---
product_id: 559884140
title: "HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet"
brand: "imkey"
price: "S$83"
currency: SGD
in_stock: true
category: "Im Key"
url: https://www.desertcart.sg/products/559884140-heirbox-s1-crypto-seed-phrase-storage-metal-plate-backup-stainless
store_origin: SG
region: Singapore
---

# Fully waterproof & corrosion-proof Secure 6-screw locking system Fireproof up to 1398°C HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet

**Brand:** imkey
**Price:** S$83
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock your crypto legacy in fireproof steel—because your seed phrase deserves bulletproof security.

## Quick Answers

- **What is this?** HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet by imkey
- **How much does it cost?** S$83 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/559884140-heirbox-s1-crypto-seed-phrase-storage-metal-plate-backup-stainless)

## Best For

- imkey enthusiasts

## Why This Product

- Trusted imkey brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete DIY Kit:** Includes metal plates, screwdriver, screws & instructions for fast, foolproof setup.
- • **Dual-Sided Storage Power:** Store two separate 12-word seed phrases on one device—perfect for multi-wallet pros.
- • **Precision Laser Engraving:** Permanent, clear characters ensure flawless recovery with just the first 4 letters per word.
- • **Unbreakable Crypto Shield:** 304 stainless steel withstands extreme heat & water for ultimate seed phrase protection.
- • **Offline Cold Storage Security:** 100% offline design eliminates hacking risks, compatible with all BIP39 wallets.

## Overview

The imKey HeirBOX S1 is a premium stainless steel backup device designed to protect your BIP39 crypto seed phrases from fire, water, corrosion, and physical damage. Compatible with 12, 18, and 24-word phrases, it features laser-engraved characters, a secure 6-screw locking mechanism, and dual-sided storage for two wallets. Fully offline and compatible with major wallets like Ledger and Trezor, it offers a durable, tamper-proof cold storage solution for long-term crypto asset security.

## Description

Secure your crypto assets from fire, water, and time. The imKey HeirBOX S1 is a premium-grade metal backup device designed for the long-term protection of your BIP39 seed phrase. Made from 304 stainless steel, it offers extreme durability — fireproof up to 2000°C, fully waterproof, rust-resistant, and corrosion-proof. Your recovery phrase stays safe even in the most extreme environments. Compatible with 12, 18, and 24-word seed phrases, the HeirBOX S1 uses precision laser-engraved letter plates. Simply record the first four letters of each word, following the BIP39 standard. Works seamlessly with major wallets including Ledger, KeepKey, MetaMask, and Trust Wallet. Built with a 100% offline, non-electronic design, this device eliminates any risk of hacking or digital theft. The six-screw locking mechanism ensures the structure stays vibration-resistant and tamper-proof. Setup is fast and easy — all tools are included in the box. Whether you’re a long-term HODLer, a security-conscious investor, or looking for a durable cold storage backup, the imKey HeirBOX S1 provides peace of mind and uncompromising protection for your crypto recovery phrase. 📘 Why BIP39 and Why First Four Letters? BIP39 is a widely adopted standard that defines a fixed list of 2,048 unique English words used to generate and restore cryptocurrency wallets. Because every word in the list is uniquely identified by its first four letters, users only need to record those four letters for each word in their seed phrase — no need to engrave the entire word. This design makes storage faster, safer, and more discreet, without sacrificing compatibility or recovery accuracy. As long as your shortened mnemonic phrase is securely stored, you can restore your digital assets anytime using any BIP39-compatible wallet.

