TAPSIGNER Recovery Guide: Changing Phones, Forgotten PIN, or Lost Card

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One of the top concerns for those entering the world of Bitcoin self-custody is: "If one day my phone breaks, I change devices, forget my password, or lose my equipment, how can I recover my wallet and coins?"

For users of portable hardware cards like the TAPSIGNER from Coinkite, the operational mechanism is unique and completely different from typical hardware wallets, as this card does not provide a 12 or 24-word Seed Phrase (BIP-39) to write down on paper from the start!

If you are facing issues with changing your phone, forgetting your PIN, or planning for the potential loss of your card, this article will guide you through the recovery process for your TAPSIGNER wallet in every scenario, step-by-step.

🚨 Prudence & Safety Warning Before Recovery

⚠️ Most Important Security Conditions

TAPSIGNER has no PIN reset button on the card: If you forget the PIN, it cannot be cleared from the card. The only solution is using the Backup file + the recovery code on the back of the card.
The Backup Key (128-bit) on the back of the card is crucial: Changing the PIN used in the app does not change the decryption key for the backup on the back of the card. As long as you have this code along with the backup file, you can always recover your coins.
Recovery via Backup file immediately turns the wallet into a Hot Wallet: Once the backup file is decrypted in the Nunchuk app, the Master Private Key (xprv) is decrypted into the device's memory. It is recommended to immediately sweep all Bitcoin to a new wallet after successful recovery.
Backup data cannot be overwritten onto a new TAPSIGNER card: According to the TAPSIGNER FAQ, the Secure Element chip prevents the importing of external Private Keys into another card.

Step-by-Step Wallet Recovery Guide

Scenario 1: Changing devices or accidentally deleting the app (Still have the TAPSIGNER card and remember the PIN)

This is the easiest scenario. It requires no backup file and no recovery code from the back of the card, as the Private Key remains safely stored in the Secure Element chip on the original card.

You can proceed just as you would during the initial setup.

Step 1: Download and install the application

Download the Nunchuk Wallet app on your new smartphone (supports both iOS and Android with NFC).
Open the app; you can choose to use it as a Guest or log in to your existing account.

Step 2: Scan to add the TAPSIGNER key

Go to the Keys tab and press the `+` button.
Select Add NFC Key → Select Add TAPSIGNER.

Step 3: Tap the card and confirm the PIN

Place the TAPSIGNER card against the NFC antenna area on the back of your phone.
Once the app detects the card, enter the PIN (the one you set) and tap the card again to confirm.

Step 4: Restore the original wallet

Go to the Wallets tab → Press the `+` button.
Select Create a new wallet using existing keys → Select the TAPSIGNER key you just scanned.
The app will read the Public Key (xpub) from the card and retrieve your transaction history and total Bitcoin balance from the blockchain for immediate use.

Scenario 2: Card lost, damaged, or PIN forgotten (Recovery via Encrypted Backup)

Recovery in this case follows the TAPSIGNER Backup and Recovery Guide, where we use the backup file exported during setup along with the 128-bit recovery code.

Things to prepare

1. Encrypted Backup File: The file saved during setup (usually starts with backup-....bin or .aes).
2. Backup Password: The 128-bit numeric/alphanumeric code printed on the back of the TAPSIGNER card (which should have been stored separately upon purchase).

Step 1: Access the recovery menu on Nunchuk

Open the Nunchuk app, go to the Keys tab, and press the `+` button.
Select Add NFC Key.
Select Recover TAPSIGNER key from backup.

Step 2: Import file and decrypt

The system will open the File Explorer; select your saved Encrypted Backup file.
The app will prompt you for the password; enter the Backup Password (the one recorded from the back of the TAPSIGNER card) accurately.

Step 3: Create Software Key in the app

Once decryption is successful, the app will create a Software Key (Hot Key) on the device. Name the key as desired.

Go to the Wallets tab and create a wallet using the recovered key. All Bitcoin balance will appear.

Step 4: Sweep funds to a new wallet immediately (Crucial Step!)

Since the Master Private Key has been decrypted into the software on your phone, it is no longer 100% safe as Cold Storage.
It is highly recommended to prepare a new Hardware Wallet or new wallet address, and immediately Sweep/Send all Bitcoin to that new address.

Regarding forgetting the TAPSIGNER PIN: Important points to understand

Anti-Brute Force mechanism: The card allows 3 consecutive incorrect PIN attempts. If exceeded, the chip will enforce a delay (Rate Limit) of at least 15 seconds per attempt, preventing automated brute-force attacks.
2. PIN cannot be reset: The TAPSIGNER chip has no factory reset for the PIN for security reasons.
3. Recovery path: If you are certain the PIN is permanently forgotten, follow Scenario 3 below to decrypt your funds using the backup file.

For advanced users: How to recover Master Key (XPRV) using Offline OpenSSL

If you wish to extract the Master Private Key directly on an air-gapped computer, you can use the OpenSSL command as per the Nunchuk Documentation:

openssl aes-128-ctr -d -K <BACKUP_PASSWORD_HEX> -iv 0 -in <BACKUP_FILE> -out xprv.txt

Once executed, the xprv.txt file will contain the Extended Private Key (xprv...), which can be imported into wallets like Sparrow Wallet or Electrum for further transactions.

Summary Comparison Table of Recovery Scenarios

Comparison	1. New device / Reinstall app	2. Forgot PIN	3. Lost / Damaged card
Requirements	Physical card + Original PIN	Backup file + Back-of-card code	Backup file + Back-of-card code
Requires Backup file?	❌ No	✅ Yes	✅ Yes
Security status after recovery	🟢 High (Cold Key on card)	🟡 Becomes Hot Key on app	🟡 Becomes Hot Key on app
Can original card be reused?	✅ Yes	❌ No	❌ N/A
Recommendation after recovery	Use normally	Sweep funds to new wallet	Sweep funds to new wallet

TAPSIGNER Recovery Guide