Disclaimer: Use at your own risk. Always verify the integrity of the downloaded file.
The classic offline BTC cold wallet generation tool
bitaddress.org has been a staple in my beginner courses for years. However, it has two major limitations:
- It only supports P2PKH (legacy addresses starting with 1) and does not support Native SegWit (bech32 addresses starting with bc1q) which are widely used by modern wallets today.
- It exports raw private keys in WIF format but does NOT generate BIP-39 mnemonic phrases.
After reading the
BIP-361 quantum migration proposal, I think that in the future, mnemonics will be the key credential for proving address ownership (Phase C plans to use zero-knowledge proofs for fund recovery). Having just the private key alone won't be enough. This motivated me to build the generator as follows.
🔧 Features
- Two Entropy Sources: Brain wallet (SHA256ⁿ / password with optional #iterations) OR Secure random numbers (mouse + keyboard entropy collection via ArcFour PRNG).
- Legacy Paths: P2PKH (uncompressed public key) + Native SegWit (compressed public key) with QR code generation.
- Mnemonic Path: BIP39 (12/24 words) → PBKDF2 → BIP32 HD → m/84'/0'/0'/0/{0..9}.
- Mnemonic Recovery: Restore seed and generate a list of 10 HD addresses from your mnemonic phrase.
- Built-in Verification: Validate mnemonics, private key WIF, and address formats.
- Bilingual UI: One-click switch between Chinese and English.
- Fully Offline: Built with grunt into a single HTML file — open it directly in your browser, no internet connection required.
⚙️ Technical Implementation
The tool reuses core cryptographic libraries from bitaddress.org (CryptoJS, secp256k1, BigInteger, etc.), while the following modules are newly written:
- SHA-512
- Bech32 encoding
- BIP39 mnemonic engine
- BIP32 HD wallet derivation
There are no runtime dependencies — it's pure front-end JavaScript.
✅ All core test vectors pass (reusing known data from brainwallet.js). The 24-word mnemonic generated from the password
"test" and the corresponding BIP84 addresses are fully consistent with standard implementations.
🔗 Links
⚠️ Disclaimer
THIS TOOL IS PROVIDED "AS IS" WITHOUT ANY WARRANTY. The algorithm and data implementations may contain errors.
Please cross-validate all generated addresses using multiple independent tools before transferring any real funds. Use at your own risk.
Feedback, bug reports, and pull requests are all welcome!
Donation: bc1q4yt2sa60sx38u40msye936hst6fadqxw70vhzv
#Bitcoin #ColdWallet #BTC #OpenSource #BIP39 #BIP84 #BIP32
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