If you've lost access to your Krux hardware wallet or need to recover your Bitcoin from a backup, writing a custom Python recovery script can be a powerful solution. Krux is an open-source, DIY Bitcoin hardware wallet that relies on BIP39 mnemonic phrases and BIP32 hierarchical deterministic key derivation. In this Krux wallet recovery script Python tutorial, we'll walk you through building a recovery tool from scratch, step by step. Whether you have a full 12/24-word mnemonic, a partial seed phrase, or need to verify addresses, this guide provides practical, secure methods to regain access to your funds.
Before diving in, remember that all recovery operations should be performed on an offline, air-gapped computer to prevent private key leakage. For more comprehensive recovery strategies and tools, visit Crypto Wallet Recovery Guide at / – your trusted resource for Bitcoin, Ethereum, and other cryptocurrency wallet recovery.
Understanding Krux Wallet Recovery
Krux wallet generates a BIP39 mnemonic (12 or 24 words) and derives keys using BIP32/BIP44 standards. The recovery process involves:
- Mnemonic validation: Checking the checksum of your seed phrase.
- Seed generation: Converting the mnemonic to a binary seed using PBKDF2.
- Key derivation: Deriving the master private key and child keys for Bitcoin addresses (typically m/84'/0'/0' for native SegWit).
- Address generation: Creating addresses to check balances and sweep funds.
If you have a full mnemonic, recovery is straightforward. If you have a partial mnemonic or suspect word errors, you'll need to incorporate a wordlist and brute-force logic. Our Python script will handle both scenarios.
Prerequisites for the Python Recovery Script
Ensure you have Python 3.8+ installed. We'll use the following libraries:
bip_utils: For BIP39/BIP32 operations.mnemonic: For mnemonic validation and seed generation.requests(optional): To check balances via a blockchain API, but only use offline if possible.
Install them via pip:
pip install bip_utils mnemonic
For maximum security, download the libraries on a clean machine and transfer them offline.
Step-by-Step: Writing the Krux Wallet Recovery Script
Step 1: Validate and Parse the Mnemonic
Start by creating a function to validate your mnemonic. Krux uses standard BIP39 wordlists (English, Spanish, etc.). Here's a basic validation check:
from mnemonic import Mnemonic
def validate_mnemonic(mnemonic_phrase, language='english'):
mnemo = Mnemonic(language)
if mnemo.check(mnemonic_phrase):
return True
return False
If your mnemonic has a checksum error, you'll need to explore word replacements. For partial mnemonics, we'll cover that in Step 4.
Step 2: Derive Keys and Addresses
Using bip_utils, derive the Bitcoin native SegWit address (BIP84) which Krux commonly uses. You can also derive legacy or nested SegWit if needed.
from bip_utils import Bip39SeedGenerator, Bip84, Bip84Coins, Bip44Changes
def derive_addresses(mnemonic_phrase, passphrase='', num_addresses=5):
seed = Bip39SeedGenerator(mnemonic_phrase).Generate(passphrase)
bip84 = Bip84.FromSeed(seed, Bip84Coins.BITCOIN)
bip84_acct = bip84.Purpose().Coin().Account(0)
bip84_chg = bip84_acct.Change(Bip44Changes.CHAIN_EXT)
addresses = []
for i in range(num_addresses):
addr = bip84_chg.AddressIndex(i).PublicKey().ToAddress()
addresses.append(addr)
return addresses
This generates the first few receiving addresses. You can extend num_addresses to check more.
Step 3: Check Balances and Sweep Funds
To verify if an address holds Bitcoin, you can query a blockchain explorer API. However, for privacy, use your own node or an offline method. Here's a minimal example using Blockstream's API (use only with a throwaway address to avoid privacy leaks):
import requests
def check_balance(address):
url = f"https://blockstream.info/api/address/{address}"
response = requests.get(url)
data = response.json()
funded = data['chain_stats']['funded_txo_sum']
spent = data['chain_stats']['spent_txo_sum']
return (funded - spent) / 1e8 # BTC
Important: Never expose your private keys or mnemonic online. Only paste public addresses into APIs.
Step 4: Handling Partial Mnemonics (Word Recovery)
If you remember only some words or suspect typos, you can brute-force the missing words using the BIP39 wordlist. The script must ensure the final mnemonic passes the checksum. This is computationally heavy—optimize by using the last word as a checksum candidate.
from itertools import product
from mnemonic import Mnemonic
def recover_partial_mnemonic(known_words, wordlist, language='english'):
mnemo = Mnemonic(language)
# Example: known_words is a list with None for missing positions
missing_indices = [i for i, w in enumerate(known_words) if w is None]
for combo in product(wordlist, repeat=len(missing_indices)):
candidate = known_words.copy()
for idx, word in zip(missing_indices, combo):
candidate[idx] = word
candidate_str = ' '.join(candidate)
if mnemo.check(candidate_str):
return candidate_str
return None
For 12-word mnemonics with one missing word, this runs in seconds. For multiple missing words, consider using GPU acceleration or tools like btcrecover (mentioned in our Crypto Wallet Recovery Guide).
Security Best Practices for Krux Wallet Recovery
- Offline execution: Run the script on an air-gapped machine. Never store mnemonics on internet-connected devices.
- Use a clean Python environment: Avoid third-party packages with potential backdoors.
- Test with a small amount first: Before sweeping large funds, verify the script works with a known wallet.
- Backup multiple copies: Store your mnemonic in multiple secure locations (e.g., metal plates, encrypted USB drives).
- Consider hardware wallet alternatives: If you're uncomfortable writing code, use Krux's built-in recovery features or consult professional recovery services.
Advanced: Automating the Recovery Workflow
You can combine the functions into a full recovery script that prompts for mnemonic input, derives addresses, checks balances, and even constructs a raw transaction to sweep funds. For sweeping, you'll need to use a library like bitcoinlib or sign transactions offline. Always double-check the destination address and fee before broadcasting.
For more advanced scripts and recovery techniques for Krux, Ledger, Trezor, and other wallets, explore the tutorials at Crypto Wallet Recovery Guide ( / ). Our guides cover BIP39/BIP32 internals, password cracking with HashCat, and seed phrase reconstruction strategies.
Conclusion
Writing a Krux wallet recovery script in Python is an empowering way to regain control of your Bitcoin when standard recovery methods fall short. By following this tutorial, you've learned how to validate mnemonics, derive addresses, check balances, and even recover partial seed phrases. Always prioritize security and test thoroughly. If you encounter complex scenarios or need expert guidance, remember that Crypto Wallet Recovery Guide is here to help you navigate every step of cryptocurrency wallet recovery.
Disclaimer: This tutorial is for educational purposes only. Recover only wallets you own. The authors are not responsible for any loss of funds or legal consequences.