin wallet application designed for mobile devices. Unlike full-node wallets, it prioritizes secure private key storage while enabling essential Bitcoin transactions—creating accounts, sending/receiving Bitcoin, querying balances, and wallet backup/restoration.

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Key Features

• Swift Open-Source: Built with Swift 3.0+ for iOS 9 and above.
• Hierarchical Deterministic (HD) Model: Generates nearly 2.1 billion sub-addresses from a single recovery phrase.
• Multi-Signature Support: Enhanced security via collaborative transaction signing.
• Remote Node Integration: Connects to trusted nodes (e.g., Blockchain.info, BitPay Insight) without full blockchain sync.
• Keychain Encryption: Secures private keys locally using Apple’s Keychain.
• Touch ID & iCloud Backup: Biometric authentication and optional iCloud sync for account data.

Data Structure

1. Recovery Phrase & Password:

   • Stored via Keychain; required for wallet restoration.

2. Account System:

   • HD/multi-signature account metadata (e.g., derivation paths, redeem scripts).

3. Transaction Data:

   • Synced from trusted nodes; stored locally.

Security Protocols

• Private Key Handling: Never leaves the device; signed transactions use SIGHASH_ALL to prevent tampering.
• Multi-Signature Workflow: Utilizes a custom protocol (multisig:) for collaborative signing without exposing private keys.

Example Protocol Snippet:

{
  "rawTx": "01000000021138...",
  "redeemScriptHex": "532103324c4...",
  "keySignatures": {
    "0": ["3045022100..."],
    "2": ["3044022059bd..."]
  }
}

Testnet & Development

• Testnet Debugging: Switch to testnet nodes in settings.

• Future Plans:

  • Swift-based Bitcoin Core implementation.
  • Global Bitcoin price alerts.
  • Decentralized wallet services for messaging and transactions.

Risks & Donations

• Risks:

  • Loss of recovery phrase = irreversible asset loss.
  • Dependency on trusted nodes (if offline, switch nodes or export private keys).
• Donate BTC: 3G4NdQQyCJK1RS5URb4h5KogWEyR4Mk16A

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FAQs

Q1: Is Chance Wallet a full-node wallet?
A: No—it’s a lightweight wallet optimized for mobile use.

Q2: How do I restore my wallet?
A: Use your recovery phrase and password on a new device.

Q3: What happens if a multi-signature participant loses their key?
A: Assets become inaccessible if signatures fall below the threshold.

Q4: Can I use this wallet on Android?
A: Currently iOS-only; no Android version exists.

Q5: How are transactions broadcast?
A: Via trusted nodes; private keys never leave the device.

Q6: Is iCloud backup secure?
A: Only account metadata syncs—private keys remain device-bound.