Hardware wallets are physical devices designed to keep cryptocurrency private keys offline, reducing the risk that malware, phishing or remote attackers can steal them from an internet-connected phone or computer. But major incidents in 2026 have shown that cold storage is not automatically secure.
According to Decrypt, a firmware vulnerability affecting Coldcard devices and tampered Ledger wallets sold through a reseller resulted in substantial losses this year. The incidents have renewed attention on how hardware wallets work, how users should protect their recovery information and how manufacturers are adapting the technology for artificial intelligence and quantum-computing risks.
How hardware wallets protect crypto keys
A hardware wallet does not contain the coins themselves. Bitcoin, Ethereum and other cryptoassets remain recorded on their respective blockchains. The device stores the private keys that prove control of those assets and authorize transactions.
This differs from leaving funds on an exchange, where the platform generally controls the private keys. It also differs from a hot wallet, such as a browser extension or mobile application, whose keys are stored in software on an internet-connected device. Hardware wallets are considered cold storage because the keys remain offline.
When a device is set up, it generates private keys and provides a recovery seed phrase, usually consisting of 12 to 24 words. A user enters a PIN to protect access to the device. Anyone who obtains the seed phrase can recreate the wallet and take control of its funds, making the phrase a critical security responsibility.
To send cryptocurrency, the user normally prepares an unsigned transaction in companion software such as Ledger Wallet, Trezor Suite or Sparrow. The transaction is transferred to the hardware wallet, where the user checks the details and confirms the action. The device signs the transaction internally and sends back the signature, while the private key remains inside the wallet.
Devices may connect by USB, Bluetooth, NFC, QR code or microSD card. Some use secure elements, tamper-resistant chips similar to those used in passports and bank cards. Clear-signing features display transaction details in ordinary language rather than raw code, helping users identify what they are approving.
2026 incidents expose weak points
Hardware wallets are not hack-proof, and the failures reported this year involved more than the core idea of offline key storage.
In July, attackers exploited a five-year-old Coldcard firmware bug that weakened the randomness used to generate wallet seeds. TRM Labs estimated that about 1,816 BTC, worth approximately $116 million at the time, was taken from more than 5,200 addresses. Updating the firmware does not repair seeds that were already generated, so affected users must transfer their assets to newly created wallets.
A separate incident involved the distribution chain for Ledger devices. In October, Ledger said an unauthorized chip had been implanted in devices sold by Southeast Asian reseller CryptoBilis. The chip could read seed phrases as users entered them during setup and transmit them to an attacker. The investigation followed reports that roughly $86 million had been drained from Ledger users.
Ledger said its own Secure Element hardware had not been compromised, but the case showed how a reseller can become a security weakness. The company halted reseller distribution in seven Asian markets. European reseller MediaMarkt also stopped sales after reports of unauthorized implants, while Trezor ended its reseller program as a precaution.
Customer-data breaches at vendors and shipping partners present another risk. Even when no funds are directly stolen, exposed addresses and contact details can support phishing attempts or physical attacks in which criminals threaten holders. The source material notes that phishing and badly stored seed phrases remain larger risks for most users than a direct attack on the device.
From storage devices to broader self-custody platforms
The hardware-wallet industry is expanding beyond basic transaction signing. Ledger has added stablecoin yield through Kiln, Tangem has followed with Aave, and Trezor launched native stablecoin yield through Morpho vaults in 2026. Manufacturers are also developing products for users who want more than a small offline signing device.
Ledger’s Android-powered Atom, launched in October 2026, is designed around messaging, applications and agentic finance. The company increasingly describes its products as “signers” rather than hardware wallets. In June, it released Agent Stack, an open-source toolkit that allows artificial-intelligence agents to check balances and prepare transactions, while requiring a human to approve movement of funds on a Ledger device. The toolkit also extends hardware-based controls to institutional treasury teams through Ledger Enterprise.
Quantum computing is another focus. Manufacturers are considering whether future machines could break cryptography used by crypto wallets. Trezor’s Safe 7, launched in late 2025, uses a post-quantum signature scheme for bootloader verification and is designed to receive quantum-resistant updates without requiring users to move their keys to another device. The issue gained further attention after Vitalik Buterin and Justin Drake warned in October 2026 that artificial intelligence could break crypto encryption before quantum computers do.
The sector has also faced commercial pressure. Ledger put a potential U.S. initial public offering, reportedly considered at a valuation of about $4 billion, on hold in May 2026 because of weak market conditions. Against that backdrop, the Coldcard and CryptoBilis incidents underline that hardware is only one part of a self-custody setup. Buying directly from a manufacturer, avoiding second-hand devices and protecting the seed phrase remain central safeguards.
Current crypto market picture
Moneyiar market data at 21:54 on October 17, 2026, showed Bitcoin at $81,061.98, down 0.65% over 24 hours and 2.31% over seven days. Ethereum was $2,377.85, down 1.54% in 24 hours and 5.16% over seven days.
Shiba Inu stood at $0.0000049298, down 3.04% over 24 hours and 9.68% over seven days. Uniswap traded at $7.11, down 1.78% over 24 hours and 7.06% over seven days.
