The most secure Bitcoin hardware wallet with air-gapped design and open source firmware
The Coldcard Mk4 generates private keys using a cryptographically secure random number generator. Keys never leave the device and are protected by multiple layers of security.
Complete air-gap design means the device never connects to the internet or any network. This provides the highest level of physical security possible.
Open source firmware allows for community review and independent security audits. Regular updates address any discovered vulnerabilities.
Multiple recovery options ensure you can always access your Bitcoin while maintaining security. Supports various backup methods.
While highly secure, the Coldcard requires more technical knowledge than simpler wallets. The interface is functional but not as intuitive.
Completely open source design allows for full transparency and community verification of security claims.
Insert a microSD card and power on the device. Follow the on-screen prompts to generate a new wallet or restore from seed phrase.
Create multiple backups of your seed phrase and store them securely. Never store digital copies of your seed phrase.
Install compatible wallet software like Electrum or Sparrow to interact with your Coldcard.
Send a small test amount to verify everything is working correctly before storing larger amounts.
Yes, the Coldcard Mk4 is considered the most secure Bitcoin hardware wallet due to its air-gapped design, open source firmware, and advanced security features. It achieves a security score of 98/100 in our analysis.
Air-gapped means the device never connects to the internet or any network. This prevents remote attacks and ensures maximum security by physically isolating the device from potential threats.
While highly secure, the Coldcard Mk4 has a steep learning curve and is better suited for users with technical knowledge. Beginners might prefer simpler wallets like Trezor or Ledger.
No, the Coldcard Mk4 is Bitcoin-only. It focuses exclusively on Bitcoin to provide maximum security and simplicity for Bitcoin storage.
Firmware updates are done via microSD card. Download the latest firmware from the official website, copy it to a microSD card, and insert it into the device to update.
As long as you have your seed phrase backup, you can recover your Bitcoin on any compatible wallet. The Coldcard itself is just a tool to access your funds.