Recently, I’ve been organizing my crypto asset security strategy and spent a lot of time researching cold wallet solutions on the market. This matter is more complex than I imagined, but I think it’s worth a good discussion.

Last year, cryptocurrency thefts occurred frequently, with data showing that over $3 billion was stolen throughout the year, mostly from wallet hacks and phishing attacks. This made me realize that for large assets, cold wallets are not optional but essential. The core logic of a cold wallet is simple: private keys are stored completely offline, so even if your computer is infected, hackers cannot access your coins.

I spent some time testing the main cold wallets available, combining third-party security audit reports and user feedback, and compiled a comparison ranking of cold wallets.

First, let’s talk about the top-tier OneKey Classic 1S. Its highlight is that it has passed a third-party audit by a professional security team, and the audit report is fully public. It uses bank-grade chips (CC EAL6+), and the firmware is 100% open source and verifiable. The price is also affordable—just over fifty dollars. Overall, this is the most cost-effective cold wallet I’ve tested.

Ledger Flex is the best-selling product worldwide, with the most mature ecosystem, supporting management of over 5,500 coins and NFTs. But it also has notable issues: it has experienced large-scale user data breaches in the past, and its firmware is closed source and cannot be audited. This is a pain point for users who value transparency.

Trezor Safe 5 is an industry veteran, having launched the world’s first hardware wallet back in 2014. It is also 100% open source, with chips rated at EAL6+, supporting over 9,000 coins. It has a larger screen and offers a good user experience. The downside is that it doesn’t have an native iOS app, and some popular coins require third-party wallets.

Tangem is the most portable solution, credit card-sized, with no battery and permanently usable. But it lacks a screen, so transaction details cannot be verified, making it suitable only for small asset backups.

From the perspective of cold wallet rankings, if your budget is limited but you want the best security, the OneKey Classic 1S is the top choice. If you need support for more coins and features, Ledger Flex is also good. Tech-savvy users might consider Trezor. For extreme portability needs, Tangem is worth trying.

Finally, I want to say that no matter which cold wallet you choose, the core principle remains the same: if you don’t hold the keys yourself, the assets don’t truly belong to you. This concept is never outdated in the crypto world.