Description
Coinplate Alpha is a premium stainless steel seed phrase backup solution designed for long-term cold storage of your cryptocurrency recovery phrase. Built from two 5mm thick AISI 304 (German Stainless Steel) plates bolted together, it forms a 10mm thick steel sandwich weighing 1.1kg (2.5lb).
Extreme Durability
- Fireproof up to 1,300°C / 2,400°F — Far exceeds house fire temperatures (850°C / 1,500°F).
- Waterproof — Sealed design with no gap for water ingress.
- Corrosion & Rust Resistant — AISI 304 stainless steel withstands environmental degradation.
- Impact Resistant — 10mm thick steel sandwich protects against crushing and physical trauma.
- Top Rated in Stress Tests — Received a stellar Triple-A rating in Jameson Lopp's extreme stress tests (2000°F blow torch, 12h acid bath, 20-ton hydraulic press).
Easy Setup
The Alpha comes with an automatic center punch tool — no hammer, drill, or special equipment needed. Simply mark the first 4 letters of each BIP39 seed word into the deep-engraved layout. The markings create visible dents in the metal that remain readable even after extreme conditions.
Capacity & Compatibility
- Up to 24 Seed Words — Supports 12, 18, and 24-word BIP39 seed phrases.
- SLIP39 Compatible — Also works with Shamir Backup (20-word seed phrases).
- Universal Wallet Support — Compatible with all BIP39 hardware wallets (Ledger, Trezor, Keystone) and software wallets (MetaMask, MyEtherWallet, and more).
Additional Security Features
- Tamper-Evident Seals — Included seals let you verify no one has accessed your data.
- Discreet Design — Plain, logo-free packaging with a removable brand sticker on the product.
- Hidden Data — Seed phrase sits inside the steel sandwich, not visible at first glance.
What's Included
- Coinplate Alpha stainless steel plates (top and bottom)
- Automatic center punch tool
- Stainless steel bolts
- Tamper-evident seals
- Setup instructions
Highlights
Pros
- Automatic center punch system requires no hammer or hard work surface — quieter and delivers more consistent strikes than manual stamping
- Pre-printed grid with deep-engraved lettering guides accurate punch placement and makes the seed phrase easy to read back
- Fireproof up to 1,300°C / 2,400°F — well above the 850°C / 1,500°F reached in typical house fires
- Earned a perfect Triple A rating (A/A/A/A) in Jameson Lopp's extreme stress tests for heat, corrosion, and crush resistance
- Two 5mm AISI 304 stainless steel plates form a 10mm thick steel sandwich, providing exceptional structural integrity against crushing and impact
Cons
- Punch marks are permanent — if you stamp the wrong letter there is no way to undo or correct the mistake
- Screws can seize up after extreme heat exposure due to metal expansion, potentially requiring power tools to open the device
- Stainless steel offers lower heat resistance than titanium alternatives like CryptoTag Zeus or Loki
- Smooth center punch holes can be difficult to photograph clearly, though they are easily visible to the naked eye
- Extremely heavy — each plate weighs over a pound and the assembled unit weighs nearly 3 pounds, limiting portability