A hardware wallet is designed to keep private keys away from an internet-connected computer or smartphone. That makes it one of the strongest tools for self-custody. But physical possession of the device is only one part of the security model. A wallet can remain locked in a safe and a user can still lose cryptocurrency if another part of the system fails.
Recent events in 2026 made this point especially clear. In July, Coldcard manufacturer Coinkite disclosed a firmware problem that weakened the generation of some seed phrases. Attackers did not need to steal or remotely access the devices. Instead, they were able to reconstruct vulnerable keys offline. The incident showed why protecting the device itself is not enough.
The Device Is Not the Same as the Wallet
A hardware wallet does not literally contain coins. Cryptocurrency remains recorded on the blockchain. The device protects the private keys that allow the owner to authorize transactions.
This distinction matters because access can sometimes be recreated without the original device. A seed phrase is designed for exactly that purpose: if the hardware wallet is lost or damaged, the owner can restore the wallet on a compatible device. The same recovery mechanism becomes a risk if the seed phrase is exposed or was generated insecurely.
What Happened with Coldcard in 2026?
Coldcard’s 2026 security incident is an unusual but useful example. Coinkite reported that a firmware bug affected the way some devices generated wallet seeds. The resulting seeds did not always have the level of randomness users expected.
This meant an attacker could search through a much smaller set of possible seeds on their own equipment, identify matching blockchain addresses and reconstruct the corresponding private keys. The victim’s hardware wallet did not need to be connected to the internet, remotely controlled or physically stolen.
Coinkite released corrected firmware and told affected users to move their funds to wallets created with new seeds. Importantly, simply updating the device was not enough to repair an old vulnerable seed. That seed had already been created and remained potentially exposed.
A Seed Backup Can Be a Bigger Risk Than the Device
In more typical cases, the weak point is not firmware but the backup. Users often protect the hardware wallet carefully while storing the recovery phrase in a photo, cloud note, email draft or messenger. If someone gets access to that copy, they may be able to restore the wallet elsewhere without touching the original device.
Millpay specialists recommend treating the seed phrase as a separate security asset rather than simply as a backup for the device. It should be kept offline, protected from unauthorized access and never entered into a website or application unless the owner is deliberately restoring a wallet through trusted software.
Malware Can Still Influence a Transaction
A hardware wallet also cannot make every transaction decision for its owner. Malware on a computer may try to replace a recipient address or display misleading information before a transaction reaches the wallet for approval.
This is why the screen on the hardware device matters. Before approving a payment, users should compare the recipient address and amount shown on the wallet itself with the intended transaction. If the information is different, the transaction should not be signed.
Fake Updates and Support Messages Remain a Risk
Another common route does not require technical exploitation at all. A user may receive a fake security alert telling them to install an urgent update, restore a wallet or enter a seed phrase. The message may use the name and branding of a real hardware wallet manufacturer.
A legitimate firmware update should be obtained through the manufacturer’s official channels. A support representative should not need a recovery phrase to diagnose a device. Millpay experts also advise users to avoid acting under artificial time pressure: warnings that funds will disappear unless something is done immediately are a common social-engineering tactic.
How to Reduce the Risk
- Keep the seed phrase offline and separate from the hardware wallet.
- Install firmware only from the manufacturer’s official source and review security notices for the device you use.
- Check the recipient address and amount on the hardware wallet screen before approving a transaction.
- Do not enter a recovery phrase after following a link from an email, messenger or social network.
- If a manufacturer announces that previously generated seeds may be unsafe, follow the migration instructions rather than assuming a firmware update alone solves the problem.
Hardware Wallets Are Still Useful — but They Are Not Magic
The Coldcard incident does not mean hardware wallets are inherently unsafe. They remain an important way to isolate private keys and reduce exposure to many common online attacks. The lesson is that security depends on more than possession of a physical device.
The seed-generation process, recovery backup, firmware source, computer used to prepare transactions and the owner’s own decisions all matter. A hardware wallet can be an excellent security layer, but only when the rest of the process is protected as carefully as the device itself.
