I lost a paper seed phrase backup once. Not to hackers or thieves—to a leaky pipe in my closet. The ink ran, the paper dissolved, and I spent three hours in a cold sweat recovering funds from a secondary backup I'd almost forgotten about. That experience convinced me: paper is not a long-term solution.
So I've been testing metal seed storage options, and the OneKey KeyTag has been sitting on my desk for the past month. Here's what I found.
What Is the KeyTag and Why Does It Exist?
The KeyTag is OneKey's answer to a simple problem: your 24-word seed phrase is the master key to your crypto. Lose it, and you lose everything. Store it wrong, and you're one house fire, flood, or curious family member away from disaster.
The KeyTag is a set of titanium plates designed to store your recovery words permanently. You punch letters into the metal using the included tools, creating a backup that can survive conditions that would destroy paper, laminated cards, or even most steel products.
The core specs:
- Material: TC4 titanium alloy (Grade 5, same as aerospace and medical implants)
- Melting point: 1,668°C (3,034°F)—well above typical house fire temperatures of 600-800°C
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