Keystone Tablet Punch
A stainless steel backup for your recovery phrase. Keystone Tablet Punch is built for one job: preserve your BIP39 seed phrase in steel so it survives the kinds of events paper does not. It uses an automatic centre punch to mark characters into 304-grade stainless steel plates then locks closed for long-term storage.
Why people buy it
- Fire resistant by design: Keystone lists a fireproof threshold of 1399 to 1455°C. Typical house fires peak around 649°C. This is built to outlast that scenario.
- Waterproof plus corrosion resistance: the unit is made entirely from 304 stainless steel and is designed for long-term exposure risks like moisture and humidity.
- Punch marking: you permanently mark the steel using the included automatic centre punch. No ink. No labels. No fading.
- BIP39 friendly layout: it is designed around recording the first 4 letters of each seed word which is enough to uniquely identify BIP39 words, including words that are only 3 letters.
- Lockable enclosure: three shackle holes let you secure the plates closed with a small padlock (not included).
Source: Keystone official product details. [oai_citation:0‡Keystone](https://shop.keyst.one/products/keystone-tablet-punch?utm_source=chatgpt.com)
How it works
- Confirm your seed phrase is correct before you record anything.
- For each word, punch the first 4 letters (or 3 where applicable) into the correct word position.
- Double-check spelling against the BIP39 word list using your wallet software or a trusted reference.
- Close the plates, add a padlock if you want, and store it somewhere secure and dry.
Keystone states the first 4 letters uniquely identify BIP39 words. [oai_citation:1‡Keystone](https://shop.keyst.one/products/keystone-tablet-punch?utm_source=chatgpt.com)
What’s in the box
- 3 steel plates
- Front cover plate (one-sided, words 1 to 6)
- Middle cover plate (two-sided, words 7 to 18)
- Back cover plate (one-sided, words 19 to 24)
- Automatic centre punch
Source: Keystone official product details. [oai_citation:2‡Keystone](https://shop.keyst.one/products/keystone-tablet-punch?utm_source=chatgpt.com)
Independent review note
If you care about stress testing, Jameson Lopp’s metal seed storage review found the punch marks stayed readable after heat testing, although the plates showed more “noise” around the markings. His corrosion stress test was harsh on this specific product, with many markings becoming difficult to distinguish after the test. That is worth knowing if you plan to store it in humid or coastal environments.
Source: Metal Bitcoin Storage Reviews by Jameson Lopp. [oai_citation:3‡jlopp.github.io](https://jlopp.github.io/metal-bitcoin-storage-reviews/reviews/keystone-tablet-punch/?utm_source=chatgpt.com)
Practical storage tips
- Store it dry. Add desiccant. Avoid long-term exposure to salty air or damp safes.
- Keep a second backup in a separate location. Redundancy beats regret.
- Never photograph your seed phrase or type it into websites, forms, or messages.
Important
Your recovery phrase is the master key. Anyone who sees it can take your bitcoin. Treat this as a critical security item, not a gadget.
