Chance Bitcoin Wallet – Open-Source Swift-Based iOS Wallet for Secure BTC Management

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Bitcoin has revolutionized personal finance, and with the rise of mobile-first solutions, secure, lightweight wallets are more important than ever. Chance Bitcoin Wallet is a privacy-focused, open-source iOS application designed to give users full control over their BTC assets—without the complexity of running a full node. Built with Swift and optimized for iOS 9+, this wallet strikes a balance between security, usability, and portability.

Whether you're a casual user or a tech-savvy enthusiast, Chance Bitcoin Wallet provides essential Bitcoin functionality while ensuring your private keys never leave your device.

✨ Key Features of Chance Bitcoin Wallet

Open-Source Swift Architecture

Developed entirely in Swift 3.0, Chance Bitcoin Wallet is transparent and community-driven. Its open-source nature allows developers and security experts to audit the codebase, ensuring no backdoors or malicious logic exist. This transparency builds trust and promotes long-term sustainability.

👉 Discover how open-source wallets enhance your crypto security

Hierarchical Deterministic (HD) Wallet Model

The wallet uses the HD wallet standard, enabling users to generate up to approximately 2.1 billion sub-accounts from a single seed phrase. This means you only need to back up one recovery phrase and password to restore your entire wallet ecosystem across devices.

This model improves privacy by allowing unique addresses for each transaction, reducing traceability on the blockchain.

Multi-Signature Support for Enhanced Security

For users seeking maximum protection, multi-signature (multisig) accounts are supported. These require multiple private keys to authorize a transaction—ideal for shared funds, joint accounts, or cold storage setups.

With multisig, even if one key is compromised, your funds remain protected.

Remote Node Integration

Rather than syncing the full blockchain (which can take hours and consume gigabytes), Chance Bitcoin Wallet connects to trusted remote nodes like blockchain.info and insight.bitpay.com. This allows for:

Your private keys stay local during the signing process—only the signed transaction is sent to the node.

Secure Keychain Encryption

Private keys are stored using Apple’s Keychain Services, one of the most secure storage mechanisms available on iOS. Keys are encrypted and bound to your device—never uploaded to iCloud or transmitted over the network.

Even if someone gains access to your device, biometric authentication via Touch ID adds an extra layer of protection.

iCloud Sync for Account Metadata

While private keys remain strictly on-device, the wallet’s account structure data (like HD paths and multisig redemption scripts) can be synced via iCloud. This enables seamless migration to a new device when restoring with your recovery phrase.

🔐 Security Design Principles

Recovery Phrase + Password Protection

Your wallet is secured by two components:

  1. A 12–24 word recovery phrase (BIP39 standard)
  2. A user-defined password

Even if your recovery phrase is exposed, without the password, attackers cannot reconstruct your wallet. This dual-factor mechanism significantly increases resistance to theft.

⚠️ Important: Never share your password. It cannot be recovered.

Transaction Signing with SIGHASH_ALL

All transactions use the SIGHASH_ALL signature type—the most common and secure method in Bitcoin. This ensures that every input and output in a transaction is cryptographically locked. A remote node cannot alter where funds are sent after signing.

Each input is signed individually using your private key, then reassembled into a final broadcast-ready transaction.

Private Key Isolation

Only sub-account private keys are ever exposed in the interface—the master private key is never shown or exported. This minimizes exposure risk and aligns with best practices in wallet design.

💾 Data Architecture Overview

The app organizes data into three distinct layers:

1. Recovery Phrase & Password

Stored exclusively in the device’s Keychain. Not backed up to iCloud for security reasons. Must be manually recorded by the user.

2. Account Structure Data

Includes:

Saved in a local Realm database, encrypted and optionally synced via iCloud using a filename derived from the seed hash. Allows multiple configurations across devices.

3. Transaction History

Fetched from remote nodes and cached locally. Not synced via iCloud due to size constraints and privacy considerations.

🤝 Multi-Signature Transaction Protocol

Chance Bitcoin Wallet implements a custom multisig transaction protocol to streamline collaborative spending without compromising security.

When initiating a multisig transaction:

  1. The sender creates an unsigned transaction (rawTx)
  2. Includes the redeemScriptHex so signers can verify address ownership
  3. Uses a JSON-based format prefixed with multisig:

Example payload:

multisig:{"rawTx":"0100000...","redeemScriptHex":"532103324c4...","keySignatures":{"0":["30450221..."]}}}

Each participant signs their portion and forwards it. The system validates signature order based on the redeem script’s public key sequence (required by Bitcoin’s stack-based scripting). Once all required signatures are collected, the final party broadcasts the transaction.

Note: This protocol is application-specific and not part of an official BIP, but it ensures compatibility within the Chance ecosystem.

👉 Learn how multisig wallets protect your digital assets

🧪 Testnet Support for Developers

Developers can test features using Bitcoin testnet:

This allows safe experimentation with sending, receiving, and multisig workflows before using real funds.

🚀 Future Development Roadmap

The project aims to evolve beyond a simple mobile wallet:

Swift-Based Bitcoin Core Implementation

Currently relying on the mature coreBitcoin (Objective-C) library, the team plans to build a native Swift implementation of Bitcoin Core. Benefits include:

Real-Time Market Data Subscription

Integration of live Bitcoin price feeds and market alerts directly within the app.

Open Wallet Service Platform

A decentralized communication layer for:

⚠️ Risk Awareness & Best Practices

While Chance Bitcoin Wallet prioritizes security, users must understand inherent risks:

Apple’s closed ecosystem also raises theoretical concerns about potential backdoors—though no evidence exists.

🙏 Community Support & Donations

As an open-source initiative, ongoing development depends on community support. Users who benefit from the wallet are encouraged to contribute:

These contributions help maintain code quality, add features, and ensure long-term viability.

👉 Support open-source innovation in crypto

Frequently Asked Questions (FAQ)

Q: Can I recover my wallet without iCloud?
A: Yes. As long as you have your recovery phrase and password, you can restore your HD accounts and private keys. iCloud only syncs metadata—not essential for recovery.

Q: Is my private key ever sent to the server?
A: No. All signing happens locally on your device. Only fully signed transactions are broadcast via remote nodes.

Q: What happens if a remote node shuts down?
A: Your funds are safe. You can either wait for an app update with new nodes or export your private keys to another wallet that supports import.

Q: How many devices can I use with one wallet?
A: Unlimited—but each device must be individually set up using the same recovery phrase and password.

Q: Can I use this wallet on Android?
A: Not currently. It's iOS-only due to its reliance on Swift and Apple’s Keychain system.

Q: Why isn’t this wallet using BIP44 or BIP49 standards?
A: It follows HD principles but uses a proprietary account structure. Always use the same app to restore for compatibility.

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