## Features

- Fireproof & Waterproof 304 Stainless Steel: Made of premium 304 stainless steel with 1398°C melting point — far above house fire temperature (~815°C). Fully protects your seed phrase from fire, water, corrosion, and impact.
- Foolproof Mistake-Proof Design: Fixed compartments with physical dividers separate every 4 letters. Tiles lock securely in place to prevent loss or errors, making backup and recovery simple and safe.
- Dual-Sided Storage for 2 Wallets: Store two separate 12-word seed phrases on Side A and B. Laser-engraved characters ensure permanent readability, secured with screws for extra protection.
- BIP39 Compatible & Easy Recovery: Supports 12/18/24-word phrases. Only the first 4 letters per word are needed for full recovery, saving space while ensuring 100% accuracy.
- Offline Cold Storage for all BIP 39 wallets: 100% offline and unhackable. Compatible with Ledger, Trezor, imKey Pro, imToken, MetaMask, Coinbase Wallet, and all BIP39-compliant wallets. The ultimate fireproof & waterproof cold storage backup for your Bitcoin, Ethereum, and other cryptocurrencies.
- Complete Kit, easy to Use: 1 x HeirBOX S1, 3 x metal letters plates, 1 x screwdriver, 6 x screws, 1 x instruction
- Customer service: If you need assistance or encounter any issues, please contact us at support@imkey.im.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BTM24566 |
| Best Sellers Rank | 471,110 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 948 in Cash & Check Boxes |
| Brand | imKey |
| Chamber Depth | 0.24 Inches |
| Colour | Silver |
| Control Type | Key Control |
| Customer Reviews | 4.6 4.6 out of 5 stars (118) |
| Included Components | 1 x HeirBOX S1, 3 x metal letters plates, 1 x screwdriver, 6 x screws, 1 x instruction |
| Item Dimensions D x W x H | 105D x 6W x 60H millimetres |
| Item Type Name | Cryptocurrency Seed Phrase Storage |
| Item Weight | 0.4 Pounds |
| Lock Type | Key |
| Manufacturer | IMKEY Co., Ltd |
| Material | Stainless Steel |
| Model Number | HeirBOX S1 |
| Mounting Type | Screw-mounted |
| Number of Items | 1 |
| Part Number | HeirBOX S1 |
| Special Features | Fireproof, Waterproof |
| Unit Count | 5.92 gram |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** imKey
- **Colour:** Silver
- **Included components:** 1 x HeirBOX S1, 3 x metal letters plates, 1 x screwdriver, 6 x screws, 1 x instruction
- **Item weight:** 0.4 Pounds
- **Lock type:** Key
- **Material:** Stainless Steel
- **Mounting type:** Screw-mounted
- **Product dimensions:** 105D x 6W x 60H millimetres
- **Special feature:** Fireproof, Waterproof
- **Water resistance level:** Waterproof

## Images

![HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet - Image 1](https://m.media-amazon.com/images/I/61aa4YCm0dL.jpg)
![HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet - Image 2](https://m.media-amazon.com/images/I/61Nyk9Wbi8L.jpg)
![HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet - Image 3](https://m.media-amazon.com/images/I/81K1jb+zFGL.jpg)
![HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet - Image 4](https://m.media-amazon.com/images/I/71URsOLMMsL.jpg)
![HeirBOX S1 Crypto Seed Phrase Storage Metal Plate Backup Stainless Steel Fireproof Waterproof for 12/18/24 Word BIP39 Mnemonic Recovery Phrase Compatible with Ledger Trezor Bitcoin Cold Wallet - Image 5](https://m.media-amazon.com/images/I/717HQfucRxL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: What should I pay attention to when installing the seed phrase into the backup box?**
A: Please install your recovery phrase away from others and cameras. Do not take photos. Do not read aloud. After installed, Store in a secure place, with a lock, to prevent others from viewing it.

**Q: Why I record only the first 4 letters of each mnemonic word? Is this safe?**
A: Yes — it’s safe. The BIP39 standard uses a list of 2048 words where no two words share the same first four characters, so the first 4 letters unambiguously identify each word. Wallets can complete the full word from those four letters.

**Q: Why not just write my seed phrase on paper?**
A: Paper can burn, tear, or be damaged by water. A metal backup provides stronger long-term protection.

**Q: How many mnemonic phrases can one HeirBOX S1 back up?**
A: The imKey S1 features a double-sided design and can store two sets of recovery phrases (Side A and Side B can each hold one 12-word recovery phrase). Each slot can store 4 letter tiles, which is sufficient to cover all BIP39 standard word lengths.

**Q: How should I install recovery phrase words that contain only three letters?**
A: Use a blank tile (included) for the fourth position. Three-letter words are already unique in the BIP39 list, so the blank simply completes the slot.

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-08-22*